Update system during systemtap probe test

Otherwise CI might be running old kernel which
no longer exists in repositories making the stap-prep fail on missing
debuginfo/devel packages.

systemtap-static-probes-in-ruby/main.fmf

@@ -8,6 +8,8 @@ adjust:
 summary: It tests there are static probes in ruby package.
 description: |
     Simple test to exercise ruby's systemtap API.
+    Test updates the system under test unless ``UPDATE_SUT``
+    environment variable is set to any other value than ``1``.
 component:
 - systemtap
 - ruby
@@ -15,4 +17,4 @@ require:
 - systemtap
 - ruby-doc
 - ruby
-duration: 30m
+duration: 50m

systemtap-static-probes-in-ruby/runtest.sh

@@ -39,12 +39,27 @@ _STAP_OUT="stap-out.log"
 RUBY_OPTS="--disable-gems"
 STAP_OPTS="--suppress-handler-errors"
 
+# System Under Test
+UPDATE_SUT="${UPDATE_SUT:-1}"
+
 rlJournalStart
     rlPhaseStartSetup
         rlAssertRpm --all
         rlAssertBinaryOrigin $RUBY
         rlAssertExists "${_STAP_FILE}" || rlDie
         rlLog "Using STAP_FILE from $(rpm -qf ${_STAP_FILE})."
+        if [[ $UPDATE_SUT == "1" ]]; then
+            rlLog "Machine to be updated, disable by setting UPDATE_SUT to other value than 1"
+            if [[ $TMT_REBOOT_COUNT == "0" ]]; then
+                rlRun "dnf update --refresh -y"
+                rlLog "Now reboot the system"
+                tmt-reboot
+            else
+                rlLog "SUT updated and rebooted"
+            fi
+        else
+            rlLog "Machine not to be updated"
+        fi
         rlRun "stap-prep" 0 "Prepare system for systemtap use"
         rlRun "TmpDir=\`mktemp -d\`" 0 "Creating tmp directory"
         rlRun "pushd ${TmpDir}"