[libvirt] Add support for configuring hook scripts

Allow configuring hook scripts for libvirt, that are called by the
daemon on various events.

https: //www.libvirt.org/hooks.html

Change-Id: I7cf06741dfdc8e9b97179d45975bd97b460855a9
Signed-off-by: Mosher, Jaymes (jm616v) <jm616v@att.com>

libvirt/templates/configmap-bin.yaml

@@ -40,6 +40,12 @@ data:
 {{- end }}
 {{- include "helm-toolkit.snippets.values_template_renderer" (dict "envAll" $envAll "template" .Values.conf.init_modules.script "key" "libvirt-init-modules.sh") | indent 2 }}
 {{- include "helm-toolkit.snippets.values_template_renderer" (dict "envAll" $envAll "template" .Values.conf.dynamic_options.script "key" "init-dynamic-options.sh") | indent 2 }}
+{{- if .Values.conf.hooks.enabled }}
+{{- range $k, $v := .Values.conf.hooks.scripts }}
+  {{ $k }}: |
+{{ tpl $v . | indent 4 }}
+{{- end }}
+{{- end }}
 {{- end }}
 {{- end }}
 {{- if .Values.manifests.configmap_bin }}

libvirt/templates/daemonset-libvirt.yaml

@@ -301,6 +301,14 @@ spec:
               subPath: key
               readOnly: true
             {{- end }}
+            {{- if .Values.conf.hooks.enabled }}
+            {{- range $k, $v := .Values.conf.hooks.scripts }}
+            - name: libvirt-bin
+              mountPath: /etc/libvirt/hooks/{{ $k }}
+              subPath: {{ $k }}
+              readOnly: true
+            {{- end }}
+            {{- end }}
 {{ if $mounts_libvirt.volumeMounts }}{{ toYaml $mounts_libvirt.volumeMounts | indent 12 }}{{ end }}
         {{- if .Values.pod.sidecars.libvirt_exporter.enabled }}
         - name: libvirt-exporter

libvirt/values.yaml

@@ -246,6 +246,17 @@ conf:
       kubectl -n ${POD_NAMESPACE} get secret ${POD_NAME}-${TYPE} -o jsonpath='{.data.tls\.crt}' | base64 -d > /tmp/${TYPE}.crt
       kubectl -n ${POD_NAMESPACE} get secret ${POD_NAME}-${TYPE} -o jsonpath='{.data.tls\.key}' | base64 -d > /tmp/${TYPE}.key
       kubectl -n ${POD_NAMESPACE} get secret ${POD_NAME}-${TYPE} -o jsonpath='{.data.ca\.crt}' | base64 -d > /tmp/${TYPE}-ca.crt
+  hooks:
+    # Libvirt hook scripts, that are placed in /etc/libvirt/hooks
+    enabled: false
+    scripts:
+      # daemon:
+      # qemu:
+      # lxc:
+      # libxl:
+      # bhyve:
+      # network:
+
 pod:
   probes:
     libvirt:

releasenotes/notes/libvirt-5bf3185fc00a9938.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Added ability to configure libvirt hooks.
+...