147 lines
4.7 KiB
Haskell
147 lines
4.7 KiB
Haskell
{- git-annex numcopies configuration and checking
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-
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- Copyright 2014-2015 Joey Hess <id@joeyh.name>
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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 Annex.NumCopies (
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module Types.NumCopies,
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module Logs.NumCopies,
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getFileNumCopies,
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getGlobalFileNumCopies,
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getNumCopies,
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deprecatedNumCopies,
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defaultNumCopies,
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numCopiesCheck,
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numCopiesCheck',
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verifyEnoughCopies,
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knownCopies,
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) where
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import Common.Annex
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import qualified Annex
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import Types.NumCopies
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import Logs.NumCopies
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import Logs.Trust
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import Annex.CheckAttr
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import qualified Remote
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import Annex.UUID
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import Annex.Content
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defaultNumCopies :: NumCopies
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defaultNumCopies = NumCopies 1
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fromSources :: [Annex (Maybe NumCopies)] -> Annex NumCopies
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fromSources = fromMaybe defaultNumCopies <$$> getM id
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{- The git config annex.numcopies is deprecated. -}
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deprecatedNumCopies :: Annex (Maybe NumCopies)
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deprecatedNumCopies = annexNumCopies <$> Annex.getGitConfig
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{- Value forced on the command line by --numcopies. -}
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getForcedNumCopies :: Annex (Maybe NumCopies)
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getForcedNumCopies = Annex.getState Annex.forcenumcopies
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{- Numcopies value from any of the non-.gitattributes configuration
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- sources. -}
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getNumCopies :: Annex NumCopies
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getNumCopies = fromSources
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[ getForcedNumCopies
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, getGlobalNumCopies
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, deprecatedNumCopies
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]
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{- Numcopies value for a file, from any configuration source, including the
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- deprecated git config. -}
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getFileNumCopies :: FilePath -> Annex NumCopies
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getFileNumCopies f = fromSources
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[ getForcedNumCopies
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, getFileNumCopies' f
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, deprecatedNumCopies
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]
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{- This is the globally visible numcopies value for a file. So it does
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- not include local configuration in the git config or command line
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- options. -}
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getGlobalFileNumCopies :: FilePath -> Annex NumCopies
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getGlobalFileNumCopies f = fromSources
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[ getFileNumCopies' f
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]
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getFileNumCopies' :: FilePath -> Annex (Maybe NumCopies)
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getFileNumCopies' file = maybe getGlobalNumCopies (return . Just) =<< getattr
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where
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getattr = (NumCopies <$$> readish)
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<$> checkAttr "annex.numcopies" file
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{- Checks if numcopies are satisfied for a file by running a comparison
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- between the number of (not untrusted) copies that are
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- belived to exist, and the configured value. -}
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numCopiesCheck :: FilePath -> Key -> (Int -> Int -> v) -> Annex v
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numCopiesCheck file key vs = do
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have <- trustExclude UnTrusted =<< Remote.keyLocations key
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numCopiesCheck' file vs have
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numCopiesCheck' :: FilePath -> (Int -> Int -> v) -> [UUID] -> Annex v
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numCopiesCheck' file vs have = do
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NumCopies needed <- getFileNumCopies file
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return $ length have `vs` needed
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{- Verifies that enough copies of a key exist amoung the listed remotes,
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- priting an informative message if not.
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-}
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verifyEnoughCopies
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:: String -- message to print when there are no known locations
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-> Key
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-> NumCopies
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-> [UUID] -- repos to skip (generally untrusted remotes)
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-> [UUID] -- repos that are trusted or already verified to have it
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-> [Remote] -- remotes to check to see if they have it
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-> Annex Bool
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verifyEnoughCopies nolocmsg key need skip trusted tocheck =
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helper [] [] (nub trusted) (nub tocheck)
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where
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helper bad missing have []
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| NumCopies (length have) >= need = return True
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| otherwise = do
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notEnoughCopies key need have (skip++missing) bad nolocmsg
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return False
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helper bad missing have (r:rs)
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| NumCopies (length have) >= need = return True
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| otherwise = do
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let u = Remote.uuid r
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let duplicate = u `elem` have
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haskey <- Remote.hasKey r key
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case (duplicate, haskey) of
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(False, Right True) -> helper bad missing (u:have) rs
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(False, Left _) -> helper (r:bad) missing have rs
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(False, Right False) -> helper bad (u:missing) have rs
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_ -> helper bad missing have rs
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notEnoughCopies :: Key -> NumCopies -> [UUID] -> [UUID] -> [Remote] -> String -> Annex ()
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notEnoughCopies key need have skip bad nolocmsg = do
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showNote "unsafe"
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showLongNote $
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"Could only verify the existence of " ++
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show (length have) ++ " out of " ++ show (fromNumCopies need) ++
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" necessary copies"
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Remote.showTriedRemotes bad
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Remote.showLocations True key (have++skip) nolocmsg
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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). If the current repository
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- currently has the key, and is not untrusted, it is included in this list.
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-}
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knownCopies :: Key -> Annex ([Remote], [UUID])
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knownCopies key = do
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(remotes, trusteduuids) <- Remote.keyPossibilitiesTrusted key
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u <- getUUID
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trusteduuids' <- ifM (inAnnex key <&&> (<= SemiTrusted) <$> lookupTrust u)
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( pure (u:trusteduuids)
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, pure trusteduuids
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)
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return (remotes, trusteduuids')
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