31 lines
1.1 KiB
Python
31 lines
1.1 KiB
Python
import os
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AUFS_METADATA = u'.wh..wh.'
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AUFS_WHITEOUT = u'.wh.'
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AUFS_WHITEOUT_PREFIX_LENGTH = len(AUFS_WHITEOUT)
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def is_aufs_metadata(absolute):
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""" Returns whether the given absolute references an AUFS metadata file. """
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filename = os.path.basename(absolute)
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return filename.startswith(AUFS_METADATA) or absolute.startswith(AUFS_METADATA)
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def get_deleted_filename(absolute):
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""" Returns the name of the deleted file referenced by the AUFS whiteout file at
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the given path or None if the file path does not reference a whiteout file.
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"""
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filename = os.path.basename(absolute)
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if not filename.startswith(AUFS_WHITEOUT):
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return None
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return filename[AUFS_WHITEOUT_PREFIX_LENGTH:]
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def get_deleted_prefix(absolute):
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""" Returns the path prefix of the deleted file referenced by the AUFS whiteout file at
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the given path or None if the file path does not reference a whiteout file.
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"""
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deleted_filename = get_deleted_filename(absolute)
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if deleted_filename is None:
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return None
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dirname = os.path.dirname(absolute)
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return os.path.join('/', dirname, deleted_filename)[1:]
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