extract_item: do not delete an existing directory if possible #7866
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A pre-existing directory might be a Btrfs subvolume that was created by the user ahead of time when restoring several nested subvolumes from a single archive.
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## master #7866 +/- ##
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| elif not stat.S_ISDIR(item.mode): | ||
| os.rmdir(path) |
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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.
| 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.
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A small test with an existing fs dir and then extracting "over" that would be good. |
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@intelfx can you add tests? |
A pre-existing directory might be a Btrfs subvolume that was created by the user ahead of time when restoring several nested subvolumes from a single archive.
I'm also interested in this feature being backported to Borg 1.2. I have a patch that applies on top of
1.2-maint.See: #4233