run-ci: add option to run python3 tests with 2to3

debian/run-ci

@@ -34,6 +34,14 @@ fi
 
 export RUN_COVERAGE
 
+if [ "x$1" = "x--python3" ]; then
+    DAK_PYTHON3=y
+else
+    DAK_PYTHON3=
+fi
+
+export DAK_PYTHON3
+
 set -eu
 
 if [ ! -f dak/dak.py ]; then
@@ -44,4 +52,59 @@ fi
 run_apt-get update
 run_apt-get install -y build-essential
 run_apt-get build-dep -y .
-dpkg-buildpackage -b
+
+if [ "x$DAK_PYTHON3" = "x" ]; then
+    dpkg-buildpackage -b
+else
+    run_apt-get install -y --no-install-recommends \
+        2to3 \
+        python3-coverage \
+        python3-debian \
+        python3-debianbts \
+        python3-ldap \
+        python3-psycopg2 \
+        python3-pytest \
+        python3-pytest-cov \
+        python3-rrdtool \
+        python3-sqlalchemy \
+        python3-tabulate \
+        python3-yaml \
+        python3-apt \
+
+
+cleanup-newroot() {
+  if [[ -v DAK_NEWROOT ]]; then
+    rm -rf -- "${DAK_NEWROOT}"
+  fi
+}
+
+    export DAK_NEWROOT=$(mktemp -d)
+    trap cleanup-newroot EXIT
+    export DAK_ROOT=$DAK_NEWROOT
+    export BASEDIR="$(cd $(dirname "${BASH_SOURCE}")/..; pwd)"
+    for dir in dak daklib
+    do
+        cp -a ${BASEDIR}/${dir}/ ${DAK_ROOT}/${dir}
+        2to3 -wn -x future -x import ${DAK_ROOT}/${dir}
+    done
+    for filename in tests integration-tests setup templates .coveragerc
+    do
+        ln -s ${BASEDIR}/${filename} ${DAK_ROOT}/${filename}
+    done
+
+    mkdir -p $DAK_ROOT/test-gnupghome
+    export GNUPGHOME=${DAK_ROOT}/test-gnupghome
+
+    cd ${DAK_ROOT}
+
+    PYTEST_COV_OPTIONS=" --cov-branch --cov --cov-report= "
+    py.test-3 -v ${PYTEST_COV_OPTIONS} daklib tests
+
+    make -C tests/fixtures/packages
+
+    ./integration-tests/run-tests
+    python3-coverage combine --append
+    python3-coverage report -m
+    echo
+    python3-coverage html -d ${BASEDIR}/coverage
+fi