[201911][db_migrator] fix old 1911 feature config migration to a new …

…one.

This change is in addition to sonic-net#1522.
The init_cfg.json may have important fields added to configuration, while in
previous fix these entries will not be added when table already exists.
This change fixes this behaviour. Also, in order to preserve users auto_restart
configuration a special logic for migrating CONTAINER_FEATURE table has been implemented.

Signed-off-by: Stepan Blyschak <stepanb@nvidia.com>

scripts/db_migrator.py

@@ -154,6 +154,22 @@ def migrate_intf_table(self):
             self.appDB.set(self.appDB.APPL_DB, table, 'NULL', 'NULL')
             if_db.append(if_name)
 
+    def migrate_feature_table(self):
+        '''
+        Combine CONTAINER_FEATURE and FEATURE tables into FEATURE table.
+        '''
+
+        feature_table = self.configDB.get_table('FEATURE')
+        for feature, config in feature_table.items():
+            state = config.pop('status', 'disabled')
+            config['state'] = state
+            self.configDB.set_entry('FEATURE', feature, config)
+
+        container_feature_table = self.configDB.get_table('CONTAINER_FEATURE')
+        for feature, config in container_feature_table.items():
+            self.configDB.mod_entry('FEATURE', feature, config)
+            self.configDB.set_entry('CONTAINER_FEATURE', feature, None)
+
     def version_unknown(self):
         """
         version_unknown tracks all SONiC versions that doesn't have a version
@@ -207,6 +223,8 @@ def version_1_0_3(self):
         """
         log.log_info('Handling version_1_0_3')
 
+        self.migrate_feature_table()
+
         # Check ASIC type, if Mellanox platform then need DB migration
         if self.asic_type == "mellanox":
             if self.mellanox_buffer_migrator.mlnx_migrate_buffer_pool_size('version_1_0_3', 'version_1_0_4') and self.mellanox_buffer_migrator.mlnx_migrate_buffer_profile('version_1_0_3', 'version_1_0_4'):
@@ -246,15 +264,13 @@ def get_version(self):
 
         return 'version_unknown'
 
-
     def set_version(self, version=None):
         if not version:
             version = self.CURRENT_VERSION
         log.log_info('Setting version to ' + version)
         entry = { self.TABLE_FIELD : version }
         self.configDB.set_entry(self.TABLE_NAME, self.TABLE_KEY, entry)
 
-
     def common_migration_ops(self):
         try:
             with open(INIT_CFG_FILE) as f:
@@ -263,15 +279,16 @@ def common_migration_ops(self):
             raise Exception(str(e))
 
         for init_cfg_table, table_val in init_db.items():
-            data = self.configDB.get_table(init_cfg_table)
-            if data:
-                # Ignore overriding the values that pre-exist in configDB
-                continue
             log.log_info("Migrating table {} from INIT_CFG to config_db".format(init_cfg_table))
-            # Update all tables that do not exist in configDB but are present in INIT_CFG
-            for init_table_key, init_table_val in table_val.items():
-                self.configDB.set_entry(init_cfg_table, init_table_key, init_table_val)
-
+            for key in table_val:
+                curr_cfg = self.configDB.get_entry(init_cfg_table, key)
+                init_cfg = table_val[key]
+
+                # Override init config with current config.
+                # This will leave new fields from init_config
+                # in new_config, but not override existing configuration.
+                new_cfg = {**init_cfg, **curr_cfg}
+                self.configDB.set_entry(init_cfg_table, key, new_cfg)
 
     def migrate(self):
         version = self.get_version()