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flake8_diff.sh
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flake8_diff.sh
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#!/bin/bash
# Copyright: 2017, Loic Esteve
# License: BSD 3 clause
# This script is used in Travis to check that PRs do not add obvious
# flake8 violations. It relies on two things:
# - computing a similar diff to what github is showing in a PR. The
# diff is done between:
# 1. the common ancestor of the local branch and the
# sardana-org/sardana remote
# 2. the local branch
# - run flake8 --diff --show-source on the computed diff
#
# Additional features:
# - the line numbers in Travis match the local branch on the PR
# author machine.
# - bash ci/flake8_diff.sh can be run locally for quick turn-around
# (and it accepts additional flake8 options)
#
# Known problems:
# - Adding a new line on top of the standard two lines between two functions
# won't result in a failure. The reason for this is that we do a diff
# without a context to avoid getting failures for PEP8 violations that
# already exist. Without seeing the context you can not tell that the
# additional new line is a PEP8 violation. This happens only if the
# offending line was added on the boundary of the diff chunk.
# exit script if any of the subsequent commands fails
set -o errexit
# pipefail is necessary to propagate exit codes
set -o pipefail
PROJECT=sardana-org/sardana
PROJECT_URL=https://github.com/$PROJECT.git
# Find the remote with the project name (upstream in most cases)
REMOTE=$(git remote -v | grep $PROJECT | cut -f1 | head -1 || echo '')
# Add a temporary remote if needed. For example this is necessary when
# Travis is configured to run in a fork. In this case 'origin' is the
# fork and not the reference repo we want to diff against.
if [[ -z "$REMOTE" ]]; then
TMP_REMOTE=tmp_reference_upstream
REMOTE=$TMP_REMOTE
git remote add $REMOTE $PROJECT_URL
fi
echo "Remotes:"
echo '--------------------------------------------------------------------------------'
git remote --verbose
# Travis does the git clone with a limited depth (50 at the time of
# writing). This may not be enough to find the common ancestor with
# $REMOTE/develop so we unshallow the git checkout
if [[ -a .git/shallow ]]; then
echo -e '\nTrying to unshallow the repo:'
echo '--------------------------------------------------------------------------------'
git fetch --unshallow
fi
if [[ "$TRAVIS" == "true" ]]; then
if [[ "$TRAVIS_PULL_REQUEST" == "false" ]]
then
# In main repo, using TRAVIS_COMMIT_RANGE to test the commits
# that were pushed into a branch
if [[ "$PROJECT" == "$TRAVIS_REPO_SLUG" ]]; then
if [[ -z "$TRAVIS_COMMIT_RANGE" ]]; then
echo "New branch, no commit range from Travis so passing this test by convention"
exit 0
fi
COMMIT_RANGE=$TRAVIS_COMMIT_RANGE
fi
else
# We want to fetch the code as it is in the PR branch and not
# the result of the merge into develop. This way line numbers
# reported by Travis will match with the local code.
LOCAL_BRANCH_REF=travis_pr_$TRAVIS_PULL_REQUEST
# In Travis the PR target is always origin
git fetch origin pull/$TRAVIS_PULL_REQUEST/head:refs/$LOCAL_BRANCH_REF
fi
fi
# If not using the commit range from Travis we need to find the common
# ancestor between $LOCAL_BRANCH_REF and $REMOTE/develop
if [[ -z "$COMMIT_RANGE" ]]; then
if [[ -z "$LOCAL_BRANCH_REF" ]]; then
LOCAL_BRANCH_REF=$(git rev-parse --abbrev-ref HEAD)
fi
echo -e "\nLast 2 commits in $LOCAL_BRANCH_REF:"
echo '--------------------------------------------------------------------------------'
git log -2 $LOCAL_BRANCH_REF
REMOTE_DEVELOP_REF="$REMOTE/develop"
# Make sure that $REMOTE_DEVELOP_REF is a valid reference
echo -e "\nFetching $REMOTE_DEVELOP_REF"
echo '--------------------------------------------------------------------------------'
git fetch $REMOTE develop:refs/remotes/$REMOTE_DEVELOP_REF
LOCAL_BRANCH_SHORT_HASH=$(git rev-parse --short $LOCAL_BRANCH_REF)
REMOTE_DEVELOP_SHORT_HASH=$(git rev-parse --short $REMOTE_DEVELOP_REF)
# Very confusing: need to use '..' i.e. two dots for 'git
# rev-list' but '...' i.e. three dots for 'git diff'
DIFF_RANGE="$REMOTE_DEVELOP_SHORT_HASH...$LOCAL_BRANCH_SHORT_HASH"
REV_RANGE="$REMOTE_DEVELOP_SHORT_HASH..$LOCAL_BRANCH_SHORT_HASH"
echo -e '\nRunning flake8 on the diff in the range'\
"$DIFF_RANGE ($(git rev-list $REV_RANGE | wc -l) commit(s)):"
echo '--------------------------------------------------------------------------------'
else
echo "Got the commit range from Travis: $COMMIT_RANGE"
fi
# Remove temporary remote only if it was previously added.
if [[ -n "$TMP_REMOTE" ]]; then
git remote remove $TMP_REMOTE
fi
# We ignore all non python files.
# We need the following command to exit with 0 hence the echo in case
# there is no match
MODIFIED_FILES=$(git diff --name-only $DIFF_RANGE | \
grep -e "\.py$" || echo "no_match")
if [[ "$MODIFIED_FILES" == "no_match" ]]; then
echo "No python files have been modified"
else
# temporarily mask the errexit option cause we want to capture the exit
# code and print a dedicated output
set +o errexit
# Conservative approach: diff without context so that code that
# was not changed does not create failures
git diff --unified=0 $DIFF_RANGE -- $MODIFIED_FILES | flake8 --diff --show-source "$@"
RET=$?
# exit script if any of the subsequent commands fails
set -o errexit
if [ $RET -eq 0 ]; then
echo -e "No problem detected by flake8\n"
else
echo '--------------------------------------------------------------------------------'
echo "autopep8 tool may be useful in fixing these errors."
echo -e "More information on: https://pypi.python.org/pypi/autopep8.\n"
echo "Also remember that ci/flake8_diff.sh can be run locally for quick turn-around"
echo -e "(you will need flake8 installed) - just commit your changes and run the script.\n"
exit $RET
fi
fi