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#!/usr/bin/env bash
#
# The following snippet can be used to WARN about a missing signed-off-by line
# in commits when pushing
#
# Aborting the push is possible
#
remote="$1"
url="$2"
z40=0000000000000000000000000000000000000000
while read local_ref local_sha remote_ref remote_sha
do
if [ "$local_sha" = $z40 ]
then
# Branch is deleted, nothing to check here, move along.
else
if [ "$remote_sha" = $z40 ]
then
# New branch, examine all commits
range="$local_sha"
else
# Update to existing branch, examine new commits
range="$remote_sha..$local_sha"
fi
if [ "$remote_sha" = $z40 ]; then
# New branch is pushed, we only want to check commits that are not
# on master.
range="$(git merge-base master "$local_sha")..$local_sha"
fi
while read ref; do
msg=$(git log -n 1 --format=%B "$ref")
if ! grep -q '^Signed-off-by: ' <<<"$msg"; then
echo >&2 "Unsigned commit $ref"
# TO NOT ONLY WARN BUT ABORT UNCOMMENT THE NEXT LINE
# exit 1
fi
done < <(git rev-list "$range")
# The process substitution above is a hack to make sure loop runs in
# the same shell and can actually exit the whole script.
fi
done
exit 0
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