3e0d2a0803
* New or changed repository descriptions in uuid.log now have a timestamp, which is used to ensure the newest description is used when the uuid.log has been merged. * Note that older versions of git-annex will display the timestamp as part of the repository description, which is ugly but otherwise harmless.
94 lines
2.3 KiB
Haskell
94 lines
2.3 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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- uuid.log stores a list of known uuids, and their descriptions.
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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 UUID (
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UUID,
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getUUID,
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getUncachedUUID,
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prepUUID,
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genUUID,
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describeUUID,
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uuidMap
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) where
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import qualified Data.Map as M
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import Data.Time.Clock.POSIX
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import Common.Annex
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import qualified Git
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import qualified Annex.Branch
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import Types.UUID
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import qualified Build.SysConfig as SysConfig
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import Config
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import UUIDLog
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configkey :: String
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configkey = "annex.uuid"
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{- Filename of uuid.log. -}
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logfile :: FilePath
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logfile = "uuid.log"
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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 = liftIO $ pOpen ReadFromPipe command params $ \h -> hGetLine h
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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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{- Looks up a repo's UUID. May return "" if none is known. -}
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getUUID :: Git.Repo -> Annex UUID
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getUUID 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 = do
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u <- getUUID =<< gitRepo
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when (null u) $ do
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uuid <- liftIO genUUID
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setConfig configkey uuid
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{- Records a description for a uuid in the log. -}
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describeUUID :: UUID -> String -> Annex ()
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describeUUID uuid desc = do
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ts <- liftIO $ getPOSIXTime
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Annex.Branch.change logfile $
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showLog id . changeLog ts uuid desc . parseLog Just
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{- Read the uuidLog into a simple Map -}
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uuidMap :: Annex (M.Map UUID String)
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uuidMap = (simpleMap . parseLog Just) <$> Annex.Branch.get logfile
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