core, bridge, jp, quick_frontend: SàT stop more gracefully if bridge can't be initialised:

- new BridgeInitError and BridgeExceptionNoService are in core.exceptions
    - D-Bus NotSupported is catched in bridge, and launch a BridgeInitError
    - BridgeInitError stop SàT core, jp, and quick_frontends with an explanation message.
fix bug 27

frontends/src/bridge/DBus.py

@@ -20,6 +20,7 @@
 from bridge_frontend import BridgeFrontend
 import dbus
 from logging import debug, error
+from sat.core.exceptions import BridgeExceptionNoService, BridgeInitError
 
 from dbus.mainloop.glib import DBusGMainLoop
 DBusGMainLoop(set_as_default=True)
@@ -31,10 +32,6 @@ const_CORE_SUFFIX = ".core"
 const_PLUGIN_SUFFIX = ".plugin"
 
 
-class BridgeExceptionNoService(Exception):
-    pass
-
-
 class DBusBridgeFrontend(BridgeFrontend):
     def __init__(self):
         try:
@@ -48,6 +45,9 @@ class DBusBridgeFrontend(BridgeFrontend):
         except dbus.exceptions.DBusException, e:
             if e._dbus_error_name == 'org.freedesktop.DBus.Error.ServiceUnknown':
                 raise BridgeExceptionNoService
+            elif e._dbus_error_name == 'org.freedesktop.DBus.Error.NotSupported':
+                print u"D-Bus is not launched, please see README to see instructions on how to launch it"
+                raise BridgeInitError
             else:
                 raise e
         #props = self.db_core_iface.getProperties()

frontends/src/jp/jp

@@ -53,7 +53,8 @@ from os.path import abspath, basename, dirname
 from optparse import OptionParser
 from sat.tools.jid import JID
 import gobject
-from sat_frontends.bridge.DBus import DBusBridgeFrontend,BridgeExceptionNoService
+from sat_frontends.bridge.DBus import DBusBridgeFrontend
+from sat.core.exceptions import BridgeExceptionNoService, BridgeInitError
 from sat.tools.utils import clean_ustr
 import tarfile
 import tempfile
@@ -74,7 +75,9 @@ class JP(object):
             self.bridge=DBusBridgeFrontend()
         except BridgeExceptionNoService:
             print(_(u"Can't connect to SàT backend, are you sure it's launched ?"))
-            import sys
+            sys.exit(1)
+        except BridgeInitError:
+            print(_(u"Can't init bridge"))
             sys.exit(1)
         self.transfer_data = None
 

frontends/src/quick_frontend/quick_app.py

@@ -17,9 +17,11 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import sys
 from logging import debug, info, warning, error
 from sat.tools.jid  import JID
-from sat_frontends.bridge.DBus import DBusBridgeFrontend,BridgeExceptionNoService
+from sat_frontends.bridge.DBus import DBusBridgeFrontend
+from sat.core.exceptions import BridgeExceptionNoService, BridgeInitError
 from sat_frontends.quick_frontend.quick_utils import escapePrivate, unescapePrivate
 from optparse import OptionParser
 
@@ -41,7 +43,9 @@ class QuickApp(object):
             self.bridge=DBusBridgeFrontend()
         except BridgeExceptionNoService:
             print(_(u"Can't connect to SàT backend, are you sure it's launched ?"))
-            import sys
+            sys.exit(1)
+        except BridgeInitError:
+            print(_(u"Can't init bridge"))
             sys.exit(1)
         self.bridge.register("connected", self.connected)
         self.bridge.register("disconnected", self.disconnected)