amend linux cleanup script with full minikube, docker and kvm cleanup

hack/jenkins/cron/cleanup_and_reboot_Linux.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright 2019 The Kubernetes Authors All rights reserved.
+# Copyright 2020 The Kubernetes Authors All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -36,11 +36,83 @@ logger "cleanup_and_reboot is happening!"
 # kill jenkins to avoid an incoming request
 killall java
 
+# clean minikube left overs
+echo -e "\ncleanup minikube..."
+for user in "jenkins" "root"; do
+	minikube="$(sudo su - ${user} -c 'command -v minikube')"
+	if [ ! -x "${minikube}" ]; then
+		minikube="/tmp/minikube"
+		curl -sfL https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64 -o "${minikube}" && chmod +x "${minikube}" || true
+	fi
+	if [ -x "${minikube}" ]; then
+		if sudo su - "${user}" -c "${minikube} delete --all --purge" >/dev/null 2>&1; then
+			echo "successfully cleaned up minikube for ${user} user using ${minikube}"
+		fi
+	fi
+	sudo killall --user "${user}" minikube >/dev/null 2>&1 || true
+done
+
 # clean docker left overs
-docker rm -f -v $(docker ps -aq) >/dev/null 2>&1 || true
-docker volume prune -f || true
-docker volume ls || true
-docker system df || true
+echo -e "\ncleanup docker..."
+docker kill $(docker ps -aq) >/dev/null 2>&1 || true
+docker system prune --volumes --force || true
+
+# clean KVM left overs
+echo -e "\ncleanup kvm..."
+overview() {
+	echo -e "\n - KVM domains:"
+	sudo virsh list --all || true
+	echo " - KVM pools:"
+	sudo virsh pool-list --all || true
+	echo " - KVM networks:"
+	sudo virsh net-list --all || true
+	echo " - host networks:"
+	sudo ip link show || true
+}
+echo -e "\nbefore the cleanup:"
+overview
+for DOM in $( sudo virsh list --all --name ); do
+	if sudo virsh destroy "${DOM}"; then
+		if sudo virsh undefine "${DOM}"; then
+			echo "successfully deleted KVM domain:" "${DOM}"
+			continue
+		fi
+		echo "unable to delete KVM domain:" "${DOM}"
+	fi
+done
+#for POOL in $( sudo virsh pool-list --all --name ); do  # better, but flag '--name' is not supported for 'virsh pool-list' command on older libvirt versions
+for POOL in $( sudo virsh pool-list --all | awk 'NR>2 {print $1}' ); do
+	for VOL in $( sudo virsh vol-list "${POOL}" ); do
+		if sudo virsh vol-delete --pool "${POOL}" "${VOLUME}"; then  # flag '--delete-snapshots': "delete snapshots associated with volume (must be supported by storage driver)"
+			echo "successfully deleted KVM pool/volume:" "${POOL}"/"${VOL}"
+			continue
+		fi
+		echo "unable to delete KVM pool/volume:" "${POOL}"/"${VOL}"
+	done
+done
+for NET in $( sudo virsh net-list --all --name ); do
+	if [ "${NET}" != "default" ]; then
+		if sudo virsh net-destroy "${NET}"; then
+			if sudo virsh net-undefine "${NET}"; then
+				echo "successfully deleted KVM network" "${NET}"
+				continue
+			fi
+		fi
+		echo "unable to delete KVM network" "${NET}"
+	fi
+done
+# DEFAULT_BRIDGE is a bridge connected to the 'default' KVM network
+DEFAULT_BRIDGE=$( sudo virsh net-info default | awk '{ if ($1 == "Bridge:") print $2 }' )
+echo "bridge connected to the 'default' KVM network to leave alone:" "${DEFAULT_BRIDGE}"
+for VIF in $( sudo ip link show | awk -v defvbr="${DEFAULT_BRIDGE}.*" -F': ' '$2 !~ defvbr { if ($2 ~ /virbr.*/ || $2 ~ /vnet.*/) print $2 }' ); do
+	if sudo ip link delete "${VIF}"; then
+		echo "successfully deleted KVM interface" "${VIF}"
+		continue
+	fi
+	echo "unable to delete KVM interface" "${VIF}"
+done
+echo -e "\nafter the cleanup:"
+overview
 
 # Linux-specific cleanup
 
@@ -51,4 +123,4 @@ systemctl list-unit-files --state=enabled \
         | xargs systemctl disable
 
 # update and reboot
-apt update -y && apt upgrade -y && reboot
+apt update -y && apt upgrade -y && apt-get autoclean && reboot