[systemd-devel] systemd-run --user when lingering is disabled.

[Steve Traylen]

Example with lingering **disabled**

root>  systemd-run  --service-type=exec   --user  --machine eric at .host 
/usr/bin/sleep 1m

With this

The systemd --user instance is started for Eric and also the sleep is 
started.

However after < 10 seconds or so the transient unit and user service is 
all shutdown taking the sleep with it.

Logs:

Sep 09 12:54:43 fedora systemd[1]: Created slice user-1001.slice - User 
Slice of UID 1001.
Sep 09 12:54:43 fedora systemd[1]: Starting 
user-runtime-dir at 1001.service - User Runtime Directory /run/user/1001...
Sep 09 12:54:43 fedora systemd[1]: Finished 
user-runtime-dir at 1001.service - User Runtime Directory /run/user/1001.
Sep 09 12:54:43 fedora systemd[1]: Started user at 1001.service - User 
Manager for UID 1001.

Sep 09 12:54:43 fedora dbus-broker-launch[5340]: Ready
Sep 09 12:54:43 fedora systemd[5318]: Starting run-u0.service - 
/usr/bin/sleep 1m...
Sep 09 12:54:43 fedora systemd[5318]: Started run-u0.service - 
/usr/bin/sleep 1m.
Sep 09 12:54:43 fedora (sd-pam)[5338]: pam_selinux(login:session): 
Setting file context "unconfined_u:object_r:user_devpts_t:s0" failed for 
/dev/pts/1: Operation not permitted
Sep 09 12:54:43 fedora systemd[1]: run-u262.service: Deactivated 
successfully.
Sep 09 12:54:43 fedora audit[1]: SERVICE_STOP pid=1 uid=0 
auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 
msg='unit=run-u262 comm="systemd" exe="/usr/lib/systemd/systemd" 
hostname=? addr=? terminal=? res=success'
Sep 09 12:54:43 fedora (sd-pam)[5338]: pam_unix(login:session): session 
closed for user eric
Sep 09 12:54:43 fedora systemd[1]: session-26.scope: Deactivated 
successfully.

...
Sep 09 12:54:53 fedora systemd[1]: Stopping user at 1001.service - User 
Manager for UID 1001...
Sep 09 12:54:53 fedora systemd[5318]: Activating special unit exit.target...


I would have hoped the `systemd --user` instance to hang around as long 
as systemd-run sleep invocation.

Enabling linger first and then all is good. Would rather not enable linger.
Switching to `--service-type` one shot also works but then the 
systemd-run is sync rather than async.

Motivation - Trying to move away from `echo "/usr/bin/sleep 1m" | su - 
eric  - & `.

Steve.

Tested on fedora rawhide, systemd-256.5.