Fix rpm install script

It needs to use galera from BB artifacts and should not depend on
fetching rpms. Also use either yum or dnf but do not default to yum.

scripts/bash_lib.sh

@@ -135,17 +135,26 @@ apt_get_update() {
   fi
 }
 
-yum_makecache() {
+rpm_pkg() {
+  if command -v dnf >/dev/null; then
+    echo dnf
+  elif command -v yum >/dev/null; then
+    echo yum
+  fi
+}
+
+rpm_pkg_makecache() {
+  pkg_cmd=$(rpm_pkg)
   # Try several times, to avoid sporadic "The requested URL returned error: 404"
   made_cache=0
   for i in {1..5}; do
-    sudo rm -rf /var/cache/yum/*
-    sudo yum clean all
+    sudo rm -rf "/var/cache/$pkg_cmd/*"
+    sudo "$pkg_cmd" clean all
     source /etc/os-release
     if [[ $ID == "rhel" ]]; then
       sudo subscription-manager refresh
     fi
-    if sudo yum makecache; then
+    if sudo "$pkg_cmd" makecache; then
       made_cache=1
       break
     else
@@ -277,8 +286,8 @@ rpm_setup_bb_galera_artifacts_mirror() {
   # stop if any variable is undefined
   set -u
   bb_log_info "setup buildbot galera artifact repository"
-  sudo wget "$artifactsURL/galera/mariadb-4.x-latest-gal-${parentbuildername/-rpm-autobake}.repo" -O /etc/yum.repos.d/galera.repo || {
-    bb_log_err "unable to download $artifactsURL/galera/mariadb-4.x-latest-gal-${parentbuildername/-rpm-autobake}.repo"
+  sudo wget "$artifactsURL/galera/mariadb-4.x-latest-gal-${parentbuildername/-rpm-autobake/}.repo" -O /etc/yum.repos.d/galera.repo || {
+    bb_log_err "unable to download $artifactsURL/galera/mariadb-4.x-latest-gal-${parentbuildername/-rpm-autobake/}.repo"
     exit 1
   }
   set +u

scripts/rpm-install.sh

@@ -11,6 +11,9 @@ set -e
 # shellcheck disable=SC1091
 . ./bash_lib.sh
 
+# yum/dnf switch
+pkg_cmd=$(rpm_pkg)
+
 # function to be able to run the script manually (see bash_lib.sh)
 manual_run_switch "$1"
 
@@ -26,19 +29,19 @@ bb_print_env
 
 set -x
 
-yum_makecache
+rpm_pkg_makecache
 
-sudo yum search mysql | { grep "^mysql" || true; }
-sudo yum search maria | { grep "^maria" || true; }
-sudo yum search percona | { grep percona || true; }
+sudo "$pkg_cmd" search mysql | { grep "^mysql" || true; }
+sudo "$pkg_cmd" search maria | { grep "^maria" || true; }
+sudo "$pkg_cmd" search percona | { grep percona || true; }
 
 # setup repository for galera dependency
 rpm_setup_bb_galera_artifacts_mirror
 
 # setup artifact repository
 rpm_setup_bb_artifacts_mirror
 
-yum_makecache
+rpm_pkg_makecache
 
 if [[ -f /etc/yum.repos.d/MariaDB.repo ]]; then
   repo_name_tmp=$(head -n1 /etc/yum.repos.d/MariaDB.repo)
@@ -48,11 +51,13 @@ if [[ -f /etc/yum.repos.d/MariaDB.repo ]]; then
 else
   bb_log_err "/etc/yum.repos.d/MariaDB.repo is missing"
 fi
-repoquery --disablerepo=* --enablerepo="${repo_name}" | xargs sudo yum -y install
 
-# here is to keep track of it how to install everything from a MDBF repo (they
-# contain 3 versions).
-# repoquery --disablerepo=* --enablerepo=mariadb -a | cut -d ":" -f1 | sort -u | sed 's/-0//' | xargs dnf -y install
+# Install all produced packages. Note that the upgrade test comes with various
+# mode (server/all/deps/columnstore), we might want to add those modes in the
+# future.
+repoquery --disablerepo=* --enablerepo="${repo_name}" -a |
+  cut -d ":" -f1 | sort -u | sed 's/-0//' |
+  xargs sudo "$pkg_cmd" -y install
 
 sh -c 'g=/usr/lib*/galera*/libgalera_smm.so; echo -e "[galera]\nwsrep_provider=$g"' | sudo tee /etc/my.cnf.d/galera.cnf
 case "$systemdCapability" in