push-updates.sh

#!/bin/bash
#
# Copyright 2018 Delphix
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

TOP="$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")"
source "$TOP/lib/common.sh"

logmust check_running_system

function usage() {
	[[ $# != 0 ]] && echo "$(basename "$0"): $*"
	echo "Usage: $(basename "$0") -m|-u [-ny] [-g target_git_url]"
	echo "         [-b target_git_branch] package"
	echo ""
	echo "  This script pushes updates generated by 'buildpkg.sh -u' to the"
	echo "  default remote for the package. The updates should be present"
	echo "  in 'packages/<package>/tmp/repo', in branch repo-HEAD for the merge"
	echo "  branch and upstream-HEAD for the upstream branch."
	echo "  Options:"
	echo ""
	echo "    -u  push updates for the upstream branch"
	echo "    -m  push updates for the merge branch"
	echo "    -g  repository to push to. Defaults to value of"
	echo "        DEFAULT_PACKAGE_GIT_URL for the package."
	echo "    -b  branch to push to. Defaults to 'master' when passing -m"
	echo "        or to $REPO_UPSTREAM_BRANCH when passing -u."
	echo "    -n  dry-run. Pass the dry-run flag to git push (git push -n)."
	echo "    -y  do not prompt for confirmation before pushing."
	echo "    -h  display this message and exit."
	echo ""
	exit 2
}

unset TARGET_GIT_URL
unset TARGET_GIT_BRANCH

do_push_merge=false
do_push_upstream=false
do_ask=true
dry_run=false
while getopts ':b:g:hmnuy' c; do
	case "$c" in
	b) TARGET_GIT_BRANCH="$OPTARG" ;;
	g) TARGET_GIT_URL="$OPTARG" ;;
	m) do_push_merge=true ;;
	u) do_push_upstream=true ;;
	n) dry_run=true ;;
	y) do_ask=false ;;
	h) usage >&2 ;;
	*) usage "illegal option -- $OPTARG" >&2 ;;
	esac
done
shift $((OPTIND - 1))
[[ $# -lt 1 ]] && usage "package argument missing" >&2
[[ $# -gt 1 ]] && usage "too many arguments" >&2
PACKAGE=$1

if $do_push_merge && $do_push_upstream; then
	usage "-m and -u are exclusive." >&2
elif ! ($do_push_merge || $do_push_upstream); then
	usage "must pass either -m or -u." >&2
fi

query_git_credentials

logmust check_package_exists "$PACKAGE"
PKGDIR="$TOP/packages/$PACKAGE"
WORKDIR="$PKGDIR/tmp"

if [[ -z "$TARGET_GIT_URL" ]]; then
	#
	# load the package's config just so that we can retrieve
	# DEFAULT_PACKAGE_GIT_URL.
	#
	logmust load_package_config "$PACKAGE"
	check_env DEFAULT_PACKAGE_GIT_URL
	TARGET_GIT_URL="$DEFAULT_PACKAGE_GIT_URL"
	echo "TARGET_GIT_URL set to DEFAULT_PACKAGE_GIT_URL"
fi

if [[ -z "$TARGET_GIT_BRANCH" ]]; then
	if $do_push_merge; then
		TARGET_GIT_BRANCH="master"
		echo "TARGET_GIT_BRANCH defaults to 'master' for merge pushes."
	else
		TARGET_GIT_BRANCH="$REPO_UPSTREAM_BRANCH"
		echo "TARGET_GIT_BRANCH defaults to '$REPO_UPSTREAM_BRANCH' for" \
			"upstream pushes."
	fi
fi

[[ "$TARGET_GIT_URL" == https://* ]] ||
	die "Target git url must begin with https://"

git_url_with_creds="${TARGET_GIT_URL/https:\/\//https:\/\/${PUSH_GIT_USER}:${PUSH_GIT_PASSWORD}@}"
git_url_with_fake_creds="${TARGET_GIT_URL/https:\/\//https:\/\/<user>:<password>@}"

if $do_push_merge; then
	ref="refs/heads/repo-HEAD"
	check_updated="$WORKDIR/repo-updated"
else
	ref="refs/heads/upstream-HEAD"
	check_updated="$WORKDIR/upstream-updated"
fi

[[ -f "$check_updated" ]] ||
	die "$check_updated is missing, aborting push."

logmust cd "$WORKDIR/repo"
check_git_ref "$ref"

if $do_ask; then
	echo_bold "WARNING: You are about to push to branch" \
		"$TARGET_GIT_BRANCH of $TARGET_GIT_URL."
	read -rp "Do you want to proceed (y/[n])? "
	if [[ "$REPLY" != "y" ]]; then
		echo "Push aborted by user."
		exit 1
	fi
fi

flags=""
$dry_run && flags="-n"
echo "Running: git push $flags $git_url_with_fake_creds $ref:$TARGET_GIT_BRANCH"
git push $flags "$git_url_with_creds" "$ref:$TARGET_GIT_BRANCH" ||
	die "Push failed."