bugGNU Core Utilities - Bugs: bug #25538, excluded files are still stat()ed


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bug #25538: excluded files are still stat()ed

Submitter:  Kevin Pulo <devkev>
Submitted:  Tue 10 Feb 2009 04:24:35 AM UTC
Category:  None Severity:  3 - Normal
Item Group:  None Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open

Tue 10 Feb 2009 04:24:35 AM UTC, original submission:  

My problem is that files I have excluded from du using -X or --exclude still have stat() run on them.  In particular, this is a problem when trying to exclude some fuse filesystems on Linux, eg. sshfs and encfs, which deny all access to other users (including root).

For example:

root@bebique:~# du -axk /home/kev/mnt/sf
du: cannot access `/home/kev/mnt/sf/home': Permission denied
4       /home/kev/mnt/sf
root@bebique:~# du -axk --exclude=/home/kev/mnt/sf/home /home/kev/mnt/sf
du: cannot access `/home/kev/mnt/sf/home': Permission denied
4       /home/kev/mnt/sf
root@bebique:~# echo $?

The non-zero exit status is particularly troubling, since it means I cannot chain other commands after du using '&&' whenever it's operating on a tree that has these sorts of fuse fs's in it.

The only workaround at the moment is to exclude the parent directory, eg. --exclude=~kev/mnt/sf in the example above.  This unfortunately means that everything else in that directory is also excluded.

root@bebique:~# du -axk --exclude=/home/kev/mnt/sf /home/kev/mnt/sf
root@bebique:~# echo $?

Having looked at the code, I'm not sure how this would best be fixed.  The list of excluded files is only used in process_file(), which is too late.  I presume that the stat() is happening inside fts_read(), which populates end->fts_statp with the results of the stat() call.  I suppose that extending fts_read() to also respect the exclusion list would be fairly invasive.  Alternatively, the EPERM could persist during the fts_read(), but then be somehow "forgotten about" later for excluded files, allowing the exit status to return to being 0 (assuming no other genuine errors).

Kevin Pulo <devkev>


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