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{- git SHA stuff
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Git.Sha where
import Common
import Git.Types
{- Runs an action that causes a git subcommand to emit a sha, and strips
any trailing newline, returning the sha. -}
getSha :: String -> IO String -> IO Sha
getSha subcommand a = do
t <- a
let t' = if last t == '\n'
then init t
else t
when (length t' /= shaSize) $
error $ "failed to read sha from git " ++ subcommand ++ " (" ++ t' ++ ")"
return $ Ref t'
{- Size of a git sha. -}
shaSize :: Int
shaSize = 40
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