76 lines
2.1 KiB
Haskell
76 lines
2.1 KiB
Haskell
{- git-annex command
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-
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- Copyright 2015-2016 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Command.CheckPresentKey where
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import Command
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import qualified Remote
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cmd :: Command
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cmd = noCommit $ noMessages $
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command "checkpresentkey" SectionPlumbing
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"check if key is present in remote"
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(paramPair paramKey (paramOptional paramRemote))
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(seek <$$> optParser)
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data CheckPresentKeyOptions = CheckPresentKeyOptions
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{ params :: CmdParams
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, batchOption :: BatchMode
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}
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optParser :: CmdParamsDesc -> Parser CheckPresentKeyOptions
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optParser desc = CheckPresentKeyOptions
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<$> cmdParams desc
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<*> parseBatchOption
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seek :: CheckPresentKeyOptions -> CommandSeek
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seek o = case batchOption o of
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NoBatch -> case params o of
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(ks:rn:[]) -> toRemote rn >>= (check ks . Just) >>= exitResult
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(ks:[]) -> check ks Nothing >>= exitResult
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_ -> wrongnumparams
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Batch fmt -> do
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checker <- case params o of
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(rn:[]) -> toRemote rn >>= \r -> return (flip check (Just r))
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[] -> return (flip check Nothing)
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_ -> wrongnumparams
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batchInput fmt Right $ checker >=> batchResult
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where
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wrongnumparams = giveup "Wrong number of parameters"
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data Result = Present | NotPresent | CheckFailure String
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check :: String -> Maybe Remote -> Annex Result
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check ks mr = case mr of
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Nothing -> go Nothing =<< Remote.keyPossibilities k
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Just r -> go Nothing [r]
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where
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k = toKey ks
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go Nothing [] = return NotPresent
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go (Just e) [] = return $ CheckFailure e
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go olderr (r:rs) = Remote.hasKey r k >>= \case
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Right True -> return Present
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Right False -> go olderr rs
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Left e -> go (Just e) rs
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exitResult :: Result -> Annex a
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exitResult Present = liftIO exitSuccess
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exitResult NotPresent = liftIO exitFailure
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exitResult (CheckFailure msg) = liftIO $ do
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hPutStrLn stderr msg
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exitWith $ ExitFailure 100
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batchResult :: Result -> Annex ()
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batchResult Present = liftIO $ putStrLn "1"
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batchResult _ = liftIO $ putStrLn "0"
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toKey :: String -> Key
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toKey = fromMaybe (giveup "Bad key") . deserializeKey
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toRemote :: String -> Annex Remote
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toRemote rn = maybe (giveup "Unknown remote") return
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=<< Remote.byNameWithUUID (Just rn)
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