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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
-
- uuid.log stores a list of known uuids, and their descriptions.
-
- Copyright 2010-2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module UUID (
UUID,
getUUID,
getUncachedUUID,
prepUUID,
genUUID,
describeUUID,
uuidMap
) where
import qualified Data.Map as M
import Data.Time.Clock.POSIX
import Common.Annex
import qualified Git
import qualified Annex.Branch
import Types.UUID
import qualified Build.SysConfig as SysConfig
import Config
import UUIDLog
configkey :: String
configkey = "annex.uuid"
{- Filename of uuid.log. -}
logfile :: FilePath
logfile = "uuid.log"
{- Generates a UUID. There is a library for this, but it's not packaged,
- so use the command line tool. -}
genUUID :: IO UUID
genUUID = liftIO $ pOpen ReadFromPipe command params $ \h -> hGetLine h
where
command = SysConfig.uuid
params = if command == "uuid"
-- request a random uuid be generated
then ["-m"]
-- uuidgen generates random uuid by default
else []
{- Looks up a repo's UUID. May return "" if none is known. -}
getUUID :: Git.Repo -> Annex UUID
getUUID r = do
g <- gitRepo
let c = cached g
let u = getUncachedUUID r
if c /= u && u /= ""
then do
updatecache g u
return u
else return c
where
cached g = Git.configGet g cachekey ""
updatecache g u = when (g /= r) $ setConfig cachekey u
cachekey = "remote." ++ fromMaybe "" (Git.repoRemoteName r) ++ ".annex-uuid"
getUncachedUUID :: Git.Repo -> UUID
getUncachedUUID r = Git.configGet r configkey ""
{- Make sure that the repo has an annex.uuid setting. -}
prepUUID :: Annex ()
prepUUID = do
u <- getUUID =<< gitRepo
when (null u) $ do
uuid <- liftIO genUUID
setConfig configkey uuid
{- Records a description for a uuid in the log. -}
describeUUID :: UUID -> String -> Annex ()
describeUUID uuid desc = do
ts <- liftIO $ getPOSIXTime
Annex.Branch.change logfile $
showLog id . changeLog ts uuid desc . parseLog Just
{- Read the uuidLog into a simple Map -}
uuidMap :: Annex (M.Map UUID String)
uuidMap = (simpleMap . parseLog Just) <$> Annex.Branch.get logfile
|
