| #!/usr/bin/env python |
| # Copyright 2013 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. |
| |
| """This script is a wrapper around the GN binary that is pulled from Google |
| Cloud Storage when you sync Chrome. The binaries go into platform-specific |
| subdirectories in the source tree. |
| |
| This script makes there be one place for forwarding to the correct platform's |
| binary. It will also automatically try to find the gn binary when run inside |
| the chrome source tree, so users can just type "gn" on the command line |
| (normally depot_tools is on the path).""" |
| |
| import os |
| import subprocess |
| import sys |
| |
| |
| class PlatformUnknownError(IOError): |
| pass |
| |
| |
| def HasDotfile(path): |
| """Returns True if the given path has a .gn file in it.""" |
| return os.path.exists(path + '/.gn') |
| |
| |
| def FindSourceRootOnPath(): |
| """Searches upward from the current directory for the root of the source |
| tree and returns the found path. Returns None if no source root could |
| be found.""" |
| cur = os.getcwd() |
| while True: |
| if HasDotfile(cur): |
| return cur |
| up_one = os.path.dirname(cur) |
| if up_one == cur: |
| return None # Reached the top of the directory tree |
| cur = up_one |
| |
| |
| def RunGN(sourceroot): |
| # The binaries in platform-specific subdirectories in src/tools/gn/bin. |
| gnpath = sourceroot + '/tools/gn/bin/' |
| if sys.platform in ('cygwin', 'win32'): |
| gnpath += 'win/gn.exe' |
| elif sys.platform.startswith('linux'): |
| gnpath += 'linux/gn' |
| elif sys.platform == 'darwin': |
| gnpath += 'mac/gn' |
| else: |
| raise PlatformUnknownError('Unknown platform for GN: ' + sys.platform) |
| |
| return subprocess.call([gnpath] + sys.argv[1:]) |
| |
| |
| def main(args): |
| sourceroot = FindSourceRootOnPath() |
| if not sourceroot: |
| print >> sys.stderr, '.gn file not found in any parent of the current path.' |
| sys.exit(1) |
| return RunGN(sourceroot) |
| |
| if __name__ == '__main__': |
| sys.exit(main(sys.argv)) |