healthcheck: support rootless mode

[giuseppe]

now that dbus authentication works fine from a user namespace (systemd
241 works fine), we can enable rootless healthchecks.

It uses "systemd-run --user" for creating the healthcheck timer and
communicates with the user instance of systemd listening at
$XDG_RUNTIME_DIR/systemd/private.

Closes: #3523

Signed-off-by: Giuseppe Scrivano gscrivan@redhat.com

[openshift-ci-robot]

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[stefanb2]

Looks like this fixes this issue:

$ podman run --name=docker_mongo_3_4_7 -d ... --healthcheck-command /bin/sh -c docker-healthcheck docker.COMPANY.COM:5004/PATH/mongo:3.4.7 --smallfiles
922d1277cc48418620843ecdc2ea1447c2cbd1322eaa0be5b8fe5c8fbc15e99c

$ systemctl --user status 922d1277cc48418620843ecdc2ea1447c2cbd1322eaa0be5b8fe5c8fbc15e99c
● 922d1277cc48418620843ecdc2ea1447c2cbd1322eaa0be5b8fe5c8fbc15e99c.service - /usr/bin/podman healthcheck run 922d1277cc48418620843ecdc2ea1447c2cbd1322eaa0b>
   Loaded: loaded (/run/user/1000/systemd/transient/922d1277cc48418620843ecdc2ea1447c2cbd1322eaa0be5b8fe5c8fbc15e99c.service; transient)
Transient: yes
   Active: inactive (dead) since Tue 2019-07-09 15:30:50 EEST; 6s ago
  Process: 17103 ExecStart=/usr/bin/podman healthcheck run 922d1277cc48418620843ecdc2ea1447c2cbd1322eaa0be5b8fe5c8fbc15e99c (code=exited, status=0/SUCCESS)
 Main PID: 17103 (code=exited, status=0/SUCCESS)

heinä 09 15:30:50 beckst-lnx systemd[1641]: Started /usr/bin/podman healthcheck run 922d1277cc48418620843ecdc2ea1447c2cbd1322eaa0be5b8fe5c8fbc15e99c.
heinä 09 15:30:50 beckst-lnx podman[17103]: healthy
heinä 09 15:30:50 beckst-lnx systemd[1641]: 922d1277cc48418620843ecdc2ea1447c2cbd1322eaa0be5b8fe5c8fbc15e99c.service: Succeeded.

$ systemctl --user status 922d1277cc48418620843ecdc2ea1447c2cbd1322eaa0be5b8fe5c8fbc15e99c.timer
● 922d1277cc48418620843ecdc2ea1447c2cbd1322eaa0be5b8fe5c8fbc15e99c.timer - /usr/bin/podman healthcheck run 922d1277cc48418620843ecdc2ea1447c2cbd1322eaa0be5>
   Loaded: loaded (/run/user/1000/systemd/transient/922d1277cc48418620843ecdc2ea1447c2cbd1322eaa0be5b8fe5c8fbc15e99c.timer; transient)
Transient: yes
   Active: active (waiting) since Tue 2019-07-09 15:26:10 EEST; 5min ago
  Trigger: Tue 2019-07-09 15:31:51 EEST; 19s left

heinä 09 15:26:10 beckst-lnx systemd[1641]: Started /usr/bin/podman healthcheck run 922d1277cc48418620843ecdc2ea1447c2cbd1322eaa0be5b8fe5c8fbc15e99c.

$ podman container inspect --format '{{json .Config.Healthcheck}}' docker_mongo_3_4_7
{"Test":["/bin/sh","-c","docker-healthcheck"],"Interval":30000000000,"Timeout":30000000000,"Retries":3}

$ podman container inspect --format '{{json .State.Healthcheck}}' docker_mongo_3_4_7
{"Status":"healthy","FailingStreak":0,"Log":[{"Start":"2019-07-09T15:30:50.215217205+03:00","End":"2019-07-09T15:30:50.417395522+03:00","ExitCode":0,"Output":""},{"Start":"2019-07-09T15:31:21.21267606+03:00","End":"2019-07-09T15:31:21.408044864+03:00","ExitCode":0,"Output":""},{"Start":"2019-07-09T15:31:52.215381587+03:00","End":"2019-07-09T15:31:52.41479621+03:00","ExitCode":0,"Output":""},{"Start":"2019-07-09T15:32:23.23313914+03:00","End":"2019-07-09T15:32:23.456162557+03:00","ExitCode":0,"Output":""},{"Start":"2019-07-09T15:32:54.218175701+03:00","End":"2019-07-09T15:32:54.412113251+03:00","ExitCode":0,"Output":""}]}

I'm unsure: should I report this here or on the issue? Is there a comment command I have to write to "acknowledge" the fix?

[giuseppe]

@stefanb2 here it is enough. Thanks to have tried it out!

[stefanb2]

... and the service & timer units are removed after the container is stopped.

[rhatdan]

/lgtm
/hold

[mheon]

LGTM, nice work @giuseppe

[mheon]

/hold cancel