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{- git-annex uuids
-
- Each git repository used by git-annex has an annex.uuid setting that
- uniquely identifies that repository.
-
- UUIDs of remotes are cached in git config, using keys named
- remote.<name>.annex-uuid
-
- Copyright 2010-2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Annex.UUID (
getUUID,
getRepoUUID,
getUncachedUUID,
prepUUID,
genUUID
) where
import Common.Annex
import qualified Git
import qualified Build.SysConfig as SysConfig
import Config
configkey :: String
configkey = "annex.uuid"
{- Generates a UUID. There is a library for this, but it's not packaged,
- so use the command line tool. -}
genUUID :: IO UUID
genUUID = pOpen ReadFromPipe command params $ liftM read . hGetLine
where
command = SysConfig.uuid
params = if command == "uuid"
-- request a random uuid be generated
then ["-m"]
-- uuidgen generates random uuid by default
else []
getUUID :: Annex UUID
getUUID = getRepoUUID =<< gitRepo
{- Looks up a repo's UUID. May return "" if none is known. -}
getRepoUUID :: Git.Repo -> Annex UUID
getRepoUUID r = do
g <- gitRepo
let c = cached g
let u = getUncachedUUID r
if c /= u && u /= NoUUID
then do
updatecache g u
return u
else return c
where
cached g = read $ Git.configGet g cachekey ""
updatecache g u = when (g /= r) $ storeUUID cachekey u
cachekey = "remote." ++ fromMaybe "" (Git.repoRemoteName r) ++ ".annex-uuid"
getUncachedUUID :: Git.Repo -> UUID
getUncachedUUID r = read $ Git.configGet r configkey ""
{- Make sure that the repo has an annex.uuid setting. -}
prepUUID :: Annex ()
prepUUID = whenM ((==) NoUUID <$> getUUID) $
storeUUID configkey =<< liftIO genUUID
storeUUID :: String -> UUID -> Annex ()
storeUUID configfield uuid = setConfig configfield (show uuid)
|
