49 lines
2.5 KiB
Markdown
49 lines
2.5 KiB
Markdown
I was copying files to a directory remote with `git annex copy`. Out of 114 files, 9 of them failed with no message, just:
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copy data/foo.dat (to usbdrive...) failed
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copy data/bar.dat (to usbdrive...) failed
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According to strace:
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31338 mkdir("/media/annex/Zp/9v/SHA256-s1362999320--d650297c8cf8c2dc0575110a52d0c5cc0ff266f294a0599f85796a6b44b23492", 0777) = -1 ENOENT (No such file or directory)
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31338 mkdir("/media/annex/Zp/9v", 0777) = -1 ENOENT (No such file or directory)
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31338 mkdir("/media/annex/Zp", 0777) = -1 EEXIST (File exists)
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31338 stat("/media/annex/Zp", 0x7f8449f170d0) = -1 ENOENT (No such file or directory)
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The filesystem is FAT32 and has weird case semantics. This was mounted by udisks with its default options:
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/dev/sdb1 on /media/annex type vfat (rw,nosuid,nodev,uhelper=udisks,uid=1000,gid=1000,shortname=mixed,dmask=0077,utf8=1,showexec)
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I wonder if the directory remote should use hashDirLower instead of hashDirMixed?
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> git-annex intentionally uses the same layout for directory and rsync
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> special remotes as it does for the .git/annex directory. As far
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> as I know it works ok on (truely) case-insensative filesystems.
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>
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> Based on your strace, if you `ls /media/annex/Zp`, you will see
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> "No such file or directory", but if you `mkdir /media/annex/Zp` it will
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> fail with "File exists". Doesn't make much sense to me.
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>
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> The (default) VFAT mount option shortname=mixed causes this behavior.
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> With shortname=lower it works ok. --[[Joey]]
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>
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>> So, the options for fixing this bug seem to be to fix Linux (which would
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>> be a good idea IMHO but I don't really want to go there), or generally
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>> convert git-annex to using lowercase for its hashing (which would be a
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>> large amount of pain to rewrite all the symlinks in every git repo),
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>> or some special hack around this problem.
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>>
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>> I've put in a workaround for the problem in the directory special
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>> remote; it will use mixed case but fall-back to lowercase as necessary.
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>>
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>> That does leave the case of a bare git repository with annexed content
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>> stored on VFAT. More special casing could fix it, but that is, I
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>> think, an unusual configuration. Leaving the bug open for that case,
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>> and for the even more unlikely configuration of a rsync special remote
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>> stored on VFAT. --[[Joey]]
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>>> Bare repositories now use lowercase. rsync is the only remaining
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>>> unsupported possibility. --[[Joey]]
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>>>> Everything now uses lowercase, with the exception of non-bare
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>>>> repos, which cannot be on FAT anyway due to using symlinks. [[done]]
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>>>> --[[Joey]]
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