feat: add custom nbgitpuller

Dockerfile

@@ -18,10 +18,6 @@ RUN apt-get update \
         iputils-ping \
   && rm -rf /var/lib/apt/lists/*
 
-# Install language packs
-RUN pip install --upgrade pip \
-  && pip install jupyterlab-language-pack-zh-CN
-
 # Install Java
 # Install dependencies
 RUN apt-get update \
@@ -72,12 +68,22 @@ RUN pip install --no-cache-dir jupyter-c-kernel/ \
 # Cleanup
 RUN rm -rf jupyter-c-kernel/
 
+# 3.1.9 <= 3.1.6
+# RUN pip install --upgrade jupyterlab
+
+# Install language packs
+RUN pip install --no-cache-dir pip install jupyterlab-language-pack-zh-CN==0.0.2.dev0
+
 USER $NB_USER
 
 COPY requirements.txt /tmp/requirements.txt
 RUN python -m pip install --no-cache-dir \
     -r /tmp/requirements.txt
 
+COPY nbgitpuller/ /tmp/nbgitpuller/
+RUN python -m pip install --no-cache-dir /tmp/nbgitpuller
+# RUN python -m pip install --no-cache-dir git+https://codechina.csdn.net/codechina_dev/nbgitpuller.git@develop
+
 # Support overriding a package or two through passed docker --build-args.
 # ARG PIP_OVERRIDES="jupyterhub==1.3.0"
 ARG PIP_OVERRIDES=
@@ -89,5 +95,6 @@ RUN jupyter serverextension enable --py nbgitpuller --sys-prefix
 
 # Uncomment the line below to make nbgitpuller default to start up in JupyterLab
 ENV NBGITPULLER_APP=lab
+ENV NBGITPULLER_PARENTPATH=tmp
 
 # conda/pip/apt install additional packages here, if desired.

nbgitpuller/.circleci/config.yml

+version: 2.1
+jobs:
+  build_docs:
+    docker:
+      - image: circleci/python:3.6-stretch
+    steps:
+      - build_site
+      - store_artifacts:
+          path: docs/_build/html/
+          destination: html
+
+  push_docs:
+    docker:
+      - image: circleci/python:3.6-stretch
+    steps:
+      # Add deployment key fingerprint for CircleCI to use for a push
+      - add_ssh_keys:
+          fingerprints:
+            # The SSH key fingerprint
+            - "c5:70:b9:1b:9a:cf:e3:88:25:9f:33:8e:ee:09:76:9f"
+
+      - build_site
+
+      - run:
+          name: Pushing documentation to gh-pages
+          command: |
+            pip install --user ghp-import
+            ghp-import --no-jekyll --push --message "Update documentation [skip ci]" docs/_build/html
+
+workflows:
+  version: 2
+  default:
+    jobs:
+      - build_docs
+      - push_docs:
+          filters:  # using regex filters requires the entire branch to match
+            branches:
+              only:  # only branches matching the below regex filters will run
+                - main
+
+commands:
+  build_site:
+    description: "Build the site with sphinx"
+    steps:
+      # Get our data and merge with upstream
+      - run: sudo apt-get update
+      - checkout
+      # Python env
+      - run: echo "export PATH=~/.local/bin:$PATH" >> $BASH_ENV
+
+      - restore_cache:
+          keys:
+            - cache-pip
+      - run: pip install --user -r docs/doc-requirements.txt
+      - save_cache:
+          key: cache-pip
+          paths:
+            - ~/.cache/pip
+
+      # Build the docs
+      - run:
+          name: Build docs to store
+          command: |
+            cd docs
+            make html

nbgitpuller/.flake8

+[flake8]
+# Ignore style and complexity
+# E: style errors
+# W: style warnings
+# C: complexity
+# E402: module level import not at top of file
+# I100: Import statements are in the wrong order
+# I101: Imported names are in the wrong order. Should be
+ignore = E, C, W, E402, I100, I101, D400
+exclude =
+    .cache,
+    .github

nbgitpuller/.github/workflows/publish.yml

+# Build releases and (on tags) publish to PyPI
+name: Release
+
+# always build releases (to make sure wheel-building works)
+# but only publish to PyPI on tags
+on:
+  push:
+  pull_request:
+
+jobs:
+  build-release:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: 3.8
+
+      - name: install build package
+        run: |
+          pip install --upgrade pip
+          pip install build
+          pip freeze
+
+      - name: build release
+        run: |
+          python -m build --sdist --wheel .
+          ls -l dist
+
+      - name: publish to pypi
+        uses: pypa/gh-action-pypi-publish@v1.4.1
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          user: __token__
+          password: ${{ secrets.pypi_password }}

nbgitpuller/.github/workflows/test.yml

+# This is a GitHub workflow defining a set of jobs with a set of steps.
+# ref: https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-syntax-for-github-actions
+#
+name: Tests
+
+on:
+  pull_request:
+  push:
+  workflow_dispatch:
+
+jobs:
+  test:
+
+    runs-on: ubuntu-20.04
+    timeout-minutes: 10
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Run webpack to build static assets
+        run: |
+            npm install
+            npm run webpack
+
+      - name: Install Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.8'
+
+      # DISABLED: Since we don't pin our dependencies in dev-requirements.txt
+      #           and only refresh the cache when it changes, we end up with a
+      #           cache that remains for too long and cause failures. Due to
+      #           this, it has been disabled.
+      #
+      # - name: Cache pip dependencies
+      #   uses: actions/cache@v2
+      #   with:
+      #     path: ~/.cache/pip
+      #     # Look to see if there is a cache hit for the corresponding requirements file
+      #     key: ${{ runner.os }}-pip-${{ hashFiles('*requirements.txt') }}
+      #     restore-keys: |
+      #       ${{ runner.os }}-pip-
+
+      - name: Install dependencies
+        run: |
+          pip install -r dev-requirements.txt
+
+      - name: Run flake8 linter
+        run: flake8
+
+      - name: Run tests
+        run: |
+          pip install .
+          pytest --verbose --maxfail=2 --color=yes --cov nbgitpuller

nbgitpuller/.gitignore

+*.pyc
+
+dist/
+build/
+*.egg-info/
+
+.tox/
+.coverage
+
+.DS_Store
+.cache/
+data8assets/
+.autopull_list
+summer/
+test-repo/
+venv/
+
+.ipynb_checkpoints
+docs/_build
+
+node_modules/
+package-lock.json
+
+nbgitpuller/static/dist
\ No newline at end of file

nbgitpuller/CHANGELOG.md

+## 0.10
+
+### 0.10.2 - 2021-08-25
+
+This is a critical security release, please upgrade to this and see [GHSA-mq5p-2mcr-m52j](https://github.com/jupyterhub/nbgitpuller/security/advisories/GHSA-mq5p-2mcr-m52j) more information.
+
+### 0.10.1 - 2021-06-24
+
+#### Bugs fixed
+
+- Added branch name back to command-line usage [#185](https://github.com/jupyterhub/nbgitpuller/pull/185) ([@sean-morris](https://github.com/sean-morris))
+
+#### Documentation improvements
+
+- Provide cleaner feedback for lint vs test failures [#181](https://github.com/jupyterhub/nbgitpuller/pull/181) ([@yuvipanda](https://github.com/yuvipanda))
+
+#### Continuous integration
+
+- Fix CI failures by disabling pip cache [#188](https://github.com/jupyterhub/nbgitpuller/pull/188) ([@consideRatio](https://github.com/consideRatio))
+
+#### Contributors to this release
+
+([GitHub contributors page for this release](https://github.com/jupyterhub/nbgitpuller/graphs/contributors?from=2021-06-09&to=2021-06-24&type=c))
+
+[@consideRatio](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3AconsideRatio+updated%3A2021-06-09..2021-06-24&type=Issues) | [@manics](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3Amanics+updated%3A2021-06-09..2021-06-24&type=Issues) | [@sean-morris](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3Asean-morris+updated%3A2021-06-09..2021-06-24&type=Issues) | [@yuvipanda](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3Ayuvipanda+updated%3A2021-06-09..2021-06-24&type=Issues)
+
+### 0.10.0 - 2021-06-09
+
+#### Enhancements made
+
+- UI: Branch input placeholder no longer suggests master branch [#180](https://github.com/jupyterhub/nbgitpuller/pull/180) ([@sean-morris](https://github.com/sean-morris))
+- Automatically detect default branch name [#179](https://github.com/jupyterhub/nbgitpuller/pull/179) ([@sean-morris](https://github.com/sean-morris))
+- Tell users about `main` vs `master` branches [#170](https://github.com/jupyterhub/nbgitpuller/pull/170) ([@yuvipanda](https://github.com/yuvipanda))
+- Support generating shiny links [#165](https://github.com/jupyterhub/nbgitpuller/pull/165) ([@yuvipanda](https://github.com/yuvipanda))
+
+#### Bugs fixed
+
+- Handle lack of trailing slashes in hub URLs [#173](https://github.com/jupyterhub/nbgitpuller/pull/173) ([@yuvipanda](https://github.com/yuvipanda))
+- Respect path component of JupyterHub url [#172](https://github.com/jupyterhub/nbgitpuller/pull/172) ([@yuvipanda](https://github.com/yuvipanda))
+- Parse ssh git URLs properly [#163](https://github.com/jupyterhub/nbgitpuller/pull/163) ([@yuvipanda](https://github.com/yuvipanda))
+- Fix failure to restore deleted files (use raw output of git ls-files to avoid quoting unicode) [#156](https://github.com/jupyterhub/nbgitpuller/pull/156) ([@manics](https://github.com/manics))
+- Compare current branch to target - don't assume already on target branch locally [#141](https://github.com/jupyterhub/nbgitpuller/pull/141) ([@danlester](https://github.com/danlester))
+
+#### Documentation improvements
+
+- Document restarting notebook process to see changes [#178](https://github.com/jupyterhub/nbgitpuller/pull/178) ([@yuvipanda](https://github.com/yuvipanda))
+- docs: update README.md badges [#175](https://github.com/jupyterhub/nbgitpuller/pull/175) ([@consideRatio](https://github.com/consideRatio))
+- Add best practices recommendation documentation [#169](https://github.com/jupyterhub/nbgitpuller/pull/169) ([@yuvipanda](https://github.com/yuvipanda))
+- Document how to do local development [#162](https://github.com/jupyterhub/nbgitpuller/pull/162) ([@yuvipanda](https://github.com/yuvipanda))
+- Add badges to README.md [#150](https://github.com/jupyterhub/nbgitpuller/pull/150) ([@consideRatio](https://github.com/consideRatio))
+
+#### Continuous Integration
+
+- CI: Replace Travis with GitHub workflow [#161](https://github.com/jupyterhub/nbgitpuller/pull/161) ([@manics](https://github.com/manics))
+- CI: stop triggering CircleCI on automated pushes to gh-pages [#151](https://github.com/jupyterhub/nbgitpuller/pull/151) ([@consideRatio](https://github.com/consideRatio))
+
+#### Contributors to this release
+
+([GitHub contributors page for this release](https://github.com/jupyterhub/nbgitpuller/graphs/contributors?from=2020-08-01&to=2021-06-09&type=c))
+
+[@albertmichaelj](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3Aalbertmichaelj+updated%3A2020-08-01..2021-06-09&type=Issues) | [@choldgraf](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3Acholdgraf+updated%3A2020-08-01..2021-06-09&type=Issues) | [@consideRatio](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3AconsideRatio+updated%3A2020-08-01..2021-06-09&type=Issues) | [@danlester](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3Adanlester+updated%3A2020-08-01..2021-06-09&type=Issues) | [@giumas](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3Agiumas+updated%3A2020-08-01..2021-06-09&type=Issues) | [@manics](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3Amanics+updated%3A2020-08-01..2021-06-09&type=Issues) | [@minrk](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3Aminrk+updated%3A2020-08-01..2021-06-09&type=Issues) | [@ryanlovett](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3Aryanlovett+updated%3A2020-08-01..2021-06-09&type=Issues) | [@SaladRaider](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3ASaladRaider+updated%3A2020-08-01..2021-06-09&type=Issues) | [@samuelmanzer](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3Asamuelmanzer+updated%3A2020-08-01..2021-06-09&type=Issues) | [@sean-morris](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3Asean-morris+updated%3A2020-08-01..2021-06-09&type=Issues) | [@ttimbers](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3Attimbers+updated%3A2020-08-01..2021-06-09&type=Issues) | [@welcome](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3Awelcome+updated%3A2020-08-01..2021-06-09&type=Issues) | [@yuvipanda](https://github.com/search?q=repo%3Ajupyterhub%2Fnbgitpuller+involves%3Ayuvipanda+updated%3A2020-08-01..2021-06-09&type=Issues)
+
+## 0.9
+
+### 0.9.0 - 2020-09-1
+
+- Allow destination to be configured ([#42](https://github.com/jupyterhub/nbgitpuller/pull/42))
+- Made the checkout from the reset_deleted_files to use the origin. ([#111](https://github.com/jupyterhub/nbgitpuller/pull/111))
+- Update version. ([#112](https://github.com/jupyterhub/nbgitpuller/pull/112))
+- Update index.rst ([#113](https://github.com/jupyterhub/nbgitpuller/pull/113))
+- Use shallow clones by default ([#117](https://github.com/jupyterhub/nbgitpuller/pull/117))
+- updating theme ([#126](https://github.com/jupyterhub/nbgitpuller/pull/126))
+- Update ipynb with newer query parameters and toggles ([#127](https://github.com/jupyterhub/nbgitpuller/pull/127))
+- Add a mybinder.org tab to the link builder ([#129](https://github.com/jupyterhub/nbgitpuller/pull/129))
+- tab activation on link generator ([#132](https://github.com/jupyterhub/nbgitpuller/pull/132))
+- fixing bug ([#134](https://github.com/jupyterhub/nbgitpuller/pull/134))
+- Fix typo from ipynb link generator external tool reference  ([#136](https://github.com/jupyterhub/nbgitpuller/pull/136))
+- Use the correct branch for contentRepo ([#138](https://github.com/jupyterhub/nbgitpuller/pull/138))
+- Fix file paths or application paths ([#140](https://github.com/jupyterhub/nbgitpuller/pull/140))
+- Make the environment repo branch required for binder ([#143](https://github.com/jupyterhub/nbgitpuller/pull/143))
+- Travis pypi deployment, README fixes ([#145](https://github.com/jupyterhub/nbgitpuller/pull/145))
+- Replace data-8 with jupyterhub ([#146](https://github.com/jupyterhub/nbgitpuller/pull/146))
+- CI: fix broken test assertions following --depth 1 by default ([#147](https://github.com/jupyterhub/nbgitpuller/pull/147))
+- CI: ensure tox run's flake8 as well ([#148](https://github.com/jupyterhub/nbgitpuller/pull/148))
+
+## 0.8
+
+### 0.8.0 2019-11-23
+
+- Link generator: init application type from query params ([#107](https://github.com/jupyterhub/nbgitpuller/pull/107))
+- Made the checkout from the reset_deleted_files to use the origin. ([#111](https://github.com/jupyterhub/nbgitpuller/pull/111))
+
+## 0.7
+
+### 0.7.2 - 2019-10-3
+
+- Bump version number ([#103](https://github.com/jupyterhub/nbgitpuller/pull/103))
+- Set authorship info on each commit, rather than repo-wide ([#104](https://github.com/jupyterhub/nbgitpuller/pull/104))
+- Bump version number ([#105](https://github.com/jupyterhub/nbgitpuller/pull/105))
+
+### 0.7.1 2019-10-3
+
+- Update version to 0.7.0. ([#100](https://github.com/jupyterhub/nbgitpuller/pull/100))
+- Fix legacy links with empty path ([#102](https://github.com/jupyterhub/nbgitpuller/pull/102))
+- Bump version number ([#103](https://github.com/jupyterhub/nbgitpuller/pull/103))
+
+### 0.7.0 2019-07-31
+
+- adding a link generator binder ([#49](https://github.com/jupyterhub/nbgitpuller/pull/49))
+- Clean up link_generator notebook / app ([#50](https://github.com/jupyterhub/nbgitpuller/pull/50))
+- add link to TLJH guide in readme ([#52](https://github.com/jupyterhub/nbgitpuller/pull/52))
+- updating link sanitizing ([#54](https://github.com/jupyterhub/nbgitpuller/pull/54))
+- adds link to a basic video instruction ([#56](https://github.com/jupyterhub/nbgitpuller/pull/56))
+- Add new link generator instructions ([#62](https://github.com/jupyterhub/nbgitpuller/pull/62))
+- adding new nbgitpuller link gen app ([#63](https://github.com/jupyterhub/nbgitpuller/pull/63))
+- Implement depth/shallow-clone support ([#67](https://github.com/jupyterhub/nbgitpuller/pull/67))
+- Made repo_dir an absolute path based on the server_root_dir. ([#71](https://github.com/jupyterhub/nbgitpuller/pull/71))
+- Serve gh pages from docs/ not gh-pages ([#73](https://github.com/jupyterhub/nbgitpuller/pull/73))
+- Pass nbapp along to GitPuller so it can read from our configuration ([#75](https://github.com/jupyterhub/nbgitpuller/pull/75))
+- Rework nbgitpuller link generator ([#76](https://github.com/jupyterhub/nbgitpuller/pull/76))
+- Generate URLs that can be launched from canvas ([#78](https://github.com/jupyterhub/nbgitpuller/pull/78))
+- Don't require including cloned dir name in path to open ([#79](https://github.com/jupyterhub/nbgitpuller/pull/79))
+- adding documentation ([#81](https://github.com/jupyterhub/nbgitpuller/pull/81))
+- circle config to push docs ([#82](https://github.com/jupyterhub/nbgitpuller/pull/82))
+- documentation clarification ([#88](https://github.com/jupyterhub/nbgitpuller/pull/88))
+- Redo documentation ([#92](https://github.com/jupyterhub/nbgitpuller/pull/92))
+- Allow git@example.com:repo links ([#97](https://github.com/jupyterhub/nbgitpuller/pull/97))
+
+## 0.6
+
+### 0.6.1 2018-07-19
+
+- Install Jupyter notebook extension by default, Add missing nbgitpuller.json file
+
+### 0.6.0 2018-07-18
+
+- Work with (and require) newer notebook version ([#46](https://github.com/jupyterhub/nbgitpuller/pull/46))
+- Update README.md ([#48](https://github.com/jupyterhub/nbgitpuller/pull/48))

nbgitpuller/LICENSE

+BSD 3-Clause License
+
+Copyright (c) 2017, YuviPanda, Peter Veerman
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the copyright holder nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

nbgitpuller/MANIFEST.in

+include *.md
+include LICENSE
+include setup.cfg
+recursive-include nbgitpuller/static *
+recursive-include nbgitpuller/templates *

nbgitpuller/README.md

+# [nbgitpuller](https://github.com/jupyterhub/nbgitpuller)
+
+
+[![GitHub Workflow Status - Test](https://img.shields.io/github/workflow/status/jupyterhub/nbgitpuller/Tests?logo=github&label=tests)](https://github.com/jupyterhub/nbgitpuller/actions)
+[![CircleCI build status](https://img.shields.io/circleci/build/github/jupyterhub/nbgitpuller?logo=circleci&label=docs)](https://circleci.com/gh/jupyterhub/nbgitpuller)
+[![](https://img.shields.io/pypi/v/nbgitpuller.svg?logo=pypi)](https://pypi.python.org/pypi/nbgitpuller)
+[![GitHub](https://img.shields.io/badge/issue_tracking-github-blue?logo=github)](https://github.com/jupyterhub/nbgitpuller/issues)
+[![Discourse](https://img.shields.io/badge/help_forum-discourse-blue?logo=discourse)](https://discourse.jupyter.org/c/jupyterhub)
+[![Gitter](https://img.shields.io/badge/social_chat-gitter-blue?logo=gitter)](https://gitter.im/jupyterhub/jupyterhub)
+
+`nbgitpuller` lets you distribute content in a git repository to your students
+by having them click a simple link. [Automatic
+merging](https://jupyterhub.github.io/nbgitpuller/topic/automatic-merging.html)
+ensures that your students are never exposed to `git` directly. It is primarily
+used with a JupyterHub, but can also work on students' local computers.
+
+See [the documentation](https://jupyterhub.github.io/nbgitpuller) for more
+information.
+
+## Installation
+
+```shell
+pip install nbgitpuller
+```
+
+## Example
+
+![](https://raw.githubusercontent.com/jupyterhub/nbgitpuller/v0.8.0/docs/_static/nbpuller.gif)

nbgitpuller/RELEASE.md

+# How to make a release
+
+`nbgitpuller` is a package available on
+[PyPI](https://pypi.org/project/nbgitpuller/) and
+[conda-forge](https://anaconda.org/conda-forge/nbgitpuller).
+These are instructions on how to make a release on PyPI.
+The PyPI release is done automatically by TravisCI when a tag is pushed.
+
+
+## Steps to make a release
+
+1. Checkout main and make sure it is up to date.
+
+   ```shell
+   ORIGIN=${ORIGIN:-origin} # set to the canonical remote, e.g. 'upstream' if 'origin' is not the official repo
+   git checkout main
+   git fetch $ORIGIN main
+   git reset --hard $ORIGIN/main
+   # WARNING! This next command deletes any untracked files in the repo
+   git clean -xfd
+   ```
+
+1. Set the `__version__` variable in
+   [`nbgitpuller/version.py`](nbgitpuller/version.py)
+   and make a commit.
+
+   ```
+   git add nbgitpuller/version.py
+   VERSION=...  # e.g. 1.2.3
+   git commit -m "release $VERSION"
+   ```
+
+1. Reset the `__version__` variable in
+   [`nbgitpuller/version.py`](nbgitpuller/version.py)
+   to an incremented patch version with a `dev` element, then make a commit.
+   ```
+   git add nbgitpuller/version.py
+   git commit -m "back to dev"
+   ```
+
+1. Push your two commits to main.
+
+   ```shell
+   # first push commits without a tags to ensure the
+   # commits comes through, because a tag can otherwise
+   # be pushed all alone without company of rejected
+   # commits, and we want have our tagged release coupled
+   # with a specific commit in main
+   git push $ORIGIN main
+   ```
+
+1. Create a git tag for the pushed release commit and push it.
+
+   ```shell
+   git tag -a $VERSION -m $VERSION HEAD~1
+
+   # then verify you tagged the right commit
+   git log
+
+   # then push it
+   git push $ORIGIN refs/tags/$VERSION
+   ```
+
+1. Following the release to PyPI, an automated PR should arrive to
+   [conda-forge/nbgitpuller-feedstock](https://github.com/conda-forge/nbgitpuller-feedstock),
+   check for the tests to succeed on this PR and then merge it to successfully
+   update the package for `conda` on the `conda-forge` channel.

nbgitpuller/_config.yml

+theme: jekyll-theme-slate
\ No newline at end of file

nbgitpuller/binder/link_generator.ipynb

+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Generate `nbgitpuller` links for your JupyterHub\n",
+    "\n",
+    "When users click an `nbgitpuller` link pointing to your JupyterHub,\n",
+    "\n",
+    "1. They are asked to log in to the JupyterHub if they have not already\n",
+    "2. The git repository referred to in the nbgitpuller link is made up to date in their home directory (keeping local changes if there are merge conflicts)\n",
+    "3. They are shown the specific notebook / directory referred to in the nbgitpuller link.\n",
+    "\n",
+    "This is a great way to distribute materials to students.\n",
+    "\n",
+    "# Generate `nbgitpuller` links for your JupyterHub\n",
+    "\n",
+    "## Sequence of events when users click an `nbgitpuller` link pointing to your JupyterHub,\n",
+    "\n",
+    "1. They are asked to log in to the JupyterHub if they have not already\n",
+    "2. The git repository referred to in the nbgitpuller link is made up to date in their home directory (keeping local changes if there are merge conflicts)\n",
+    "3. They are shown the specific notebook / directory referred to in the nbgitpuller link.\n",
+    "\n",
+    "This is a great way to distribute materials to students.\n",
+    "\n",
+    "## Canvas LMS: Assignment Links vs Custom Fields\n",
+    "\n",
+    "The Canvas LMS expects the assignment link to include URL encoded parameters since the request is sent to the External Tool as a POST request (in this case JupyterHub is the External Tool). However, all characters (even those considered safe) after the domain and `next=` part should be URL encoded, such as the `/`, `&`, and `=` characters.\n",
+    "\n",
+    "The `Custom Fields` text box in the App -> Settings section, on the other hand, does not expect all characters to be URL encoded. The `/` characters that are assigned as part of the query parameter values should be encoded, but not the `&` and `=` characters.\n",
+    "\n",
+    "## Usage\n",
+    "\n",
+    "- **Assignment Link**: creates a string value which represents an `Assignment` link by toggling the check box next to the `is_assignment_link` label. If unchecked, the tool will create a string to add to the Custom Field section.\n",
+    "- **Jupyter Lab Link**: creates a string value which redirects the user to a `Jupyter Lab` workspace instead of the `Jupyter Classic` workspace.\n",
+    "- **LTI Launches**: adds the route associated to the LTI 1.1 login handler. If disabled, it is assumed that the user is using the default authentication class bound to the root of the `domain_url` value.\n",
+    "- **Default Values**: to avoid having to enter the same values in the widget's text fields on a repetitive basis, add the string values to the function's parameters. For example, the `branch` parameter defaults to `master`."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [
+    {
+     "output_type": "display_data",
+     "data": {
+      "text/plain": "'https://my.hub.com/hub/lti/launch?next=%2Fuser-redirect%2Fgit-pull?repo%3D%26branch%3Dmaster%26urlpath%3Dlab%252Ftree%252F.%252F%253Fautodecode'"
+     },
+     "metadata": {}
+    }
+   ],
+   "source": [
+    "import os\n",
+    "from ipywidgets import interact\n",
+    "from urllib.parse import urlunparse, urlparse, urlencode, parse_qs, parse_qsl, quote\n",
+    "from IPython.display import Markdown\n",
+    "\n",
+    "\n",
+    "@interact\n",
+    "def make_launch_link(is_assignment_link=True, is_jupyterlab=True, is_lti11=True, branch='master', hub_url='https://my.hub.com', repo_url='', urlpath=''):\n",
+    "    \"\"\"\n",
+    "    Generate a launch request which clones and merges source files from a git-based\n",
+    "    repository.\n",
+    "\n",
+    "    Args:\n",
+    "      is_assignment_link (bool): set to True to create a full assignment link, defaults to True.\n",
+    "      is_jupyterlab (bool): set to True to launch Jupyter Lab workspaces, defaults to True.\n",
+    "      is_lti11 (bool): set to True to initiate launch requests with the LTI 1.1 standard.\n",
+    "      branch (str): git repo branch\n",
+    "      hub_url (str): full hub url which needs to include scheme (http or https) and netloc (full domain).\n",
+    "      repo_url (str): full git repo url which needs to include scheme (http or https), netloc (full domain) and path.\n",
+    "      url_path (str): a path to redirect users to after the workspace has successfully spawned (started).\n",
+    "\n",
+    "    Returns:\n",
+    "      An interactive IPython.display.Markdown object.\n",
+    "    \"\"\"\n",
+    "\n",
+    "    # Parse the query to its constituent parts\n",
+    "    domain_scheme, domain_netloc, domain_path, domain_params, domain_query_str, domain_fragment = urlparse(hub_url.strip())\n",
+    "    \n",
+    "    repo_scheme, repo_netloc, repo_path, repo_params, repo_query_str, repo_fragment = urlparse(repo_url.strip())\n",
+    "    folder_from_repo_url_path = os.path.basename(os.path.normpath(repo_path))\n",
+    "    \n",
+    "    # Make sure the path doesn't contain multiple slashes\n",
+    "    if not domain_path.endswith('/'):\n",
+    "        domain_path += '/'\n",
+    "    domain_path += 'user-redirect/git-pull'\n",
+    "    \n",
+    "    # With Canvas using LTI 11 Assignment launch requests all characters after the netloc are considered unsafe.\n",
+    "    # When adding custom parameters within the App Settings -> Custom Fields section, only items after the \n",
+    "    path_encoded = ''\n",
+    "    if is_assignment_link:\n",
+    "        path_encoded = quote(domain_path, safe='')\n",
+    "    else:\n",
+    "        path_encoded = quote(domain_path)\n",
+    "\n",
+    "    path_redirect_url = f'next={path_encoded}'\n",
+    "    if is_lti11:\n",
+    "        assignment_link_path = f'/hub/lti/launch?next={path_encoded}'\n",
+    "    else:\n",
+    "        assignment_link_path = f'/hub?next={path_encoded}'\n",
+    "    \n",
+    "    # Create a tuple of query params from original domain link\n",
+    "    query_params_from_hub_url = parse_qsl(domain_query_str, keep_blank_values=True)\n",
+    "    \n",
+    "    # Set path based on whether or not the user would like to spawn JupyterLab or Jupyter Classic\n",
+    "    urlpath_workspace = ''\n",
+    "    if is_jupyterlab:\n",
+    "        urlpath_workspace = f'lab/tree/{folder_from_repo_url_path}/{urlpath}?autodecode'\n",
+    "    else:\n",
+    "        urlpath_workspace = f'tree/{folder_from_repo_url_path}/{urlpath}'\n",
+    "    \n",
+    "    # Create a tuple of query params for git functionality. Check whether or not we want to launch with\n",
+    "    # jupyterlab to add additional items to the path.\n",
+    "    query_params_for_git = [('repo', repo_url), ('branch', branch), ('urlpath', urlpath_workspace)]\n",
+    "    \n",
+    "    # Merge query params into one list of tuples\n",
+    "    query_params_all = query_params_from_hub_url + query_params_for_git\n",
+    "    \n",
+    "    # First build urlencoded query params where the &, =, and / are considered safe. Then, percent encode\n",
+    "    # all characters.\n",
+    "    encoded_query_params = urlencode(query_params_all)\n",
+    "    encoded_query_params_without_safe_chars = quote(urlencode(query_params_all), safe='')\n",
+    "    \n",
+    "    assignment_link_url = urlunparse((domain_scheme, domain_netloc, assignment_link_path, domain_params, encoded_query_params_without_safe_chars, domain_fragment))\n",
+    "    path_url = urlunparse(('', '', path_redirect_url, domain_params, encoded_query_params, domain_fragment))\n",
+    "    \n",
+    "    if is_assignment_link:\n",
+    "        return assignment_link_url\n",
+    "    return path_url"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.8.1-final"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}

nbgitpuller/binder/postBuild

+#!/bin/bash
+jupyter nbextension     enable --py --sys-prefix appmode
+jupyter serverextension enable --py --sys-prefix appmode
\ No newline at end of file

nbgitpuller/binder/requirements.txt

+ipywidgets
+appmode
\ No newline at end of file

nbgitpuller/dev-requirements.txt

+six
+pytest
+pytest-cov
+flake8
+nbclassic
+nest-asyncio

nbgitpuller/docs/Makefile

+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line.
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
+SPHINXPROJ    = Binder
+SOURCEDIR     = .
+BUILDDIR      = _build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.PHONY: help Makefile
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)

nbgitpuller/docs/_static/link_gen/link.js

+// Pure function that generates an nbgitpuller URL
+function generateRegularUrl(hubUrl, urlPath, repoUrl, branch) {
+
+    // assume hubUrl is a valid URL
+    var url = new URL(hubUrl);
+
+    url.searchParams.set('repo', repoUrl);
+
+    if (urlPath) {
+        url.searchParams.set('urlpath', urlPath);
+    }
+
+    if (branch) {
+        url.searchParams.set('branch', branch);
+    }
+
+    if (!url.pathname.endsWith('/')) {
+        url.pathname += '/'
+    }
+    url.pathname += 'hub/user-redirect/git-pull';
+
+    return url.toString();
+}
+
+function generateCanvasUrl(hubUrl, urlPath, repoUrl, branch) {
+    // assume hubUrl is a valid URL
+    var url = new URL(hubUrl);
+
+    var nextUrlParams = new URLSearchParams();
+
+    nextUrlParams.append('repo', repoUrl);
+
+    if (urlPath) {
+        nextUrlParams.append('urlpath', urlPath);
+    }
+
+    if (branch) {
+        nextUrlParams.append('branch', branch);
+    }
+
+    var nextUrl = '/hub/user-redirect/git-pull?' + nextUrlParams.toString();
+
+    if (!url.pathname.endsWith('/')) {
+        url.pathname += '/'
+    }
+    url.pathname += 'hub/lti/launch'
+    url.searchParams.append('next', nextUrl);
+
+    return url.toString();
+}
+
+function generateBinderUrl(hubUrl, userName, repoName, branch, urlPath,
+    contentRepoUrl, contentRepoBranch) {
+
+    var url = new URL(hubUrl);
+
+    var nextUrlParams = new URLSearchParams();
+
+    nextUrlParams.append('repo', contentRepoUrl);
+
+    if (urlPath) {
+        nextUrlParams.append('urlpath', urlPath);
+    }
+
+    if (contentRepoBranch) {
+        nextUrlParams.append('branch', contentRepoBranch);
+    }
+
+    var nextUrl = 'git-pull?' + nextUrlParams.toString();
+
+    var path = '/v2/gh/';
+    url.pathname = path.concat(userName, "/", repoName, "/", branch);
+    url.searchParams.append('urlpath', nextUrl);
+
+    return url.toString();
+}
+
+var apps = {
+    classic: {
+        title: 'Classic Notebook',
+        generateUrlPath: function (path) { return 'tree/' + path; },
+    },
+    jupyterlab: {
+        title: 'JupyterLab',
+        generateUrlPath: function (path) { return 'lab/tree/' + path; }
+    },
+    shiny: {
+        title: 'Shiny',
+        generateUrlPath: function (path) {
+            // jupyter-shiny-proxy requires everything to end with a trailing slash
+            if (!path.endsWith("/")) {
+                path = path + "/";
+            }
+            return 'shiny/' + path;
+        }
+    },
+    rstudio: {
+        title: 'RStudio',
+        generateUrlPath: function (path) { return 'rstudio/'; }
+    }
+}
+
+function changeTab(div) {
+    var hub = document.getElementById("hub");
+    var hub_help_text = document.getElementById("hub-help-text");
+    var env_repo = document.getElementById("repo");
+    var env_repo_branch = document.getElementById("branch");
+    var env_repo_help_text = document.getElementById("env-repo-help-text");
+    var content_repo = document.getElementById("content-repo-group");
+    var content_branch = document.getElementById("content-branch-group");
+    var id = div.id;
+
+    if (id.includes("binder")) {
+        hub.placeholder = "https://mybinder.org";
+        hub.value = "https://mybinder.org";
+        hub_help_text.hidden = true;
+        hub.labels[0].innerHTML = "BinderHub URL";
+        env_repo.labels[0].innerHTML = "Git Environment Repository URL";
+        env_repo_help_text.hidden = false;
+        env_repo_branch.required = true;
+        env_repo_branch.pattern = ".+";
+        content_repo.hidden = false;
+        content_branch.hidden = false;
+    } else {
+        hub.placeholder = "https://hub.example.com";
+        hub_help_text.hidden = false;
+        hub.labels[0].innerHTML = "JupyterHub URL";
+        env_repo.labels[0].innerHTML = "Git Repository URL";
+        env_repo_help_text.hidden = true;
+        env_repo_branch.required = false;
+        content_repo.hidden = true;
+        content_branch.hidden = true;
+    }
+}
+
+/**
+ * Return name of directory git will clone given repo to.
+ *
+ * nbgitpuller needs to redirect users to *inside* the directory it
+ * just cloned. We copy the logic git itself uses to determine that.
+ * See https://github.com/git/git/blob/1c52ecf4ba0f4f7af72775695fee653f50737c71/builtin/clone.c#L276
+ */
+function generateCloneDirectoryName(gitCloneUrl) {
+    var lastPart = gitCloneUrl.split('/').slice(-1)[0];
+    return lastPart.split(':').slice(-1)[0].replace(/(\.git|\.bundle)?/, '');
+}
+
+function displayLink() {
+    var form = document.getElementById('linkgenerator');
+
+    form.classList.add('was-validated');
+    if (form.checkValidity()) {
+        var hubUrl = document.getElementById('hub').value;
+        var repoUrl = document.getElementById('repo').value;
+        var branch = document.getElementById('branch').value;
+        var contentRepoUrl = document.getElementById('content-repo').value;
+        var contentRepoBranch = document.getElementById('content-branch').value;
+        var filePath = document.getElementById('filepath').value;
+        var appName = form.querySelector('input[name="app"]:checked').value;
+        var activeTab = document.querySelector(".nav-link.active").id;
+
+        if (appName === 'custom') {
+            var urlPath = document.getElementById('urlpath').value;
+        } else {
+            var repoName = generateCloneDirectoryName(repoUrl);
+            var urlPath;
+            if (activeTab === "tab-auth-binder") {
+                var contentRepoName = new URL(contentRepoUrl).pathname.split('/').pop().replace(/\.git$/, '');
+                urlPath = apps[appName].generateUrlPath(contentRepoName + '/' + filePath);
+            } else {
+                urlPath = apps[appName].generateUrlPath(repoName + '/' + filePath);
+            }
+        }
+
+        if (activeTab === "tab-auth-default") {
+            document.getElementById('default-link').value = generateRegularUrl(
+                hubUrl, urlPath, repoUrl, branch
+            );
+        } else if (activeTab === "tab-auth-canvas"){
+            document.getElementById('canvas-link').value = generateCanvasUrl(
+                hubUrl, urlPath, repoUrl, branch
+            );
+        } else if (activeTab === "tab-auth-binder"){
+            // FIXME: userName parsing using new URL(...) assumes a 
+            // HTTP based repoUrl. Does it make sense to create a
+            // BinderHub link for SSH URLs? Then let's fix this parsing.
+            var userName = new URL(repoUrl).pathname.split('/')[1];
+            document.getElementById('binder-link').value = generateBinderUrl(
+                hubUrl, userName, repoName, branch, urlPath, contentRepoUrl, contentRepoBranch
+            );
+        }
+    }
+}
+function populateFromQueryString() {
+    // preseed values if specified in the url
+    var params = new URLSearchParams(window.location.search);
+    // Parameters are read from query string, and <input> fields are set to them
+    var allowedParams = ['hub', 'repo', 'content-repo', 'branch', 'app', 'urlpath'];
+    if (params.has("urlpath")) {
+        // setting urlpath implies a custom app
+        document.getElementById('app-custom').checked = true;
+    }
+    for (var i = 0; i < allowedParams.length; i++) {
+        var param = allowedParams[i];
+        if (params.has(param)) {
+            if ((param === 'app') && !params.has("urlpath")) {
+                radioId = 'app-' + params.get(param).toLowerCase();
+                document.getElementById(radioId).checked = true;
+            } else {
+                document.getElementById(param).value = params.get(param);
+            }
+        }
+    }
+}
+
+/**
+ * Main loop of the program.
+ *
+ * Called whenever any state changes (input received, page loaded, etc).
+ * Should turn on / off elements based only on current state, and display the link
+ *
+ * Sort of react-ish.
+ */
+function render() {
+    var form = document.getElementById('linkgenerator');
+    var appName = form.querySelector('input[name="app"]:checked').value;
+
+    if (appName == 'custom') {
+        document.getElementById('urlpath').disabled = false;
+        document.getElementById('filepath').disabled = true;
+    } else {
+        document.getElementById('urlpath').disabled = true;
+
+        var app = apps[appName];
+        if (!app.generateUrlPath) {
+            document.getElementById('filepath').disabled = true;
+        } else {
+            document.getElementById('filepath').disabled = false;
+        }
+    }
+    displayLink();
+}
+
+/**
+ * Entry point
+ */
+function main() {
+    // Hook up any changes in form elements to call render()
+    document.querySelectorAll('#linkgenerator input[type="radio"]').forEach(
+        function (element) {
+            element.addEventListener('change', render);
+        }
+    )
+    document.querySelectorAll('#linkgenerator input[type="text"], #linkgenerator input[type="url"]').forEach(
+        function (element) {
+            element.addEventListener('input', render);
+        }
+    )
+
+    populateFromQueryString();
+
+    // Activate tabs based on search parameters
+    var params = new URL(window.location).searchParams;
+    if (params.get("tab")) {
+      if (params.get("tab") === "binder") {
+        $("#tab-auth-binder").click()
+      } else if (params.get("tab") === "canvas") {
+        $("#tab-auth-canvas").click()
+      }
+    }
+
+    // Do an initial render, to make sure our disabled / enabled properties are correctly set
+    render();
+}
+
+window.onload = main;

nbgitpuller/docs/_templates/layout.html

+{%- extends "sphinx_book_theme/layout.html" %}
+
+<!-- Adding CSS to make the link generator wider -->
+{% block extrahead %}
+{% if pagename == 'link' %}
+<style>
+    div.body {
+        max-width: 1000px !important;
+        padding-right: 0px !important;
+    }
+</style>
+{% endif %}
+{{ super() }}
+{% endblock %}

nbgitpuller/docs/conf.py

+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+github_doc_root = "https://github.com/rtfd/recommonmark/tree/master/doc/"
+
+
+def setup(app):
+    app.add_stylesheet("custom.css")
+    app.add_javascript("link_gen/link.js")
+
+
+# -- General configuration ------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+#
+# needs_sphinx = '1.0'
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = [
+    "myst_parser",
+    "sphinx.ext.intersphinx",
+]
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ["_templates"]
+
+# The suffix(es) of source filenames.
+# You can specify multiple suffix as a list of string:
+
+source_suffix = [".rst", ".md"]
+
+
+# The root toctree document.
+root_doc = master_doc = "index"
+
+# General information about the project.
+project = "nbgitpuller"
+copyright = "2017, The nbgitpuller Team"
+author = "The nbgitpuller Team"
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The short X.Y version.
+version = "0.1b"
+# The full version, including alpha/beta/rc tags.
+release = "0.1b"
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# This is also used if you do content translation via gettext catalogs.
+# Usually you set "language" from the command line for these cases.
+language = None
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This patterns also effect to html_static_path and html_extra_path
+exclude_patterns = ["_build", "Thumbs.db", ".DS_Store"]
+
+html_sidebars = {"**": ["globaltoc.html", "relations.html", "searchbox.html"]}
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = "sphinx"
+
+# If true, `todo` and `todoList` produce output, else they produce nothing.
+todo_include_todos = False
+
+# -- Options for HTML output ----------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+#
+html_theme = "sphinx_book_theme"
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+#
+# html_theme_options = {}
+
+html_context = {
+    "github_user": "jupyterhub",
+    "github_repo": "nbgitpuller",
+    "github_version": "main",
+    "doc_path": "doc",
+    "source_suffix": source_suffix,
+}
+
+html_theme_options = {
+    "repository_url": "https://github.com/jupyterhub/nbgitpuller",
+    "use_issues_button": True,
+    "use_repository_button": True
+}
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ["_static"]
+
+
+# -- Options for HTMLHelp output ------------------------------------------
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = "nbgitpullerdoc"
+
+
+# -- Options for LaTeX output ---------------------------------------------
+
+latex_elements = {
+    # The paper size ('letterpaper' or 'a4paper').
+    #
+    # 'papersize': 'letterpaper',
+    # The font size ('10pt', '11pt' or '12pt').
+    #
+    # 'pointsize': '10pt',
+    # Additional stuff for the LaTeX preamble.
+    #
+    # 'preamble': '',
+    # Latex figure (float) alignment
+    #
+    # 'figure_align': 'htbp',
+}
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title,
+#  author, documentclass [howto, manual, or own class]).
+latex_documents = [
+    (
+        root_doc,
+        "nbgitpuller.tex",
+        "nbgitpuller Documentation",
+        "The nbgitpuller Team",
+        "manual",
+    )
+]
+
+
+# -- Options for manual page output ---------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [(root_doc, "nbgitpuller", "nbgitpuller Documentation", [author], 1)]
+
+
+# -- Options for Texinfo output -------------------------------------------
+
+# Grouping the document tree into Texinfo files. List of tuples
+# (source start file, target name, title, author,
+#  dir menu entry, description, category)
+texinfo_documents = [
+    (
+        root_doc,
+        "nbgitpuller",
+        "nbgitpuller Documentation",
+        author,
+        "nbgitpuller",
+        "One line description of project.",
+        "Miscellaneous",
+    )
+]

nbgitpuller/docs/contributing.md

+# Contributing
+
+## Setup
+
+nbgitpuller is a jupyter extension that works with both the
+[classic Notebook Server](https://jupyter-notebook.readthedocs.io/en/stable/extending/handlers.html),
+and the newer [Jupyter Server](https://jupyter-server.readthedocs.io/en/latest/operators/configuring-extensions.html).
+Hence, nbgitpuller can be developed locally without needing a JupyterHub.
+
+1. Fork the nbgitpuller repository and `git clone` it to your local computer.
+
+2. Inside the nbgitpuller clone on your local machine, setup a virtual
+   environment to do development in
+
+   ```bash
+   python3 -m venv venv
+   source venv/bin/activate
+   ```
+
+3. Install development time dependencies in this virtual environment
+
+   ```bash
+   pip install -r dev-requirements.txt
+   ```
+
+4. Install nbgitpuller with its dependencies in this virtual environment
+
+   ```bash
+   pip install -e .
+   ```
+
+5. Install the NodeJS dependencies from package.json.
+
+   ```bash
+   npm install
+   ```
+
+6. Create the JS and CSS bundles.
+
+   ```bash
+   npm run webpack
+   ```
+
+7. Enable the nbgitpuller extension:
+   * as a jupyter serverextension (classic Notebook Server extension)
+
+      ```bash
+      jupyter serverextension enable --sys-prefix nbgitpuller
+      ```
+   * as a jupyter server extension
+      ```bash
+      jupyter server extension enable --sys-prefix nbgitpuller
+      ```
+
+8. Start the notebook server:
+
+   * You can either start the classical Notebook server.
+   This will open the classic notebook in your web
+   browser, and automatically authenticate you as a side effect.
+
+      ```bash
+      jupyter notebook
+      ```
+
+   * Or you can start the new Jupyter Server.
+      ```bash
+      jupyter server
+      ```
+      This won't open any notebook interface, unless you don't enable one
+      ([`nbclassic`](https://github.com/jupyterlab/nbclassic) or [`jupyterlab`](https://github.com/jupyterlab/jupyterlab))
+      as a jupyter server extension.
+      ```bash
+      jupyter server extension enable --sys-prefix nbclassic
+      ```
+      or
+      ```bash
+      jupyter server extension enable --sys-prefix jupyterlab
+      ```
+
+9. You can now test nbgitpuller locally, by hitting the `/git-pull` url with any
+   of the [URL query parameters](topic/url-options.rst). For example, to pull the
+   [data-8/textbook](https://github.com/data-8/textbook) repository's `gh-pages`
+   branch, you can use the following URL:
+
+   ```
+   http://localhost:8888/git-pull?repo=https://github.com/data-8/textbook&branch=gh-pages
+   ```
+
+10. If you make changes to nbgitpuller's python code, you need to restart the `jupyter notebook`
+   process (started in step 5) to see your changes take effect. This is not needed if
+   you are only working on the javascript or css.
+
+## Running the flake8 linter
+
+[flake8](https://flake8.pycqa.org/en/latest/) is used to validate python coding style. The
+flake8 config is in `.flake8`, and is not super strict. You should be able to run
+`flake8` in the root directory of the repository to get a list of issues to be fixed.
+
+## Running tests
+
+[pytest](https://docs.pytest.org/) is used to run unit and integration tests,
+under the `tests/` directory. If you add new functionality, you should also add
+tests to cover it.  You can run the tests locally with `py.test tests/`
+
+## Building documentation
+
+[sphinx](https://www.sphinx-doc.org/) is used to write and maintain documentation, under
+the `docs/` directory. If you add any new functionality, you should write documentaiton
+for it as well. A mix of [reStructuredText](https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html)
+and [MyST Markdown](https://myst-parser.readthedocs.io) is used to write our documentation,
+although we would like to migrate purely to MyST markdown in the future.
+
+1. Install the packages needed to build the documentation
+
+   ```bash
+   pip install -r docs/doc-requirements.txt
+   ```
+
+2. Build the documentation by using `make` inside the `docs` folder. This will
+   internally call `sphinx`
+
+   ```bash
+   cd docs
+   make html
+   ```
+
+3. Preview the documentation by opening `_build/html/index.html` file in
+   your browser. From inside the `docs` folder, you can run either
+   `open _build/html/index.html` (on MacOS) or `xdg-open _build/html/index.html`
+   to quickly open the file in the browser.
+
+4. You can run `make html` again after making further changes to see their
+   effects.

nbgitpuller/docs/doc-requirements.txt

+myst_parser
+sphinx_copybutton
+sphinx-book-theme

nbgitpuller/docs/index.rst

+===========
+nbgitpuller
+===========
+
+``nbgitpuller`` lets you distribute content in a git repository to your
+students by having them click a simple link. :ref:`Automatic, opinioned
+conflict resolution <topic/automatic-merging>` ensures that your students are
+never exposed to ``git`` directly. It is primarily used with a JupyterHub,
+but can also work on students' local laptops.
+
+.. image:: _static/nbpuller.gif
+
+When to use nbgitpuller?
+========================
+
+You should use nbgitpuller when:
+
+#. You are running a JupyterHub for a class & want an easy way to distribute
+   materials to your students without them having to understand what git is.
+#. You have a different out of band method for collecting completed
+   assignments / notebooks from students, since they can not just 'push it
+   back' via git.
+
+You should **not** use nbgitpuller when:
+
+#. You are an instructor using a JupyterHub / running notebooks locally to
+   create materials and push them to a git repository. You should just use
+   git directly, since the assumptions and design of nbgitpuller **will**
+   surprise you in unexpected ways if you are pushing with git but pulling
+   with nbgitpuller.
+#. Your students are performing manual git operations on the git repository
+   cloned as well as using nbgitpuller. Mixing manual git operations +
+   automatic nbgitpuller operations is going to cause surprises on an ongoing
+   basis, and should be avoided.
+
+Installation
+============
+
+If you already have a JupyterHub, you can follow :ref:`these installation
+instructions <install>` to install nbgitpuller there. They should also
+work for installation on a local Jupyter Notebook installation without
+JupyterHub.
+
+If you do *not* have a JupyterHub, we recommend trying out `The Littlest
+JupyterHub <https://tljh.jupyter.org>`_ to set one up. It comes built
+in with nbgitpuller.
+
+Using nbgitpuller as an instructor
+==================================
+
+Once installed, you create a specially crafted web link (called
+*nbgitpuller links*) and send to your students via any method you like -
+course website, LMS, email, etc. This link will contain at least the
+following information:
+
+#. The location of the JupyterHub you are sending them to.
+#. The git repository where you have published your content.
+#. Optionally, a particular file or directory you want to automatically
+   open for your students once the repository has been synchronized. Note the entire repository will be copied, not just the specified file.
+
+The first time a particular student clicks the link, a local copy of the
+repository is made for the student. On successive clicks, the latest version
+of the remote repository is fetched, and merged automatically with the
+student's local copy using a :ref:`series of rules <topic/automatic-merging>`
+that ensure students never get merge conflicts.
+
+You can generate such *nbgitpuller links* with the `generator
+<https://jupyterhub.github.io/nbgitpuller/link>`_.
+
+There is also a video showing you how to use nbgitpuller
+
+.. raw:: html
+
+   <iframe
+        width="560" height="315"
+        src="https://www.youtube-nocookie.com/embed/o7U0ZuICVFg"
+        frameborder="0"
+        allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"
+        allowfullscreen>
+   </iframe>
+
+If you are interested in the details of available options when creating
+the link, we have a :ref:`list of options <topic/url-options>` as well.
+
+Full Contents
+=============
+
+.. toctree::
+   :maxdepth: 2
+ 
+   install
+   contributing
+   topic/automatic-merging
+   topic/url-options
+   topic/repo-best-practices
+   link

nbgitpuller/docs/install.rst

+.. _install:
+
+============
+Installation
+============
+
+You can install ``nbgitpuller`` from PyPI with ``pip`` in the same
+environment where your jupyter notebook package is installed.
+
+.. code:: bash
+
+   pip install nbgitpuller
+
+Troubleshooting
+===============
+
+nbgitpuller link shows `404 Not Found` 
+--------------------------------------
+
+If you are on an old version of Jupyter Notebook, you might get a `404 Not Found`
+error when trying to access an nbgitpuller link. You might need to manually enable
+the server extension that handles nbgitpuller.
+
+.. code:: bash
+
+   jupyter serverextension enable nbgitpuller --sys-prefix

nbgitpuller/docs/link.rst

+nbgitpuller link generator
+==========================
+
+Use the following form to create your own ``nbgitpuller`` links.
+
+.. raw:: html
+
+   <div class="container full-width">
+       <form id="linkgenerator" class="form needs-validation">
+
+           <div class="form-group">
+
+             <ul class="nav nav-tabs justify-content-end" role="tablist">
+               <li class="nav-item">
+                 <a class="nav-link active" id="tab-auth-default" data-toggle="tab" role="tab" href="#auth-default" aria-controls="auth-default" onclick="changeTab(this)">
+                   <small>JupyterHub</small>
+                 </a>
+               </li>
+               <li class="nav-item">
+                 <a class="nav-link" id="tab-auth-canvas" data-toggle="tab" role="tab" href="#auth-canvas" aria-controls="auth-canvas" onclick="changeTab(this)">
+                   <small>Launch from Canvas</small>
+                 </a>
+               </li>
+               <li class="nav-item">
+                 <a class="nav-link" id="tab-auth-binder" data-toggle="tab" role="tab" href="#auth-binder" aria-controls="auth-binder" onclick="changeTab(this)">
+                   <small>Binder</small>
+                 </a>
+               </li>
+             </ul>
+
+             <div class="tab-content">
+               <div class="tab-pane fade show active" id="auth-default" role="tabpanel" aria-labelledby="tab-auth-default">
+                 <input type="text" readonly class="form-control form-control" id="default-link" name="auth-default-link" placeholder="Generated link appears here...">
+               </div>
+               <div class="tab-pane fade" id="auth-canvas" role="tabpanel" aria-labelledby="tab-auth-canvas">
+                 <input type="text" readonly class="form-control form-control" id="canvas-link" name="auth-canvas-link" placeholder="Generated canvas 'external app' link appears here...">
+               </div>
+               <div class="tab-pane fade" id="auth-binder" role="tabpanel" aria-labelledby="tab-auth-binder">
+                 <input type="text" readonly class="form-control form-control" id="binder-link" name="auth-binder-link" placeholder="Generated Binder link appears here...">
+               </div>
+             </div>
+             </ul>
+           </div>
+
+           <div class="form-group row">
+             <label for="hub" class="col-sm-2 col-form-label">JupyterHub URL</label>
+             <div class="col-sm-10">
+               <input class="form-control" type="url" name="hub" id="hub" placeholder="https://hub.example.com"
+                 required pattern="https?://.+">
+               <div class="invalid-feedback">
+                 Must be a valid web URL
+               </div>
+               <small class="form-text text-muted" id="hub-help-text">
+                 The JupyterHub to send users to.
+                 <a href="https://github.com/jupyterhub/nbgitpuller">nbgitpuller</a> must be installed in this hub.
+               </small>
+             </div>
+           </div>
+
+           <div class="form-group row">
+             <label for="repo" class="col-sm-2 col-form-label">Git Repository URL</label>
+             <div class="col-sm-6">
+               <input class="form-control" type="text" id="repo" placeholder="https://github.com/example/test"
+                 oninput="displayLink()" required pattern="((git|https?)://.+|git@.+:.+)">
+               <div class="invalid-feedback">
+                 Must be a valid git URL
+               </div>
+               <small class="form-text text-muted" id="env-repo-help-text" hidden="true">
+                 The environment repository must have
+                 <a href="https://github.com/jupyterhub/nbgitpuller">nbgitpuller</a> installed.
+               </small>
+             </div>
+             <div class="col-sm-4">
+               <div class="input-group">
+                 <div class="input-group-prepend">
+                   <span class="input-group-text" id="branch-prepend-label">branch</span>
+                 </div>
+                 <input name="branch" id="branch" type="text" class="form-control" value="master" aria-label="Branch Name" aria-describedby="branch-prepend-label">
+                 <small class="form-text text-muted">
+                    Use <code>main</code> instead of <code>master</code> for
+                    <a href="https://github.blog/changelog/2020-10-01-the-default-branch-for-newly-created-repositories-is-now-main/">
+                    new GitHub repositories</a>
+                 </small>
+                 <div class="invalid-feedback">
+                    Must specify a branch name
+                 </div>
+               </div>
+             </div>
+           </div>
+
+           <div class="form-group row" id="content-repo-group" hidden="true">
+             <label for="content-repo" class="col-sm-2 col-form-label">Git Content Repository URL</label>
+             <div class="col-sm-6">
+               <input class="form-control" type="text" id="content-repo" placeholder="https://github.com/example/test"
+                 oninput="displayLink()" pattern="((git|https?)://.+|git@.+:.+)">
+               <div class="invalid-feedback">
+                 Must be a valid git URL
+               </div>
+             </div>
+             <div class="col-sm-4">
+               <div class="input-group" id="content-branch-group" hidden="true">
+                 <div class="input-group-prepend">
+                   <span class="input-group-text" id="content-branch-prepend-label">branch</span>
+                 </div>
+                 <input name="content-branch" id="content-branch" type="text" class="form-control" value="master" aria-label="Branch Name" aria-describedby="content-branch-prepend-label">
+               </div>
+             </div>
+            </div>
+
+           <div class="form-group row" id="filepath-container">
+             <label for="filepath" class="col-sm-2 col-form-label">File to open</label>
+             <div class="col-sm-10">
+               <input class="form-control" type="text" id="filepath" placeholder="index.ipynb"
+                 oninput="displayLink()">
+               <small class="form-text text-muted">
+                 This file or directory from within the repo will open when user clicks the link.
+               </small>
+             </div>
+           </div>
+
+           <div class="form-group row" id="app-container">
+             <div class="col-sm-2 col-form-label">
+               <label for="app" class=>Application to Open</label>
+               <small class="form-text text-muted">
+               </small>
+             </div>
+             <div class="col-sm-10">
+               <div class="form-check">
+                 <input class="form-check-input" type="radio" name="app" id="app-classic" value="classic" checked>
+                 <label class="form-check-label text-dark" for="app-classic">
+                   Classic Jupyter Notebook
+                 </label>
+               </div>
+               <div class="form-check">
+                 <input class="form-check-input" type="radio" name="app" id="app-jupyterlab" value="jupyterlab">
+                 <label class="form-check-label text-dark" for="app-jupyterlab">
+                   JupyterLab
+                 </label>
+               </div>
+               <div class="form-check">
+                 <input class="form-check-input" type="radio" name="app" id="app-rstudio" value="rstudio">
+                 <label class="form-check-label text-dark" for="app-rstudio">
+                   RStudio
+                 </label>
+               </div>
+               <div class="form-check">
+                 <input class="form-check-input" type="radio" name="app" id="app-shiny" value="shiny">
+                 <label class="form-check-label text-dark" for="app-shiny">
+                   Shiny
+                 </label>
+               </div>
+               <div class="form-check">
+                 <input class="form-check-input" type="radio" name="app" id="app-custom" value="custom">
+                 <label class="form-check-label text-dark" for="app-custom">Custom URL</label>
+                 <input class="form-control form-control-sm" type="text" id="urlpath" placeholder="Relative URL to redirect user to"
+                   oninput="displayLink()">
+               </div>
+             </div>
+           </div>
+
+       </form>
+     </div>
+     <br /><br /><br />
+
+
+**Pre-populating some fields in the link generator**
+
+You can pre-populate some fields in order to make it easier for some
+users to create their own links. To do so, use the following URL
+parameters **when accessing this page**:
+
+* ``hub`` is the URL of a JupyterHub
+* ``repo`` is the URL of a github repository to which you're linking
+* ``branch`` is the branch you wish to pull from the Repository
+
+For example, the following URL will pre-populate the form with the
+UC Berkeley DataHub as the JupyterHub::
+
+    https://jupyterhub.github.io/nbgitpuller/link?hub=https://datahub.berkeley.edu
+
+
+**Activating a tab when someone lands on this page**
+
+You can also activate one of the tabs in the form above by default when a user lands
+on this page. To do so, use the ``tab=`` REST parameter. Here are the possible values:
+
+* ``?tab=binder`` - activates the Binder tab
+* ``?tab=canvas`` - activates the Canvas tab.

nbgitpuller/docs/topic/automatic-merging.rst

+.. _topic/automatic-merging:
+
+==========================
+Automatic Merging Behavior
+==========================
+
+``nbgitpuller`` tries to make sure the end user who clicked the link
+**never** has to manually interact with the git repo. This requires us to
+make some opinionated choices on how we handle various cases where both the
+student (end user) and instructor (author of the repo) repo have modified the
+repository.
+
+Here, we describe how we handle the various possible cases each time the
+student clicks the nbgitpuller link.
+
+Case 1: The instructor changed a file that the student has not changed
+======================================================================
+
+The student's changes are left alone, and the instructor's changes are pulled
+in to the local copy. Most common case. This is also what happens when the
+instructor adds a new file / directory.
+
+Case 2: Student & instructor changed different lines in same file
+=================================================================
+
+Very similar to case 1 - the student's changes are left alone, and the
+instructor's changes are merged in to the existing local file.
+
+Case 3: Student & instructor change same lines in same file
+===========================================================
+
+In this case, we **always keep the student's changes**. We want to never
+accidentally lose a student's changes - ``nbgitpuller`` will not eat your
+homework.
+
+Case 4: Student deletes file locally, but instructor doesn't
+============================================================
+
+If the student has deleted a file locally, but the file is still present in
+the remote repo, the file from the remote repo is pulled into the student's
+directory. This enables the use case where a student wants to 'start over'
+a file after having made many changes to it. They can simply delete the file,
+click the nbgitpuller link again, and get a fresh copy.
+
+Case 5: Student creates file manually, but instructor adds file with same name
+==============================================================================
+
+As an example, let's say the student manually creates a file named
+``Untitled141.ipynb`` in the directory where nbgitpuller has pulled a
+repository. At some point afterwards, the instructor creates a file *also*
+named ``Untitled141.ipynb`` and pushes it to the repo.
+
+When the student clicks the nbgitpuller link next, we want to make sure we
+don't destroy the student's work. Since they were created in two different
+places, the likelihood of them being mergeable is low. So we **rename** the
+student's file, and pull the instructor's file. So the student's
+``Untitled141.ipynb`` file will be renamed to
+``Untitled141_<timestamp>.ipynb``, and the instructor's file will be kept at
+``Untitled141.ipynb``.
+
+This is a fairly rare case in our experience.

nbgitpuller/docs/topic/repo-best-practices.md

+# Content git repository best practices
+
+Sometimes, git's flexibility can lead to repositories that cause issues
+when used with nbgitpuller. Here are some recommendations to make your
+nbgitpuller experience smoother.
+
+
+## Never force push
+
+Never use `--force` or `--force-with-lease` when pushing to your repositories.
+This is general good git practice, and unless you have [fairly deep
+understanding](https://xkcd.com/1597/) of how git works, it might screw up some
+of your users' local repositories beyond repair.
+
+If you are using GitHub, you should enable [protected branches](https://docs.github.com/en/github/administering-a-repository/about-protected-branches)
+to prevent accidental force pushes.
+
+## Prevent your repos from becoming huge
+
+Larger git repos increase chances of timeouts and other intermittent failures
+that will be difficult to debug. They might leave your git repo in strange states
+too - contents fetched but not checked out, half-fetched, etc. Try and keep it small -
+under 100MB is great, under 1G is ok, but anything more is probably asking for trouble.
+
+Large datasets are the biggest reason for increasing repository sizes. Try distribute
+datasets some other way, use a subset of data, or compress your data if you need to.
+
+## Don't add `.ipynb_checkpoints` (and similar files) to your git repo
+
+Jupyter uses a hidden `.ipynb_checkpoints` directory to temporarily autosave copies of the
+notebook. If you accidentally commit your local computer's copy of this to the git repo,
+it can cause hard to debug issues when students click nbgitpuller links. The students'
+Jupyter Notebook servers in the JupyterHub will also generate `.ipynb_checkpoints` for
+autosaving, and conflicts between these two can cause issues. Similar issues can happen
+with other temporary, hidden files - like `.DS_Store`, `__pycache__`, etc.
+
+Adding `.ipynb_checkpoints` to your repo's `.gitignore` file will eliminate this
+class of issues completely. `git add` and similar commands will no longer
+accidentally include them in your repo. You can download this [python specific
+gitignore](https://github.com/github/gitignore/blob/master/Python.gitignore)
+file and put it in your repo as `.gitignore`, and it should take care of this.

nbgitpuller/docs/topic/url-options.rst

+.. _topic/url-options:
+
+=============================
+Options in an nbgitpuller URL
+=============================
+
+.. note::
+
+   If you just want to generate an nbgitpuller link, we highly
+   recommend just using the `link generator <https://jupyterhub.github.io/nbgitpuller/link>`_
+
+Most aspects of the nbgitpuller student experience can be configured
+with various options in the nbgitpuller URL. This page documents
+the various options available, and their behavior.
+
+``repo``
+========
+
+The path to the git repository to be pulled from. This will accept
+any parameter that can be passed to a ``git clone`` command.
+
+``branch``
+==========
+
+Branch in the git repo to pull from. Defaults to ``master``.
+
+``urlpath``
+===========
+
+The URL to redirect the user to after synchronization has been complete. This
+URL is primarily used to open a specific file or directory in a specific
+application. This URL is interpreted relative to the base of the notebook
+server. The URL to be specified depends on the application you want
+the file to be opened in.
+
+.. warning::
+
+   ``<full-path-to-file>`` is relative to the directory the notebook
+   server was launched in - so the directory you see if you login to
+   JupyterHub regularly. This means you **must** include the name of
+   the local repository directory too, otherwise nbgitpuller can not
+   find the file.
+
+   For example, if the repository you are cloning is 
+   ``https://github.com/my-user/my-repository``, and the file you want
+   your students to see is ``index.ipynb``, then ``<full-path-to-file>``
+   should be ``my-repository/index.ipynb``, **not** ``index.ipynb``.
+
+   The `link generator <https://jupyterhub.github.io/nbgitpuller/link>`_
+   takes care of all of this for you, so it is recommended to use that.
+
+
+Classic Jupyter Notebook
+------------------------
+
+To open a notebook, file or directory in the classic Jupyter Notebook
+interface, your pattern should be: ``/tree/<full-path-to-file>``.
+
+JupyterLab
+----------
+
+To open a notebook, file or directory in the classic Jupyter Notebook
+interface, your pattern should be:
+``/lab/tree/<full-path-to-file>%3Fautodecode``.
+
+The ``%3Fautodecode`` at the end makes sure you never get `a message
+<https://github.com/jupyterlab/jupyterlab/pull/5950>`_ about needing to
+explicitly name a JupyterLab workspace.
+
+Shiny
+-----
+
+To open a directory containing `shiny <https://shiny.rstudio.com/>`_ files,
+your pattern should be ``/shiny/<full-path-to-directory>/``. The trailing
+slash is important.
+
+RStudio
+-------
+
+If you have RStudio installed and set up for use with your JupyterHub,
+you can pass ``/rstudio`` to ``urlpath`` to open RStudio after the
+repo has been pulled. You can not have RStudio open a specific file
+or directory, unfortunately.
+
+``depth``
+=========
+
+How deep to clone the git repo on initial pull. By default, the
+entire history of the git repository is pulled. This might be
+slow if your git repository is large. You can set this to 1 to
+pull only the latest commit on initial pull.
+
+Only explicitly set this if you are actively having performance
+problems.
+
+
+``targetPath``
+==============
+
+Where to place the repository when it is cloned.
+By default, Git repositories are cloned into the default working directory.
+You can specify a different parent directory for the clone by setting the environment variable ``NBGITPULLER_PARENTPATH``, this should be relative to the working directory.
+If you require full control over the destination directory, or want to set the directory at runtime in the nbgitpuller link use this parameter.
+
+
+Deprecated parameters
+=====================
+
+The following parameters are currently deprecated, and will be removed in
+a future version: ``subpath``, ``app``.

nbgitpuller/nbgitpuller/__init__.py

+from .version import __version__ # noqa
+from .handlers import SyncHandler, UIHandler, LegacyInteractRedirectHandler, LegacyGitSyncRedirectHandler
+from .pull import GitPuller # noqa
+from notebook.utils import url_path_join
+from tornado.web import StaticFileHandler
+import os
+
+
+def _jupyter_server_extension_paths():
+    return [{
+        'module': 'nbgitpuller',
+    }]
+
+
+def load_jupyter_server_extension(nbapp):
+    web_app = nbapp.web_app
+    base_url = url_path_join(web_app.settings['base_url'], 'git-pull')
+    handlers = [
+        (url_path_join(base_url, 'api'), SyncHandler),
+        (base_url, UIHandler),
+        (url_path_join(web_app.settings['base_url'], 'git-sync'), LegacyGitSyncRedirectHandler),
+        (url_path_join(web_app.settings['base_url'], 'interact'), LegacyInteractRedirectHandler),
+        (
+            url_path_join(base_url, 'static', '(.*)'),
+            StaticFileHandler,
+            {'path': os.path.join(os.path.dirname(__file__), 'static')}
+        )
+    ]
+    web_app.settings['nbapp'] = nbapp
+    web_app.add_handlers('.*', handlers)
+
+_load_jupyter_server_extension = load_jupyter_server_extension

nbgitpuller/nbgitpuller/etc/jupyter_notebook_config.d/nbgitpuller.json

+{
+  "NotebookApp": {
+    "nbserver_extensions": {
+      "nbgitpuller": true
+    }
+  }
+}
+

nbgitpuller/nbgitpuller/etc/jupyter_server_config.d/nbgitpuller.json

+{
+  "ServerApp": {
+    "jpserver_extensions": {
+      "nbgitpuller": true
+    }
+  }
+}
+

nbgitpuller/nbgitpuller/handlers.py

+from tornado import gen, web, locks
+import traceback
+import urllib.parse
+
+from notebook.base.handlers import IPythonHandler
+import threading
+import json
+import os
+from queue import Queue, Empty
+import jinja2
+
+from .pull import GitPuller
+from .version import __version__
+from .wget import RequestRepoRawFile
+
+
+class SyncHandler(IPythonHandler):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        # We use this lock to make sure that only one sync operation
+        # can be happening at a time. Git doesn't like concurrent use!
+        if 'git_lock' not in self.settings:
+            self.settings['git_lock'] = locks.Lock()
+
+    @property
+    def git_lock(self):
+        return self.settings['git_lock']
+
+    @gen.coroutine
+    def emit(self, data):
+        if type(data) is not str:
+            serialized_data = json.dumps(data)
+            if 'output' in data:
+                self.log.info(data['output'].rstrip())
+        else:
+            serialized_data = data
+            self.log.info(data)
+        self.write('data: {}\n\n'.format(serialized_data))
+        yield self.flush()
+
+    @web.authenticated
+    @gen.coroutine
+    def get(self):
+        try:
+            yield self.git_lock.acquire(1)
+        except gen.TimeoutError:
+            self.emit({
+                'phase': 'error',
+                'message': 'Another git operations is currently running, try again in a few minutes'
+            })
+            return
+
+        try:
+            repo = self.get_argument('repo')
+            branch = self.get_argument('branch', None)
+            depth = self.get_argument('depth', None)
+            if depth:
+                depth = int(depth)
+            # The default working directory is the directory from which Jupyter
+            # server is launched, which is not the same as the root notebook
+            # directory assuming either --notebook-dir= is used from the
+            # command line or c.NotebookApp.notebook_dir is set in the jupyter
+            # configuration. This line assures that all repos are cloned
+            # relative to server_root_dir/<optional NBGITPULLER_PARENTPATH>,
+            # so that all repos are always in scope after cloning. Sometimes
+            # server_root_dir will include things like `~` and so the path
+            # must be expanded.
+            repo_parent_dir = os.path.join(os.path.expanduser(self.settings['server_root_dir']),
+                                           os.getenv('NBGITPULLER_PARENTPATH', ''))
+            repo_dir = os.path.join(repo_parent_dir, self.get_argument('targetpath', repo.split('/')[-1]))
+
+            # We gonna send out event streams!
+            self.set_header('content-type', 'text/event-stream')
+            self.set_header('cache-control', 'no-cache')
+
+            gp = GitPuller(repo, repo_dir, branch=branch, depth=depth, parent=self.settings['nbapp'])
+
+            q = Queue()
+
+            def pull():
+                try:
+                    for line in gp.pull():
+                        q.put_nowait(line)
+                    # Sentinel when we're done
+                    q.put_nowait(None)
+                except Exception as e:
+                    q.put_nowait(e)
+                    raise e
+            self.gp_thread = threading.Thread(target=pull)
+
+            self.gp_thread.start()
+
+            while True:
+                try:
+                    progress = q.get_nowait()
+                except Empty:
+                    yield gen.sleep(0.5)
+                    continue
+                if progress is None:
+                    break
+                if isinstance(progress, Exception):
+                    self.emit({
+                        'phase': 'error',
+                        'message': str(progress),
+                        'output': '\n'.join([
+                            line.strip()
+                            for line in traceback.format_exception(
+                                type(progress), progress, progress.__traceback__
+                            )
+                        ])
+                    })
+                    return
+
+                self.emit({'output': progress, 'phase': 'syncing'})
+
+            self.emit({'phase': 'finished'})
+        except Exception as e:
+            self.emit({
+                'phase': 'error',
+                'message': str(e),
+                'output': '\n'.join([
+                    line.strip()
+                    for line in traceback.format_exception(
+                        type(e), e, e.__traceback__
+                    )
+                ])
+            })
+        finally:
+            self.git_lock.release()
+
+
+class UIHandler(IPythonHandler):
+    def initialize(self):
+        super().initialize()
+        # FIXME: Is this really the best way to use jinja2 here?
+        # I can't seem to get the jinja2 env in the base handler to
+        # actually load templates from arbitrary paths ugh.
+        jinja2_env = self.settings['jinja2_env']
+        jinja2_env.loader = jinja2.ChoiceLoader([
+            jinja2_env.loader,
+            jinja2.FileSystemLoader(
+                os.path.join(os.path.dirname(__file__), 'templates')
+            )
+        ])
+
+    @web.authenticated
+    @gen.coroutine
+    def get(self):
+        app_env = os.getenv('NBGITPULLER_APP', default='notebook')
+
+        repo = self.get_argument('repo')
+        branch = self.get_argument('branch', None)
+        depth = self.get_argument('depth', None)
+        urlPath = self.get_argument('urlpath', None) or \
+                  self.get_argument('urlPath', None)
+        subPath = self.get_argument('subpath', None) or \
+                  self.get_argument('subPath', '.')
+        app = self.get_argument('app', app_env)
+        parent_reldir = os.getenv('NBGITPULLER_PARENTPATH', '')
+        targetpath = self.get_argument('targetpath', None) or \
+                     self.get_argument('targetPath', repo.split('/')[-1])
+        if(urlPath.endswith('.ipynb')):
+            # 添加获取文件 和跳转的逻辑
+            rrrf = RequestRepoRawFile()
+            path = rrrf.wgetFile(repo, branch, urlPath)
+        else:
+            if urlPath:
+                path = urlPath
+            else:
+                path = os.path.join(parent_reldir, targetpath, subPath)
+                if app.lower() == 'lab':
+                    path = 'lab/tree/' + path
+                elif path.lower().endswith('.ipynb'):
+                    path = 'notebooks/' + path
+                else:
+                    path = 'tree/' + path
+
+        self.write(
+            self.render_template(
+                'status.html',
+                repo=repo, branch=branch, path=path, depth=depth, targetpath=targetpath, version=__version__
+            ))
+        self.flush()
+
+
+class LegacyGitSyncRedirectHandler(IPythonHandler):
+    @web.authenticated
+    @gen.coroutine
+    def get(self):
+        new_url = '{base}git-pull?{query}'.format(
+            base=self.base_url,
+            query=self.request.query
+        )
+        self.redirect(new_url)
+
+
+class LegacyInteractRedirectHandler(IPythonHandler):
+    @web.authenticated
+    @gen.coroutine
+    def get(self):
+        repo = self.get_argument('repo')
+        account = self.get_argument('account', 'data-8')
+        repo_url = 'https://github.com/{account}/{repo}'.format(account=account, repo=repo)
+        query = {
+            'repo': repo_url,
+            # branch & subPath are optional
+            'branch': self.get_argument('branch', 'gh-pages'),
+            'subPath': self.get_argument('path', '.')
+        }
+        new_url = '{base}git-pull?{query}'.format(
+            base=self.base_url,
+            query=urllib.parse.urlencode(query)
+        )
+
+        self.redirect(new_url)

nbgitpuller/nbgitpuller/pull.py

+import os
+import subprocess
+import logging
+import time
+import argparse
+import datetime
+from traitlets import Integer, default
+from traitlets.config import Configurable
+from functools import partial
+
+
+def execute_cmd(cmd, **kwargs):
+    """
+    Call given command, yielding output line by line
+    """
+    yield '$ {}\n'.format(' '.join(cmd))
+    kwargs['stdout'] = subprocess.PIPE
+    kwargs['stderr'] = subprocess.STDOUT
+
+    proc = subprocess.Popen(cmd, **kwargs)
+
+    # Capture output for logging.
+    # Each line will be yielded as text.
+    # This should behave the same as .readline(), but splits on `\r` OR `\n`,
+    # not just `\n`.
+    buf = []
+
+    def flush():
+        line = b''.join(buf).decode('utf8', 'replace')
+        buf[:] = []
+        return line
+
+    c_last = ''
+    try:
+        for c in iter(partial(proc.stdout.read, 1), b''):
+            if c_last == b'\r' and buf and c != b'\n':
+                yield flush()
+            buf.append(c)
+            if c == b'\n':
+                yield flush()
+            c_last = c
+    finally:
+        ret = proc.wait()
+        if ret != 0:
+            raise subprocess.CalledProcessError(ret, cmd)
+
+
+class GitPuller(Configurable):
+    depth = Integer(
+        config=True,
+        help="""
+        Depth (ie, commit count) of clone operations. Set this to 0 to make a
+        full depth clone.
+
+        Defaults to the value of the environment variable NBGITPULLER_DEPTH, or
+        1 if the the environment variable isn't set.
+        """
+    )
+
+    @default('depth')
+    def _depth_default(self):
+        """This is a workaround for setting the same default directly in the
+        definition of the traitlet above. Without it, the test fails because a
+        change in the environment variable has no impact. I think this is a
+        consequence of the tests not starting with a totally clean environment
+        where the GitPuller class hadn't been loaded already."""
+        return int(os.environ.get('NBGITPULLER_DEPTH', 1))
+
+    def __init__(self, git_url, repo_dir, **kwargs):
+        assert git_url
+
+        self.git_url = git_url
+        self.branch_name = kwargs.pop("branch")
+
+        if self.branch_name is None:
+            self.branch_name = self.resolve_default_branch()
+        elif not self.branch_exists(self.branch_name):
+            raise ValueError(f"Branch: {self.branch_name} -- not found in repo: {self.git_url}")
+
+        self.repo_dir = repo_dir
+        newargs = {k: v for k, v in kwargs.items() if v is not None}
+        super(GitPuller, self).__init__(**newargs)
+
+    def branch_exists(self, branch):
+        """
+        This checks to make sure the branch we are told to access
+        exists in the repo
+        """
+        try:
+            heads = subprocess.run(
+                ["git", "ls-remote", "--heads", "--", self.git_url],
+                capture_output=True,
+                text=True,
+                check=True
+            )
+            tags = subprocess.run(
+                ["git", "ls-remote", "--tags", "--", self.git_url],
+                capture_output=True,
+                text=True,
+                check=True
+            )
+            lines = heads.stdout.splitlines() + tags.stdout.splitlines()
+            branches = []
+            for line in lines:
+                _, ref = line.split()
+                refs, heads, branch_name = ref.split("/", 2)
+                branches.append(branch_name)
+            return branch in branches
+        except subprocess.CalledProcessError:
+            m = f"Problem accessing list of branches and/or tags: {self.git_url}"
+            logging.exception(m)
+            raise ValueError(m)
+
+    def resolve_default_branch(self):
+        """
+        This will resolve the default branch of the repo in
+        the case where the branch given does not exist
+        """
+        try:
+            head_branch = subprocess.run(
+                ["git", "ls-remote", "--symref", "--", self.git_url, "HEAD"],
+                capture_output=True,
+                text=True,
+                check=True
+            )
+            for line in head_branch.stdout.splitlines():
+                if line.startswith("ref:"):
+                    # line resembles --> ref: refs/heads/main HEAD
+                    _, ref, head = line.split()
+                    refs, heads, branch_name = ref.split("/", 2)
+                    return branch_name
+            raise ValueError(f"default branch not found in {self.git_url}")
+        except subprocess.CalledProcessError:
+            m = f"Problem accessing HEAD branch: {self.git_url}"
+            logging.exception(m)
+            raise ValueError(m)
+
+    def pull(self):
+        """
+        Pull selected repo from a remote git repository,
+        while preserving user changes
+        """
+        if not os.path.exists(self.repo_dir):
+            yield from self.initialize_repo()
+        else:
+            yield from self.update()
+
+    def initialize_repo(self):
+        """
+        Clones repository
+        """
+        logging.info('Repo {} doesn\'t exist. Cloning...'.format(self.repo_dir))
+        clone_args = ['git', 'clone']
+        if self.depth and self.depth > 0:
+            clone_args.extend(['--depth', str(self.depth)])
+        clone_args.extend(['--branch', self.branch_name])
+        clone_args.extend(["--", self.git_url, self.repo_dir])
+        yield from execute_cmd(clone_args)
+        logging.info('Repo {} initialized'.format(self.repo_dir))
+
+    def reset_deleted_files(self):
+        """
+        Runs the equivalent of git checkout -- <file> for each file that was
+        deleted. This allows us to delete a file, hit an interact link, then get a
+        clean version of the file again.
+        """
+
+        yield from self.ensure_lock()
+        deleted_files = subprocess.check_output([
+            'git', 'ls-files', '--deleted', '-z'
+        ], cwd=self.repo_dir).decode().strip().split('\0')
+
+        for filename in deleted_files:
+            if filename:  # Filter out empty lines
+                yield from execute_cmd(['git', 'checkout', 'origin/{}'.format(self.branch_name), '--', filename], cwd=self.repo_dir)
+
+    def repo_is_dirty(self):
+        """
+        Return true if repo is dirty
+        """
+        try:
+            subprocess.check_call(['git', 'diff-files', '--quiet'], cwd=self.repo_dir)
+            # Return code is 0
+            return False
+        except subprocess.CalledProcessError:
+            return True
+
+    def update_remotes(self):
+        """
+        Do a git fetch so our remotes are up to date
+        """
+        yield from execute_cmd(['git', 'fetch'], cwd=self.repo_dir)
+
+    def find_upstream_changed(self, kind):
+        """
+        Return list of files that have been changed upstream belonging to a particular kind of change
+        """
+        output = subprocess.check_output([
+            'git', 'log', '..origin/{}'.format(self.branch_name),
+            '--oneline', '--name-status'
+        ], cwd=self.repo_dir).decode()
+        files = []
+        for line in output.split('\n'):
+            if line.startswith(kind):
+                files.append(os.path.join(self.repo_dir, line.split('\t', 1)[1]))
+
+        return files
+
+    def ensure_lock(self):
+        """
+        Make sure we have the .git/lock required to do modifications on the repo
+
+        This must be called before any git commands that modify state. This isn't guaranteed
+        to be atomic, due to the nature of using files for locking. But it's the best we
+        can do right now.
+        """
+        try:
+            lockpath = os.path.join(self.repo_dir, '.git', 'index.lock')
+            mtime = os.path.getmtime(lockpath)
+            # A lock file does exist
+            # If it's older than 10 minutes, we just assume it is stale and take over
+            # If not, we fail with an explicit error.
+            if time.time() - mtime > 600:
+                yield "Stale .git/index.lock found, attempting to remove"
+                os.remove(lockpath)
+                yield "Stale .git/index.lock removed"
+            else:
+                raise Exception('Recent .git/index.lock found, operation can not proceed. Try again in a few minutes.')
+        except FileNotFoundError:
+            # No lock is held by other processes, we are free to go
+            return
+
+    def rename_local_untracked(self):
+        """
+        Rename local untracked files that would require pulls
+        """
+        # Find what files have been added!
+        new_upstream_files = self.find_upstream_changed('A')
+        for f in new_upstream_files:
+            if os.path.exists(f):
+                # If there's a file extension, put the timestamp before that
+                ts = datetime.datetime.now().strftime('__%Y%m%d%H%M%S')
+                path_head, path_tail = os.path.split(f)
+                path_tail = ts.join(os.path.splitext(path_tail))
+                new_file_name = os.path.join(path_head, path_tail)
+                os.rename(f, new_file_name)
+                yield 'Renamed {} to {} to avoid conflict with upstream'.format(f, new_file_name)
+
+    def update(self):
+        """
+        Do the pulling if necessary
+        """
+        # Fetch remotes, so we know we're dealing with latest remote
+        yield from self.update_remotes()
+
+        # Rename local untracked files that might be overwritten by pull
+        yield from self.rename_local_untracked()
+
+        # Reset local files that have been deleted. We don't actually expect users to
+        # delete something that's present upstream and expect to keep it. This prevents
+        # unnecessary conflicts, and also allows users to click the link again to get
+        # a fresh copy of a file they might have screwed up.
+        yield from self.reset_deleted_files()
+
+        # If there are local changes, make a commit so we can do merges when pulling
+        # We also allow empty commits. On NFS (at least), sometimes repo_is_dirty returns a false
+        # positive, returning True even when there are no local changes (git diff-files seems to return
+        # bogus output?). While ideally that would not happen, allowing empty commits keeps us
+        # resilient to that issue.
+        # We explicitly set user info of the commits we are making, to keep that separate from
+        # whatever author info is set in system / repo config by the user. We pass '-c' to git
+        # itself (rather than to 'git commit') to temporarily set config variables. This is
+        # better than passing --author, since git treats author separately from committer.
+        if self.repo_is_dirty():
+            yield from self.ensure_lock()
+            yield from execute_cmd([
+                'git',
+                '-c', 'user.email=nbgitpuller@nbgitpuller.link',
+                '-c', 'user.name=nbgitpuller',
+                'commit',
+                '-am', 'Automatic commit by nbgitpuller',
+                '--allow-empty'
+            ], cwd=self.repo_dir)
+
+        # Merge master into local!
+        yield from self.ensure_lock()
+        yield from execute_cmd([
+            'git',
+            '-c', 'user.email=nbgitpuller@nbgitpuller.link',
+            '-c', 'user.name=nbgitpuller',
+            'merge',
+            '-Xours', 'origin/{}'.format(self.branch_name)
+        ], cwd=self.repo_dir)
+
+
+def main():
+    """
+    Synchronizes a github repository with a local repository.
+    """
+    logging.basicConfig(
+        format='[%(asctime)s] %(levelname)s -- %(message)s',
+        level=logging.DEBUG)
+
+    parser = argparse.ArgumentParser(description='Synchronizes a github repository with a local repository.')
+    parser.add_argument('git_url', help='Url of the repo to sync')
+    parser.add_argument('branch_name', default=None, help='Branch of repo to sync', nargs='?')
+    parser.add_argument('repo_dir', default='.', help='Path to clone repo under', nargs='?')
+    args = parser.parse_args()
+
+    for line in GitPuller(
+        args.git_url,
+        args.repo_dir,
+        branch=args.branch_name if args.branch_name else None
+    ).pull():
+        print(line)
+
+
+if __name__ == '__main__':
+    main()

nbgitpuller/nbgitpuller/static/js/index.js

+import { Terminal } from 'xterm';
+import { FitAddon } from 'xterm-addon-fit';
+import css from '../../../node_modules/xterm/css/xterm.css';
+
+function GitSync(baseUrl, repo, branch, depth, targetpath, path) {
+    // Class that talks to the API backend & emits events as appropriate
+    this.baseUrl = baseUrl;
+    this.repo = repo;
+    this.branch = branch;
+    this.depth = depth;
+    this.targetpath = targetpath;
+    this.redirectUrl = baseUrl + path;
+
+    this.callbacks = {};
+}
+
+GitSync.prototype.addHandler = function(event, cb) {
+    if (this.callbacks[event] == undefined) {
+        this.callbacks[event] = [cb];
+    } else {
+        this.callbacks[event].push(cb);
+    }
+};
+
+GitSync.prototype._emit = function(event, data) {
+    if (this.callbacks[event] == undefined) { return; }
+    $.each(this.callbacks[event], function(i, ev) {
+        ev(data);
+    });
+};
+
+
+GitSync.prototype.start = function() {
+    if (this.path && this.path.endsWith('.ipynb')){
+        that._emit('finished');
+    }else{
+        // Start git pulling handled by SyncHandler, declared in handlers.py
+        var syncUrlParams = {
+            repo: this.repo,
+            targetpath: this.targetpath
+        }
+        if (typeof this.depth !== 'undefined' && this.depth != undefined) {
+            syncUrlParams['depth'] = this.depth;
+        }
+        if (typeof this.branch !== 'undefined' && this.branch != undefined) {
+            syncUrlParams['branch'] = this.branch;
+        }
+        var syncUrl = this.baseUrl + 'git-pull/api?' + $.param(syncUrlParams);
+
+        this.eventSource = new EventSource(syncUrl);
+        var that = this;
+        this.eventSource.addEventListener('message', function(ev) {
+            var data = JSON.parse(ev.data);
+            if (data.phase == 'finished' || data.phase == 'error') {
+                that.eventSource.close();
+            }
+            that._emit(data.phase, data);
+        });
+        this.eventSource.addEventListener('error', function(error) {
+            console.log(arguments);
+            that._emit('error', error);
+        });
+    }
+};
+
+function GitSyncView(termSelector, progressSelector, termToggleSelector) {
+    // Class that encapsulates view rendering as much as possible
+    this.term = new Terminal({
+        convertEol: true
+    });
+    this.fit = new FitAddon();
+    this.term.loadAddon(this.fit);
+
+    this.visible = false;
+    this.$progress = $(progressSelector);
+
+    this.$termToggle = $(termToggleSelector);
+    this.termSelector = termSelector;
+
+    var that = this;
+    this.$termToggle.click(function() {
+        that.setTerminalVisibility(!that.visible);
+    });
+}
+
+GitSyncView.prototype.setTerminalVisibility = function(visible) {
+    if (visible) {
+        $(this.termSelector).parent().removeClass('hidden');
+    } else {
+        $(this.termSelector).parent().addClass('hidden');
+    }
+    this.visible = visible;
+    if (visible) {
+        // See https://github.com/jupyterhub/nbgitpuller/pull/46 on why this is here.
+        if (!this.term.element) {
+            this.term.open($(this.termSelector)[0]);
+        }
+        this.fit.fit();
+    }
+
+}
+
+GitSyncView.prototype.setProgressValue = function(val) {
+    this.$progress.attr('aria-valuenow', val);
+    this.$progress.css('width', val + '%');
+};
+
+GitSyncView.prototype.getProgressValue = function() {
+    return parseFloat(this.$progress.attr('aria-valuenow'));
+};
+
+GitSyncView.prototype.setProgressText = function(text) {
+    this.$progress.children('span').text(text);
+};
+
+GitSyncView.prototype.getProgressText = function() {
+    return this.$progress.children('span').text();
+};
+
+GitSyncView.prototype.setProgressError = function(isError) {
+    if (isError) {
+        this.$progress.addClass('progress-bar-danger');
+    } else {
+        this.$progress.removeClass('progress-bar-danger');
+    }
+};
+
+var get_body_data = function(key) {
+    /**
+     * get a url-encoded item from body.data and decode it
+     * we should never have any encoded URLs anywhere else in code
+     * until we are building an actual request
+     */
+    var val = $('body').data(key);
+    if (typeof val === 'undefined')
+        return val;
+    return decodeURIComponent(val);
+};
+
+var gs = new GitSync(
+    get_body_data('baseUrl'),
+    get_body_data('repo'),
+    get_body_data('branch'),
+    get_body_data('depth'),
+    get_body_data('targetpath'),
+    get_body_data('path')
+);
+
+var gsv = new GitSyncView(
+    '#status-details',
+    '#status-panel-title',
+    '#status-panel-toggle'
+);
+
+gs.addHandler('syncing', function(data) {
+    gsv.term.write(data.output);
+});
+gs.addHandler('finished', function(data) {
+    progressTimers.forEach(function(timer)  { clearInterval(timer); });
+    gsv.setProgressValue(100);
+    gsv.setProgressText('Sync finished, redirecting...');
+    window.location.href = gs.redirectUrl;
+});
+gs.addHandler('error', function(data) {
+    progressTimers.forEach(function(timer)  { clearInterval(timer); });
+    gsv.setProgressValue(100);
+    gsv.setProgressText('Error: ' + data.message);
+    gsv.setProgressError(true);
+    gsv.setTerminalVisibility(true);
+    if (data.output) {
+        gsv.term.write(data.output);
+    }
+});
+gs.start();
+
+$('#header, #site').show();
+
+// Make sure we provide plenty of appearances of progress!
+var progressTimers = [];
+progressTimers.push(setInterval(function() {
+    gsv.setProgressText(substatus_messages[Math.floor(Math.random() * substatus_messages.length)]);
+}, 3000));
+progressTimers.push(setInterval(function() {
+    gsv.setProgressText(gsv.getProgressText() + '.');
+}, 800));
+
+progressTimers.push(setInterval(function() {
+    // Illusion of progress!
+    gsv.setProgressValue(gsv.getProgressValue() + (0.01 * (100 - gsv.getProgressValue())));
+}, 900));
+
+
+var substatus_messages = [
+    "Adding Hidden Agendas",
+    "Adjusting Bell Curves",
+    "Aesthesizing Industrial Areas",
+    "Aligning Covariance Matrices",
+    "Applying Feng Shui Shaders",
+    "Applying Theatre Soda Layer",
+    "Asserting Packed Exemplars",
+    "Attempting to Lock Back-Buffer",
+    "Binding Sapling Root System",
+    "Breeding Fauna",
+    "Building Data Trees",
+    "Bureacritizing Bureaucracies",
+    "Calculating Inverse Probability Matrices",
+    "Calculating Llama Expectoration Trajectory",
+    "Calibrating Blue Skies",
+    "Charging Ozone Layer",
+    "Coalescing Cloud Formations",
+    "Cohorting Exemplars",
+    "Collecting Meteor Particles",
+    "Compounding Inert Tessellations",
+    "Compressing Fish Files",
+    "Computing Optimal Bin Packing",
+    "Concatenating Sub-Contractors",
+    "Containing Existential Buffer",
+    "Debarking Ark Ramp",
+    "Debunching Unionized Commercial Services",
+    "Deciding What Message to Display Next",
+    "Decomposing Singular Values",
+    "Decrementing Tectonic Plates",
+    "Deleting Ferry Routes",
+    "Depixelating Inner Mountain Surface Back Faces",
+    "Depositing Slush Funds",
+    "Destabilizing Economic Indicators",
+    "Determining Width of Blast Fronts",
+    "Dicing Models",
+    "Diluting Livestock Nutrition Variables",
+    "Downloading Satellite Terrain Data",
+    "Eating Ice Cream",
+    "Exposing Flash Variables to Streak System",
+    "Extracting Resources",
+    "Factoring Pay Scale",
+    "Fixing Election Outcome Matrix",
+    "Flood-Filling Ground Water",
+    "Flushing Pipe Network",
+    "Gathering Particle Sources",
+    "Generating Jobs",
+    "Gesticulating Mimes",
+    "Graphing Whale Migration",
+    "Hiding Willio Webnet Mask",
+    "Implementing Impeachment Routine",
+    "Increasing Accuracy of RCI Simulators",
+    "Increasing Magmafacation",
+    "Initializing Rhinoceros Breeding Timetable",
+    "Initializing Robotic Click-Path AI",
+    "Inserting Sublimated Messages",
+    "Integrating Curves",
+    "Integrating Illumination Form Factors",
+    "Integrating Population Graphs",
+    "Iterating Cellular Automata",
+    "Lecturing Errant Subsystems",
+    "Modeling Object Components",
+    "Normalizing Power",
+    "Obfuscating Quigley Matrix",
+    "Overconstraining Dirty Industry Calculations",
+    "Partitioning City Grid Singularities",
+    "Perturbing Matrices",
+    "Polishing Water Highlights",
+    "Populating Lot Templates",
+    "Preparing Sprites for Random Walks",
+    "Prioritizing Landmarks",
+    "Projecting Law Enforcement Pastry Intake",
+    "Realigning Alternate Time Frames",
+    "Reconfiguring User Mental Processes",
+    "Relaxing Splines",
+    "Removing Road Network Speed Bumps",
+    "Removing Texture Gradients",
+    "Removing Vehicle Avoidance Behavior",
+    "Resolving GUID Conflict",
+    "Reticulating Splines",
+    "Retracting Phong Shader",
+    "Retrieving from Back Store",
+    "Reverse Engineering Image Consultant",
+    "Routing Neural Network Infanstructure",
+    "Scattering Rhino Food Sources",
+    "Scrubbing Terrain",
+    "Searching for Llamas",
+    "Seeding Architecture Simulation Parameters",
+    "Sequencing Particles",
+    "Setting Advisor Moods",
+    "Setting Inner Deity Indicators",
+    "Setting Universal Physical Constants",
+    "Smashing The Patriarchy",
+    "Sonically Enhancing Occupant-Free Timber",
+    "Speculating Stock Market Indices",
+    "Splatting Transforms",
+    "Stratifying Ground Layers",
+    "Sub-Sampling Water Data",
+    "Synthesizing Gravity",
+    "Synthesizing Wavelets",
+    "Time-Compressing Simulator Clock",
+    "Unable to Reveal Current Activity",
+    "Weathering Buildings",
+    "Zeroing Crime Network"
+];

nbgitpuller/nbgitpuller/templates/page.html

+<!DOCTYPE HTML>
+<html>
+
+<head>
+    <meta charset="utf-8">
+    <title>{% block title %}Jupyter Server{% endblock %}</title>
+    {% block favicon %}<link id="favicon" rel="shortcut icon" type="image/x-icon" href="{{ static_url("favicon.ico") }}">{% endblock %}
+    <link rel="stylesheet" href="{{static_url("style/bootstrap.min.css") }}" />
+    <link rel="stylesheet" href="{{static_url("style/bootstrap-theme.min.css") }}" />
+    <link rel="stylesheet" href="{{static_url("style/index.css") }}" />
+    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+
+    {% block stylesheet %}
+    {% endblock stylesheet %}
+
+    {% block meta %}
+    {% endblock meta %}
+</head>
+
+<body class="{% block bodyclasses %}{% endblock %}" {% block params %} {% if logged_in and token %}
+  data-jupyter-api-token="{{token | urlencode}}" {% endif %} {% endblock params %} dir="ltr">
+
+  <noscript>
+    <div id='noscript'>
+      {% trans %}Jupyter Server requires JavaScript.{% endtrans %}<br>
+      {% trans %}Please enable it to proceed. {% endtrans %}
+    </div>
+  </noscript>
+
+  <div id="header" role="navigation" aria-label="{% trans %}Top Menu{% endtrans %}">
+    <div id="header-container" class="container">
+      <div id="jupyter_server" class="nav navbar-brand"><a href="{{default_url}}
+    {%- if logged_in and token -%}?token={{token}}{%- endif -%}" title='{% trans %}dashboard{% endtrans %}'>
+          {% block logo %}<img src='{{static_url("logo/logo.png") }}' alt='Jupyter Server' />{% endblock %}
+        </a></div>
+
+      {% block headercontainer %}
+      {% endblock headercontainer %}
+
+      {% block header_buttons %}
+      {% endblock header_buttons %}
+
+    </div>
+    <div class="header-bar"></div>
+
+    {% block header %}
+    {% endblock header %}
+  </div>
+
+  <div id="site">
+    {% block site %}
+    {% endblock site %}
+  </div>
+
+  {% block after_site %}
+  {% endblock after_site %}
+
+  {% block script %}
+  {% endblock script %}
+
+  <script type='text/javascript'>
+    function _remove_token_from_url() {
+      if (window.location.search.length <= 1) {
+        return;
+      }
+      var search_parameters = window.location.search.slice(1).split('&');
+      for (var i = 0; i < search_parameters.length; i++) {
+        if (search_parameters[i].split('=')[0] === 'token') {
+          // remote token from search parameters
+          search_parameters.splice(i, 1);
+          var new_search = '';
+          if (search_parameters.length) {
+            new_search = '?' + search_parameters.join('&');
+          }
+          var new_url = window.location.origin +
+            window.location.pathname +
+            new_search +
+            window.location.hash;
+          window.history.replaceState({}, "", new_url);
+          return;
+        }
+      }
+    }
+    _remove_token_from_url();
+  </script>
+</body>
+
+</html>
\ No newline at end of file

nbgitpuller/nbgitpuller/templates/status.html

+{% extends "page.html" %}
+
+{% block params %}
+{{super()}}
+data-base-url="{{ base_url | urlencode }}"
+data-repo="{{ repo | urlencode }}"
+data-path="{{ path | urlencode }}"
+{% if branch %}data-branch="{{ branch | urlencode }}"{% endif %}
+{% if depth %}data-depth="{{ depth | urlencode }}"{% endif %}
+data-targetpath="{{ targetpath | urlencode }}"
+{% endblock %}
+
+{% block site %}
+<div class="container"">
+    <div class="page-header">
+        Synchronizing <a href="{{ repo }}">git repository</a> before sending you to <strong>{{ path }}...</strong>
+    </div>
+
+    <div class="panel panel-default">
+    <div class="panel-heading" id="status-panel-toggle">
+        <div class="progress">
+            <div class="progress-bar progress-bar-striped active" role="progressbar" aria-valuenow="1" aria-valuemin="0" aria-valuemax="100" style="width: 1%" id="status-panel-title">
+                <span></span>
+            </div>
+        </div>
+        <small>Click to see more details</small>
+    </div>
+    <div class="panel-body hidden" id="status-details-container">
+            <div id="status-details"></div>
+    </div>
+    </div>
+</div>
+{% endblock %}
+
+{% block script %}
+{{super()}}
+<script type="module src="{{ base_url }}git-pull/static/js/index.js"></script>
+<script src="{{ base_url }}git-pull/static/dist/bundle.js"></script>
+{% endblock %}
+
+{% block stylesheet %}
+{{super()}}
+
+<style>
+#status-details-container {
+    padding: 16px;
+    background-color: black;
+}
+#status-details {
+    min-height: 360px;
+}
+
+#status-panel-toggle {
+    cursor: pointer;
+}
+
+#status-panel-toggle small {
+    font-size: smaller;
+    color: #ccc;
+    float: right;
+    margin-top: -10px;
+}
+
+.progress {
+    position: relative;
+}
+
+.progress span {
+    position: absolute;
+    display: block;
+    width: 100%;
+    color: black;
+}
+</style>
+{% endblock %}

nbgitpuller/nbgitpuller/version.py

+""""The nbgitpuller PyPI package SemVer version."""
+__version__ = '0.10.2dev0'

nbgitpuller/nbgitpuller/wget.py

+import os
+import io
+import errno
+import nest_asyncio
+from tornado.httpclient import  HTTPClient, HTTPRequest
+
+class RequestRepoRawFile:
+        
+    def wgetFile(self, repo, branch, path):
+        """
+        Wget repository single file from code repository raw page
+        path: lab/tree/markdown-editor/code123/index.ipynb
+        """
+        file_store_dir = 'tmp/'
+        namespace_path, repo_path = repo.rsplit('/', 1)
+        if path.startswith('lab/tree/'):
+            # lab
+            service = 'lab/tree/'
+            repo_file_path = path.replace('lab/tree/', '', 1)
+            repo_file_path = repo_file_path.replace(repo_path + '/', '', 1)
+        else:
+            # notebook
+            service = 'tree/'
+            repo_file_path = path.replace('tree/', '', 1)
+            repo_file_path = repo_file_path.replace(repo_path + '/', '', 1)
+        repo_file_store_path = file_store_dir + repo_path + '/' + repo_file_path
+        file_url = "%s/-/raw/%s/%s" % (repo, branch, repo_file_path)
+        repo_file_store_dir, file_name = repo_file_store_path.rsplit("/", 1)
+
+        print(">", "mkdir " + repo_file_store_dir)
+        if not os.path.exists(repo_file_store_dir):
+            try:
+                os.makedirs(repo_file_store_dir, 0o755)
+            except OSError as e:
+                print(e)
+                if e.errno != errno.EEXIST:
+                    raise
+
+        print(">", "wget " + file_url)
+        file_content = self.wget(file_url)
+        file_content = file_content.decode('utf8', 'replace')
+        with io.open(repo_file_store_path, 'w', encoding='utf-8') as f:
+            f.write(file_content)
+        return service + repo_file_store_path
+    
+    def wget(self, url):
+        """
+        get file content from a certain url
+        """
+        nest_asyncio.apply()
+        req = HTTPRequest(
+            url,
+            method="GET",
+            headers={
+                "Accept": "application/json",
+                "User-Agent": "CSDN JupyterHub"
+            }
+        )
+        response = HTTPClient().fetch(req)
+        return response.body
+

nbgitpuller/package.json

+{
+  "name": "nbgitpuller",
+  "version": "0.10.1",
+  "description": "`nbgitpuller`",
+  "devDependencies": {
+    "jquery": "^3.6.0",
+    "webpack": "^5.45.1",
+    "webpack-cli": "^4.7.2",
+    "xterm": "^4.13.0",
+    "xterm-addon-fit": "^0.5.0",
+    "css-loader": "^6.2.0",
+    "style-loader": "^3.2.1"
+  },
+  "scripts": {
+    "webpack": "webpack",
+    "webpack:watch": "webpack --watch"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/jupyterhub/nbgitpuller.git"
+  },
+  "author": "",
+  "license": "BSD-3-Clause",
+  "bugs": {
+    "url": "https://github.com/jupyterhub/nbgitpuller/issues"
+  },
+  "homepage": "https://github.com/jupyterhub/nbgitpuller#readme"
+}

nbgitpuller/setup.cfg

+[wheel]
+universal = 1

nbgitpuller/setup.py

+from setuptools import find_packages, setup
+from distutils.util import convert_path
+import subprocess
+
+# Imports __version__, reference: https://stackoverflow.com/a/24517154/2220152
+ns = {}
+ver_path = convert_path('nbgitpuller/version.py')
+with open(ver_path) as ver_file:
+    exec(ver_file.read(), ns)
+__version__ = ns['__version__']
+
+subprocess.check_call(['npm', 'install'])
+subprocess.check_call(['npm', 'run', 'webpack'])
+
+setup(
+    name='nbgitpuller',
+    version=__version__,
+    url='https://github.com/jupyterhub/nbgitpuller',
+    license='3-clause BSD',
+    author='Peter Veerman, YuviPanda',
+    author_email='peterkangveerman@gmail.com',
+    description='Notebook Extension to do one-way synchronization of git repositories',
+    long_description=open('README.md').read(),
+    long_description_content_type='text/markdown',
+    packages=find_packages(),
+    include_package_data=True,
+    platforms='any',
+    install_requires=['notebook>=5.5.0', 'jupyter_server>=1.10.1', 'tornado'],
+    data_files=[
+        ('etc/jupyter/jupyter_server_config.d', ['nbgitpuller/etc/jupyter_server_config.d/nbgitpuller.json']),
+        ('etc/jupyter/jupyter_notebook_config.d', ['nbgitpuller/etc/jupyter_notebook_config.d/nbgitpuller.json'])
+    ],
+    zip_safe=False,
+    entry_points={
+        'console_scripts': [
+            'gitpuller = nbgitpuller.pull:main',
+        ],
+    },
+    classifiers=[
+        'Development Status :: 4 - Beta',
+        'License :: OSI Approved :: BSD License',
+        'Operating System :: POSIX',
+        'Operating System :: MacOS',
+        'Operating System :: Unix',
+        'Programming Language :: Python :: 3',
+        'Topic :: Software Development :: Libraries :: Python Modules',
+    ]
+)

nbgitpuller/tests/test_api.py

+import os
+from http.client import HTTPConnection
+import subprocess
+from time import sleep
+from urllib.parse import quote
+from uuid import uuid4
+import pytest
+
+PORT = os.getenv('TEST_PORT', 18888)
+
+
+def request_api(params, host='localhost'):
+    h = HTTPConnection(host, PORT, 10)
+    query = '&'.join('{}={}'.format(k, quote(v)) for (k, v) in params.items())
+    url = '/git-pull/api?token=secret&{}'.format(query)
+    h.request('GET', url)
+    return h.getresponse()
+
+
+class TestNbGitPullerApi:
+
+    def setup(self):
+        self.jupyter_proc = None
+
+    def teardown(self):
+        if self.jupyter_proc:
+            self.jupyter_proc.kill()
+
+    def start_jupyter(self, jupyterdir, extraenv, backend_type):
+        env = os.environ.copy()
+        env.update(extraenv)
+        if "server" in backend_type:
+            command = [
+                'jupyter-server',
+                '--NotebookApp.token=secret',
+                '--port={}'.format(PORT),
+            ]
+        else:
+            command = [
+                'jupyter-notebook',
+                '--no-browser',
+                '--NotebookApp.token=secret',
+                '--port={}'.format(PORT),
+            ]
+        self.jupyter_proc = subprocess.Popen(command, cwd=jupyterdir, env=env)
+        sleep(2)
+
+    @pytest.mark.parametrize(
+        "backend_type",
+        [
+            ("jupyter-server"),
+            ("jupyter-notebook"),
+        ],
+    )
+    def test_clone_default(self, tmpdir, backend_type):
+        """
+        Tests use of 'repo' and 'branch' parameters.
+        """
+        jupyterdir = str(tmpdir)
+        self.start_jupyter(jupyterdir, {}, backend_type)
+        params = {
+            'repo': 'https://github.com/binder-examples/jupyter-extension',
+            'branch': 'master',
+        }
+        r = request_api(params)
+        assert r.code == 200
+        s = r.read().decode()
+        print(s)
+        assert '--branch master' in s
+        assert "Cloning into '{}/{}'".format(jupyterdir, 'jupyter-extension') in s
+        assert os.path.isdir(os.path.join(jupyterdir, 'jupyter-extension', '.git'))
+
+    @pytest.mark.parametrize(
+        "backend_type",
+        [
+            ("jupyter-server"),
+            ("jupyter-notebook"),
+        ],
+    )
+    def test_clone_targetpath(self, tmpdir, backend_type):
+        """
+        Tests use of 'targetpath' parameter.
+        """
+        jupyterdir = str(tmpdir)
+        target = str(uuid4())
+        self.start_jupyter(jupyterdir, {}, backend_type)
+        params = {
+            'repo': 'https://github.com/binder-examples/jupyter-extension',
+            'branch': 'master',
+            'targetpath': target,
+        }
+        r = request_api(params)
+        assert r.code == 200
+        s = r.read().decode()
+        print(s)
+        assert "Cloning into '{}/{}'".format(jupyterdir, target) in s
+        assert os.path.isdir(os.path.join(jupyterdir, target, '.git'))
+
+    @pytest.mark.parametrize(
+        "backend_type",
+        [
+            ("jupyter-server"),
+            ("jupyter-notebook"),
+        ],
+    )
+    def test_clone_parenttargetpath(self, tmpdir, backend_type):
+        """
+        Tests use of the NBGITPULLER_PARENTPATH environment variable.
+        """
+        jupyterdir = str(tmpdir)
+        parent = str(uuid4())
+        target = str(uuid4())
+        self.start_jupyter(jupyterdir, {'NBGITPULLER_PARENTPATH': parent}, backend_type)
+        params = {
+            'repo': 'https://github.com/binder-examples/jupyter-extension',
+            'branch': 'master',
+            'targetpath': target,
+        }
+        r = request_api(params)
+        assert r.code == 200
+        s = r.read().decode()
+        print(s)
+        assert "Cloning into '{}/{}/{}'".format(jupyterdir, parent, target) in s
+        assert os.path.isdir(os.path.join(jupyterdir, parent, target, '.git'))

nbgitpuller/tests/test_gitpuller.py

+import os
+import shutil
+import subprocess as sp
+import glob
+import time
+import pytest
+
+from traitlets.config.configurable import Configurable
+
+from nbgitpuller import GitPuller
+
+
+class Repository:
+    def __init__(self, path='remote'):
+        self.path = path
+
+    def __enter__(self):
+        os.mkdir(self.path)
+        self.git('init', '--bare')
+        return self
+
+    def __exit__(self, *args):
+        shutil.rmtree(self.path)
+
+    def write_file(self, path, content):
+        with open(os.path.join(self.path, path), 'w') as f:
+            f.write(content)
+
+    def read_file(self, path):
+        with open(os.path.join(self.path, path)) as f:
+            return f.read()
+
+    def git(self, *args):
+        return sp.check_output(
+            ['git'] + list(args),
+            cwd=self.path,
+            stderr=sp.STDOUT
+        ).decode().strip()
+
+
+class Remote(Repository):
+    pass
+
+
+class Pusher(Repository):
+    def __init__(self, remote, path='pusher'):
+        self.remote = remote
+        super().__init__(path=path)
+
+    def __enter__(self):
+        sp.check_output(['git', 'clone', self.remote.path, self.path])
+        self.git('config', '--local', 'user.email', 'pusher@example.com')
+        self.git('config', '--local', 'user.name', 'pusher')
+        return self
+
+    def push_file(self, path, content):
+        self.write_file(path, content)
+        self.git('add', path)
+        self.git('commit', '-am', 'Ignore the message')
+        self.git('push', 'origin', 'master')
+
+
+class Puller(Repository):
+    def __init__(self, remote, path='puller', branch="master", *args, **kwargs):
+        super().__init__(path)
+        remotepath = "file://%s" % os.path.abspath(remote.path)
+        self.gp = GitPuller(remotepath, path, branch=branch, *args, **kwargs)
+
+    def pull_all(self):
+        for line in self.gp.pull():
+            print('{}: {}'.format(self.path, line.rstrip()))
+
+    def __enter__(self):
+        print()
+        self.pull_all()
+        return self
+
+
+# Tests to write:
+# 1. Initialize puller with gitpuller, test for user config & commit presence
+# 2. Push commit with pusher, pull with puller, valiate that nothing has changeed
+# 3. Delete file in puller, run puller, make sure file is back
+# 4. Make change in puller to file, make change in pusher to different part of file, run puller
+# 5. Make change in puller to file, make change in pusher to same part of file, run puller
+# 6. Make untracked file in puller, add file with same name to pusher, run puller
+
+
+def test_initialize():
+    with Remote() as remote, Pusher(remote) as pusher:
+        pusher.push_file('README.md', '1')
+
+        assert not os.path.exists('puller')
+        with Puller(remote, 'puller') as puller:
+            assert os.path.exists(os.path.join(puller.path, 'README.md'))
+            assert puller.git('name-rev', '--name-only', 'HEAD') == 'master'
+            assert puller.git('rev-parse', 'HEAD') == pusher.git('rev-parse', 'HEAD')
+
+
+def command_line_test_helper(remote_path, branch, pusher_path):
+    work_dir = "/".join(os.path.dirname(os.path.abspath(__file__)).split("/")[:-1]) + "/nbgitpuller"
+    try:
+        cmd = ['python3', 'pull.py', remote_path, branch, pusher_path]
+        sp.check_output(
+            cmd,
+            cwd=work_dir
+        ).decode()
+        return True
+    except Exception:
+        return False
+
+
+def test_command_line_existing_branch():
+    branch = "master"
+    with Remote() as remote, Pusher(remote) as pusher:
+        pusher.push_file('README.md', '1')
+        remotepath = "file://%s" % os.path.abspath(remote.path)
+        pusherpath = os.path.abspath(pusher.path)
+        subprocess_result = command_line_test_helper(remotepath, branch, pusherpath)
+    assert subprocess_result
+
+
+def test_command_line_default_branch():
+    branch = ""
+    with Remote() as remote, Pusher(remote) as pusher:
+        pusher.push_file('README.md', '1')
+        remotepath = "file://%s" % os.path.abspath(remote.path)
+        pusherpath = os.path.abspath(pusher.path)
+        subprocess_result = command_line_test_helper(remotepath, branch, pusherpath)
+    assert subprocess_result
+
+
+def test_command_line_non_existing_branch():
+    branch = "wrong"
+    with Remote() as remote, Pusher(remote) as pusher:
+        pusher.push_file('README.md', '1')
+        remotepath = "file://%s" % os.path.abspath(remote.path)
+        pusherpath = os.path.abspath(pusher.path)
+        subprocess_result = command_line_test_helper(remotepath, branch, pusherpath)
+    assert not subprocess_result
+
+
+def test_branch_exists():
+    with Remote() as remote, Pusher(remote) as pusher:
+        pusher.push_file('README.md', '1')
+        with Puller(remote, 'puller') as puller:
+            assert not puller.gp.branch_exists("wrong")
+            assert puller.gp.branch_exists("master")
+
+
+def test_exception_branch_exists():
+    with Remote() as remote, Pusher(remote) as pusher:
+        pusher.push_file('README.md', '1')
+        with Puller(remote, 'puller') as puller:
+            orig_url = puller.gp.git_url
+            puller.gp.git_url = ""
+            try:
+                puller.gp.branch_exists("wrong")
+            except Exception as e:
+                assert type(e) == ValueError
+            puller.gp.git_url = orig_url
+
+
+def test_resolve_default_branch():
+    with Remote() as remote, Pusher(remote) as pusher:
+        pusher.push_file('README.md', '1')
+        with Puller(remote, 'puller') as puller:
+            assert puller.gp.resolve_default_branch() == "master"
+
+
+def test_exception_resolve_default_branch():
+    with Remote() as remote, Pusher(remote) as pusher:
+        pusher.push_file('README.md', '1')
+        with Puller(remote, 'puller') as puller:
+            orig_url = puller.gp.git_url
+            puller.gp.git_url = ""
+            try:
+                puller.gp.resolve_default_branch()
+            except Exception as e:
+                assert type(e) == ValueError
+            puller.gp.git_url = orig_url
+
+
+def test_simple_push_pull():
+    """
+    Test the 'happy path' push/pull interaction
+
+    1. Push a file to remote, pull (initially) to make sure we get it
+    2. Modify file & push to remote, pull to make sure we get update
+    3. Add new file to remote, pull to make sure we get it
+    4. Delete new file to remote, pull to make sure it is gone
+
+    No modifications are done in the puller repo here, so we do not
+    exercise any merging behavior.
+    """
+    with Remote() as remote, Pusher(remote) as pusher:
+        pusher.push_file('README.md', '1')
+
+        with Puller(remote) as puller:
+            assert puller.git('rev-parse', 'HEAD') == pusher.git('rev-parse', 'HEAD')
+            assert puller.read_file('README.md') == pusher.read_file('README.md') == '1'
+
+            pusher.push_file('README.md', '2')
+            puller.pull_all()
+
+            assert puller.git('rev-parse', 'HEAD') == pusher.git('rev-parse', 'HEAD')
+            assert puller.read_file('README.md') == pusher.read_file('README.md') == '2'
+
+            pusher.push_file('another-file', '3')
+
+            puller.pull_all()
+
+            assert puller.git('rev-parse', 'HEAD') == pusher.git('rev-parse', 'HEAD')
+            assert puller.read_file('another-file') == pusher.read_file('another-file') == '3'
+
+            pusher.git('rm', 'another-file')
+            pusher.git('commit', '-m', 'Removing File')
+            pusher.git('push', 'origin', 'master')
+
+            puller.pull_all()
+
+            assert puller.git('rev-parse', 'HEAD') == pusher.git('rev-parse', 'HEAD')
+            assert not os.path.exists(os.path.join(puller.path, 'another-file'))
+
+
+def test_git_lock():
+    """
+    Test the 'happy path', but with stale/unstale git locks
+    """
+    with Remote() as remote, Pusher(remote) as pusher:
+        pusher.push_file('README.md', '1')
+
+        with Puller(remote) as puller:
+            pusher.push_file('README.md', '2')
+
+            puller.write_file('.git/index.lock', '')
+
+            exception_raised = False
+            try:
+                puller.pull_all()
+            except Exception:
+                exception_raised = True
+            assert exception_raised
+
+            new_time = time.time() - 700
+            os.utime(os.path.join(puller.path, '.git', 'index.lock'), (new_time, new_time))
+
+            puller.pull_all()
+            assert puller.git('rev-parse', 'HEAD') == pusher.git('rev-parse', 'HEAD')
+
+
+def test_merging_simple():
+    """
+    Test that when we change local & remote, local changes are preferred
+    """
+    with Remote() as remote, Pusher(remote) as pusher:
+        pusher.push_file('README.md', '1')
+
+        with Puller(remote) as puller:
+            assert puller.read_file('README.md') == pusher.read_file('README.md') == '1'
+
+            puller.write_file('README.md', '2')
+
+            pusher.push_file('README.md', '3')
+
+            puller.pull_all()
+
+            # There should be a commit made *before* the pull that has our explicit
+            # authorship, to record that it was made by nbgitpuller
+            assert puller.git('show', '-s', '--format="%an <%ae>"', 'HEAD^1') == '"nbgitpuller <nbgitpuller@nbgitpuller.link>"'
+
+            assert puller.read_file('README.md') == '2'
+            assert pusher.read_file('README.md') == '3'
+
+            # Make sure that further pushes to other files are reflected
+            pusher.push_file('another-file', '4')
+
+            puller.pull_all()
+
+            assert puller.read_file('another-file') == pusher.read_file('another-file') == '4'
+
+            # Make sure our merging works across commits
+
+            pusher.push_file('README.md', '5')
+            puller.pull_all()
+
+            assert puller.read_file('README.md') == '2'
+
+
+def test_untracked_puller():
+    """
+    Test that untracked files in puller are preserved when pulling
+    """
+    with Remote() as remote, Pusher(remote) as pusher:
+        pusher.push_file('README.md', '1')
+
+        with Puller(remote) as puller:
+            pusher.push_file('another-file', '2')
+
+            puller.write_file('another-file', '3')
+
+            puller.pull_all()
+            assert puller.read_file('another-file') == '2'
+            # Find file that was created!
+            renamed_file = glob.glob(os.path.join(puller.path, 'another-file_*'))[0]
+            assert puller.read_file(os.path.basename(renamed_file)) == '3'
+
+
+def test_reset_file():
+    """
+    Test that deleting files locally & pulling restores pristine copy
+    """
+    with Remote() as remote, Pusher(remote) as pusher:
+        pusher.push_file('README.md', '1')
+        pusher.push_file('unicode🙂.txt', '2')
+
+        with Puller(remote) as puller:
+            os.remove(os.path.join(puller.path, 'README.md'))
+            os.remove(os.path.join(puller.path, 'unicode🙂.txt'))
+
+            puller.pull_all()
+
+            assert puller.git('rev-parse', 'HEAD') == pusher.git('rev-parse', 'HEAD')
+            assert puller.read_file('README.md') == pusher.read_file('README.md') == '1'
+            assert puller.read_file('unicode🙂.txt') == pusher.read_file('unicode🙂.txt') == '2'
+
+
+@pytest.fixture(scope='module')
+def long_remote():
+    with Remote("long_remote") as remote, Pusher(remote, "lr_pusher") as pusher:
+        for i in range(0, 10):
+            pusher.git('commit', '--allow-empty', '-m', "Empty message %d" % i)
+            pusher.git('push', 'origin', 'master')
+
+        yield remote
+
+
+@pytest.fixture(scope="function")
+def clean_environment():
+    """
+    Save and restore the state of named VARIABLES before, during, and
+    after tests.
+    """
+
+    VARIABLES = ['NBGITPULLER_DEPTH']
+    backups = {}
+    for var in VARIABLES:
+        backups[var] = os.environ.get(var)
+        if backups[var]:
+            del os.environ[var]
+
+    yield
+
+    for var in backups:
+        if backups[var]:
+            os.environ[var] = backups[var]
+        elif os.environ.get(var):
+            del os.environ[var]
+
+
+def count_loglines(repository):
+    return len(repository.git('log', '--oneline').split("\n"))
+
+
+def test_unshallow_clone(long_remote, clean_environment):
+    """
+    Sanity-test that clones with 10 commits have 10 log entries
+    """
+    os.environ['NBGITPULLER_DEPTH'] = "0"
+    with Puller(long_remote, 'normal') as puller:
+        assert count_loglines(puller) == 10
+
+
+def test_shallow_clone(long_remote, clean_environment):
+    """
+    Test that shallow clones only have a portion of the git history
+    """
+    with Puller(long_remote, 'shallow4', depth=4) as puller:
+        assert count_loglines(puller) == 4
+
+
+def test_shallow_clone_config(long_remote, clean_environment):
+    """
+    Test that shallow clones can be configured via parent Configurables
+    """
+    class TempConfig(Configurable):
+        def __init__(self):
+            super(TempConfig)
+            self.config['GitPuller']['depth'] = 5
+
+    with Puller(long_remote, 'shallow4', parent=TempConfig()) as puller:
+        assert count_loglines(puller) == 5
+
+
+def test_environment_shallow_clone(long_remote, clean_environment):
+    """
+    Test that shallow clones respect the NBGITPULLER_DEPTH environment variable
+    by default
+    """
+    os.environ['NBGITPULLER_DEPTH'] = "2"
+    with Puller(long_remote, 'shallow_env') as puller:
+        assert count_loglines(puller) == 2
+
+
+def test_explicit_unshallow(long_remote, clean_environment):
+    """
+    Test that we can disable environment-specified shallow clones
+    """
+    os.environ['NBGITPULLER_DEPTH'] = "2"
+    with Puller(long_remote, 'explicitly_full', depth=0) as puller:
+        assert count_loglines(puller) == 10
+
+
+def test_pull_on_shallow_clone(long_remote, clean_environment):
+    """
+    Test that we can perform a pull on a shallow clone
+    """
+    with Puller(long_remote, depth=0) as shallow_puller:
+        with Pusher(long_remote) as pusher:
+            pusher.push_file('test_file', 'test')
+
+            orig_head = shallow_puller.git('rev-parse', 'HEAD')
+            shallow_puller.pull_all()
+            new_head = shallow_puller.git('rev-parse', 'HEAD')
+            upstream_head = long_remote.git('rev-parse', 'HEAD')
+
+            assert orig_head != new_head
+            assert new_head == upstream_head
+
+            pusher.git('push', '--force', 'origin', '%s:master' % orig_head)

nbgitpuller/webpack.config.js

+const webpack = require('webpack');
+
+module.exports = {
+    context: __dirname + "/nbgitpuller/static/",
+    entry: "./js/index.js",
+    output: {
+        path: __dirname + "/nbgitpuller/static/dist/",
+        filename: "bundle.js",
+        publicPath: '/static/dist/'
+    },
+    module: {
+        rules: [
+            {
+                test: /\.css$/i,
+                use: ['style-loader', 'css-loader']
+            },
+        ]
+    },
+    devtool: 'source-map',
+    plugins: [
+        new webpack.ProvidePlugin({
+            $: 'jquery',
+            jQuery: 'jquery',
+        }),
+    ]
+}

requirements.txt

 jupyterhub==1.4.2
-nbgitpuller==0.10.1
\ No newline at end of file
+# nbgitpuller==0.10.1
\ No newline at end of file