blob: d2d9a8447364bf2d5e42cffb35f1aa8a32c4ac5b (
plain)
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set -e
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.tmp" && mv "$out.tmp" "$out"
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