ci: add support for running on rhel

This is so we have one script for Fedora/RHEL. It can also handle
bolt < 0.6 now, after which the test-integration list-test output
changed.

tests/run-it.sh

@@ -1,13 +1,44 @@
 #!/usr/bin/bash
 set -u
 
-IT="$1"
+# helper functions
+vcmp_lt () {
+    # argument $1 is less than $2
+    MV=$(echo "$@" | tr " " "\n" | sort -rV | head -n1)
+    test "$1" != "$MV"
+}
+
+# main script
+IT="${1:-source/tests/test-integration}"
+
+# check if we need to install additional packages
+# which is the case if we are on RHEL 8
+source /etc/os-release || exit 1
+
+if [[ "$ID" = *"rhel"* ]] && [[ "$VERSION_ID" == *"8"* ]]; then
+    dnf config-manager -y --add-repo umockdev.repo
+    dnf install -y umockdev-devel python3-gobject-base
+    pip3 install python-dbusmock
+fi
+
+BOLT_VERSION=$(boltctl --version | cut -d " " -f2)
+
+# check if we can even discover the tests
+"$IT" list-tests > /dev/null || exit 1
+
+# The format of "list-tests" changed with 0.6
+if vcmp_lt $BOLT_VERSION 0.6; then
+    echo "Old style integration test names"
+    DELIM=" "
+else
+    DELIM=$'\n'
+fi
 
 # discover all the tests
-TESTS=()
+declare -a TESTS=()
-while IFS= read -r line; do
+while IFS= read -r -d "$DELIM" line; do
     TESTS+=( "${line% *}" )
-done < <( "$1" list-tests )
+done < <( $IT list-tests )
 
 # execute all the tests, one by one
 RESULT=0