mx.py 文件源码

def parent(self, vcdir, abortOnError=True):
        self.check_for_hg()
        # We don't use run because this can be called very early before _opts is set
        try:
            out = subprocess.check_output(['hg', '-R', vcdir, 'parents', '--template', '{node}\n'])
            parents = out.rstrip('\n').split('\n')
            if len(parents) != 1:
                if abortOnError:
                    abort('hg parents returned {} parents (expected 1)'.format(len(parents)))
                return None
            return parents[0]
        except subprocess.CalledProcessError:
            if abortOnError:
                abort('hg parents failed')
            else:
                return None