bf460a0a98
Many functions took the repo as their first parameter. Changing it consistently to be the last parameter allows doing some useful things with currying, that reduce boilerplate. In particular, g <- gitRepo is almost never needed now, instead use inRepo to run an IO action in the repo, and fromRepo to get a value from the repo. This also provides more opportunities to use monadic and applicative combinators.
44 lines
1,023 B
Haskell
44 lines
1,023 B
Haskell
{- git-annex repository versioning
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-
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- Copyright 2010 Joey Hess <joey@kitenet.net>
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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 Annex.Version where
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import Common.Annex
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import qualified Git
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import Config
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type Version = String
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defaultVersion :: Version
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defaultVersion = "3"
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supportedVersions :: [Version]
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supportedVersions = [defaultVersion]
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upgradableVersions :: [Version]
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upgradableVersions = ["0", "1", "2"]
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versionField :: String
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versionField = "annex.version"
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getVersion :: Annex (Maybe Version)
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getVersion = handle <$> fromRepo (Git.configGet versionField "")
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where
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handle [] = Nothing
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handle v = Just v
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setVersion :: Annex ()
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setVersion = setConfig versionField defaultVersion
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checkVersion :: Version -> Annex ()
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checkVersion v
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| v `elem` supportedVersions = return ()
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| v `elem` upgradableVersions = err "Upgrade this repository: git-annex upgrade"
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| otherwise = err "Upgrade git-annex."
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where
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err msg = error $ "Repository version " ++ v ++
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" is not supported. " ++ msg
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