77 lines
2 KiB
Python
77 lines
2 KiB
Python
import marisa_trie
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import os
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import util.vendor.paxtarfile as tarfile
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from util.registry.aufs import is_aufs_metadata, get_deleted_prefix
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ALLOWED_TYPES = {tarfile.REGTYPE, tarfile.AREGTYPE}
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def files_and_dirs_from_tar(source_stream, removed_prefix_collector):
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try:
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tar_stream = tarfile.open(mode='r|*', fileobj=source_stream)
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except tarfile.ReadError:
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# Empty tar file
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return
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for tar_info in tar_stream:
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absolute = os.path.relpath(tar_info.name.decode('utf-8'), './')
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# Skip metadata.
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if is_aufs_metadata(absolute):
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continue
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# Add prefixes of removed paths to the collector.
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deleted_prefix = get_deleted_prefix(absolute)
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if deleted_prefix is not None:
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removed_prefix_collector.add(deleted_prefix)
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continue
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# Otherwise, yield the path if it is in the allowed types.
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if tar_info.type in ALLOWED_TYPES:
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yield '/' + absolute
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def __compute_removed(base_trie, removed_prefixes):
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for prefix in removed_prefixes:
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for filename in base_trie.keys(prefix):
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yield filename
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def __compute_added_changed(base_trie, delta_trie):
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added = set()
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changed = set()
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for filename in delta_trie.keys():
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if filename not in base_trie:
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added.add(filename)
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else:
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changed.add(filename)
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return added, changed
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def __new_fs(base_trie, added, removed):
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for filename in base_trie.keys():
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if filename not in removed:
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yield filename
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for filename in added:
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yield filename
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def empty_fs():
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return marisa_trie.Trie()
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def compute_new_diffs_and_fs(base_trie, filename_source,
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removed_prefix_collector):
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new_trie = marisa_trie.Trie(filename_source)
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(new_added, new_changed) = __compute_added_changed(base_trie, new_trie)
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new_removed = marisa_trie.Trie(__compute_removed(base_trie,
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removed_prefix_collector))
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new_fs = marisa_trie.Trie(__new_fs(base_trie, new_added, new_removed))
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return (new_fs, new_added, new_changed, new_removed.keys())
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