Umask not working

[efajardo]

Justas reported on freshdesk ticket #65647. That the umasking feature it is not working:

[root@transfer-10 justas]# cat /usr/lib/systemd/system/xrootd-privileged\@.service | grep UMask
UMask=0002
[root@transfer-10 justas]# cat /etc/xrootd/xrootd-clustered.cfg | grep umask
multiuser.umask 0002
Copy file
-bash-4.2$ gfal-copy -K ADLER32 -p -f justas root://transfer-10.ultralight.org//storage/justas/umask0002
Copying file:///storage/user/jbalcas/justas   [DONE]  after 0s
On storage:
[root@transfer-10 justas]# ll /storage/justas/
total 1
-rw-r--r-T 1 cmsuser cmsuser 6 Sep 28 16:14 umask0002
so umask is somehow not used. I also tried to change 0001, same effect. Do I miss something else to change?
[root@transfer-10 ~]# ll /storage/justas/
total 1
-rw-r--r-T 1 cmsuser cmsuser 6 Sep 28 16:32 umask0001
-rw-r--r-T 1 cmsuser cmsuser 6 Sep 28 16:14 umask0002

[djw8605]

With the tracing on high enough, it should print out the umask it was going to use, as in this line: https://github.com/opensciencegrid/xrootd-multiuser/blob/master/src/multiuser.cpp#L539

It looks like the umask only happens when it uses the default xrootd umask. I suppose it's possible that gfal is doing something weird with setting the xrootd umask? Could you try the same command with the raw xrdcp command?

[juztas]

Seems most of it works (and for my needs it is enough). Changing umask on xrootd server config and do transfer with gfal-copy:

[root@transfer-10 ~]# ll /storage/eck4m1/
total 8192
-rw-rw-r-- 1 cmsuser cmsuser 1048576 Oct 29 08:20 umask0001
-rw-rw-r-- 1 cmsuser cmsuser 1048576 Oct 29 08:20 umask0002
-rw-rw---- 1 cmsuser cmsuser 1048576 Oct 29 08:22 umask0006
-rw-rw---- 1 cmsuser cmsuser 1048576 Oct 29 08:22 umask0007
-rw-r----- 1 cmsuser cmsuser 1048576 Oct 29 08:23 umask0027
-rw------- 1 cmsuser cmsuser 1048576 Oct 29 08:24 umask0067
-rw----r-- 1 cmsuser cmsuser 1048576 Oct 29 08:27 umask0070
-rw------- 1 cmsuser cmsuser 1048576 Oct 29 08:25 umask0077

Also changing this at systemd Umask looks ok (while xrootd config is not setting it)

[root@transfer-10 eck4m1]# ll /storage/eck4m1/*service
-rw-rw-r-- 1 cmsuser cmsuser 1048576 Oct 29 08:44 /storage/eck4m1/umask0000-service
-rw-rw---- 1 cmsuser cmsuser 1048576 Oct 29 08:45 /storage/eck4m1/umask0007-service
-rw------- 1 cmsuser cmsuser 1048576 Oct 29 08:46 /storage/eck4m1/umask0077-service

Even I am still confused why if I use UMask 0000, it becomes 664 - but simply seems there is umask set somewhere else which takes precedence. I think it is good to close this issue (there is no real issue here).

[djw8605]

I'm confused (though happy to close this issue). You said at first it wasn't working, but now you are saying that the umask in the XRootD config does work?

[juztas]

In my first try, I tested only 002 and 001, but not other umasks, while in second I tried many other umasks. Based on every possible umask (https://www.linuxtrainingacademy.com/all-umasks/), I can only assume that xrootd is not changing (lowering) umask (default is 002) or is it Linux not doing this/not allowing? And because I tested in a first try only 002 and 001 - these two have no difference (as default is 002). All other work as it should.

001 - should be rw-rw-rw-, while xrootd sets rw-rw-r--
002 - should be rw-rw-r--, while xrootd sets rw-rw-r--
006 - should be rw-rw----, while xrootd sets  -rw-rw----
077 - should be rw------, while xrootd sets rw-------

[djw8605]

Thanks Justas.