gthumb doesn't re-scan thumbnails when permissions change

Thanks for your bug report, but I do not quite understand. First of all: which version of Ubuntu and gthumb do you use?

1) I changed to not have read permissions, as a result I got an error message from gthumb telling me that I can't look at the pictures
2) I changed to have read permissions and could have a look at the pictures.

What exactly is the problem? And please give detailed steps to reproduce the problem. Thanks.

gthumb version: 2.7.3-0ubuntu3
Hi Daniel,

Sorry for not making my report clearer. It is not the directory that I don't have read access to; it is the pictures.

1. First off you must start with a picture that you do not have read access to and that gthumb has not browsed previously so that the thumbnail is the "tree and the sunset" icon.

2. Then "chmod a+r" on the picture and gthumb will not change the icon to a thumbnail of the picture.

The only way I can see to get gthumb to build the thumbnail is rename the file or modify it.

This situation I find is typical when you share a computer with another user.

I hope that is clearer
Thanks.

Could you try with 2.7.5.1 once it hits the archive?

Tried 2.7.5.1 but no difference:

1. copied abc.jpg to xyz.jpg, change owner and permissions on xyz.jpg to root 600.

2. opened gthumb no thumbnail for xyz.jpg as expected.

3. chown and chmod back to me for xyz.jpg but still no thumbnail.

4. Tried <Ctrl>-R, still no thumbnail.

5. "touch"ed file, now thumbnail appears.

Thanks for following up, I reported the issue to the upstream developers: http://bugzilla.gnome.org/show_bug.cgi?id=335496

From: http://bugzilla.gnome.org/show_bug.cgi?id=335496#c1
The thumbnailing code determines the thumbnail "freshness" based on the file
mtime. chmod doesn't change the mtime, but touch does.

It isn't worth the added complexity to track the ctime too (which changes when
permissions are changed). We use GnomeThumbnail (from libgnomeui), which relies
on mtime.

This is a deliberate design choice, so I'm marking it as "NOTABUG".