41 lines
1.2 KiB
Haskell
41 lines
1.2 KiB
Haskell
{- git-annex key/value backend data type
|
|
-
|
|
- Most things should not need this, using Types instead
|
|
-
|
|
- Copyright 2010 Joey Hess <joey@kitenet.net>
|
|
-
|
|
- Licensed under the GNU GPL version 3 or higher.
|
|
-}
|
|
|
|
module Types.Backend where
|
|
|
|
import Types.Key
|
|
|
|
data Backend a = Backend {
|
|
-- name of this backend
|
|
name :: String,
|
|
-- converts a filename to a key
|
|
getKey :: FilePath -> a (Maybe Key),
|
|
-- stores a file's contents to a key
|
|
storeFileKey :: FilePath -> Key -> a Bool,
|
|
-- retrieves a key's contents to a file
|
|
retrieveKeyFile :: Key -> FilePath -> a Bool,
|
|
-- removes a key, optionally checking that enough copies are stored
|
|
-- elsewhere
|
|
removeKey :: Key -> Maybe Int -> a Bool,
|
|
-- checks if a backend is storing the content of a key
|
|
hasKey :: Key -> a Bool,
|
|
-- called during fsck to check a key
|
|
-- (second parameter may be the filename associated with it)
|
|
-- (third parameter may be the number of copies that there should
|
|
-- be of the key)
|
|
fsckKey :: Key -> Maybe FilePath -> Maybe Int -> a Bool,
|
|
-- Is a newer repesentation possible for a key?
|
|
upgradableKey :: Key -> a Bool
|
|
}
|
|
|
|
instance Show (Backend a) where
|
|
show backend = "Backend { name =\"" ++ name backend ++ "\" }"
|
|
|
|
instance Eq (Backend a) where
|
|
a == b = name a == name b
|