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267 lines
7.9 KiB
267 lines
7.9 KiB
#!/usr/bin/env python
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# Copyright 2014 Google Inc.
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#
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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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"""Parse a DEPS file and git checkout all of the dependencies.
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Args:
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An optional list of deps_os values.
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Environment Variables:
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GIT_EXECUTABLE: path to "git" binary; if unset, will look for git in
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your default path.
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GIT_SYNC_DEPS_PATH: file to get the dependency list from; if unset,
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will use the file ../DEPS relative to this script's directory.
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GIT_SYNC_DEPS_QUIET: if set to non-empty string, suppress messages.
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Git Config:
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To disable syncing of a single repository:
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cd path/to/repository
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git config sync-deps.disable true
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To re-enable sync:
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cd path/to/repository
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git config --unset sync-deps.disable
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"""
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import os
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import subprocess
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import sys
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import threading
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def git_executable():
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"""Find the git executable.
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Returns:
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A string suitable for passing to subprocess functions, or None.
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"""
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envgit = os.environ.get('GIT_EXECUTABLE')
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searchlist = ['git']
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if envgit:
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searchlist.insert(0, envgit)
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with open(os.devnull, 'w') as devnull:
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for git in searchlist:
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try:
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subprocess.call([git, '--version'], stdout=devnull)
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except (OSError,):
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continue
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return git
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return None
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DEFAULT_DEPS_PATH = os.path.normpath(
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os.path.join(os.path.dirname(__file__), os.pardir, 'DEPS'))
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def usage(deps_file_path = None):
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sys.stderr.write(
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'Usage: run to grab dependencies, with optional platform support:\n')
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sys.stderr.write(' %s %s' % (sys.executable, __file__))
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if deps_file_path:
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parsed_deps = parse_file_to_dict(deps_file_path)
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if 'deps_os' in parsed_deps:
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for deps_os in parsed_deps['deps_os']:
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sys.stderr.write(' [%s]' % deps_os)
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sys.stderr.write('\n\n')
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sys.stderr.write(__doc__)
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def git_repository_sync_is_disabled(git, directory):
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try:
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disable = subprocess.check_output(
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[git, 'config', 'sync-deps.disable'], cwd=directory)
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return disable.lower().strip() in ['true', '1', 'yes', 'on']
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except subprocess.CalledProcessError:
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return False
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def is_git_toplevel(git, directory):
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"""Return true iff the directory is the top level of a Git repository.
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Args:
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git (string) the git executable
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directory (string) the path into which the repository
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is expected to be checked out.
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"""
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try:
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toplevel = subprocess.check_output(
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[git, 'rev-parse', '--show-toplevel'], cwd=directory).strip()
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return os.path.realpath(directory) == os.path.realpath(toplevel.decode())
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except subprocess.CalledProcessError:
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return False
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def status(directory, commithash, change):
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def truncate(s, length):
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return s if len(s) <= length else s[:(length - 3)] + '...'
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dlen = 36
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directory = truncate(directory, dlen)
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commithash = truncate(commithash, 40)
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symbol = '>' if change else '@'
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sys.stdout.write('%-*s %s %s\n' % (dlen, directory, symbol, commithash))
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def git_checkout_to_directory(git, repo, commithash, directory, verbose):
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"""Checkout (and clone if needed) a Git repository.
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Args:
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git (string) the git executable
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repo (string) the location of the repository, suitable
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for passing to `git clone`.
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commithash (string) a commit, suitable for passing to `git checkout`
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directory (string) the path into which the repository
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should be checked out.
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verbose (boolean)
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Raises an exception if any calls to git fail.
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"""
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if not os.path.isdir(directory):
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subprocess.check_call(
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[git, 'clone', '--quiet', '--no-checkout', repo, directory])
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subprocess.check_call([git, 'checkout', '--quiet', commithash],
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cwd=directory)
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if verbose:
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status(directory, commithash, True)
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return
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if not is_git_toplevel(git, directory):
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# if the directory exists, but isn't a git repo, you will modify
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# the parent repostory, which isn't what you want.
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sys.stdout.write('%s\n IS NOT TOP-LEVEL GIT DIRECTORY.\n' % directory)
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return
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# Check to see if this repo is disabled. Quick return.
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if git_repository_sync_is_disabled(git, directory):
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sys.stdout.write('%s\n SYNC IS DISABLED.\n' % directory)
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return
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with open(os.devnull, 'w') as devnull:
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# If this fails, we will fetch before trying again. Don't spam user
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# with error infomation.
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if 0 == subprocess.call([git, 'checkout', '--quiet', commithash],
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cwd=directory, stderr=devnull):
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# if this succeeds, skip slow `git fetch`.
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if verbose:
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status(directory, commithash, False) # Success.
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return
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# If the repo has changed, always force use of the correct repo.
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# If origin already points to repo, this is a quick no-op.
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subprocess.check_call(
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[git, 'remote', 'set-url', 'origin', repo], cwd=directory)
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subprocess.check_call([git, 'fetch', '--quiet'], cwd=directory)
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subprocess.check_call([git, 'checkout', '--quiet', commithash], cwd=directory)
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if verbose:
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status(directory, commithash, True) # Success.
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def parse_file_to_dict(path):
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dictionary = {}
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with open(path) as f:
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exec('def Var(x): return vars[x]\n' + f.read(), dictionary)
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return dictionary
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def is_sha1_sum(s):
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"""SHA1 sums are 160 bits, encoded as lowercase hexadecimal."""
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return len(s) == 40 and all(c in '0123456789abcdef' for c in s)
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def git_sync_deps(deps_file_path, command_line_os_requests, verbose):
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"""Grab dependencies, with optional platform support.
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Args:
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deps_file_path (string) Path to the DEPS file.
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command_line_os_requests (list of strings) Can be empty list.
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List of strings that should each be a key in the deps_os
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dictionary in the DEPS file.
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Raises git Exceptions.
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"""
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git = git_executable()
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assert git
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deps_file_directory = os.path.dirname(deps_file_path)
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deps_file = parse_file_to_dict(deps_file_path)
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dependencies = deps_file['deps'].copy()
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os_specific_dependencies = deps_file.get('deps_os', dict())
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if 'all' in command_line_os_requests:
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for value in os_specific_dependencies.itervalues():
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dependencies.update(value)
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else:
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for os_name in command_line_os_requests:
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# Add OS-specific dependencies
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if os_name in os_specific_dependencies:
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dependencies.update(os_specific_dependencies[os_name])
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for directory in dependencies:
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for other_dir in dependencies:
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if directory.startswith(other_dir + '/'):
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raise Exception('%r is parent of %r' % (other_dir, directory))
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list_of_arg_lists = []
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for directory in sorted(dependencies):
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if not isinstance(dependencies[directory], str):
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if verbose:
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sys.stdout.write( 'Skipping "%s".\n' % directory)
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continue
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if '@' in dependencies[directory]:
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repo, commithash = dependencies[directory].split('@', 1)
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else:
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raise Exception("please specify commit")
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if not is_sha1_sum(commithash):
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raise Exception("poorly formed commit hash: %r" % commithash)
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relative_directory = os.path.join(deps_file_directory, directory)
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list_of_arg_lists.append(
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(git, repo, commithash, relative_directory, verbose))
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multithread(git_checkout_to_directory, list_of_arg_lists)
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def multithread(function, list_of_arg_lists):
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# for args in list_of_arg_lists:
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# function(*args)
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# return
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threads = []
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for args in list_of_arg_lists:
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thread = threading.Thread(None, function, None, args)
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thread.start()
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threads.append(thread)
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for thread in threads:
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thread.join()
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def main(argv):
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deps_file_path = os.environ.get('GIT_SYNC_DEPS_PATH', DEFAULT_DEPS_PATH)
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verbose = not bool(os.environ.get('GIT_SYNC_DEPS_QUIET', False))
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if '--help' in argv or '-h' in argv:
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usage(deps_file_path)
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return 1
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git_sync_deps(deps_file_path, argv, verbose)
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subprocess.check_call(
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[sys.executable,
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os.path.join(os.path.dirname(deps_file_path), 'bin', 'fetch-gn')])
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return 0
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if __name__ == '__main__':
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exit(main(sys.argv[1:]))
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