97 lines
2.2 KiB
Haskell
97 lines
2.2 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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-}
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module UUID (
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UUID,
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getUUID,
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prepUUID,
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genUUID,
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reposByUUID,
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prettyPrintUUIDs
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) where
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import Control.Monad.State
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import Maybe
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import List
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import System.Cmd.Utils
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import System.IO
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import qualified GitRepo as Git
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import Types
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import qualified Annex
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type UUID = 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 :: Annex UUID
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genUUID = liftIO $ pOpen ReadFromPipe "uuid" ["-m"] $ \h -> hGetLine h
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{- Looks up a repo's UUID. May return "" if none is known.
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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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- -}
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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 r g
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let u = uncached r
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if (c /= u && u /= "")
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then do
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updatecache g r u
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return u
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else return c
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where
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uncached r = Git.configGet r "annex.uuid" ""
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cached r g = Git.configGet g (cachekey r) ""
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updatecache g r u = do
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if (g /= r)
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then setConfig (cachekey r) u
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else return ()
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cachekey r = "remote." ++ (Git.repoRemoteName r) ++ ".annex-uuid"
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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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if ("" == u)
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then do
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uuid <- genUUID
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setConfig configkey uuid
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else return ()
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{- Changes a git config setting in both internal state and .git/config -}
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setConfig :: String -> String -> Annex ()
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setConfig key value = do
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g <- Annex.gitRepo
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liftIO $ Git.run g ["config", key, value]
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-- re-read git config and update the repo's state
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g' <- liftIO $ Git.configRead g
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Annex.gitRepoChange g'
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return ()
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{- Filters a list of repos to ones that have listed UUIDs. -}
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reposByUUID :: [Git.Repo] -> [UUID] -> Annex [Git.Repo]
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reposByUUID repos uuids = do
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filterM match repos
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where
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match r = do
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u <- getUUID r
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return $ isJust $ elemIndex u uuids
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{- Pretty-prints a list of UUIDs
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- TODO: use lookup file to really show pretty names. -}
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prettyPrintUUIDs :: [UUID] -> String
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prettyPrintUUIDs uuids =
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unwords $ map (\u -> "\tUUID "++u++"\n") uuids
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