70 lines
1.6 KiB
Haskell
70 lines
1.6 KiB
Haskell
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{- 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 2010-2011 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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) where
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import Common.Annex
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import qualified Git
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import qualified Build.SysConfig as SysConfig
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import Config
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configkey :: String
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configkey = "annex.uuid"
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{- Generates a UUID. There is a library for this, but it's not packaged,
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- so use the command line tool. -}
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genUUID :: IO UUID
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genUUID = pOpen ReadFromPipe command params hGetLine
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where
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command = SysConfig.uuid
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params = if command == "uuid"
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-- request a random uuid be generated
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then ["-m"]
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-- uuidgen generates random uuid by default
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else []
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getUUID :: Annex UUID
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getUUID = getRepoUUID =<< gitRepo
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{- Looks up a repo's UUID. May return "" if none is known. -}
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getRepoUUID :: Git.Repo -> Annex UUID
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getRepoUUID r = do
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g <- gitRepo
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let c = cached g
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let u = getUncachedUUID r
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if c /= u && u /= ""
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then do
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updatecache g u
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return u
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else return c
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where
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cached g = Git.configGet g cachekey ""
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updatecache g u = when (g /= r) $ setConfig cachekey u
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cachekey = "remote." ++ fromMaybe "" (Git.repoRemoteName r) ++ ".annex-uuid"
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getUncachedUUID :: Git.Repo -> UUID
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getUncachedUUID r = Git.configGet r 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 (null <$> getUUID) $
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setConfig configkey =<< liftIO genUUID
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