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{- git-annex backend utilities
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Backend.Utilities where
import Data.Hash.MD5
import Common.Annex
{- Generates a keyName from an input string. Takes care of sanitizing it.
- If it's not too long, the full string is used as the keyName.
- Otherwise, it's truncated at half the filename length limit, and its
- md5 is prepended to ensure a unique key. -}
genKeyName :: String -> Annex String
genKeyName s = do
limit <- liftIO . fileNameLengthLimit =<< fromRepo gitAnnexDir
let s' = preSanitizeKeyName s
let truncs = truncateFilePath (limit `div` 2) s'
return $ if s' == truncs
then s'
else truncs ++ "-" ++ md5s (Str s)
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