propellor (0.3.0) unstable; urgency=medium

  * ipv6to4: Ensure interface is brought up automatically on boot.
  * Enabling unattended upgrades now ensures that cron is installed and
    running to perform them.
  * Properties can be scheduled to only be checked after a given time period.
  * Fix bootstrapping of dependencies.
  * Fix compilation on Debian stable.
  * Include security updates in sources.list for stable and testing.
  * Use ssh connection caching, especially when bootstrapping.
  * Properties now run in a Propellor monad, which provides access to
    attributes of the host.

# imported from the archive

1 files changed, 16 insertions, 0 deletions

diff --git a/Propellor/Exception.hs b/Propellor/Exception.hs
new file mode 100644
index 00000000..bd9212a8
--- /dev/null
+++ b/Propellor/Exception.hs
@@ -0,0 +1,16 @@
+{-# LANGUAGE PackageImports #-}
+
+module Propellor.Exception where
+
+import qualified "MonadCatchIO-transformers" Control.Monad.CatchIO as M
+import Control.Exception
+import Control.Applicative
+
+import Propellor.Types
+
+-- | Catches IO exceptions and returns FailedChange.
+catchPropellor :: Propellor Result -> Propellor Result
+catchPropellor a = either (\_ -> FailedChange) id <$> tryPropellor a
+
+tryPropellor :: Propellor a -> Propellor (Either IOException a)
+tryPropellor = M.try