git.py 文件源码

def update(self, dest, rev_options):
        # First fetch changes from the default remote
        if self.get_git_version() >= parse_version('1.9.0'):
            # fetch tags in addition to everything else
            self.run_command(['fetch', '-q', '--tags'], cwd=dest)
        else:
            self.run_command(['fetch', '-q'], cwd=dest)
        # Then reset to wanted revision (maybe even origin/master)
        if rev_options:
            rev_options = self.check_rev_options(
                rev_options[0], dest, rev_options,
            )
        self.run_command(['reset', '--hard', '-q'] + rev_options, cwd=dest)
        #: update submodules
        self.update_submodules(dest)