controller to run as non root user

[denniswa]

Currently the controller runs as root and that should not be necessary

[JohannesGarm]

Currently this error is thrown when you try to run as a non-root user:

Feb 04 12:39:49 nsolab-02 clixon_backend[916711]: Feb  4 12:39:49.795227: drop_priv_perm:222: uid:1010
Feb 04 12:39:49 nsolab-02 clixon_backend[916711]: Feb  4 12:39:49.795255: drop_priv_perm: 225: UNIX error: setresuid: Operation not permitted
Feb 04 12:39:49 nsolab-02 clixon_backend[916711]: Feb  4 12:39:49.795270: clixon_event_loop: 470: Event error: select: Bad file descriptor
Feb 04 12:39:49 nsolab-02 clixon_backend[916711]: Feb  4 12:39:49.795285: clixon_backend: 916711 Terminated retval:-1
Feb 04 12:39:49 nsolab-02 clixon_backend[916711]: drop_priv_perm: 225: UNIX error: setresuid: Operation not permitted
Feb 04 12:39:49 nsolab-02 clixon_backend[916711]: clixon_event_loop: 470: Event error: select: Bad file descriptor
Feb 04 12:39:49 nsolab-02 clixon_backend[916711]: clixon_backend: 916711 Terminated retval:-1

From Olof on slack:

Its not supported. The problem is you need to access all privileged resources before you drop to a lower privileged level. But the controller opens new resources for example when accessing a new device. This needs some work and has not been done. Til then, it is not supported, you need to run as root.