130 lines
3.1 KiB
Haskell
130 lines
3.1 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 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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prettyPrintUUIDs,
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describeUUID,
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uuidLog,
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uuidMap
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) where
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import Control.Monad.State
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import System.Cmd.Utils
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import System.IO
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import qualified Data.Map as M
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import Data.Maybe
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import qualified GitRepo as Git
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import Types
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import Locations
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import qualified Annex
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import Utility
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import qualified SysConfig
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type UUID = String
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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 = 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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-}
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getUUID :: Git.Repo -> Annex UUID
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getUUID r = do
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g <- Annex.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) $ Annex.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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g <- Annex.gitRepo
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u <- getUUID g
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when ("" == u) $ do
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uuid <- liftIO $ genUUID
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Annex.setConfig configkey uuid
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{- Pretty-prints a list of UUIDs -}
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prettyPrintUUIDs :: [UUID] -> Annex String
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prettyPrintUUIDs uuids = do
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g <- Annex.gitRepo
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here <- getUUID g
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m <- uuidMap
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return $ unwords $ map (\u -> "\t" ++ prettify m u here ++ "\n") uuids
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where
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prettify m u here = base ++ ishere
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where
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base = if not $ null $ findlog m u
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then u ++ " -- " ++ findlog m u
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else u
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ishere = if here == u then " <-- here" else ""
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findlog m u = M.findWithDefault "" u m
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{- Records a description for a uuid in the uuidLog. -}
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describeUUID :: UUID -> String -> Annex ()
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describeUUID uuid desc = do
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m <- uuidMap
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let m' = M.insert uuid desc m
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logfile <- uuidLog
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liftIO $ safeWriteFile logfile (serialize m')
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where
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serialize m = unlines $ map (\(u, d) -> u++" "++d) $ M.toList m
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{- Read and parse the uuidLog into a Map -}
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uuidMap :: Annex (M.Map UUID String)
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uuidMap = do
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logfile <- uuidLog
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s <- liftIO $ catch (readFile logfile) ignoreerror
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return $ M.fromList $ map pair $ lines s
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where
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pair l =
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if 1 < length (words l)
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then (head $ words l, unwords $ drop 1 $ words l)
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else ("", "")
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ignoreerror _ = return ""
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{- Filename of uuid.log. -}
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uuidLog :: Annex FilePath
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uuidLog = do
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g <- Annex.gitRepo
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return $ gitStateDir g ++ "uuid.log"
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