test/TEST-74-AUX-UTILS: fix racy check

We were getting a list of invocation IDs, picking one at random,
and then querying the unit. This is obviously racy.

TEST-74-AUX-UTILS.sh[2873]: + varlinkctl call /run/systemd/io.systemd.Manager io.systemd.Unit.List
                              '{"invocationID": "2052c9a5-7983-4f72-9910-c49e38c91dab"}'
TEST-74-AUX-UTILS.sh[3707]: Method call io.systemd.Unit.List() failed: io.systemd.Unit.NoSuchUnit

The complicated varlink + jq callout is replaced by a simple systemctl call.
I think that's better to avoid a complicated jq expression.

Fixes https://github.com/systemd/systemd/issues/38647.

diff --git a/test/units/TEST-74-AUX-UTILS.varlinkctl.sh b/test/units/TEST-74-AUX-UTILS.varlinkctl.sh
index 62c1f19c323d3c21cb758b368b261f25583f555b..3d23a53253514b239935fa9a33500e40fb14934a 100755 (executable)
--- a/test/units/TEST-74-AUX-UTILS.varlinkctl.sh
+++ b/test/units/TEST-74-AUX-UTILS.varlinkctl.sh
@@ -207,7 +207,7 @@ varlinkctl call /run/systemd/io.systemd.Manager io.systemd.Unit.List '{"name": "
 (! varlinkctl call /run/systemd/io.systemd.Manager io.systemd.Unit.List '{"name": "multi-user.target", "pid": {"pid": 1}}')
 
 varlinkctl call /run/systemd/io.systemd.Manager io.systemd.Unit.List '{"cgroup": "/init.scope"}'
-invocation_id=$(varlinkctl call --collect /run/systemd/io.systemd.Manager io.systemd.Unit.List '{}' | jq -r '.[] | .runtime.InvocationID' | grep -v null | tail -n 1)
+invocation_id="$(systemctl show -P InvocationID systemd-journald.service)"
 varlinkctl call /run/systemd/io.systemd.Manager io.systemd.Unit.List "{\"invocationID\": \"$invocation_id\"}"
 
 # test io.systemd.Manager in user manager