[d] Fix bug on restart

dodo.py

@@ -1,5 +1,6 @@
 import subprocess
 import os
+import sys
 
 from doit.tools import LongRunning
 
@@ -8,7 +9,7 @@ from dodo_utils import wait_net_service, wait_pgsql_db, \
         run_task_func, scan_dir
 
 COMPOSE = 'docker-compose -p feedati'
-DOIT_CONFIG = {'default_tasks': ['up']}
+DOIT_CONFIG = {'default_tasks': ['up'], 'backend': 'sqlite3'}
 
 
 def task_build():
@@ -104,6 +105,40 @@ def task_up():
     }
 
 
+def _get_valid_services():
+    srv = subprocess.check_output((COMPOSE + ' config --services').split())
+    return srv.decode('utf-8').strip().split()
+
+
+def restart(services):
+    '''This actually restart the container(s).'''
+    valid = _get_valid_services()
+    err = False
+    for service in services:
+        if service not in valid:
+            print('ERROR: invalid service %s' % service, file=sys.stderr)
+            err = True
+    if err or not services:
+        print('Valid services are: ' + ', '.join(valid), file=sys.stderr)
+        return False
+    for service in services:
+        subprocess.check_call((COMPOSE + ' restart %s' % service).split())
+    return True
+
+
+def task_restart():
+    '''Restarts a container specified via commandline.'''
+    return {
+        'params': [{'name': 'services',
+                    'short': 's',
+                    'long': 'service',
+                    'type': list,
+                    'default': [],
+                    'help': "the list of services to be restarted"}],
+        'actions': [(restart, )],
+    }
+
+
 def task__cleanall():
     '''clean everything there is to clean'''
     return {