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|
{- git-annex trust levels
-
- Copyright 2010 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Trust (
TrustLevel(..),
trustLog,
trustGet,
trustMap,
trustMapParse,
trustSet
) where
import Control.Monad.State
import qualified Data.Map as M
import qualified GitRepo as Git
import Types
import UUID
import Locations
import qualified Annex
import Utility
data TrustLevel = SemiTrusted | UnTrusted | Trusted
deriving Eq
instance Show TrustLevel where
show SemiTrusted = "?"
show UnTrusted = "0"
show Trusted = "1"
instance Read TrustLevel where
readsPrec _ "1" = [(Trusted, "")]
readsPrec _ "0" = [(UnTrusted, "")]
readsPrec _ _ = [(SemiTrusted, "")]
{- Filename of trust.log. -}
trustLog :: Annex FilePath
trustLog = do
g <- Annex.gitRepo
return $ gitStateDir g ++ "trust.log"
{- Returns a list of UUIDs at the specified trust level. -}
trustGet :: TrustLevel -> Annex [UUID]
trustGet level = do
m <- trustMap
return $ M.keys $ M.filter (== level) m
{- Read the trustLog into a map. -}
trustMap :: Annex (M.Map UUID TrustLevel)
trustMap = do
logfile <- trustLog
s <- liftIO $ catch (readFile logfile) ignoreerror
return $ trustMapParse s
where
ignoreerror _ = return ""
{- Trust map parser. -}
trustMapParse :: String -> M.Map UUID TrustLevel
trustMapParse s = M.fromList $ map pair $ filter (not . null) $ lines s
where
pair l
| length w > 1 = (w !! 0, read (w !! 1) :: TrustLevel)
-- for back-compat; the trust log used to only
-- list trusted uuids
| otherwise = (w !! 0, Trusted)
where
w = words l
{- Changes the trust level for a uuid in the trustLog, and commits it. -}
trustSet :: UUID -> TrustLevel -> Annex ()
trustSet uuid level = do
when (null uuid) $
error "unknown UUID; cannot modify trust level"
m <- trustMap
when (M.lookup uuid m /= Just level) $ do
let m' = M.insert uuid level m
logfile <- trustLog
liftIO $ safeWriteFile logfile (serialize m')
g <- Annex.gitRepo
liftIO $ Git.run g ["add", logfile]
liftIO $ Git.run g ["commit", "-q", "-m", "git annex trust change", logfile]
where
serialize m = unlines $ map showpair $ M.toList m
showpair (u, t) = u ++ " " ++ show t
|
