#!/bin/bash

# Checking out the sources of an official chromium release,
# by Eric Hameleers <alien at slackware.com>:
# In a working directory, the script creates three directories:
# - depot_tools: this contains all the tools needed for creating the tarball
# - src: here 30 GB of sourcecode will be checked out
# - output: here the chromium-${VERSION}.tar.xz source tarball will be created.

# --------------------------------------------------------------------------
# Another example:
# https://gitlab.archlinux.org/archlinux/packaging/packages/chromium/-/blob/main/fetch-chromium-release?ref_type=heads
# --------------------------------------------------------------------------

set -e

VERSION="$1"

if [[ -z $VERSION ]]; then
  # Query the API for the most recent Linux release:
  VERSION=$(curl -s "https://versionhistory.googleapis.com/v1/chrome/platforms/linux/channels/stable/versions" | jq -r '.versions[0].version')
  echo "-- [$(date +%Y%m%d_%H%M)] will use latest Chromium release $VERSION"
fi

# Some variables:

TMP=${TMP:-"/tmp"}
WORKING_DIR="$TMP/chromium_src"

DEPOT_TOOLS_REPO="https://chromium.googlesource.com/chromium/tools/depot_tools.git"
CHROMIUM_REPO="https://chromium.googlesource.com/chromium/src"
RELEASES_URL="https://src.chromium.org/chrome/releases"

EXPORT_TARBALL_PY="https://chromium.googlesource.com/chromium/tools/build/+/refs/heads/main/recipes/recipe_modules/chromium/resources/export_tarball.py"

# The actual work (takes a while to checkout 30 GB of data and pack it up:

rm -rf ${WORKING_DIR}
mkdir -p ${WORKING_DIR}
cd ${WORKING_DIR}

echo "-- [$(date +%Y%m%d_%H%M)] starting the work"
# Clone the tools:
git clone --depth=1 ${DEPOT_TOOLS_REPO}
export PATH="$PWD/depot_tools:$PATH" DEPOT_TOOLS_UPDATE=0

# Get the export_tarball.py script:
curl -s "${EXPORT_TARBALL_PY}/?format=TEXT" |base64 -d > export_tarball.py
python3 -m py_compile export_tarball.py || { echo "Bad export_tarball.py download"; exit 1; }

# Use gclient to fetch the source and all the other required stuff:
gclient config --name src ${CHROMIUM_REPO}.git@${VERSION}
cat <<EOF >> .gclient
target_os = [ 'linux' ]
target_cpu = [ 'x64' ]
EOF

# Run the Chromium-specific hooks, which will download additional binaries
# and other stuff we need:
gclient sync --no-history --nohooks
gclient runhooks

# Chromium last change fetching utility:
python3 src/build/util/lastchange.py -o src/build/util/LASTCHANGE
python3 src/build/util/lastchange.py -m GPU_LISTS_VERSION \
  --revision-id-only --header src/gpu/config/gpu_lists_version.h
python3 src/build/util/lastchange.py -m SKIA_COMMIT_HASH \
  -s src/third_party/skia --header src/skia/ext/skia_commit_hash.h
python3 src/build/util/lastchange.py \
  -s src/third_party/dawn --revision src/gpu/webgpu/DAWN_VERSION

# Don't ask me why:
touch src/chrome/test/data/webui/i18n_process_css_test.html

# PGO profiles:
python3 src/tools/update_pgo_profiles.py --target=linux update \
  --gs-url-base=chromium-optimization-profiles/pgo_profiles
python3 src/v8/tools/builtins-pgo/download_profiles.py \
  --force --check-v8-revision --depot-tools depot_tools download

# Force CIPD to fetch platform-specific packages:
python3 src/third_party/devtools-frontend/src/scripts/deps/sync_rollup_libs.py

# Also needed:
src/third_party/node/update_npm_deps
find src/third_party/jdk/current -type f -delete

# Create the tarball:
echo "-- [$(date +%Y%m%d_%H%M)] PATIENCE! Creating tarball for chromium-$VERSION"
mkdir output
python3 export_tarball.py --version --xz \
  --remove-nonessential-files \
  output/chromium-${VERSION} --progress --src-dir src/

# That's it, folks!
echo "-- [$(date +%Y%m%d_%H%M)] Tarball for chromium-$VERSION created in $(pwd)/output/"