test: correct TEST-41 StartLimitBurst test

TEST-41 verifies that the StartLimitBurst property will correctly
limit the number of unit restarts, but the test currently doesn't
adjust the StartLimitIntervalSec which defaults to 10 seconds.

On Ubuntu CI, running under un-accelerated qemu, it can take more than
10 seconds to perform all 3 restarts, which avoids the burst limit,
and fails the test.

Instead, specify a long StartLimitIntervalSec in the test, so we can
be sure to correctly test StartLimitBurst even on slow testbeds.

Fixes #13794.

2 files changed, 21 insertions, 9 deletions

diff --git a/test/TEST-41-ONESHOT-RESTART/blacklist-ubuntu-ci b/test/TEST-41-ONESHOT-RESTART/blacklist-ubuntu-ci
deleted file mode 100644
index 22b34bbb0c..0000000000
--- a/test/TEST-41-ONESHOT-RESTART/blacklist-ubuntu-ci
+++ /dev/null
@@ -1,4 +0,0 @@
-This appears to be failing on Ubuntu CI due to short sleep duration
-waiting for the service-restarts to complete, but doubling the
-sleep from 5 to 10 seconds didn't appear to help, so let's blacklist
-this on Ubuntu CI while debugging the test failure.
diff --git a/test/TEST-41-ONESHOT-RESTART/testsuite.sh b/test/TEST-41-ONESHOT-RESTART/testsuite.sh
index f7423dbf9a..4465614ff3 100755
--- a/test/TEST-41-ONESHOT-RESTART/testsuite.sh
+++ b/test/TEST-41-ONESHOT-RESTART/testsuite.sh
@@ -2,14 +2,19 @@
 set -ex
 set -o pipefail
 
+# wait this many secs for each test service to succeed in what is being tested
+MAX_SECS=60
+
 systemd-analyze log-level debug
 systemd-analyze log-target console
 
-# These three commands should succeed.
+# test one: Restart=on-failure should restart the service
 ! systemd-run --unit=one -p Type=oneshot -p Restart=on-failure /bin/bash -c "exit 1"
 
-sleep 5
-
+for ((secs=0; secs<$MAX_SECS; secs++)); do
+  [[ "$(systemctl show one.service -p NRestarts --value)" -le 0 ]] || break
+  sleep 1
+done
 if [[ "$(systemctl show one.service -p NRestarts --value)" -le 0 ]]; then
   exit 1
 fi
@@ -18,10 +23,21 @@ TMP_FILE="/test-41-oneshot-restart-test"
 
 touch $TMP_FILE
 
-! systemd-run --unit=two -p StartLimitBurst=3 -p Type=oneshot -p Restart=on-failure -p ExecStart="/bin/bash -c \"printf a >>  $TMP_FILE\"" /bin/bash -c "exit 1"
+# test two: make sure StartLimitBurst correctly limits the number of restarts
+# and restarts execution of the unit from the first ExecStart=
+! systemd-run --unit=two -p StartLimitIntervalSec=120 -p StartLimitBurst=3 -p Type=oneshot -p Restart=on-failure -p ExecStart="/bin/bash -c \"printf a >>  $TMP_FILE\"" /bin/bash -c "exit 1"
 
-sleep 5
+# wait for at least 3 restarts
+for ((secs=0; secs<$MAX_SECS; secs++)); do
+  [[ $(cat $TMP_FILE) != "aaa" ]] || break
+  sleep 1
+done
+if [[ $(cat $TMP_FILE) != "aaa" ]]; then
+  exit 1
+fi
 
+# wait for 5 more seconds to make sure there aren't excess restarts
+sleep 5
 if [[ $(cat $TMP_FILE) != "aaa" ]]; then
   exit 1
 fi