#!/bin/bash
# Copyright 2018 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file

# Prints to stdout a script that creates a new third_party fuchsia mirror of a
# github project. Sets appropriate ACLs, copy config, and Gerrit access.
#
# Usage:
#   $ new-github-repo <github-project-name> > generated-script
#   $ bash generated-script
#
# TODO(dbort): Don't create non-upstream versions of branches, only master.
# E.g., it's fine to have 'origin/upstream/release-b', but we don't need
# 'origin/release-b' as well. We only want 'origin/master'.

set -o errexit
set -o nounset
set -o pipefail

if [[ "$#" -ne 1 ]]; then
  echo "Usage: $0 <github-project-name>" >&2
  echo " github-project-name is relative to, "$(
       )"and does not include, 'github.com'" >&2
  exit 1
fi
readonly GITHUB_PROJECT="$1"
readonly UPSTREAM_GOB="github/${GITHUB_PROJECT}"
readonly REPO_BASENAME="$(basename "${UPSTREAM_GOB}")"
readonly MIRROR_GOB="fuchsia/third_party/${REPO_BASENAME}"

# Prints a gob-ctl command to stdout. If args are supplied, prints them. If
# not, reads from stdin and emits HERE-style lines to write that same data to
# gob-ctl.
run-gob-ctl() {
  if [[ "$#" -gt 0 ]]; then
    echo "gob-ctl $@"
  else
    echo "gob-ctl <<EOF"
    cat
    echo "EOF"
  fi
}

echo "#!/bin/bash"
echo "set -eu"
echo "set -o pipefail"

run-gob-ctl create -fork "${UPSTREAM_GOB}" "${MIRROR_GOB}"
echo 'echo "Waiting 5 seconds for the creation to finish..."'
# Without this sleep, the acl commands sometimes fail.
echo 'sleep 5'

run-gob-ctl acl "${MIRROR_GOB}" --reader 'all_users'
run-gob-ctl acl "${MIRROR_GOB}" --owner 'mdbgroup/fuchsia-team'
run-gob-ctl acl "${MIRROR_GOB}" --revoke "mdbuser/${USER}"
run-gob-ctl acl "${MIRROR_GOB}" --revoke "email/${USER}@google.com"

run-gob-ctl <<EOF
copy {
  source: "${UPSTREAM_GOB}"
  destination: "${MIRROR_GOB}"
  create: <
    source_scope: <
      all: USERS
    >
    destination_scope: <
      mdb_group: "fuchsia-git-admins"
    >
    add_refspec: <
      source: "refs/heads/*"
      destination: "refs/heads/upstream/*"
    >
    add_refspec: <
      source: "refs/tags/*"
      destination: "refs/tags/*"
    >
  >
}
EOF

run-gob-ctl show "${MIRROR_GOB}"

# fix_parent <MIRROR_GOB>
fix_parent() {
  local gob_name="$1"
  # The part before the first slash
  local host_name="$(echo "${gob_name}" | sed -e 's,/.*,,')"
  # The part after the first slash, with slashes URL-encoded
  local project_id="$(echo "${gob_name}" | sed -e 's,[^/]*/,,;s,/,%2F,g')"

  local host_url="https://${host_name}-review.googlesource.com/a"
  local new_parent='Third-Party-Projects'

  cat <<HERE
gob-curl \
  -d '{"parent": "${new_parent}", "commit_message": "Set parent to ${new_parent}"}' \
  -H "Content-Type: application/json" \
  -X PUT \
  "${host_url}/projects/${project_id}/parent"
HERE
}

echo 'read -p "Press enter to set the parent project..."'
fix_parent "${MIRROR_GOB}"
echo 'echo Done.'