[HTCondor-users] CONDOR_IDS = 0.0 and "user" jobs

[Dirk Sammel <dirk.sammel@xxxxxxxxxxxxxxxxxxxxxx>]

Dear experts,

we're operating an ARC-CE with HTCondor as LRMS.
According to the ARC documentation "CONDOR_IDSÂhas to be 0.0, so that 
Condor will be run as root and can then access the Grid jobâs session 
directories (needed to extract various information from the job log)." 
(https://www.nordugrid.org/arc/arc6/admins/details/lrms.html#id5)

Now we wanted to submit some test jobs directly to HTCondor, but we see 
this in the ShadowLog:

06/18/25 06:49:15 (1565096.0) (1241574): ERROR: Attempt to initialize 
user_priv with root privileges rejected
06/18/25 06:49:15 (1565096.0) (1241574): init_user_ids() failed as user 
dsadmin
06/18/25 06:49:15 (1565096.0) (1241574): ERROR "Programmer Error: 
attempted switch to user privilege, but user ids are not initialized" at 
line 1605 in file 
/var/lib/condor/execute/slot1/dir_2606725/userdir/build-qRBc1D/BUILD/condor-24.0.7/src/condor_utils/uids.cpp


We also tried to submit as root, but then we get

ERROR: Failed to commit job submission into the queue.
ERROR: Setting job owner to "root" is not permitted


I found an old mail thread 
(https://www-auth.cs.wisc.edu/lists/htcondor-users/2017-March/msg00113.shtml) 
and if I understand it correctly, the source of our issue is CONDOR_IDS 
= 0.0.
It is also mentioned in the mail thread (and in the HTCondor 
documentation), that HTCondor switches to root if necessary.

So my question is: is the claim in the ARC-CE documenation (still) 
valid, that CONDOR_IDS = 0.0 is necessary or is HTCondor able to read 
the session directories anyway?
And if this is really necessary, is there any other solution to our problem?

Cheers
Dirk