213 lines
6.8 KiB
Haskell
213 lines
6.8 KiB
Haskell
{- git-annex remotes
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-
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- Copyright 2011 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 Remote (
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Remote,
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uuid,
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name,
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storeKey,
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retrieveKeyFile,
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retrieveKeyFileCheap,
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removeKey,
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hasKey,
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hasKeyCheap,
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whereisKey,
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remoteTypes,
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remoteList,
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enabledRemoteList,
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remoteMap,
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uuidDescriptions,
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byName,
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prettyPrintUUIDs,
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remotesWithUUID,
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remotesWithoutUUID,
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keyLocations,
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keyPossibilities,
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keyPossibilitiesTrusted,
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nameToUUID,
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showTriedRemotes,
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showLocations,
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forceTrust,
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logStatus
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) where
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import qualified Data.Map as M
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import Text.JSON
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import Text.JSON.Generic
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import Common.Annex
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import Types.Remote
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import qualified Annex
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import Annex.UUID
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import Logs.UUID
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import Logs.Trust
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import Logs.Location
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import Remote.List
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{- Map from UUIDs of Remotes to a calculated value. -}
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remoteMap :: (Remote -> a) -> Annex (M.Map UUID a)
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remoteMap c = M.fromList . map (\r -> (uuid r, c r)) .
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filter (\r -> uuid r /= NoUUID) <$> remoteList
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{- Map of UUIDs and their descriptions.
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- The names of Remotes are added to suppliment any description that has
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- been set for a repository. -}
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uuidDescriptions :: Annex (M.Map UUID String)
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uuidDescriptions = M.unionWith addName <$> uuidMap <*> remoteMap name
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addName :: String -> String -> String
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addName desc n
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| desc == n = desc
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| null desc = n
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| otherwise = n ++ " (" ++ desc ++ ")"
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{- When a name is specified, looks up the remote matching that name.
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- (Or it can be a UUID.) Only finds currently configured git remotes. -}
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byName :: Maybe String -> Annex (Maybe Remote)
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byName Nothing = return Nothing
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byName (Just n) = either error Just <$> byName' n
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byName' :: String -> Annex (Either String Remote)
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byName' "" = return $ Left "no remote specified"
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byName' n = handle . filter matching <$> remoteList
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where
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handle [] = Left $ "there is no git remote named \"" ++ n ++ "\""
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handle match = Right $ Prelude.head match
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matching r = n == name r || toUUID n == uuid r
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{- Looks up a remote by name (or by UUID, or even by description),
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- and returns its UUID. Finds even remotes that are not configured in
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- .git/config. -}
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nameToUUID :: String -> Annex UUID
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nameToUUID "." = getUUID -- special case for current repo
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nameToUUID "here" = getUUID
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nameToUUID "" = error "no remote specified"
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nameToUUID n = byName' n >>= go
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where
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go (Right r) = return $ uuid r
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go (Left e) = fromMaybe (error e) <$> bydescription
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bydescription = do
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m <- uuidMap
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case M.lookup n $ transform swap m of
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Just u -> return $ Just u
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Nothing -> return $ byuuid m
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byuuid m = M.lookup (toUUID n) $ transform double m
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transform a = M.fromList . map a . M.toList
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swap (a, b) = (b, a)
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double (a, _) = (a, a)
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{- Pretty-prints a list of UUIDs of remotes, for human display.
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-
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- Shows descriptions from the uuid log, falling back to remote names,
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- as some remotes may not be in the uuid log.
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-
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- When JSON is enabled, also generates a machine-readable description
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- of the UUIDs. -}
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prettyPrintUUIDs :: String -> [UUID] -> Annex String
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prettyPrintUUIDs desc uuids = do
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hereu <- getUUID
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m <- uuidDescriptions
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maybeShowJSON [(desc, map (jsonify m hereu) uuids)]
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return $ unwords $ map (\u -> "\t" ++ prettify m hereu u ++ "\n") uuids
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where
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finddescription m u = M.findWithDefault "" u m
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prettify m hereu u
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| not (null d) = fromUUID u ++ " -- " ++ d
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| otherwise = fromUUID u
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where
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ishere = hereu == u
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n = finddescription m u
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d
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| null n && ishere = "here"
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| ishere = addName n "here"
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| otherwise = n
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jsonify m hereu u = toJSObject
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[ ("uuid", toJSON $ fromUUID u)
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, ("description", toJSON $ finddescription m u)
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, ("here", toJSON $ hereu == u)
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]
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{- Filters a list of remotes to ones that have the listed uuids. -}
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remotesWithUUID :: [Remote] -> [UUID] -> [Remote]
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remotesWithUUID rs us = filter (\r -> uuid r `elem` us) rs
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{- Filters a list of remotes to ones that do not have the listed uuids. -}
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remotesWithoutUUID :: [Remote] -> [UUID] -> [Remote]
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remotesWithoutUUID rs us = filter (\r -> uuid r `notElem` us) rs
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{- List of repository UUIDs that the location log indicates may have a key.
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- Dead repositories are excluded. -}
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keyLocations :: Key -> Annex [UUID]
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keyLocations key = snd <$> (trustPartition DeadTrusted =<< loggedLocations key)
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{- Cost ordered lists of remotes that the location log indicates
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- may have a key.
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-}
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keyPossibilities :: Key -> Annex [Remote]
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keyPossibilities key = fst <$> keyPossibilities' key []
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{- Cost ordered lists of remotes that the location log indicates
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- may have a key.
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-
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- Also returns a list of UUIDs that are trusted to have the key
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- (some may not have configured remotes).
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-}
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keyPossibilitiesTrusted :: Key -> Annex ([Remote], [UUID])
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keyPossibilitiesTrusted key = keyPossibilities' key =<< trustGet Trusted
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keyPossibilities' :: Key -> [UUID] -> Annex ([Remote], [UUID])
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keyPossibilities' key trusted = do
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u <- getUUID
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-- uuids of all remotes that are recorded to have the key
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validuuids <- filter (/= u) <$> keyLocations key
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-- note that validuuids is assumed to not have dups
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let validtrusteduuids = validuuids `intersect` trusted
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-- remotes that match uuids that have the key
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allremotes <- enabledRemoteList
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let validremotes = remotesWithUUID allremotes validuuids
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return (sort validremotes, validtrusteduuids)
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{- Displays known locations of a key. -}
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showLocations :: Key -> [UUID] -> Annex ()
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showLocations key exclude = do
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u <- getUUID
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uuids <- keyLocations key
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untrusteduuids <- trustGet UnTrusted
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let uuidswanted = filteruuids uuids (u:exclude++untrusteduuids)
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let uuidsskipped = filteruuids uuids (u:exclude++uuidswanted)
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ppuuidswanted <- Remote.prettyPrintUUIDs "wanted" uuidswanted
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ppuuidsskipped <- Remote.prettyPrintUUIDs "skipped" uuidsskipped
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showLongNote $ message ppuuidswanted ppuuidsskipped
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where
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filteruuids l x = filter (`notElem` x) l
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message [] [] = "No other repository is known to contain the file."
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message rs [] = "Try making some of these repositories available:\n" ++ rs
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message [] us = "Also these untrusted repositories may contain the file:\n" ++ us
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message rs us = message rs [] ++ message [] us
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showTriedRemotes :: [Remote] -> Annex ()
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showTriedRemotes [] = return ()
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showTriedRemotes remotes =
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showLongNote $ "Unable to access these remotes: " ++
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join ", " (map name remotes)
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forceTrust :: TrustLevel -> String -> Annex ()
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forceTrust level remotename = do
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u <- nameToUUID remotename
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Annex.changeState $ \s ->
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s { Annex.forcetrust = M.insert u level (Annex.forcetrust s) }
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{- Used to log a change in a remote's having a key. The change is logged
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- in the local repo, not on the remote. The process of transferring the
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- key to the remote, or removing the key from it *may* log the change
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- on the remote, but this cannot always be relied on. -}
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logStatus :: Remote -> Key -> LogStatus -> Annex ()
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logStatus remote key = logChange key (uuid remote)
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