Add postgres init container

Add postgres init container if
postgres_init_container_extra_commands is defined

This allows users to run arbitrary commands

This is aimed to solve the issue where users may
need to chmod or chown the postgres
data volume for user 26, which is the user
that is running postgres in the sclorg image.

For example, one can now set the follow on the AWX spec:
spec:
  postgres_init_container_extra_commands: |
    chown 26:0 /var/lib/pgsql/data
    chmod 700 /var/lib/pgsql/data

Signed-off-by: Seth Foster <[email protected]>

config/crd/bases/awx.ansible.com_awxs.yaml

@@ -1811,6 +1811,9 @@ spec:
                 type: array
                 items:
                   type: string
+              postgres_init_container_extra_commands:
+                description: Extra commands for the init postgres container
+                type: string
               postgres_extra_volumes:
                 description: Specify extra volumes to add to the application pod
                 type: string

docs/user-guide/database-configuration.md

@@ -99,3 +99,15 @@ We recommend you use the default image sclorg image. If you are coming from a de
 You can no longer configure a custom `postgres_data_path` because it is hardcoded in the quay.io/sclorg/postgresql-15-c9s image.
 
 If you override the postgres image to use a custom postgres image like postgres:15 for example, the default data directory path may be different. These images cannot be used interchangeably.
+
+#### Postgres init extra commands
+
+Users can define arbitrary commands to run from a postgres init container.
+
+For example this may be useful for setting permissions and ownership of the postgres data directory.
+
+```yaml
+postgres_init_container_extra_commands: |
+  chown 26:0 /var/lib/pgsql/data
+  chmod 700 /var/lib/pgsql/data
+```

roles/installer/templates/statefulsets/postgres.yaml.j2

@@ -46,6 +46,26 @@ spec:
 {% endif %}
 {% if postgres_priority_class is defined %}
       priorityClassName: '{{ postgres_priority_class }}'
+{% endif %}
+{% if postgres_init_container_extra_commands is defined %}
+      initContainers:
+        - name: init
+          image: '{{ _postgres_image }}'
+          imagePullPolicy: '{{ image_pull_policy }}'
+          securityContext:
+            runAsUser: 0
+          command:
+            - /bin/sh
+            - -c
+            - |
+              {{ postgres_init_container_extra_commands | indent(width=14) }}
+          volumeMounts:
+            - name: postgres-{{ supported_pg_version }}
+              mountPath: '{{ _postgres_data_path | dirname }}'
+              subPath: '{{ _postgres_data_path | dirname | basename }}'
+{% if postgres_extra_volume_mounts %}
+            {{ postgres_extra_volume_mounts | indent(width=12, first=True) }}
+{% endif %}
 {% endif %}
       containers:
         - image: '{{ _postgres_image }}'
@@ -113,7 +133,7 @@ spec:
             - name: postgres-{{ supported_pg_version }}
               mountPath: '{{ _postgres_data_path | dirname }}'
               subPath: '{{ _postgres_data_path | dirname | basename }}'
-{% if postgres_extra_volume_mounts -%}
+{% if postgres_extra_volume_mounts %}
             {{ postgres_extra_volume_mounts | indent(width=12, first=True) }}
 {% endif %}
           resources: {{ postgres_resource_requirements }}