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{- git-annex key/value backend data type
-
- Most things should not need this, using Types instead
-
- Copyright 2010,2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Types.Backend where
import Types.Key
import Types.KeySource
data BackendA a = Backend
{ name :: String
, getKey :: KeySource -> a (Maybe Key)
-- Checks the content of a key.
, fsckKey :: Maybe (Key -> FilePath -> a Bool)
-- Checks if a key can be upgraded to a better form.
, canUpgradeKey :: Maybe (Key -> Bool)
-- Checks if there is a fast way to migrate a key to a different
-- backend (ie, without re-hashing).
, fastMigrate :: Maybe (Key -> BackendA a -> Maybe Key)
-- Checks if a key is known (or assumed) to always refer to the
-- same data.
, isStableKey :: Key -> Bool
}
instance Show (BackendA a) where
show backend = "Backend { name =\"" ++ name backend ++ "\" }"
instance Eq (BackendA a) where
a == b = name a == name b
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