fuse_plugin.py 文件源码

def init_root(self):
        # we need the list of all real (non-checkpoint) generations
        client_name = self.obnam.app.settings['client-name']
        generations = [
            gen
            for gen in self.obnam.repo.get_client_generation_ids(client_name)
            if not self.obnam.repo.get_generation_key(
                gen, obnamlib.REPO_GENERATION_IS_CHECKPOINT)]

        # self.rootlist holds the stat information for each entry at
        # the root of the FUSE filesystem: /.pid, /latest, and one for
        # each generation.
        self.rootlist = {}

        used_generations = []
        for gen in generations:
            genspec = self.obnam.repo.make_generation_spec(gen)
            path = '/' + genspec
            try:
                genstat = self.get_stat_in_generation(path)
                end = self.obnam.repo.get_generation_key(
                    gen, obnamlib.REPO_GENERATION_ENDED)
                genstat.st_ctime = genstat.st_mtime = end
                self.rootlist[path] = genstat
                used_generations.append(gen)
            except obnamlib.ObnamError as e:
                logging.warning('Ignoring error %s', str(e))

        assert used_generations

        # self.rootstat is the stat information for the root of the
        # FUSE filesystem. We set it to the same as that of the latest
        # generation.
        latest_gen_id = used_generations[-1]
        latest_gen_spec = self.obnam.repo.make_generation_spec(latest_gen_id)
        latest_gen_root_stat = self.rootlist['/' + latest_gen_spec]
        self.rootstat = fuse.Stat(**latest_gen_root_stat.__dict__)

        # Add an entry for /latest to self.rootlist.
        symlink_stat = fuse.Stat(
            target=latest_gen_spec,
            **latest_gen_root_stat.__dict__)
        symlink_stat.st_mode &= ~(stat.S_IFDIR | stat.S_IFREG)
        symlink_stat.st_mode |= stat.S_IFLNK
        self.rootlist['/latest'] = symlink_stat

        # Add an entry for /.pid to self.rootlist.
        pidstat = fuse.Stat(**self.rootstat.__dict__)
        pidstat.st_mode = (
            stat.S_IFREG | stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH)
        self.rootlist['/.pid'] = pidstat