#
# Checking out the sources of an official chromium release:
#
# In a working directory, you create three directories:
# - depot_tools: this contains all the tools needed for creating the tarball
# - checkout: here over a GB of source will be checked out
# - output: here the chromium-${RELEASE}.tar.xz source tarball will be created.

# Note: if you want to find out the recommended version for the native_client
# toolchains, search for the line:
#   'src/native_client':
# in
#   http://src.chromium.org/viewvc/chrome/releases/$VERSION}/DEPS
# and take the value which is after the '@'on the next line, e.g.:
#   '/trunk/src/native_client@12558',

# Some variables:

CHROMIUM_REL=${CHROMIUM_REL:-"43.0.2357.124"}
WORKING_DIR=${WORKING_DIR:-"${HOME}/chromium_src"}

DEPOT_TOOLS_REPO="https://chromium.googlesource.com/chromium/tools/depot_tools.git"

# The actual work (takes a while to checkout 1 GB of source and pack it up:

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

# Clone the tools:
git clone ${DEPOT_TOOLS_REPO}

# Check out the sources:
mkdir -p checkout
cd checkout
PATH="../depot_tools/:$PATH" fetch --nohooks chromium --target_os=linux
PATH="../depot_tools/:$PATH" gclient sync --force --nohooks --with_branch_heads

# Expose the release tag we want:
cd src
  git fetch origin --tags
  git reset --hard $CHROMIUM_REL
  PATH="../../depot_tools/:$PATH" gclient sync --force --nohooks --with_branch_heads
cd -

# -- OLD ------------------------------------------------------------------
#RELEASES_URL="https://src.chromium.org/chrome/releases"
#PATH="../depot_tools/:$PATH" gclient config ${RELEASES_URL}/${CHROMIUM_REL}
## At this moment, your config will have been written to a file '.gclient'
#PATH="../depot_tools/:$PATH" gclient sync 2>&1 | tee ../sync.log
## The sync will download everything, based on what it found in this file:
## ${CHROMIUM_REL}/DEPS 
#PATH="../depot_tools/:$PATH" gclient sync 2>&1 | tee ../sync.2.log
# -- OLD ------------------------------------------------------------------

# Pack up the source tarball:
mkdir ../output
python src/tools/export_tarball/export_tarball.py --remove-nonessential-files ../output/chromium-${CHROMIUM_REL}

echo ""
echo "Resulting source tarball is: ${WORKING_DIR}/output/chromium-${CHROMIUM_REL}.tar.xz"
echo ""