30 """Parse a DEPS file and git checkout all of the dependencies.
36   GIT_EXECUTABLE: path to "git" binary; if unset, will look for one of
37   ['git', 'git.exe', 'git.bat'] in your default path.
44 Git Config:
47       git config sync-deps.disable true
51       git config --unset sync-deps.disable
64   """Find the git executable.
70   searchlist = ['git', 'git.exe', 'git.bat']
74     for git in searchlist:
76         subprocess.call([git, '--version'], stdout=devnull)
79       return git
100 def git_repository_sync_is_disabled(git, directory):  argument
103       [git, 'config', 'sync-deps.disable'], cwd=directory)
109 def is_git_toplevel(git, directory):  argument
110   """Return true iff the directory is the top level of a Git repository.
113     git (string) the git executable
120       [git, 'rev-parse', '--show-toplevel'], cwd=directory).strip()
135 def git_checkout_to_directory(git, repo, checkoutable, directory, verbose):  argument
136   """Checkout (and clone if needed) a Git repository.
139     git (string) the git executable
142          for passing to `git clone`.
145                  passing to `git checkout`
152   Raises an exception if any calls to git fail.
156       [git, 'clone', '--quiet', repo, directory])
158   if not is_git_toplevel(git, directory):
159     # if the directory exists, but isn't a git repo, you will modify
161     sys.stdout.write('%s\n  IS NOT TOP-LEVEL GIT DIRECTORY.\n' % directory)
165   if git_repository_sync_is_disabled(git, directory):
172     if 0 == subprocess.call([git, 'checkout', '--quiet', checkoutable],
174       # if this succeeds, skip slow `git fetch`.
182       [git, 'remote', 'set-url', 'origin', repo], cwd=directory)
184   subprocess.check_call([git, 'fetch', '--quiet'], cwd=directory)
186   subprocess.check_call([git, 'checkout', '--quiet', checkoutable], cwd=directory)
213   Raises git Exceptions.
215   git = git_executable()
216   assert git
244       (git, repo, checkoutable, relative_directory, verbose))