blob: 1d4124a7de6c4b50f0db8f03988793e943411f4f (
plain)
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set -e
if [ "$#" != 4 ] ; then
echo 'usage: commit.sh repo branch tag out' >&2
exit 2
fi
repo=$1
branch=$2
tag=$3
out=$4
if commit=$(git -C "$repo" show-ref -s --verify "refs/heads/$branch" 2>/dev/null) ; then
oldtree=$(git -C "$repo" rev-parse --verify "$branch^{tree}")
newtree=$(git -C "$repo" rev-parse --verify "$tag^{tree}")
if [ "$oldtree" != "$newtree" ] ; then
set -- -p "$branch"
unset commit
fi
else
set --
unset commit
fi
if [ -z "${commit+set}" ] ; then
commit=$(git -C "$repo" commit-tree -m "oasis $(git rev-parse --short=10 HEAD)" "$@" "$tag")
git -C "$repo" update-ref "refs/heads/$branch" "$commit"
fi
echo "$commit" >"$out"
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