stack.erp5: Randomly generate server-id if not provided.

Makes it easier to deploy a functional replication setup.

stack/erp5/buildout.hash.cfg

@@ -19,7 +19,7 @@ md5sum = 1e89de954d816b93f76d9b75820d192c
 
 [template-mariadb]
 filename = instance-mariadb.cfg.in
-md5sum = 11e7faca5233868c1643854e4c898588
+md5sum = 6cc8f361b3ca22aab2611231fcad8b2d
 
 [template-kumofs]
 filename = instance-kumofs.cfg.in

stack/erp5/instance-mariadb.cfg.in

@@ -19,6 +19,7 @@
 
 [publish]
 recipe = slapos.cookbook:publish.serialised
+-extends = publish-early
 {% macro render_database_list(database_list) -%}
 {% set publish_database_list = [] -%}
 {% for database in database_list -%}
@@ -33,6 +34,20 @@ recipe = slapos.cookbook:publish.serialised
 database-list = {{ render_database_list(database_list) }}
 test-database-list = {{ render_database_list(test_database_list) }}
 
+[publish-early]
+recipe = slapos.cookbook:publish-early
+-init =
+  server-id gen-server-id:value
+{%- set server_id = slapparameter_dict.get('server-id') %}
+{%- if server_id %}
+server-id = {{ dumps(server_id) }}
+{%- endif %}
+
+[gen-server-id]
+recipe = slapos.cookbook:random.integer
+minimum = {{ dumps(1) }}
+maximum = {{ dumps(2**32 - 1) }}
+
 [jinja2-template-base]
 recipe = slapos.recipe.template:jinja2
 mode = 644
@@ -124,7 +139,7 @@ relaxed-writes = {{ dumps(slapparameter_dict.get('relaxed-writes', False)) }}
 binlog-path = ${directory:mariadb-backup-incremental}/binlog
 # XXX: binlog rotation happens along with other log's rotation
 binlog-expire-days = {{ dumps(incremental_backup_retention_days) }}
-server-id = {{ dumps(slapparameter_dict.get('server-id', 1)) }}
+server-id = ${publish-early:server-id}
 {% else %}
 binlog-path =
 {%- endif %}