#!/bin/bash
# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# A convenience script to largely replicate the behavior of `gclient sync` in a
# submodule-based checkout.  Fetches latest commits for top-level solutions;
# updates submodules; and runs post-sync hooks.

j=10
ECHO=
pull=pull
pull_args=
hooks=yes

if ( echo test | xargs --max-lines=1 true 2>/dev/null ); then
  max_lines="--max-lines=1"
else
  max_lines="-L 1"
fi

usage() {
  cat <<EOF 1>&2
Usage: git-crup [-n|--dry-run] [--fetch] [-j|--jobs [jobs]]
    [--no-hooks] [<args to git-pull or git-fetch>]
EOF
}

parallel_update() {
  ( echo Entering "$1"
    cd "$1"
    $ECHO git $pull $pull_args origin
    $ECHO git submodule sync
    if test "$xargs_parallel" = "yes"; then
      git ls-files -s | grep ^160000 | awk '{print $4}' |
      xargs $max_lines -P "$j" $ECHO git submodule update --init
    else
      $ECHO git submodule update --init
    fi )
}

while test $# -ne 0; do
  case "$1" in
    -j[0-9]*)
      j=$(echo "$1" | cut -c3-)
      ;;
    --jobs=[0-9]*)
      j=$(echo "$1" | cut -c8-)
      ;;
    -j|--jobs)
      case "$2" in
        ''|-*)
          j=0
          ;;
        *)
          j="$2"
          shift
          ;;
      esac
      ;;
    -n|--dry-run)
      ECHO=echo
      ;;
    -h|--help)
      usage
      exit 0
      ;;
    --fetch)
      pull=fetch
      ;;
    --no-hooks)
      hooks=no
      ;;
    *)
      pull_args="$pull_args $1"
      break
      ;;
  esac
  shift
done

while test "$PWD" != "/"; do
  if test -f "$PWD/src/.gitmodules"; then
    break
  fi
  cd ..
done
if test "$PWD" = "/"; then
  echo "Could not find the root of your checkout; aborting." 1>&2
  exit 1
fi

if ( echo test test | xargs -P 2 true 2>/dev/null ); then
  xargs_parallel=yes
else
  if test "$j" != "1"; then
    echo "Warning: parallel execution is not supported on this platform." 1>&2
  fi
  xargs_parallel=no
fi

ls -d */.git |
while read gitdir; do
  parallel_update `dirname $gitdir`
done

gclient_spec="solutions=[{'name':'src','url':None,'deps_file':'.DEPS.git'}]"
test "$hooks" = "yes" && gclient runhooks --spec="$gclient_spec"