Use `bake_image` Pillar setting to control PG startup behavior

pillar.example

@@ -19,7 +19,7 @@ postgres:
   postgresconf: |
     listen_addresses = '*'  # listen on all interfaces
 
-  # Backup extension for postgresql.conf file, defaults to `.bak`.
+  # Backup extension for postgresql.conf file, defaults to ``.bak``.
   # Set to False to stop creation of backup on postgresql.conf changes.
   {%- if 'status.time' in salt.keys() %}
   postgresconf_backup: ".backup@{{ salt['status.time']('%y-%m-%d_%H:%M:%S') }}"
@@ -28,7 +28,7 @@ postgres:
   # Path to the `pg_hba.conf` file Jinja template on Salt Fileserver
   pg_hba.conf: salt://postgres/templates/pg_hba.conf.j2
 
-  # This section covers ACL management in the `pg_hba.conf` file.
+  # This section covers ACL management in the ``pg_hba.conf`` file.
   # acls list controls: which hosts are allowed to connect, how clients
   # are authenticated, which PostgreSQL user names they can use, which
   # databases they can access. Records take one of these forms:
@@ -48,9 +48,20 @@ postgres:
   # PostgreSQL service name
   service: postgresql
 
+  {%- if grains['init'] == 'unknown' %}
+
+  # If Salt is unable to detect init system running in the scope of state run,
+  # probably we are trying to bake a container/VM image with PostgreSQL.
+  # Use ``service`` setting to contol how PostgreSQL will be started: if set to
+  # ``True`` the raw ``pg_ctl`` will be utilized instead of packaged init
+  # script, job or unit run with Salt ``service`` state.
+  bake_image: True
+
+  {%- endif %}
+
   # Create/remove users, tablespaces, databases, schema and extensions.
   # Each of these dictionaries contains PostgreSQL entities which
-  # mapped to the `postgres_*` Salt states with arguments. See the Salt
+  # mapped to the ``postgres_*`` Salt states with arguments. See the Salt
   # documentaion to get all supported argument for a particular state.
   #
   # Format is the following:

postgres/defaults.yaml

@@ -33,6 +33,8 @@ postgres:
 
   service: postgresql
 
+  bake_image: False
+
   users: {}
   tablespaces: {}
   databases: {}

postgres/server.sls

@@ -108,7 +108,9 @@ postgresql-tablespace-dir-{{ name }}:
 
 {%- endfor %}
 
-{%- if grains['init'] != 'unknown' %}
+{%- if not postgres.bake_image %}
+
+# Start PostgreSQL server using OS init
 
 postgresql-running:
   service.running:
@@ -120,8 +122,7 @@ postgresql-running:
 
 {%- else %}
 
-# An attempt to launch PostgreSQL with `pg_ctl` if Salt was unable to
-# detect local init system (`service` module would fail in this case)
+# An attempt to launch PostgreSQL with `pg_ctl` during an image preparation
 
 postgresql-start:
   cmd.run:
@@ -129,10 +130,10 @@ postgresql-start:
     - runas: {{ postgres.user }}
     - unless:
       - ps -p $(head -n 1 {{ postgres.conf_dir }}/postmaster.pid) 2>/dev/null
+    - require:
+      - file: postgresql-pg_hba
 
-# Try to enable PostgreSQL in "manual" way if Salt `service` state module
-# is currently not available (e.g. during Docker or Packer build when is no init
-# system running)
+# Try to enable PostgreSQL in "manual" way when baking an image
 
 postgresql-enable:
   cmd.run:
@@ -146,7 +147,7 @@ postgresql-enable:
     # Nothing to do
     - name: 'true'
   {%- endif %}
-    - onchanges:
+    - require:
       - cmd: postgresql-start
 
 {%- endif %}