Catch KeyboardInterrupt exceptions explicitely

Previously we did not catch KeyboardInterrupts explicitly as all of the
code was executed in forked child threads which would never receive
Ctrl-c exceptions. With the upcoming single threaded modus, this code
can be run in the main thread however, so we need to take care of
KeyboardInterrupts explicitly.

This was done wherever we would catch *ALL* exceptions universally and
print out an error message.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

offlineimap/folder/Base.py

@@ -288,6 +288,8 @@ class BaseFolder:
                     self.savemessage(newuid, message, flags, rtime)
                     self.deletemessage(uid)
                     uid = newuid
+        except (KeyboardInterrupt):
+            raise
         except:
             self.ui.warn("ERROR attempting to copy message " + str(uid) \
                  + " for account " + self.getaccountname() + ":" + str(sys.exc_info()[1]))
@@ -393,6 +395,8 @@ class BaseFolder:
 
         try:
             self.syncmessagesto_neguid(dest, applyto)
+        except (KeyboardInterrupt):
+            raise
         except:
             self.ui.warn("ERROR attempting to handle negative uids " \
                 + "for account " + self.getaccountname() + ":" + str(sys.exc_info()[1]))
@@ -402,6 +406,8 @@ class BaseFolder:
 
         try:
             self.syncmessagesto_delete(dest, applyto)
+        except (KeyboardInterrupt):
+            raise
         except:
             self.ui.warn("ERROR attempting to delete messages " \
                 + "for account " + self.getaccountname() + ":" + str(sys.exc_info()[1]))
@@ -412,6 +418,8 @@ class BaseFolder:
 
         try:
             self.syncmessagesto_flags(dest, applyto)
+        except (KeyboardInterrupt):
+            raise
         except:
             self.ui.warn("ERROR attempting to sync flags " \
                 + "for account " + self.getaccountname() + ":" + str(sys.exc_info()[1]))

offlineimap/folder/LocalStatus.py

@@ -108,7 +108,10 @@ class LocalStatusFolder(BaseFolder):
                     fd = os.open(os.path.dirname(self.filename), os.O_RDONLY)
                     os.fsync(fd)
                     os.close(fd)
+                except (KeyboardInterrupt):
+                    raise
                 except:
+                    #TODO, we should catch a specific Exception here, not ALL. But which?
                     pass
 
         finally:

offlineimap/repository/Base.py

@@ -163,11 +163,12 @@ class BaseRepository(CustomConfig.ConfigHelperMixin):
                     dest.makefolder(key)
                     for copyfolder in copyfolders:
                         copyfolder.makefolder(key.replace(dest.getsep(), copyfolder.getsep()))
+                except (KeyboardInterrupt):
+                    raise
                 except:
                     getglobalui().warn("ERROR Attempting to make folder " \
                         + key + ":"  +str(sys.exc_info()[1]))
 
-
         #
         # Find deleted folders.
         #