Comment # 12 on bug 904215 from Johannes Meixner

Thomas Blume,

when after RPM package upgrade a systemd unit file does no longer exist
(because it is no longer provided by the new RPM), then
"systemctl daemon-reload" does not clean up its dangling symlinks.

On my 13.2 system:
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# file /etc/systemd/system/sockets.target.wants/iscsid.socket
/etc/systemd/system/sockets.target.wants/iscsid.socket:
 symbolic link to `/usr/lib/systemd/system/iscsid.socket'

# systemctl status iscsid.socket
iscsid.socket - Open-iSCSI iscsid Socket
Loaded: loaded (/usr/lib/systemd/system/iscsid.socket; enabled)
Active: active (listening) since Thu 2014-11-06 12:47:43 CET; 3h 58min ago
  Docs: man:iscsid(8)
        man:iscsiadm(8)
Listen: @ISCSIADM_ABSTRACT_NAMESPACE (Stream)

# mv /usr/lib/systemd/system/iscsid.socket \
 /usr/lib/systemd/system/iscsid.socket.away

# systemctl status iscsid.socket
iscsid.socket - Open-iSCSI iscsid Socket
Loaded: loaded (/usr/lib/systemd/system/iscsid.socket; enabled)
Active: active (listening) since Thu 2014-11-06 12:47:43 CET; 3h 58min ago
  Docs: man:iscsid(8)
        man:iscsiadm(8)
Listen: @ISCSIADM_ABSTRACT_NAMESPACE (Stream)
Warning: Unit file changed on disk, 'systemctl daemon-reload' recommended.

# systemctl daemon-reload

# systemctl status iscsid.socket
iscsid.socket
Loaded: not-found (Reason: No such file or directory)
Active: active (listening) since Thu 2014-11-06 12:47:43 CET; 3h 59min ago

# file /etc/systemd/system/sockets.target.wants/iscsid.socket
/etc/systemd/system/sockets.target.wants/iscsid.socket:
 broken symbolic link to `/usr/lib/systemd/system/iscsid.socket'
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Therefore I ask again:
when after RPM package upgrade a systemd unit file does no longer exist
(because it is no longer provided by the new RPM), what is the right way
to let systemd adapt to the new situation?