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125 lines
4.1 KiB
Python
125 lines
4.1 KiB
Python
#!/usr/bin/env python
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# Copyright 2013 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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#
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# Usage:
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# gclient-new-workdir.py [options] <repository> <new_workdir>
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#
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from __future__ import print_function
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import argparse
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import os
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import shutil
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import subprocess
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import sys
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import textwrap
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import git_common
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def parse_options():
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if sys.platform == 'win32':
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print('ERROR: This script cannot run on Windows because it uses symlinks.')
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sys.exit(1)
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parser = argparse.ArgumentParser(description='''\
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Clone an existing gclient directory, taking care of all sub-repositories.
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Works similarly to 'git new-workdir'.''')
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parser.add_argument('repository', type=os.path.abspath,
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help='should contain a .gclient file')
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parser.add_argument('new_workdir', help='must not exist')
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parser.add_argument('--reflink', action='store_true', default=None,
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help='''force to use "cp --reflink" for speed and disk
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space. need supported FS like btrfs or ZFS.''')
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parser.add_argument('--no-reflink', action='store_false', dest='reflink',
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help='''force not to use "cp --reflink" even on supported
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FS like btrfs or ZFS.''')
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args = parser.parse_args()
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if not os.path.exists(args.repository):
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parser.error('Repository "%s" does not exist.' % args.repository)
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gclient = os.path.join(args.repository, '.gclient')
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if not os.path.exists(gclient):
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parser.error('No .gclient file at "%s".' % gclient)
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if os.path.exists(args.new_workdir):
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parser.error('New workdir "%s" already exists.' % args.new_workdir)
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return args
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def support_cow(src, dest):
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# 'cp --reflink' always succeeds when 'src' is a symlink or a directory
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assert os.path.isfile(src) and not os.path.islink(src)
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try:
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subprocess.check_output(['cp', '-a', '--reflink', src, dest],
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stderr=subprocess.STDOUT)
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except subprocess.CalledProcessError:
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return False
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finally:
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if os.path.isfile(dest):
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os.remove(dest)
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return True
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def try_vol_snapshot(src, dest):
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try:
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subprocess.check_call(['btrfs', 'subvol', 'snapshot', src, dest],
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stderr=subprocess.STDOUT)
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except (subprocess.CalledProcessError, OSError):
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return False
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return True
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def main():
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args = parse_options()
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gclient = os.path.join(args.repository, '.gclient')
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if os.path.islink(gclient):
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gclient = os.path.realpath(gclient)
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new_gclient = os.path.join(args.new_workdir, '.gclient')
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if try_vol_snapshot(args.repository, args.new_workdir):
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args.reflink = True
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else:
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os.makedirs(args.new_workdir)
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if args.reflink is None:
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args.reflink = support_cow(gclient, new_gclient)
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if args.reflink:
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print('Copy-on-write support is detected.')
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os.symlink(gclient, new_gclient)
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for root, dirs, _ in os.walk(args.repository):
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if '.git' in dirs:
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workdir = root.replace(args.repository, args.new_workdir, 1)
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print('Creating: %s' % workdir)
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if args.reflink:
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if not os.path.exists(workdir):
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print('Copying: %s' % workdir)
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subprocess.check_call(['cp', '-a', '--reflink', root, workdir])
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shutil.rmtree(os.path.join(workdir, '.git'))
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git_common.make_workdir(os.path.join(root, '.git'),
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os.path.join(workdir, '.git'))
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if args.reflink:
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subprocess.check_call(['cp', '-a', '--reflink',
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os.path.join(root, '.git', 'index'),
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os.path.join(workdir, '.git', 'index')])
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else:
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subprocess.check_call(['git', 'checkout', '-f'], cwd=workdir)
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if args.reflink:
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print(textwrap.dedent('''\
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The repo was copied with copy-on-write, and the artifacts were retained.
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More details on http://crbug.com/721585.
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Depending on your usage pattern, you might want to do "gn gen"
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on the output directories. More details: http://crbug.com/723856.'''))
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if __name__ == '__main__':
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sys.exit(main())
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