Create a tool to save a pinned dep file for the current sync.

src/scripts/save_pinned_deps

+#!/bin/bash
+
+# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Save the current state of the tree into a pinned deps file that can later
+# be used to reconstruct the same tree.
+
+# Load common constants.  This should be the first executable line.
+# The path to common.sh should be relative to your script's location.
+. "$(dirname "$0")/common.sh"
+
+# Script must be run outside the chroot, I am not sure why this is but inside
+# the chroot "gclient" is aliased to a warning about using gclient in the
+# chroot.
+assert_outside_chroot
+
+# Flags
+BASE_URL="http://src.chromium.org/git"
+
+DEFINE_string  depfile    ""             "The path to the depfile to create."
+DEFINE_boolean commit     ${FLAGS_FALSE} "Commit the resulting depfile."
+DEFINE_boolean substitute ${FLAGS_FALSE} "Substitute a new base git URL."
+DEFINE_string  base       ${BASE_URL}    "Base git URL to substitute"
+
+# Parse command line
+FLAGS_HELP="usage: $0 [flags]"
+FLAGS "$@" || exit 1
+eval set -- "${FLAGS_ARGV}"
+check_flags_only_and_allow_null_arg "$@" && set --
+
+# Die on any errors.
+set -e
+
+if [ -z "$FLAGS_depfile" ] ; then
+  echo "Error: --depfile is required."
+  exit 1
+fi
+
+DEPPATH="${GCLIENT_ROOT}/deps"
+DEPFILE="${DEPPATH}/${FLAGS_depfile}"
+
+TEMPFILE=$(tempfile)
+DIRNAME=$(dirname "${DEPFILE}")
+FILENAME=$(basename "${DEPFILE}")
+
+cleanup() {
+  # Disable die on error.
+  set +e
+
+  if [ -f "${TEMPFILE}" ]; then
+    rm "${TEMPFILE}"
+  fi
+
+  if [ -f "${DEPFILE}" ]; then
+    rm "${DEPFILE}"
+  fi
+
+  # Turn die on error back on.
+  set -e
+}
+
+reset_repository() {
+  echo "Resetting DEPS repository"
+
+  pushd "${DEPPATH}"
+
+  [ -d ".git" ] || die "${DEPPATH} is not a git repository."
+
+  git reset --hard origin/master
+
+  popd
+}
+
+generate_depfile() {
+  echo "Writing pinned DEPS file to ${DEPFILE}"
+
+  mkdir -p "${DIRNAME}"
+
+  gclient revinfo --snapshot > "${TEMPFILE}"
+
+  ARGS=""
+
+  if [[ $FLAGS_substitute -eq $FLAGS_TRUE ]]; then
+    ARGS="${ARGS} -s -b ${FLAGS_base}"
+  fi
+
+  ARGS="${ARGS} ${TEMPFILE}"
+
+  "${SCRIPTS_DIR}/make_relative_solution" ${ARGS} > ${DEPFILE}
+
+  rm -f "${TEMPFILE}"
+}
+
+commit_depfile() {
+  echo "Commiting pinned DEPS file"
+
+  pushd "${DEPPATH}"
+
+  git add "${FLAGS_depfile}"
+  git commit -m "Automated buildbot update of pinned DEPS file."
+  git reset --hard HEAD
+  git clean -f
+  git remote update
+  git rebase -s ours origin/master
+  git push
+
+  popd
+}
+
+#
+# Generate a pinned deps file from the current gclient sync and check it into
+# the deps.git repository.
+#
+trap "cleanup" EXIT
+
+if [[ $FLAGS_commit -eq $FLAGS_TRUE ]]; then
+  reset_repository
+fi
+
+generate_depfile
+
+if [[ $FLAGS_commit -eq $FLAGS_TRUE ]]; then
+  commit_depfile
+fi
+
+trap - EXIT