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{- git-annex "file" backend
- -}
module BackendFile (backend) where
import Types
backend = Backend {
name = "file",
getKey = keyValue,
storeFileKey = dummyStore,
retrieveKeyFile = copyFromOtherRepo,
removeKey = dummyRemove
}
-- direct mapping from filename to key
keyValue :: State -> FilePath -> IO (Maybe Key)
keyValue state file = return $ Just file
{- This backend does not really do any independant data storage,
- it relies on the file contents in .git/annex/ in this repo,
- and other accessible repos. So storing or removing a key is
- a no-op. -}
dummyStore :: State -> FilePath -> Key -> IO (Bool)
dummyStore state file key = return True
dummyRemove :: State -> Key -> IO Bool
dummyRemove state url = return False
{- Try to find a copy of the file in one of the other repos,
- and copy it over to this one. -}
copyFromOtherRepo :: State -> Key -> FilePath -> IO (Bool)
copyFromOtherRepo state key file =
-- 1. get ordered list of remotes (local repos, then remote repos)
-- 2. read locationlog for file
-- 3. filter remotes list to ones that have file
-- 4. attempt to transfer from each remote until success
error "copyFromOtherRepo unimplemented" -- TODO
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