tox: make it possible to run pep8 on current patch only

The 'tox -epep8' command takes a long time as it checks
every single file in the Nova git repository (~1,400 at
time of writing).

This makes tox use a simple wrapper around flake8 which
can be told to restrict the check to only files changed
in the current command. This can be invoked in a simple
manner with 'tox -epep8 -- -HEAD'. Since most commits
only touch a handful of files, this will usually be
far faster than checking all 1,400 source files.

To check an entire branch for bisectability it can be
automated via

  git rebase -i master -x 'tox -epep8 -- -HEAD'

Change-Id: I157d1ccb883ca02402eee51fd7d6a50f86079389
Daniel P. Berrange 8 years ago
parent 0d696adcea
commit a7471dd773

@ -0,0 +1,20 @@
# A simple wrapper around flake8 which makes it possible
# to ask it to only verify files changed in the current
# git HEAD patch.
# Intended to be invoked via tox:
# tox -epep8 -- -HEAD
if test "x$1" = "x-HEAD" ; then
files=$(git diff --name-only HEAD~1 | tr '\n' ' ')
echo "Running flake8 on ${files}"
diff -u --from-file /dev/null ${files} | flake8 --diff "$@"
echo "Running flake8 on all files"
exec flake8 "$@"

@ -27,7 +27,7 @@ downloadcache = ~/cache/pip
commands =
flake8 {posargs}
bash tools/ {posargs}
setenv = {[testenv]setenv}