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2525c1ed46
Summary: This is going to be useful for a small regenerate script I want to write and open source. Reviewed By: yfeldblum Differential Revision: D5831942 fbshipit-source-id: c1610ba1aa93061662e8cca3052f842b74fa4838
58 lines
1.6 KiB
Python
58 lines
1.6 KiB
Python
#!/usr/bin/env python3
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# Copyright (c) 2017-present, Facebook, Inc.
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# All Rights Reserved.
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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'''Utilities for dealing with tar files.'''
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import os
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import tarfile
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from typing import List
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def from_dirs(dirs: List[str], tar_filename: str):
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'''Create a .tar.gz file from a given list of directories.'''
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with tarfile.open(tar_filename, 'w:gz') as tar:
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for dir in dirs:
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tar.add(dir, arcname=os.path.basename(dir))
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def extractall_safe(path: str, dest: str) -> str:
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'''Extract a tar safely. Raise an exception if there are any bad paths.
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Returns the subdirectory the files were extracted to.'''
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tar = tarfile.open(path)
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firstdir = _check_members(path, tar)
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tar.extractall(dest)
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return os.path.join(dest, firstdir)
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def _check_members(path: str, tar: tarfile.TarFile) -> str:
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firstdir = None
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for finfo in tar:
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if _badpath(finfo.name):
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raise RuntimeError('{} has bad path: {}'.format(path, finfo.name))
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if firstdir is None:
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firstdir = _firstdir(finfo.name)
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elif firstdir != _firstdir(finfo.name):
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raise RuntimeError(
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'{}: expected path {} to begin with {}'.
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format(path, finfo.name, firstdir)
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)
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if firstdir is None:
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raise RuntimeError('{}: empty tar file'.format(path))
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return firstdir
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def _badpath(path: str) -> bool:
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return path.startswith('..') or path.startswith('/')
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def _firstdir(rel_path: str) -> str:
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return rel_path.split('/', 1)[0]
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