96 lines
2.5 KiB
Haskell
96 lines
2.5 KiB
Haskell
{- git-annex uuids
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-
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- Each git repository used by git-annex has an annex.uuid setting that
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- uniquely identifies that repository.
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-
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- UUIDs of remotes are cached in git config, using keys named
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- remote.<name>.annex-uuid
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-
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- Copyright 2010-2013 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.UUID (
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getUUID,
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getRepoUUID,
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getUncachedUUID,
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prepUUID,
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genUUID,
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genUUIDInNameSpace,
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gCryptNameSpace,
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removeRepoUUID,
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storeUUID,
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setUUID,
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) where
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import Common.Annex
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import qualified Git
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import qualified Git.Config
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import Config
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import qualified Data.UUID as U
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import qualified Data.UUID.V5 as U5
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import System.Random
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import Data.Bits.Utils
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configkey :: ConfigKey
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configkey = annexConfig "uuid"
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{- Generates a random UUID, that does not include the MAC address. -}
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genUUID :: IO UUID
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genUUID = UUID . show <$> (randomIO :: IO U.UUID)
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{- Generates a UUID from a given string, using a namespace.
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- Given the same namespace, the same string will always result
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- in the same UUID. -}
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genUUIDInNameSpace :: U.UUID -> String -> UUID
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genUUIDInNameSpace namespace = UUID . show . U5.generateNamed namespace . s2w8
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{- Namespace used for UUIDs derived from git-remote-gcrypt ids. -}
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gCryptNameSpace :: U.UUID
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gCryptNameSpace = U5.generateNamed U5.namespaceURL $
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s2w8 "http://git-annex.branchable.com/design/gcrypt/"
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{- Get current repository's UUID. -}
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getUUID :: Annex UUID
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getUUID = getRepoUUID =<< gitRepo
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{- Looks up a repo's UUID, caching it in .git/config if it's not already. -}
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getRepoUUID :: Git.Repo -> Annex UUID
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getRepoUUID r = do
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c <- toUUID <$> getConfig cachekey ""
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let u = getUncachedUUID r
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if c /= u && u /= NoUUID
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then do
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updatecache u
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return u
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else return c
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where
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updatecache u = do
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g <- gitRepo
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when (g /= r) $ storeUUID cachekey u
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cachekey = remoteConfig r "uuid"
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removeRepoUUID :: Annex ()
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removeRepoUUID = unsetConfig configkey
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getUncachedUUID :: Git.Repo -> UUID
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getUncachedUUID = toUUID . Git.Config.get key ""
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where
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(ConfigKey key) = configkey
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{- Make sure that the repo has an annex.uuid setting. -}
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prepUUID :: Annex ()
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prepUUID = whenM ((==) NoUUID <$> getUUID) $
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storeUUID configkey =<< liftIO genUUID
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storeUUID :: ConfigKey -> UUID -> Annex ()
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storeUUID configfield = setConfig configfield . fromUUID
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{- Only sets the configkey in the Repo; does not change .git/config -}
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setUUID :: Git.Repo -> UUID -> IO Git.Repo
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setUUID r u = do
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let s = show configkey ++ "=" ++ fromUUID u
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Git.Config.store s r
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