nixpkgs/maintainers/scripts/check-cherry-picks.sh

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#!/usr/bin/env bash
# Find alleged cherry-picks
set -e
if [ $# != "2" ] ; then
echo "usage: check-cherry-picks.sh base_rev head_rev"
exit 2
fi
PICKABLE_BRANCHES=${PICKABLE_BRANCHES:-master staging release-??.?? staging-??.??}
problem=0
while read new_commit_sha ; do
if [ -z "$new_commit_sha" ] ; then
continue # skip empty lines
fi
if [ "$GITHUB_ACTIONS" = 'true' ] ; then
echo "::group::Commit $new_commit_sha"
else
echo "================================================="
fi
git rev-list --max-count=1 --format=medium "$new_commit_sha"
echo "-------------------------------------------------"
original_commit_sha=$(
git rev-list --max-count=1 --format=format:%B "$new_commit_sha" \
| grep -Ei -m1 "cherry.*[0-9a-f]{40}" \
| grep -Eoi -m1 '[0-9a-f]{40}'
)
if [ "$?" != "0" ] ; then
echo " ? Couldn't locate original commit hash in message"
[ "$GITHUB_ACTIONS" = 'true' ] && echo ::endgroup::
continue
fi
set -f # prevent pathname expansion of patterns
for branch_pattern in $PICKABLE_BRANCHES ; do
set +f # re-enable pathname expansion
while read -r picked_branch ; do
if git merge-base --is-ancestor "$original_commit_sha" "$picked_branch" ; then
echo "$original_commit_sha present in branch $picked_branch"
range_diff_common='git range-diff
--no-notes
--creation-factor=100
'"$original_commit_sha~..$original_commit_sha"'
'"$new_commit_sha~..$new_commit_sha"'
'
if $range_diff_common --no-color | grep -E '^ {4}[+-]{2}' > /dev/null ; then
if [ "$GITHUB_ACTIONS" = 'true' ] ; then
echo ::endgroup::
echo -n "::warning ::"
else
echo -n " ⚠ "
fi
echo "Difference between $new_commit_sha and original $original_commit_sha may warrant inspection:"
$range_diff_common --color
echo "Note this should not necessarily be treated as a hard fail, but a reviewer's attention should" \
"be drawn to it and github actions have no way of doing that but to raise a 'failure'"
problem=1
else
echo "$original_commit_sha highly similar to $new_commit_sha"
$range_diff_common --color
[ "$GITHUB_ACTIONS" = 'true' ] && echo ::endgroup::
fi
# move on to next commit
continue 3
fi
done <<< "$(
git for-each-ref \
--format="%(refname)" \
"refs/remotes/origin/$branch_pattern"
)"
done
if [ "$GITHUB_ACTIONS" = 'true' ] ; then
echo ::endgroup::
echo -n "::error ::"
else
echo -n " ✘ "
fi
echo "$original_commit_sha not found in any pickable branch"
problem=1
done <<< "$(
git rev-list \
-E -i --grep="cherry.*[0-9a-f]{40}" --reverse \
"$1..$2"
)"
exit $problem