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I have a bind mount in fstab which makes certain files visible within the filesystem of a snap application (MuseScore)

/path/to/real/files /home/me/MuseScore3Development/Scores none defaults,bind,users 0 0

This was working for a while, i.e. /path/to/real/files/foo.mscz was visible in /home/me/MuseScore3Development/Scores to the application.

Now,

#> mount | grep Scores                                  
/dev/sda3 on /home/me/MuseScore3Development/Scores type ext4 (rw,nosuid,nodev,noexec,relatime)

seems to indicate that it is mounted, but

ls /home/me/MuseScore3Development/Scores

shows nothing whereas

ls /path/to/real/files

shows the expected files. But if I save a file from the application it appears in /home/me/MuseScore3Development/Scores

Also

#> sudo umount /home/me/MuseScore3Development/Scores`
Could not unlink the key(s) from your keying. Please use `keyctl unlink` if you wish to remove the key(s). Proceeding with umount.
umount: /home/me/MuseScore3Development/Scores: not mounted.

mount | grep Scores


/dev/sda3 on /home/me/MuseScore3Development/Scores type ext4 (rw,nosuid,nodev,noexec,relatime)
  1. Why does it say not mounted desppite clearly being still mounted?
  2. Why do the files in the source directory not appear in the mount point?
  3. What does keyctl have to do with any of this?
  4. What sequence of events plausible caused this situation, and how do I avoid this problem in the future?
spraff
  • 2,458

0 Answers0