mirror-repos-branch

#!/bin/bash

# Mirroring a specific branch from the flatcar remote repos.
# Run it like:
#
#  ./mirror-repos-branch build-2010.0.1 flatcar-build-2010.0.1
#
# source = build-2010.0.1, destination = flatcar-build-2010.0.1

set -euo pipefail

ALL_REPOS=${ALL_REPOS:-0}
FORCE_MODE=${FORCE_MODE:-0}

if [ -z "$1" ] || [ "$1" == "-h" ] || [ "$1" == "--help" ] ; then
	echo "Usage:"
	echo "  $0 src-build-x.y.z dst-build-x.y.z"
	echo ""
	exit 1
fi

SRC_BUILD_BRANCH=$1
DST_BUILD_BRANCH=$2

PUSH_OPTIONS=""
if [ "${FORCE_MODE}" = "1" ]; then
  PUSH_OPTIONS+=" --force"
fi

. ./lib/common.sh

if [ "${ALL_REPOS}" = "0" ]; then
  FLATCAR_REPOS=("coreos-overlay" "portage-stable" "scripts")
fi

REPOS_DIR=$(mktemp -d "${PWD}/.mirror-repos.XXXXXXXXXX")
echo "Created new directory $REPOS_DIR"

# clean up
trap '{ export EXT="$?"; rm -rf "${REPOS_DIR}" && exit "${EXT}"; }' EXIT

cd "${REPOS_DIR}"

# Check if we are in the monorepo case
[ ! -d scripts ] && git clone --recurse-submodules "git@github.com:flatcar/scripts"
if [ "$(git -C scripts show "origin/${SRC_BUILD_BRANCH}":.gitmodules 2>/dev/null)" = "" ]; then
  FLATCAR_REPOS=("scripts")
fi

for repo in "${FLATCAR_REPOS[@]}"; do
  # Note: systemd repo has neither flatcar-build-* branches nor flatcar-master
  # branch. So we should skip systemd completely.
  if [ "${repo}" = "systemd" ]; then
    continue
  fi

  HEAD_URL="git@github.com:flatcar/${repo}"

  [ ! -d "${repo}" ] && git clone --recurse-submodules "${HEAD_URL}"

  pushd "${repo}"

  src_branch=""
  if [ -n "$(git ls-remote --heads "${HEAD_URL}" "${SRC_BUILD_BRANCH}")" ]; then
    src_branch=${SRC_BUILD_BRANCH}
  else
    src_branch="flatcar-master"
  fi

  echo "Mirroring a branch ${src_branch} to ${DST_BUILD_BRANCH}"
  git checkout --recurse-submodules --force -B "${DST_BUILD_BRANCH}" "origin/${src_branch}"
  git push ${PUSH_OPTIONS} origin "${DST_BUILD_BRANCH}"

  popd
done