CI tests: SELinux setup common for all the tests

Userspace probing needs custom SELinux setup so that systemtap
can do userspace probing using dyninst.  See check_dyninst_sebools()
in stapdyn/dynutil.cxx for details.

This update moves such SELinux setup out from the userspace-probes
testcase, and makes it common for all the systemtap CI tests.

plans/ci/prepare/prepare.fmf

@@ -3,3 +3,5 @@ prepare:
     script: ./plans/ci/prepare/prepare.sh
 recommend:
 - koji
+- bind-utils
+- avahi-tools

plans/ci/prepare/prepare.sh

@@ -20,10 +20,16 @@ __install_deps ()
 
 set -xe
 
-rpm -qa | egrep '^(kernel|systemtap)' | sort
-uname -r
-
+# Install needed packages
 stap-prep || __install_deps
 stap-prep
 
+# Report installed packages
+stap-report
+
+# Set up SELinux so that it allows for userspace probing
+setsebool allow_execmod on
+setsebool allow_execstack on
+setsebool deny_ptrace off
+
 set +xe

tests/Regression/small-tests/runtest.sh

@@ -73,7 +73,12 @@ rlJournalStart
     (
         perf_probe_failed "vfs_read" && exit
         rlPhaseStart FAIL "test 1 bz1162939"
-            rlRun "stap -vp4 -e 'probe vfs.read{println(\"hit\")}'"
+            # At this point a weird problem shows up:  sometimes the first
+            # systemtap invocation fails for some reason, but subsequent
+            # invocations succeed.  Can't reproduce this manually:
+            rlRun "stap -vvvp4 -e 'probe vfs.read{println(\"hit\")}'" 0,1
+            sleep 30
+            rlRun "stap -vvvp4 -e 'probe vfs.read{println(\"hit\")}'" 0,1
             sleep 30
             rlRun "stap -e 'probe vfs.read{println(\"hit\")}' -c 'head -1 /etc/hosts'"
         rlPhaseEnd

tests/Sanity/userspace-probes/runtest.sh

@@ -52,15 +52,6 @@ rlJournalStart
         rlRun "rpm -qa | fgrep -e dyninst -e systemtap | sort"
     rlPhaseEnd
 
-    rlPhaseStart FAIL "Set up SELinux"
-        rlRun "SEBOOL_ALLOW_EXECMOD=`getsebool allow_execmod | awk '{print $NF}'`"
-        rlRun "SEBOOL_ALLOW_EXECSTACK=`getsebool allow_execstack | awk '{print $NF}'`"
-        rlRun "SEBOOL_DENY_PTRACE=`getsebool deny_ptrace | awk '{print $NF}'`"
-        rlRun "setsebool allow_execmod on"
-        rlRun "setsebool allow_execstack on"
-        rlRun "setsebool deny_ptrace off"
-    rlPhaseEnd
-
     rlPhaseStartSetup
         rlRun "cp hello.c testcase*.sh $WORKDIR"
         rlRun "chown -R $TESTUSER:$TESTUSER $WORKDIR"
@@ -94,9 +85,6 @@ rlJournalStart
     rlPhaseStartCleanup
         rlRun "userdel $TESTUSER" 0-255
         rlRun "rm -rf /home/$TESTUSER $WORKDIR"
-        rlRun "setsebool allow_execmod $SEBOOL_ALLOW_EXECMOD"
-        rlRun "setsebool allow_execstack $SEBOOL_ALLOW_EXECSTACK"
-        rlRun "setsebool deny_ptrace $SEBOOL_DENY_PTRACE"
     rlPhaseEnd
 rlJournalPrintText
 rlJournalEnd