systemd-nspawn --link-journal=host only works once

[smurfix]

systemd-nspawn --link-journal=host should accept an existing directory.

root@iron:~# systemctl start systemd-nspawn@foo
[ everything works ]
root@iron:~# systemctl stop systemd-nspawn@foo
root@iron:~# systemctl start systemd-nspawn@foo
[ fails ]
root@iron:~# systemctl status -l systemd-nspawn@foo
● systemd-nspawn@foo.service - Container foo
   Loaded: loaded (/lib/systemd/system/systemd-nspawn@.service; enabled; vendor preset: enabled)
  Drop-In: /etc/systemd/system/systemd-nspawn@.service.d
           └─smurf.conf
   Active: failed (Result: exit-code) since Do 2015-12-17 13:00:33 CET; 7s ago
     Docs: man:systemd-nspawn(1)
  Process: 12750 ExecStart=/usr/bin/systemd-nspawn --quiet --network-bridge=br0 --network-veth-extra=vb-%i:host443 --keep-unit --boot --link-journal=host --directory=/d/vm/%i --bind=/var/cache (code=exited, status=1/FAILURE)
 Main PID: 12750 (code=exited, status=1/FAILURE)
   Status: "Terminating..."

Dez 17 13:00:33 iron systemd[1]: Starting Container foo...
Dez 17 13:00:33 iron systemd-nspawn[12750]: mount(/d/vm/foo/sys/fs/selinux) failed, ignoring: No such file or directory
Dez 17 13:00:33 iron systemd-nspawn[12750]: mount(/d/vm/foo/sys/fs/selinux) failed, ignoring: Invalid argument
Dez 17 13:00:33 iron systemd-nspawn[12750]: /etc/localtime is not a symlink, not updating container timezone.
Dez 17 13:00:33 iron systemd-nspawn[12750]: Failed to create /var/log/journal/15bfd317d6044649beb2e509acfd0cac: File exists
Dez 17 13:00:33 iron systemd[1]: systemd-nspawn@foo.service: Main process exited, code=exited, status=1/FAILURE
Dez 17 13:00:33 iron systemd[1]: Failed to start Container foo.
Dez 17 13:00:33 iron systemd[1]: systemd-nspawn@foo.service: Unit entered failed state.
Dez 17 13:00:33 iron systemd[1]: systemd-nspawn@foo.service: Failed with result 'exit-code'.
root@iron:~# ls -l /var/log/journal/15bfd317d6044649beb2e509acfd0cac
total 8192
-rw-r-----+ 1 root netdev 8388608 Jan 18  2015 system.journal
root@iron:~# rm -r /var/log/journal/15bfd317d6044649beb2e509acfd0cac
root@iron:~# systemctl start systemd-nspawn@foo
[ everything works ]
root@iron:~# 

[poettering]

Fix waiting in #2466