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extract_item: do not delete an existing directory if possible #7866

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extract_item: do not delete an existing directory if possible #7866

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9 changes: 6 additions & 3 deletions src/borg/archive.py
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Original file line number Diff line number Diff line change
Expand Up @@ -858,10 +858,13 @@ def same_item(item, st):
st = os.stat(path, follow_symlinks=False)
if continue_extraction and same_item(item, st):
return # done! we already have fully extracted this file in a previous run.
elif stat.S_ISDIR(st.st_mode):
os.rmdir(path)
else:
# remove anything that is not a directory
if not stat.S_ISDIR(st.st_mode):
os.unlink(path)
# only remove a directory if it is conflicting
# preserve existing directories because they might be subvolumes
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is subvolumes a feature implemented by other fs than btrfs?

if not, maybe we better call it "btrfs subvolumes" here, so it is more clear.

elif not stat.S_ISDIR(item.mode):
os.rmdir(path)
Comment on lines +866 to +867
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@ThomasWaldmann ThomasWaldmann Oct 10, 2023 •
edited
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It's rather unclear still whether the resulting directory after extraction will be correct (== as in the archive) in all cases:

  • simple attrs
  • xattrs
  • acls
  • (bsd/fs)flags

The existing directory could have some metadata set already, but the resulting directory must be exactly what we have in the archived item, not a mix up of fs item and archived item.

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The code that makes sure about this could be also useful later if we implement extracting into a non-empty directory (for more than the simplest cases, like the already implemented "continue an extraction").

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hmm, thinking about it...

we currently more or less require extracting into an empty dir (exception: that "continue extraction" feature). we could also require that if there is any pre-existing directory inside the extraction directory, it must not have any special attrs set.

except UnicodeEncodeError:
raise self.IncompatibleFilesystemEncodingError(path, sys.getfilesystemencoding()) from None
except OSError:
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