More tests for wildmatch functions.

* ab/wildmatch-tests:
  wildmatch test: mark test as EXPENSIVE_ON_WINDOWS
  test-lib: add an EXPENSIVE_ON_WINDOWS prerequisite
  wildmatch test: create & test files on disk in addition to in-memory
  wildmatch test: perform all tests under all wildmatch() modes
  wildmatch test: use test_must_fail, not ! for test-wildmatch
  wildmatch test: remove dead fnmatch() test code
  wildmatch test: use a paranoia pattern from nul_match()
  wildmatch test: don't try to vertically align our output
  wildmatch test: use more standard shell style
  wildmatch test: indent with tabs, not spaces

Conversion from uchar[20] to struct object_id continues.

* po/object-id:
  sha1_file: rename hash_sha1_file_literally
  sha1_file: convert write_loose_object to object_id
  sha1_file: convert force_object_loose to object_id
  sha1_file: convert write_sha1_file to object_id
  notes: convert write_notes_tree to object_id
  notes: convert combine_notes_* to object_id
  commit: convert commit_tree* to object_id
  match-trees: convert splice_tree to object_id
  cache: clear whole hash buffer with oidclr
  sha1_file: convert hash_sha1_file to object_id
  dir: convert struct sha1_stat to use object_id
  sha1_file: convert pretend_sha1_file to object_id

"git pull --rebase" did not pass verbosity setting down when
recursing into a submodule.

* sb/pull-rebase-submodule:
  builtin/pull: respect verbosity settings in submodules

Avoid mmapping small files while using packed refs (especially ones
with zero size, which would cause later munmap() to fail).

* kg/packed-ref-cache-fix:
  packed_ref_cache: don't use mmap() for small files
  load_contents(): don't try to mmap an empty file
  packed_ref_iterator_begin(): make optimization more general
  find_reference_location(): make function safe for empty snapshots
  create_snapshot(): use `xmemdupz()` rather than a strbuf
  struct snapshot: store `start` rather than `header_len`

Plug recently introduced leaks in fsck.

* jt/fsck-code-cleanup:
  fsck: fix leak when traversing trees

* en/merge-recursive-fixes:
  merge-recursive: add explanation for src_entry and dst_entry
  merge-recursive: fix logic ordering issue
  Tighten and correct a few testcases for merging and cherry-picking

Error message fix.

* jc/worktree-add-short-help:
  worktree: say that "add" takes an arbitrary commit in short-help

Push the submodule version of collision-detecting SHA-1 hash
implementation a bit harder on builders.

* ab/sha1dc-build:
  sha1dc_git.h: re-arrange an ifdef chain for a subsequent change
  Makefile: under "make dist", include the sha1collisiondetection submodule
  Makefile: don't error out under DC_SHA1_EXTERNAL if DC_SHA1_SUBMODULE=auto

Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Doc update.

* tz/doc-show-defaults-to-head:
  doc: mention 'git show' defaults to HEAD

Workaround for segfault with more recent versions of SVN.

* ew/svn-branch-segfault-fix:
  git-svn: control destruction order to avoid segfault

Travis updates.

* sg/travis-linux32-sanity:
  travis-ci: don't fail if user already exists on 32 bit Linux build job
  travis-ci: don't run the test suite as root in the 32 bit Linux build
  travis-ci: don't repeat the path of the cache directory
  travis-ci: use 'set -e' in the 32 bit Linux build job
  travis-ci: use 'set -x' for the commands under 'su' in the 32 bit Linux build

Completion of "git merge -s<strategy>" (in contrib/) did not work
well in non-C locale.

* nd/list-merge-strategy:
  completion: fix completing merge strategies on non-C locales

Doc updates.

* jt/long-running-process-doc:
  Docs: split out long-running subprocess handshake

Assorted fixes to "git daemon".

* jk/daemon-fixes:
  daemon: fix length computation in newline stripping
  t/lib-git-daemon: add network-protocol helpers
  daemon: handle NULs in extended attribute string
  daemon: fix off-by-one in logging extended attributes
  t/lib-git-daemon: record daemon log
  t5570: use ls-remote instead of clone for interp tests

The sequencer infrastructure is shared across "git cherry-pick",
"git rebase -i", etc., and has always spawned "git commit" when it
needs to create a commit.  It has been taught to do so internally,
when able, by reusing the codepath "git commit" itself uses, which
gives performance boost for a few tens of percents in some sample
scenarios.

* pw/sequencer-in-process-commit:
  sequencer: run 'prepare-commit-msg' hook
  t7505: add tests for cherry-pick and rebase -i/-p
  t7505: style fixes
  sequencer: assign only free()able strings to gpg_sign
  sequencer: improve config handling
  t3512/t3513: remove KNOWN_FAILURE_CHERRY_PICK_SEES_EMPTY_COMMIT=1
  sequencer: try to commit without forking 'git commit'
  sequencer: load commit related config
  sequencer: simplify adding Signed-off-by: trailer
  commit: move print_commit_summary() to libgit
  commit: move post-rewrite code to libgit
  Add a function to update HEAD after creating a commit
  commit: move empty message checks to libgit
  t3404: check intermediate squash messages

Code clean-up.

* nd/shared-index-fix:
  read-cache: don't write index twice if we can't write shared index
  read-cache.c: move tempfile creation/cleanup out of write_shared_index
  read-cache.c: change type of "temp" in write_shared_index()

Debugging aid.

* po/http-push-error-message:
  http-push: improve error log

Prevent "clang-format" from breaking line after function return type.

* po/clang-format-functype-weight:
  clang-format: adjust penalty for return type line break

Corner case bugfix.

* jc/mailinfo-cleanup-fix:
  mailinfo: avoid segfault when can't open files

Code clean-up.

* sg/cocci-move-array:
  Use MOVE_ARRAY

The split-index mode had a few corner case bugs fixed.

* tg/split-index-fixes:
  travis: run tests with GIT_TEST_SPLIT_INDEX
  split-index: don't write cache tree with null oid entries
  read-cache: fix reading the shared index for other repos

Update Coccinelle rules to catch and optimize strbuf_addf(&buf, "%s", str)

* rs/strbuf-cocci-workaround:
  cocci: use format keyword instead of a literal string

Crash fix for a corner case where an error codepath tried to unlock
what it did not acquire lock on.

* mr/packed-ref-store-fix:
  files_initial_transaction_commit(): only unlock if locked

The http tracing code, often used to debug connection issues,
learned to redact potentially sensitive information from its output
so that it can be more safely sharable.

* jt/http-redact-cookies:
  http: support omitting data from traces
  http: support cookie redaction when tracing

Code clean-up.

* ds/use-get-be64:
  packfile: use get_be64() for large offsets

Code clean-up.

* cc/sha1-file-name:
  sha1_file: improve sha1_file_name() perfs
  sha1_file: remove static strbuf from sha1_file_name()

The tracing machinery learned to report tweaking of environment
variables as well.

* nd/trace-with-env:
  run-command.c: print new cwd in trace_run_command()
  run-command.c: print env vars in trace_run_command()
  run-command.c: print program 'git' when tracing git_cmd mode
  run-command.c: introduce trace_run_command()
  trace.c: move strbuf_release() out of print_trace_line()
  trace: avoid unnecessary quoting
  sq_quote_argv: drop maxlen parameter

Rewrite two more "git submodule" subcommands in C.

* pc/submodule-helper:
  submodule: port submodule subcommand 'deinit' from shell to C
  submodule: port submodule subcommand 'sync' from shell to C

Code clean-up.

* rb/hashmap-h-compilation-fix:
  hashmap.h: remove unused variable

Avoid showing a warning message in the middle of a line of "git
diff" output.

* nd/diff-flush-before-warning:
  diff.c: flush stdout before printing rename warnings

Code clean-up.

* tb/crlf-conv-flags:
  convert_to_git(): safe_crlf/checksafe becomes int conv_flags

Code clean-up.

* rs/describe-unique-abbrev:
  describe: use strbuf_add_unique_abbrev() for adding short hashes

Doc updates.

* ks/submodule-doc-updates:
  Doc/git-submodule: improve readability and grammar of a sentence
  Doc/gitsubmodules: make some changes to improve readability and syntax

Test clean-up.

* cl/t9001-cleanup:
  t9001: use existing helper in send-email test

Retire mru API as it does not give enough abstraction over
underlying list API to be worth it.

* gs/retire-mru:
  mru: Replace mru.[ch] with list.h implementation

The first step to getting rid of mru API and using the
doubly-linked list API directly instead.

* ot/mru-on-list:
  mru: use double-linked list from list.h

The machinery to clone & fetch, which in turn involves packing and
unpacking objects, have been told how to omit certain objects using
the filtering mechanism introduced by the jh/object-filtering
topic, and also mark the resulting pack as a promisor pack to
tolerate missing objects, taking advantage of the mechanism
introduced by the jh/fsck-promisors topic.

* jh/partial-clone:
  t5616: test bulk prefetch after partial fetch
  fetch: inherit filter-spec from partial clone
  t5616: end-to-end tests for partial clone
  fetch-pack: restore save_commit_buffer after use
  unpack-trees: batch fetching of missing blobs
  clone: partial clone
  partial-clone: define partial clone settings in config
  fetch: support filters
  fetch: refactor calculation of remote list
  fetch-pack: test support excluding large blobs
  fetch-pack: add --no-filter
  fetch-pack, index-pack, transport: partial clone
  upload-pack: add object filtering for partial clone

In preparation for implementing narrow/partial clone, the machinery
for checking object connectivity used by gc and fsck has been
taught that a missing object is OK when it is referenced by a
packfile specially marked as coming from trusted repository that
promises to make them available on-demand and lazily.

* jh/fsck-promisors:
  gc: do not repack promisor packfiles
  rev-list: support termination at promisor objects
  sha1_file: support lazily fetching missing objects
  introduce fetch-object: fetch one promisor object
  index-pack: refactor writing of .keep files
  fsck: support promisor objects as CLI argument
  fsck: support referenced promisor objects
  fsck: support refs pointing to promisor objects
  fsck: introduce partialclone extension
  extension.partialclone: introduce partial clone extension

The build procedure for perl/ part has been greatly simplified by
weaning ourselves off of MakeMaker.

* ab/simplify-perl-makefile:
  perl: treat PERLLIB_EXTRA as an extra path again
  perl: avoid *.pmc and fix Error.pm further
  Makefile: replace perl/Makefile.PL with simple make rules