Shell rc.d daemon stop as user

[weberjn]

Playing with the misc/openhab rc script (https://cgit.freebsd.org/ports/tree/misc/openhab/files/openhab.in).

The rc magic starts daemon under the openhab user:

limits -C daemon su -m openhab -c 'sh -c "/usr/sbin/daemon  -p /var/run/openhab/openhab.pid -c -t openhab /usr/local/libexec/openhab/start.sh server"'

but to stop or status you have to explicitly su, right?

openhab_stop() {
        su -m ${openhab_user} -c "${OPENHAB_RUNTIME}/bin/stop"

 

[gpw928]

Each of the commands limits(1), daemon(8), and su(1) have the purpose of modifying the environment and then executing another command within that environment. In particular, limits -C daemon applies process resource limits for su -m openhab -c 'command' which runs the 'command' using the UID of user "openhab_user" where 'command' is: sh -c "/usr/sbin/daemon -p /var/run/openhab/openhab.pid -c -t openhab /usr/local/libexec/openhab/start.sh server"

So, as you imply, the openhab daemon is being run under the UID of the user "openhab_user". To verify this assertion, examine the ownership of the PID file /var/run/openhab/openhab.pid.

An su -m ${openhab_user} in the stop function is of no use. If your UID is root, or "openhab_user", you don't need it. Otherwise, you don't have permission to stop the daemon.