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#!/usr/bin/env bash
set -e -o pipefail
if [ "$#" -eq 0 ]; then
printf 'Usage: %s <origin> <branch> <branch> ...\n' "$(basename "$0")"
exit 0;
fi
REMOTE="$1"
if ! git ls-remote --exit-code "${REMOTE}" > /dev/null 2>&1; then
echo >&2 "Remote '${REMOTE}' is not valid."
exit 1;
fi
if [ "$#" -lt 3 ]; then
echo >&2 "You must specify at least two branchs to push."
exit 1;
fi
if ! git diff-index --quiet HEAD -- ; then
echo >&2 "Found uncommitted changes in working copy."
exit 1;
fi
ATOMIC_COMMIT_DATE="$(date)"
for BRANCH in "${@:2}"
do
echo "Validating branch '${BRANCH}'..."
# Vailidate that script arguments are valid local branch names
if ! git show-ref --verify --quiet "refs/heads/${BRANCH}"; then
echo >&2 "No such branch named '${BRANCH}'."
exit 1;
fi
# Pull and rebase all branches to ensure we've incorporated any new upstream commits
git checkout --quiet ${BRANCH}
git pull "${REMOTE}" --rebase --quiet
PENDING_COMMITS=$(git log ${REMOTE}/${BRANCH}..HEAD --oneline | grep "^.*$" -c || true)
# Ensure that there is exactly 1 unpushed commit in the branch
if [ "${PENDING_COMMITS}" -ne 1 ]; then
echo >&2 "Expected exactly 1 pending commit for branch '${BRANCH}' but ${PENDING_COMMITS} exist."
exit 1;
fi
# Amend HEAD commit to ensure all branch commit dates are the same
GIT_COMMITTER_DATE="${ATOMIC_COMMIT_DATE}" git commit --amend --no-edit --quiet
done
echo "Pushing to remote '${REMOTE}'..."
git push --atomic "${REMOTE}" "${@:2}"
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