https://bugs.kde.org/show_bug.cgi?id=438128
Bug ID: 438128
Summary: Permissions of index.xml and
.thumbnails/thumbnailindex change to inconsistent
settings
Product: kphotoalbum
Version: GIT master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kpab...@willden.org
Reporter: schleth...@web.de
Target Milestone: ---
SUMMARY
Using a database with more than one user needs appropriate permissions if you
will allow others to tag images or even add images to the DB.
index.xml should be rw-rw-... for people in the group to be able to tag and
save.
.thumbnails/* should either be rw-r--... or rw-rw-... (the fist allows only 1
person to update the thumbnails, the second allows that for all).
Unfortunately KPA changes the setting of index.xml to rw-r--...
of .thumbnails/thumbnailindex to rw-rw-...
and of .thumbnails/thumb-0 to rw-r--...
When other users access the DB and do changes, the ownership of files will
change too. This is a problem, when at the same time the permissions are set to
more restrictive settings than before (rw-rw- to rw-r--).
Here is a log (with the unnecessary lines deleted):
as@wshome5:~/Lokal/tmp/testkpa> ll -a
-rw-rw-r-- 1 as users 45056 5. Jun 17:34 exif-info.db
-rw-rw-r-- 1 as users 21038 5. Jun 17:35 index.xml
drwxrwxr-x 2 as users 4096 5. Jun 17:34 t1
drwxr-xr-x 2 as users 4096 5. Jun 17:35 .thumbnails
as@wshome5:~/Lokal/tmp/testkpa> chmod g-w .thumbnails/*
as@wshome5:~/Lokal/tmp/testkpa> ll .thumbnails/
-rw-r--r-- 1 as users 1082721 5. Jun 17:34 thumb-0
-rw-r--r-- 1 as users 6322 5. Jun 17:35 thumbnailindex
as@wshome5:~/Lokal/tmp/testkpa> cp ../Day201004/I09993* t1
as@wshome5:~/Lokal/tmp/testkpa> kphotoalbum -c index.xml
--- view the new files as the original owner and save ---
as@wshome5:~/Lokal/tmp/testkpa> ll -a
-rw-r--r-- 1 as users 35138 5. Jun 17:38 index.xml <== permissions have
changed
drwxrwxr-x 2 as users 12288 5. Jun 17:37 t1
drwxr-xr-x 2 as users 4096 5. Jun 17:38 .thumbnails
as@wshome5:~/Lokal/tmp/testkpa> ll .thumbnails/
insgesamt 1772
-rw-r--r-- 1 as users 1801984 5. Jun 17:38 thumb-0
-rw-rw-r-- 1 as users 10922 5. Jun 17:38 thumbnailindex <== permissions
have changed
--- Now I reset everything to rw-rw-... (also the thumbnails) and add a few
images as another user (test)
as@wshome5:~/Lokal/tmp/testkpa> ll -a
-rw-r--r-- 1 test users 79638 5. Jun 17:52 index.xml <== permissions AND
owner have changed
-rw-rw-r-- 1 as users 7268 5. Jun 17:48 index.xml~0003~.zip
-rw-r--r-- 1 test users 10048 5. Jun 17:52 index.xml~0004~.zip
drwxrwxr-x 2 as users 20480 5. Jun 17:52 t1
drwxrwxr-x 2 as users 4096 5. Jun 17:53 .thumbnails
as@wshome5:~/Lokal/tmp/testkpa> ll .thumbnails/
insgesamt 3352
-rw-r--r-- 1 test users 3403652 5. Jun 17:53 thumb-0 <== permissions
and owner have changed
-rw-rw-r-- 1 test users 24722 5. Jun 17:53 thumbnailindex <== owner has
changed
--- reset the ownership and permissions to "admin-only" settings (still
letting others tag and save):
as@wshome5:~/Lokal/tmp/testkpa> ll -a
-rw-rw-r-- 1 as users 79638 5. Jun 17:52 index.xml
drwxr-xr-x 2 as users 4096 5. Jun 17:53 .thumbnails
as@wshome5:~/Lokal/tmp/testkpa> ll .thumbnails/
-rw-r--r-- 1 as users 3403652 5. Jun 17:53 thumb-0
-rw-r--r-- 1 as users 24722 5. Jun 17:53 thumbnailindex
--- let the other user do stuff (add images and tag something)
--- rebuilding the thumbnails fails (predictably) for the other user
as@wshome5:~/Lokal/tmp/testkpa> ll -a
-rw-r--r-- 1 test users 94846 5. Jun 18:14 index.xml <== permissions and
owner have changed
--- look at the database as original owner (as) tag and save
as@wshome5:~/Lokal/tmp/testkpa> ll -a
-rw-r--r-- 1 as users 143004 5. Jun 18:18 index.xml <== owner has
changed (magic!)
as@wshome5:~/Lokal/tmp/testkpa> ll .thumbnails/
insgesamt 4212
-rw-r--r-- 1 as users 4276567 5. Jun 18:18 thumb-0
-rw-rw-r-- 1 as users 29322 5. Jun 18:18 thumbnailindex <== new thumbs have
been generated (but permissions have changed again!)
OBSERVED RESULT
I see inconsistent settings in .thumbnails (the auto-settings are different for
thumb-0 and thumbnailindex)
I see changes of ownership of these files and of the index.xml file
I see change in permissions and ownership of the index.xml file which seem to
have no effect whatsoever (the magic lies in the backup files).
EXPECTED RESULT
When I set the permissions to some value, I expect them to stay the way I set
them.
However, I understand that the permissions on the index file are kept in the
backup files and each index file is in effect a new copy (thus the magic).
Allowing write access to a file, I do not expect the file to change ownership
(and permissions).
I especially do not like the different settings for the content of .thumbnails
(rw-r-- for the thumb-0 and rw-rw- for the thumbnailindex).
I could live with the "admin settings", because then nobody could trash the
thumbnails. Normally this does not happen as the thumb-0 file is still write
protected. Disaster is waiting to happen, if the thumb-0 file is just "full"
and another thumb-1 files is created by the other user.
The "magic" with the index files does not work with the thumb-X files. Thus the
other user will just "take them away from me" when I allow her write access.
CHANGE I WOULD WISH FOR
When the thumb-X files are RW for the group they must stay so (even if somebody
else becomes the owner).
Changing the owner of existing files is not nice.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: openSuse Leap 15.2
KPA: v5.7.0-264-g36a530b7
KDE Frameworks 5.71.0
Qt 5.12.7 (kompiliert gegen 5.12.7)
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