ci: add support for VM_DRIVER=podman to scripts/minikube.sh

When running on AWE EC2 virtual-machines, we'll use Podman instead of
installing a VM. The "none" driver might work as well, but it requires
additional dependencies to be installed, which may change over time with
new minikube or Kubernetes releases. Hopefully the Podman driver is less
affected with changes in dependencies.

Depends-on: #3419
Closes: #3415
Signed-off-by: Niels de Vos <ndevos@redhat.com>

scripts/minikube.sh

@@ -22,7 +22,7 @@ function copy_image_to_cluster() {
     if [ -z "$(${CONTAINER_CMD} images -q "${build_image}")" ]; then
         ${CONTAINER_CMD} pull "${build_image}"
     fi
-    if [[ "${VM_DRIVER}" == "none" ]]; then
+    if [[ "${VM_DRIVER}" == "none" ]] || [[ "${VM_DRIVER}" == "podman" ]]; then
         ${CONTAINER_CMD} tag "${build_image}" "${final_image}"
         return
     fi
@@ -139,6 +139,34 @@ function validate_sidecar() {
 done
 }
 
+# install_podman_wrapper creates /usr/bin/podman.wrapper which adds /sys
+# filesystem mount points when a privileged container is started. This makes it
+# possible to map RBD devices in the container that minikube creates when
+# VM_DRIVER=podman is used.
+function install_podman_wrapper() {
+    if [[ -e /usr/bin/podman.wrapper ]]
+    then
+        return
+    fi
+
+    echo '#!/bin/sh
+if [[ "${1}" = run ]]
+then
+    if (echo "${@}" | grep -q privileged)
+    then
+        shift
+        exec /usr/bin/podman.real run -v /sys:/sys:rw -v /dev:/dev:rw --systemd=true "${@}"
+    fi
+fi
+
+exec /usr/bin/podman.real "${@}"
+' > /usr/bin/podman.wrapper
+    chmod +x /usr/bin/podman.wrapper
+
+    mv /usr/bin/podman /usr/bin/podman.real
+    ln -s podman.wrapper /usr/bin/podman
+}
+
 # Storage providers and the default storage class is not needed for Ceph-CSI
 # testing. In order to reduce resources and potential conflicts between storage
 # plugins, disable them.
@@ -185,7 +213,7 @@ K8S_FEATURE_GATES=${K8S_FEATURE_GATES:-""}
 # kubelet.resolv-conf needs to point to a file, not a symlink
 # the default minikube VM has /etc/resolv.conf -> /run/systemd/resolve/resolv.conf
 RESOLV_CONF='/run/systemd/resolve/resolv.conf'
-if [[ "${VM_DRIVER}" == "none" ]] && [[ ! -e "${RESOLV_CONF}" ]]; then
+if { [[ "${VM_DRIVER}" == "none" ]] || [[ "${VM_DRIVER}" == "podman" ]]; } && [[ ! -e "${RESOLV_CONF}" ]]; then
 	# in case /run/systemd/resolve/resolv.conf does not exist, use the
 	# standard /etc/resolv.conf (with symlink resolved)
 	RESOLV_CONF="$(readlink -f /etc/resolv.conf)"
@@ -216,6 +244,8 @@ up)
     if [[ "${VM_DRIVER}" == "none" ]]; then
         mkdir -p "$HOME"/.kube "$HOME"/.minikube
         install_kubectl
+    elif [[ "${VM_DRIVER}" == "podman" ]]; then
+        install_podman_wrapper
     fi
 
     disable_storage_addons
@@ -234,11 +264,14 @@ up)
 
     # create a link so the default dataDirHostPath will work for this
     # environment
-    if [[ "${VM_DRIVER}" != "none" ]]; then
+    if [[ "${VM_DRIVER}" != "none" ]] && [[ "${VM_DRIVER}" != "podman" ]]; then
         wait_for_ssh
         # shellcheck disable=SC2086
         ${minikube} ssh "sudo mkdir -p /mnt/${DISK}/var/lib/rook;sudo ln -s /mnt/${DISK}/var/lib/rook /var/lib/rook"
     fi
+    if [[ "${VM_DRIVER}" = "podman" ]]; then
+        ${minikube} ssh "sudo mount -oremount,rw /sys"
+    fi
     ${minikube} kubectl -- cluster-info
     ;;
 down)