setup_project.sh

#!/bin/bash
# Copyright 2020 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Setup a project.

# Exit if any command fails.
set -e

function bail() {
  echo "${1}"
  exit 1
}

function prompt_continue() {
  read -r -p "${1} (y/N) " answer

  if [[ "${answer^^}" != "Y" ]]; then
    exit 0
  fi
}

function usage() {
  echo "Usage: $0 <program> <project> [<branch>]" >&2
  echo "  optionally pass branch to sync the project" >&2
  echo "  from the local manifest at the given branch." >&2
  exit 1
}

# Clone a repo and create a symlink a local manifest.
#
# Args:
#   $1: URL to clone.
#   $2: Path to clone to.
#   $3: Path to symlink to.
function clone_manifest() {
  [[ $# -eq 3 ]] || die "${FUNCNAME[0]}: takes three arguments"

  local clone_url=$1
  local clone_src=$2
  local symlink=$3

  if [[ -d "${clone_src}" ]]; then
    # If ${clone_src} is already present the user is likely running
    # a second time when their first run failed. Users would do this
    # when they found they didn't have adequate permissions on a first
    # run. In this case we wipe the artifacts from the previous run and
    # try again.
    prompt_continue "
${clone_src} appears to already exist. If you are
attempting to recover from a previous failed setup_project.sh attempt
this will attempt to fix it by removing it and resyncing. If you have
unsaved changes in ${clone_src} they will be lost.
Do you want to continue with the removal and resync?"

    echo "Found existing ${clone_src} checkout, removing."
    rm -rf "${clone_src}"
    rm -f "${symlink}"
  fi

  # We only need the local_manifest.xml but have to clone to get it.
  # Removing the rest of what we clone before we do the sync prevents
  # a confusing error message from being shown to the user. The
  # --force-sync below actually causes it to not be a problem, but we'd
  # rather avoid the user having to interpret the error.
  if [[ -z "${branch}" ]]; then
    git clone "${clone_url}" "${clone_src}"
  else
    git clone "${clone_url}" "${clone_src}" --branch "${branch}"
  fi

  find "${clone_src}" -mindepth 1 ! -name local_manifest.xml -exec rm -rf {} +

  if [[ ! -d  "${local_manifests_dir}" ]]; then
    mkdir -p "${local_manifests_dir}"
  fi

  local_manifest="${clone_src}/local_manifest.xml"
  if [[ ! -e "${local_manifest}" ]]; then
    return 1
  fi

  ln -sr "${local_manifest}" "${symlink}"
}

function main() {
  if [[ $# -lt 2 ]]; then
    usage
  fi

  readonly program="${1}"
  readonly project="${2}"
  readonly branch="${3}"

  prompt_continue "
If you are a googler and are working with an internal checkout you do
not need to run this script as you already have a full repo checkout.
Do you want to continue running this script?"

  # Move to this script's directory.
  cd "$(dirname "$0")"

  readonly local_manifests_dir="../../.repo/local_manifests"

  # Clone local manifests from the program and project. Program local manifest
  # is optional, project local manifest is required.
  #
  # Note that the symlinks include "_[program|project].xml" because the project
  # name may be the same as the program name.
  readonly prog_url="https://chrome-internal.googlesource.com/chromeos/program/${program}"
  readonly prog_src="../../src/program/${program}"
  readonly prog_symlink="${local_manifests_dir}/${program}_program.xml"

  readonly proj_url="https://chrome-internal.googlesource.com/chromeos/project/${program}/${project}"
  readonly proj_src="../../src/project/${program}/${project}"
  readonly proj_symlink="${local_manifests_dir}/${project}_project.xml"

  if ! clone_manifest "${prog_url}" "${prog_src}" "${prog_symlink}"; then
    echo "No program local manifest found in ${prog_url}, continuing."
  fi

  if ! clone_manifest "${proj_url}" "${proj_src}" "${proj_symlink}"; then
    bail "Expected project local manifest in ${proj_url} does not exist, " \
        "exiting."
  fi

  repo sync --force-sync -j48
}

main "$@"