unify exception handling into Utility.Exception

Removed old extensible-exceptions, only needed for very old ghc.

Made webdav use Utility.Exception, to work after some changes in DAV's
exception handling.

Removed Annex.Exception. Mostly this was trivial, but note that
tryAnnex is replaced with tryNonAsync and catchAnnex replaced with
catchNonAsync. In theory that could be a behavior change, since the former
caught all exceptions, and the latter don't catch async exceptions.

However, in practice, nothing in the Annex monad uses async exceptions.
Grepping for throwTo and killThread only find stuff in the assistant,
which does not seem related.

Command.Add.undo is changed to accept a SomeException, and things
that use it for rollback now catch non-async exceptions, rather than
only IOExceptions.

1 files changed, 4 insertions, 5 deletions

diff --git a/CmdLine/Action.hs b/CmdLine/Action.hs
index 247c658bc..db4f768ac 100644
--- a/CmdLine/Action.hs
+++ b/CmdLine/Action.hs
@@ -13,7 +13,6 @@ import Common.Annex
 import qualified Annex
 import Types.Command
 import qualified Annex.Queue
-import Annex.Exception
 
 type CommandActionRunner = CommandStart -> CommandCleanup
 
@@ -37,14 +36,14 @@ performCommandAction Command { cmdseek = seek, cmdcheck = c, cmdname = name } pa
  - 
  - This should only be run in the seek stage. -}
 commandAction :: CommandActionRunner
-commandAction a = handle =<< tryAnnexIO go
+commandAction a = account =<< tryIO go
   where
 	go = do
 		Annex.Queue.flushWhenFull
 		callCommandAction a
-	handle (Right True) = return True
-	handle (Right False) = incerr
-	handle (Left err) = do
+	account (Right True) = return True
+	account (Right False) = incerr
+	account (Left err) = do
 		showErr err
 		showEndFail
 		incerr