depot_tools/roll-dep

#!/usr/bin/env bash
# Copyright (c) 2009 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.

base_dir=$(dirname "$0")

# Ensure that "depot_tools" is somewhere in PATH so this tool can be used
# standalone, but allow other PATH manipulations to take priority.
PATH=$PATH:$base_dir

if [[ $GCLIENT_PY3 = 1 ]]; then
  # Explicitly run on Python 3
  PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/roll_dep.py" "$@"
elif [[ $GCLIENT_PY3 = 0 ]]; then
  # Explicitly run on Python 2
  PYTHONDONTWRITEBYTECODE=1 exec vpython "$base_dir/roll_dep.py" "$@"
else
  # Run on Python 2 for now, allows default to be flipped.
  PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/roll_dep.py" "$@"
fi