custom show command for mysql and schema description

borgmatic/config/schema.yaml

@@ -1092,15 +1092,15 @@ properties:
                     description: |
                         Command to use instead of "mysqldump". This can be used
                         to run a specific mysql_dump version (e.g., one inside 
-                        a running docker container). Defaults to "mysqldump".
+                        a running container). Defaults to "mysqldump".
                     example: docker exec mysql_container mysqldump
                 mysql_command:
                     type: string
                     description: |
                         Command to run instead of "mysql". This
                         can be used to run a specific mysql
-                        version (e.g., one inside a running docker
-                        container). Defaults to "mysql".
+                        version (e.g., one inside a running container). 
+                        Defaults to "mysql".
                     example: docker exec mysql_container mysql
                 format:
                     type: string

borgmatic/hooks/mysql.py

@@ -35,8 +35,9 @@ def database_names_to_dump(database, extra_environment, log_prefix, dry_run):
     if dry_run:
         return ()
 
+    mysql_show_command = database.get('mysql_command') or 'mysql'
     show_command = (
-        ('mysql',)
+        (mysql_show_command,)
         + (tuple(database['list_options'].split(' ')) if 'list_options' in database else ())
         + (('--host', database['hostname']) if 'hostname' in database else ())
         + (('--port', str(database['port'])) if 'port' in database else ())

tests/unit/hooks/test_mysql.py

@@ -142,6 +142,27 @@ def test_database_names_to_dump_runs_mysql_with_list_options():
     assert module.database_names_to_dump(database, None, 'test.yaml', '') == ('foo', 'bar')
 
 
+def test_database_names_to_dump_runs_non_default_mysql_with_list_options():
+    database = {
+        'name': 'all',
+        'list_options': '--defaults-extra-file=my.cnf',
+        'mysql_command': 'custom_mysql',
+    }
+    flexmock(module).should_receive('execute_command_and_capture_output').with_args(
+        extra_environment=None,
+        full_command=(
+            'custom_mysql',  # Custom MySQL command
+            '--defaults-extra-file=my.cnf',
+            '--skip-column-names',
+            '--batch',
+            '--execute',
+            'show schemas',
+        )
+    ).and_return(('foo\nbar')).once()
+
+    assert module.database_names_to_dump(database, None, 'test.yaml', '') == ('foo', 'bar')
+
+
 def test_execute_dump_command_runs_mysqldump():
     process = flexmock()
     flexmock(module.dump).should_receive('make_data_source_dump_filename').and_return('dump')