git-annex/Remote.hs

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{- git-annex remotes
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Remote (
Remote,
uuid,
name,
storeKey,
retrieveKeyFile,
retrieveKeyFileCheap,
removeKey,
hasKey,
hasKeyCheap,
whereisKey,
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remoteTypes,
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remoteList,
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specialRemote,
remoteMap,
uuidDescriptions,
byName,
byNameWithUUID,
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byCost,
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prettyPrintUUIDs,
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prettyListUUIDs,
prettyUUID,
remoteFromUUID,
remotesWithUUID,
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remotesWithoutUUID,
keyLocations,
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keyPossibilities,
keyPossibilitiesTrusted,
nameToUUID,
showTriedRemotes,
showLocations,
forceTrust,
logStatus
) where
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import qualified Data.Map as M
import Text.JSON
import Text.JSON.Generic
import Data.Tuple
import Data.Ord
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import Common.Annex
import Types.Remote
import qualified Annex
import Annex.UUID
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import Logs.UUID
import Logs.Trust
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import Logs.Location hiding (logStatus)
import Remote.List
import Config
{- Map from UUIDs of Remotes to a calculated value. -}
remoteMap :: (Remote -> a) -> Annex (M.Map UUID a)
remoteMap c = M.fromList . map (\r -> (uuid r, c r)) .
filter (\r -> uuid r /= NoUUID) <$> remoteList
{- Map of UUIDs of remotes and their descriptions.
- The names of Remotes are added to suppliment any description that has
- been set for a repository. -}
uuidDescriptions :: Annex (M.Map UUID String)
uuidDescriptions = M.unionWith addName <$> uuidMap <*> remoteMap name
addName :: String -> String -> String
addName desc n
| desc == n = desc
| null desc = n
| otherwise = n ++ " (" ++ desc ++ ")"
{- When a name is specified, looks up the remote matching that name.
- (Or it can be a UUID.) -}
byName :: Maybe String -> Annex (Maybe Remote)
byName Nothing = return Nothing
byName (Just n) = either error Just <$> byName' n
{- Like byName, but the remote must have a configured UUID. -}
byNameWithUUID :: Maybe String -> Annex (Maybe Remote)
byNameWithUUID = checkuuid <=< byName
where
checkuuid Nothing = return Nothing
checkuuid (Just r)
| uuid r == NoUUID = do
let e = "cannot determine uuid for " ++ name r
if remoteAnnexIgnore (gitconfig r)
then error $ e ++ " (" ++ show (remoteConfig (repo r) "ignore") ++ " is set)"
else error e
| otherwise = return $ Just r
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byName' :: String -> Annex (Either String Remote)
byName' "" = return $ Left "no remote specified"
byName' n = handle . filter matching <$> remoteList
where
handle [] = Left $ "there is no available git remote named \"" ++ n ++ "\""
handle (match:_) = Right match
matching r = n == name r || toUUID n == uuid r
{- Looks up a remote by name (or by UUID, or even by description),
- and returns its UUID. Finds even remotes that are not configured in
- .git/config. -}
nameToUUID :: String -> Annex UUID
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nameToUUID "." = getUUID -- special case for current repo
nameToUUID "here" = getUUID
nameToUUID "" = error "no remote specified"
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nameToUUID n = byName' n >>= go
where
go (Right r) = return $ uuid r
go (Left e) = fromMaybe (error e) <$> bydescription
bydescription = do
m <- uuidMap
case M.lookup n $ transform swap m of
Just u -> return $ Just u
Nothing -> return $ byuuid m
byuuid m = M.lookup (toUUID n) $ transform double m
transform a = M.fromList . map a . M.toList
double (a, _) = (a, a)
{- Pretty-prints a list of UUIDs of remotes, for human display.
-
- When JSON is enabled, also generates a machine-readable description
- of the UUIDs. -}
prettyPrintUUIDs :: String -> [UUID] -> Annex String
prettyPrintUUIDs desc uuids = do
hereu <- getUUID
m <- uuidDescriptions
maybeShowJSON [(desc, map (jsonify m hereu) uuids)]
return $ unwords $ map (\u -> "\t" ++ prettify m hereu u ++ "\n") uuids
where
finddescription m u = M.findWithDefault "" u m
prettify m hereu u
| not (null d) = fromUUID u ++ " -- " ++ d
| otherwise = fromUUID u
where
ishere = hereu == u
n = finddescription m u
d
| null n && ishere = "here"
| ishere = addName n "here"
| otherwise = n
jsonify m hereu u = toJSObject
[ ("uuid", toJSON $ fromUUID u)
, ("description", toJSON $ finddescription m u)
, ("here", toJSON $ hereu == u)
]
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{- List of remote names and/or descriptions, for human display. -}
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prettyListUUIDs :: [UUID] -> Annex [String]
prettyListUUIDs uuids = do
hereu <- getUUID
m <- uuidDescriptions
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return $ map (prettify m hereu) uuids
where
finddescription m u = M.findWithDefault "" u m
prettify m hereu u
| u == hereu = addName n "here"
| otherwise = n
where
n = finddescription m u
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{- Nice display of a remote's name and/or description. -}
prettyUUID :: UUID -> Annex String
prettyUUID u = concat <$> prettyListUUIDs [u]
{- Gets the remote associated with a UUID.
- There's no associated remote when this is the UUID of the local repo. -}
remoteFromUUID :: UUID -> Annex (Maybe Remote)
remoteFromUUID u = ifM ((==) u <$> getUUID)
( return Nothing
, Just . fromMaybe (error "Unknown UUID") . M.lookup u <$> remoteMap id
)
{- Filters a list of remotes to ones that have the listed uuids. -}
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remotesWithUUID :: [Remote] -> [UUID] -> [Remote]
remotesWithUUID rs us = filter (\r -> uuid r `elem` us) rs
{- Filters a list of remotes to ones that do not have the listed uuids. -}
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remotesWithoutUUID :: [Remote] -> [UUID] -> [Remote]
remotesWithoutUUID rs us = filter (\r -> uuid r `notElem` us) rs
{- List of repository UUIDs that the location log indicates may have a key.
- Dead repositories are excluded. -}
keyLocations :: Key -> Annex [UUID]
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keyLocations key = trustExclude DeadTrusted =<< loggedLocations key
{- Cost ordered lists of remotes that the location log indicates
- may have a key.
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-}
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keyPossibilities :: Key -> Annex [Remote]
keyPossibilities key = fst <$> keyPossibilities' key []
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{- Cost ordered lists of remotes that the location log indicates
- may have a key.
-
- Also returns a list of UUIDs that are trusted to have the key
- (some may not have configured remotes).
-}
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keyPossibilitiesTrusted :: Key -> Annex ([Remote], [UUID])
keyPossibilitiesTrusted key = keyPossibilities' key =<< trustGet Trusted
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keyPossibilities' :: Key -> [UUID] -> Annex ([Remote], [UUID])
keyPossibilities' key trusted = do
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u <- getUUID
-- uuids of all remotes that are recorded to have the key
validuuids <- filter (/= u) <$> keyLocations key
-- note that validuuids is assumed to not have dups
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let validtrusteduuids = validuuids `intersect` trusted
-- remotes that match uuids that have the key
allremotes <- filter (not . remoteAnnexIgnore . gitconfig)
<$> remoteList
let validremotes = remotesWithUUID allremotes validuuids
return (sortBy (comparing cost) validremotes, validtrusteduuids)
{- Displays known locations of a key. -}
showLocations :: Key -> [UUID] -> String -> Annex ()
showLocations key exclude nolocmsg = do
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u <- getUUID
uuids <- keyLocations key
untrusteduuids <- trustGet UnTrusted
let uuidswanted = filteruuids uuids (u:exclude++untrusteduuids)
let uuidsskipped = filteruuids uuids (u:exclude++uuidswanted)
ppuuidswanted <- Remote.prettyPrintUUIDs "wanted" uuidswanted
ppuuidsskipped <- Remote.prettyPrintUUIDs "skipped" uuidsskipped
showLongNote $ message ppuuidswanted ppuuidsskipped
ignored <- filter (remoteAnnexIgnore . gitconfig) <$> remoteList
unless (null ignored) $
showLongNote $ "(Note that these git remotes have annex-ignore set: " ++ unwords (map name ignored) ++ ")"
where
filteruuids l x = filter (`notElem` x) l
message [] [] = nolocmsg
message rs [] = "Try making some of these repositories available:\n" ++ rs
message [] us = "Also these untrusted repositories may contain the file:\n" ++ us
message rs us = message rs [] ++ message [] us
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showTriedRemotes :: [Remote] -> Annex ()
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showTriedRemotes [] = noop
showTriedRemotes remotes =
showLongNote $ "Unable to access these remotes: " ++
intercalate ", " (map name remotes)
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forceTrust :: TrustLevel -> String -> Annex ()
forceTrust level remotename = do
u <- nameToUUID remotename
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Annex.changeState $ \s ->
s { Annex.forcetrust = M.insert u level (Annex.forcetrust s) }
{- Used to log a change in a remote's having a key. The change is logged
- in the local repo, not on the remote. The process of transferring the
- key to the remote, or removing the key from it *may* log the change
- on the remote, but this cannot always be relied on. -}
logStatus :: Remote -> Key -> LogStatus -> Annex ()
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logStatus remote key = logChange key (uuid remote)
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{- Orders remotes by cost, with ones with the lowest cost grouped together. -}
byCost :: [Remote] -> [[Remote]]
byCost = map snd . sortBy (comparing fst) . M.toList . costmap
where
costmap = M.fromListWith (++) . map costpair
costpair r = (cost r, [r])