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|
{- git-annex uuids
-
- Each git repository used by git-annex has an annex.uuid setting that
- uniquely identifies that repository.
-
-}
module UUID (
UUID,
getUUID,
prepUUID,
genUUID,
reposByUUID,
prettyPrintUUIDs
) where
import Control.Monad.State
import Maybe
import List
import System.Cmd.Utils
import System.IO
import GitRepo
import Types
type UUID = 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 :: Annex UUID
genUUID = liftIO $ pOpen ReadFromPipe "uuid" ["-m"] $ \h -> hGetLine h
{- Looks up a repo's UUID. May return "" if none is known.
-
- UUIDs of remotes are cached in git config, using keys named
- remote.<name>.annex-uuid
-
- -}
getUUID :: GitRepo -> Annex UUID
getUUID r = do
if ("" /= configured r)
then return $ configured r
else cached r
where
configured r = gitConfig r "annex.uuid" ""
cached r = do
g <- gitAnnex
return $ gitConfig g (configkey r) ""
configkey r = "remote." ++ (gitRepoRemoteName r) ++ ".annex-uuid"
{- Make sure that the repo has an annex.uuid setting. -}
prepUUID :: Annex ()
prepUUID = do
g <- gitAnnex
u <- getUUID g
if ("" == u)
then do
uuid <- genUUID
liftIO $ gitRun g ["config", configkey, uuid]
-- re-read git config and update the repo's state
u' <- liftIO $ gitConfigRead g
gitAnnexChange u'
return ()
else return ()
{- Filters a list of repos to ones that have listed UUIDs. -}
reposByUUID :: [GitRepo] -> [UUID] -> Annex [GitRepo]
reposByUUID repos uuids = do
filterM match repos
where
match r = do
u <- getUUID r
return $ isJust $ elemIndex u uuids
{- Pretty-prints a list of UUIDs
- TODO: use lookup file to really show pretty names. -}
prettyPrintUUIDs :: [UUID] -> String
prettyPrintUUIDs uuids =
unwords $ map (\u -> "\tUUID "++u++"\n") uuids
|
