crashes when using foreign database

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Hi,

since a few iterations of the current git master I expericence crashes
when some files in the .thumbnails (or .videothumbnails) folders have
the wrong owner or strange permissions.

This mix of owners happens quite often here, as we share our KPA
databases via NFS. So if someone imports some new images into the family
album, the new thumbnails (and images) will belong to her.

The images have rw-r--r-- ownership by default (?), so they are readable
by all (we share the same group). I have manually set the .-folders to
rwxrwxr-x, so that anybody in the users group can write.

It seems to me that KPA tries to recreate all thumbnails if the
ownership of some of these files do not match the current owner. Then it
will invariably hit some files with the orignal rw-r--r-- settings and
crash.

a) Why does KPA start rebuilding the thumbnails in first place? The
rebuild starts each time somebody else accesses the DB. It should just
take the thumbnails that are present and live with them.

b) Could we not define somewhere in the settings, how we want the
permissions to be? Right now the permissions seem to be set by some
system dependent magic.

c) I know, that the thumbnail-size is set in the .config/kphotoalbumrc -
probably differently for each user.


Alas, I did some more testing (all on a DB not owned by me) permission
changes done as root, KPA used as myself:

1. set all permissions in .thumbnails to rw-rw-r--

2. open the foreign DB.

3. ./thumbnails/thumbnailindex gets recreated by me. (why?)

4. close the DB

6. change owner back to the original: beate:users

7. change permissions to rw-r--r--:

wshome5:/home/beate/Handy-Bilder # ll .thumbnails/
insgesamt 41650
-rw-r--r-- 1 beate users 33556331 25. Mai 11:13 thumb-0
-rw-r--r-- 1 beate users=C2=A0 9156333 12. Okt 2020=C2=A0 thumb-1
-rw-r--r-- 1 beate users=C2=A0=C2=A0 310330 25. Mai 11:14 thumbnailindex

 =C2=A0=C2=A0=C2=A0 (I was having a break inbetween)

8. open the DB again as myself and do some minor adjustments (rotate a
few images): The thumbnails vanish (as the files are not writable by me)

9. close the DB again and look at the folder:

wshome5:/home/beate/Handy-Bilder # ll .thumbnails/
insgesamt 41650
-rw-r--r-- 1 beate users 33556331 25. Mai 11:13 thumb-0
-rw-r--r-- 1 beate users=C2=A0 9156333 12. Okt 2020=C2=A0 thumb-1
-rw-rw-r-- 1 as=C2=A0=C2=A0=C2=A0 users=C2=A0=C2=A0 310060 25. Mai 14:24 t=
humbnailindex
wshome5:/home/beate/Handy-Bilder #

10. This is most unexpected: the thumbnailindex get new permissions and
new owner (me) - but I did not have write permissions on this file (only
on the folder).


I know, all this sounds a bit garbled. It is not meant to be a "real"
bug message, even if a crashreport is attached, but more to express my
general pain with the thumbnails in KPA.

I have seen some discussions about improving handling of thumbnails in
the past. Maybe one could take into account these quirks and try to
handle things differently. However, I have no solution.


My user story is:

- have a db shared between multiple users in the same group.

- the db may reside on a remote file system

- users use various PCs to access the db

- the same PC is shared by multiple users

- all users add to and edit (tag images) the db from the same or from
different PCs

- the users might have different preferences for their thumbnail size

- the same user might have different preferences on different machines,
as they have different screen sizes

- in my current setup, it takes >1h to recreate the thumbnails for 40k
images (so I don't want to do this often).


Best regards, Andreas


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