[fix] handle grabbing services status from alternate names, fix yunohost/issues#1134

src/yunohost/service.py

@@ -227,6 +227,27 @@ def service_status(names=[]):
 
         status = _get_service_information_from_systemd(name)
 
+        # try to get status using alternative version if they exists
+        # this is for mariadb/mysql but is generic in case of
+        alternates = services[name].get("alternates", [])
+        while status is None and alternates:
+            status = _get_service_information_from_systemd(alternates.pop())
+
+        if status is None:
+            logger.error("Failed to get status information via dbus for service %s, systemctl didn't recognize this service ('NoSuchUnit')." % name)
+            result[name] = {
+                'status': "unknown",
+                'loaded': "unknown",
+                'active': "unknown",
+                'active_at': {
+                    "timestamp": "unknown",
+                    "human": "unknown",
+                },
+                'description': "Error: failed to get information for this service, it doesn't exists for systemd",
+                'service_file_path': "unknown",
+            }
+
+        else:
             translation_key = "service_description_%s" % name
             description = m18n.n(translation_key)
 
@@ -256,13 +277,20 @@ def service_status(names=[]):
 def _get_service_information_from_systemd(service):
     "this is the equivalent of 'systemctl status $service'"
     import dbus
+    from dbus.exceptions import DBusException
 
     d = dbus.SystemBus()
 
     systemd = d.get_object('org.freedesktop.systemd1','/org/freedesktop/systemd1')
     manager = dbus.Interface(systemd, 'org.freedesktop.systemd1.Manager')
 
+    try:
         service_path = manager.GetUnit(service + ".service")
+    except DBusException as exception:
+        if exception.get_dbus_name() == 'org.freedesktop.systemd1.NoSuchUnit':
+            return None
+        raise
+
     service_proxy = d.get_object('org.freedesktop.systemd1', service_path)
 
     # unit_proxy = dbus.Interface(service_proxy, 'org.freedesktop.systemd1.Unit',)