git-docker/rootfs/usr/local/bin/clone-commit

#!/bin/bash

set -x

FLAGS=""
if [[ -n "${PLUGIN_DEPTH}" ]]; then
	FLAGS="--depth=${PLUGIN_DEPTH}"
fi

if [ ! -d .git ]; then
	git init
	git remote add origin "${DRONE_REMOTE_URL}"
fi

# the branch may be empty for certain event types,
# such as github deployment events. If the branch
# is empty we checkout the sha directly. Note that
# we intentially omit depth flags to avoid failed
# clones due to lack of history.
if [[ -z "${DRONE_COMMIT_BRANCH}" ]] && [[ -n "${DRONE_COMMIT_SHA}" ]]; then
	set -e
	set -x
	git fetch origin
	git checkout --quiet --force "${DRONE_COMMIT_SHA}"
	exit 0
fi

# the commit sha may be empty for builds that are
# manually triggered in Harness CI Enterprise. If
# the commit is empty we clone the branch.
if [[ -n "${DRONE_COMMIT_BRANCH}" ]] && [[ -z "${DRONE_COMMIT_SHA}" ]]; then
	set -e
	set -x
	git fetch "${FLAGS}" origin "+refs/heads/${DRONE_COMMIT_BRANCH}:refs/remotes/origin/${DRONE_COMMIT_BRANCH}"
	git checkout -b "${DRONE_COMMIT_BRANCH}" "refs/remotes/origin/${DRONE_COMMIT_BRANCH}"
	exit 0
fi

# if the commit sha and branch name not empty, fetch the branch even if a
# fast-forward is not possible. Checkout the specified commit sha which must be
# part of the branch.
set -e
set -x
git fetch "${FLAGS}" origin "+refs/heads/${DRONE_COMMIT_BRANCH}:refs/remotes/origin/${DRONE_COMMIT_BRANCH}"
git checkout "${DRONE_COMMIT_SHA}" -b "refs/remotes/origin/${DRONE_COMMIT_BRANCH}"