#!/bin/bash
# Copyright 2026 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.

#### CATEGORY=Source tree
### Bootstrap and synchronize local dependencies for a Fuchsia git checkout

## usage: fx sync
##
## If run in a plain OSS fuchsia.git clone without an existing Jiri checkout,
## initializes an untracked stub integration directory and synchronizes Jiri
## projects and prebuilt packages to match the current HEAD.
##
## A standard Jiri checkout is detected when .jiri_root or integration already
## exists without a .fxsync directory; in that case, fx sync exits without
## modifying the checkout.

# shellcheck disable=SC1090
source "$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"/lib/vars.sh || exit $?
fx-standard-switches "$@"
set -- "${FX_ARGV[@]}"
set -o pipefail

if [[ $# -gt 0 ]]; then
  fx-error "Unknown argument: $1"
  fx-command-help
  exit 1
fi

declare -r fxsync_dir="${FUCHSIA_DIR}/.fxsync"

# Distinguish between three checkout states:
# 1. Standard Jiri checkout: .jiri_root or integration exists, but .fxsync does
#    not. Bail out so we never touch a normal Jiri workspace.
# 2. Existing fx sync checkout: .fxsync exists (alongside the .jiri_root and
#    integration directories created by an earlier fx sync run). Proceed.
# 3. Fresh git clone: none of .fxsync, .jiri_root, or integration exist yet.
#    Proceed with initial bootstrap.
if [[ ! -d "${fxsync_dir}" && ( -e "${FUCHSIA_DIR}/.jiri_root" || -e "${FUCHSIA_DIR}/integration" ) ]]; then
  exit 0
fi

if [[ ! -e "${FUCHSIA_DIR}/.git" || ! -f "${FUCHSIA_DIR}/manifests/platform" ]]; then
  fx-error "Cannot sync: ${FUCHSIA_DIR} is not a fuchsia.git checkout."
  exit 1
fi

# Ensure commands run from the root of the Fuchsia checkout (in case fx was
# invoked from a subdirectory/subproject or from the fx self-test harness).
cd "${FUCHSIA_DIR}" || exit $?

# Detect whether the repo state is clean: the manifest_state_file should have
# the current values of all pinned repos.
declare -r manifest_state_file="${fxsync_dir}/manifest_state"
manifest_state="$(
  git rev-parse \
    HEAD:manifests \
    HEAD:third_party/cobalt \
    HEAD:third_party/cobalt_config
)" || exit $?
if [[ -f "${manifest_state_file}" && "$(<"${manifest_state_file}")" == "${manifest_state}" ]]; then
  exit 0
fi

# Create the .fxsync marker directory and a minimal stub integration/ directory
# for Jiri hooks and GN/Bazel build files that read //integration/MILESTONE and
# //integration/ctf/all. Use "0" as a placeholder milestone for local
# non-release checkouts.
mkdir -p \
  "${fxsync_dir}" \
  "${FUCHSIA_DIR}/integration/ctf"
touch "${FUCHSIA_DIR}/integration/ctf/all"
echo "0" > "${FUCHSIA_DIR}/integration/MILESTONE"

# Bootstrap the Jiri binary into .jiri_root/bin/jiri if not already present,
# and initialize the Jiri root in FUCHSIA_DIR.
declare -r jiri_bin="${FUCHSIA_DIR}/.jiri_root/bin/jiri"
if [[ ! -x "${jiri_bin}" ]]; then
  curl -sf "https://fuchsia.googlesource.com/jiri/+/HEAD/scripts/bootstrap_jiri?format=TEXT" \
    | base64 --decode \
    | bash -s "${FUCHSIA_DIR}" || exit $?
fi
"${jiri_bin}" init \
  -analytics-opt=false \
  -rewrite-sso-to-https=true \
  -keep-git-hooks=true \
  "${FUCHSIA_DIR}" || exit $?

head_rev="$(git rev-parse HEAD)" || exit $?
cobalt_rev="$(git rev-parse HEAD:third_party/cobalt)" || exit $?
cobalt_config_rev="$(git rev-parse HEAD:third_party/cobalt_config)" || exit $?

# Write Jiri's per-repository project metadata (.git/jiri/metadata.v2) so Jiri
# recognizes the existing root git clone as the "fuchsia" project declared in
# manifests/platform instead of attempting to clone it into FUCHSIA_DIR, and
# write .git/JIRI_HEAD (which `jiri update` skips when `no-update` is true) for
# hooks and tools that reference JIRI_HEAD.
mkdir -p "${FUCHSIA_DIR}/.git/jiri"
cat > "${FUCHSIA_DIR}/.git/jiri/metadata.v2" <<EOF
<project name="fuchsia" path="." remote="https://fuchsia.googlesource.com/fuchsia" revision="${head_rev}"/>
EOF
echo "${head_rev}" > "${FUCHSIA_DIR}/.git/JIRI_HEAD"

# Configure Jiri not to fetch or reset the root "fuchsia" git repository during
# `jiri update`, since the developer manages the root repository directly with
# git (e.g. local branches or `git checkout`).
"${jiri_bin}" project-config -no-update=true || exit $?

# Generate the top-level .jiri_manifest importing manifests/platform and
# pinning third_party/cobalt and third_party/cobalt_config to the revisions
# recorded in the current fuchsia.git commit's gitlinks.
cat > "${FUCHSIA_DIR}/.jiri_manifest" <<EOF
<manifest>
  <imports>
    <localimport file="manifests/platform"/>
  </imports>
  <projects>
    <project name="cobalt"
             path="third_party/cobalt"
             remote="https://fuchsia.googlesource.com/cobalt"
             revision="${cobalt_rev}"
             gerrithost="https://fuchsia-review.googlesource.com"/>
    <project name="cobalt-registry"
             path="third_party/cobalt_config"
             remote="https://fuchsia.googlesource.com/cobalt-registry"
             revision="${cobalt_config_rev}"
             gerrithost="https://fuchsia-review.googlesource.com"/>
  </projects>
</manifest>
EOF

"${jiri_bin}" update || exit $?
echo "${manifest_state}" > "${manifest_state_file}"