diff options
| author |  Joey Hess <joeyh@joeyh.name> | 2016-11-15 21:29:54 -0400 |
|---|---|---|
| committer | Joey Hess <joeyh@joeyh.name> | 2016-11-15 21:29:54 -0400 |
| commit | 381766efcdddb4c8706408a90c515470a6aa43a7 (patch) | |
| tree | dda693b36724839ff2daff0e0766b7bdd883ea2c /Utility/Exception.hs | |
| parent | 27fafd61c39f8436e19e8fd449b5851ead10bbd1 (diff) | |
Avoid backtraces on expected failures when built with ghc 8; only use backtraces for unexpected errors.
ghc 8 added backtraces on uncaught errors. This is great, but git-annex was
using error in many places for a error message targeted at the user, in
some known problem case. A backtrace only confuses such a message, so omit it.
Notably, commands like git annex drop that failed due to eg, numcopies,
used to use error, so had a backtrace.
This commit was sponsored by Ethan Aubin.
Diffstat (limited to 'Utility/Exception.hs')
| -rw-r--r-- | Utility/Exception.hs | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/Utility/Exception.hs b/Utility/Exception.hs index 0ffc7103f..5cd8fd199 100644 --- a/Utility/Exception.hs +++ b/Utility/Exception.hs @@ -1,6 +1,6 @@ {- Simple IO exception handling (and some more) - - - Copyright 2011-2015 Joey Hess <id@joeyh.name> + - Copyright 2011-2016 Joey Hess <id@joeyh.name> - - License: BSD-2-clause -} @@ -10,6 +10,7 @@ module Utility.Exception ( module X, + giveup, catchBoolIO, catchMaybeIO, catchDefaultIO, @@ -40,6 +41,17 @@ import GHC.IO.Exception (IOErrorType(..)) import Utility.Data +{- Like error, this throws an exception. Unlike error, if this exception + - is not caught, it won't generate a backtrace. So use this for situations + - where there's a problem that the user is excpected to see in some + - circumstances. -} +giveup :: [Char] -> a +#if MIN_VERSION_base(4,9,0) +giveup = errorWithoutStackTrace +#else +giveup = error +#endif + {- Catches IO errors and returns a Bool -} catchBoolIO :: MonadCatch m => m Bool -> m Bool catchBoolIO = catchDefaultIO False |