239 lines
7.4 KiB
Haskell
239 lines
7.4 KiB
Haskell
{- git-annex command
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-
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- Copyright 2010-2011 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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{-# LANGUAGE BangPatterns #-}
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module Command.Unused where
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import qualified Data.Set as S
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import qualified Data.ByteString.Lazy.Char8 as L
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import Common.Annex
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import Command
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import Annex.Content
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import Utility.FileMode
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import Utility.TempFile
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import Logs.Location
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import qualified Annex
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import qualified Git
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import qualified Git.Command
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import qualified Git.Ref
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import qualified Git.LsFiles as LsFiles
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import qualified Git.LsTree as LsTree
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import qualified Backend
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import qualified Remote
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import qualified Annex.Branch
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import qualified Option
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import Annex.CatFile
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def :: [Command]
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def = [withOptions [fromOption] $ command "unused" paramNothing seek
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"look for unused file content"]
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fromOption :: Option
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fromOption = Option.field ['f'] "from" paramRemote "remote to check for unused content"
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seek :: [CommandSeek]
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seek = [withNothing $ start]
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{- Finds unused content in the annex. -}
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start :: CommandStart
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start = do
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from <- Annex.getField $ Option.name fromOption
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let (name, action) = case from of
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Nothing -> (".", checkUnused)
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Just "." -> (".", checkUnused)
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Just n -> (n, checkRemoteUnused n)
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showStart "unused" name
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next action
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checkUnused :: CommandPerform
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checkUnused = do
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(unused, stalebad, staletmp) <- unusedKeys
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_ <- list "" unusedMsg unused 0 >>=
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list "bad" staleBadMsg stalebad >>=
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list "tmp" staleTmpMsg staletmp
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next $ return True
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where
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list file msg l c = do
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let unusedlist = number c l
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unless (null l) $ showLongNote $ msg unusedlist
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writeUnusedFile file unusedlist
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return $ c + length l
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checkRemoteUnused :: String -> CommandPerform
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checkRemoteUnused name = do
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checkRemoteUnused' =<< fromJust <$> Remote.byName (Just name)
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next $ return True
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checkRemoteUnused' :: Remote -> Annex ()
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checkRemoteUnused' r = do
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showAction "checking for unused data"
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remotehas <- loggedKeysFor (Remote.uuid r)
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remoteunused <- excludeReferenced remotehas
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let list = number 0 remoteunused
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writeUnusedFile "" list
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unless (null remoteunused) $ showLongNote $ remoteUnusedMsg r list
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writeUnusedFile :: FilePath -> [(Int, Key)] -> Annex ()
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writeUnusedFile prefix l = do
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logfile <- fromRepo $ gitAnnexUnusedLog prefix
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liftIO $ viaTmp writeFile logfile $
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unlines $ map (\(n, k) -> show n ++ " " ++ show k) l
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table :: [(Int, Key)] -> [String]
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table l = " NUMBER KEY" : map cols l
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where
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cols (n,k) = " " ++ pad 6 (show n) ++ " " ++ show k
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pad n s = s ++ replicate (n - length s) ' '
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number :: Int -> [a] -> [(Int, a)]
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number _ [] = []
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number n (x:xs) = (n+1, x) : number (n+1) xs
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staleTmpMsg :: [(Int, Key)] -> String
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staleTmpMsg t = unlines $
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["Some partially transferred data exists in temporary files:"]
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++ table t ++ [dropMsg Nothing]
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staleBadMsg :: [(Int, Key)] -> String
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staleBadMsg t = unlines $
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["Some corrupted files have been preserved by fsck, just in case:"]
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++ table t ++ [dropMsg Nothing]
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unusedMsg :: [(Int, Key)] -> String
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unusedMsg u = unusedMsg' u
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["Some annexed data is no longer used by any files:"]
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[dropMsg Nothing]
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unusedMsg' :: [(Int, Key)] -> [String] -> [String] -> String
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unusedMsg' u header trailer = unlines $
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header ++
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table u ++
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["(To see where data was previously used, try: git log --stat -S'KEY')"] ++
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trailer
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remoteUnusedMsg :: Remote -> [(Int, Key)] -> String
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remoteUnusedMsg r u = unusedMsg' u
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["Some annexed data on " ++ name ++ " is not used by any files:"]
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[dropMsg $ Just r]
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where
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name = Remote.name r
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dropMsg :: Maybe Remote -> String
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dropMsg Nothing = dropMsg' ""
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dropMsg (Just r) = dropMsg' $ " --from " ++ Remote.name r
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dropMsg' :: String -> String
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dropMsg' s = "\nTo remove unwanted data: git-annex dropunused" ++ s ++ " NUMBER\n"
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{- Finds keys whose content is present, but that do not seem to be used
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- by any files in the git repo, or that are only present as bad or tmp
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- files. -}
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unusedKeys :: Annex ([Key], [Key], [Key])
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unusedKeys = do
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fast <- Annex.getState Annex.fast
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if fast
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then do
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showNote "fast mode enabled; only finding stale files"
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tmp <- staleKeys gitAnnexTmpDir
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bad <- staleKeys gitAnnexBadDir
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return ([], bad, tmp)
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else do
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showAction "checking for unused data"
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present <- getKeysPresent
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unused <- excludeReferenced present
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staletmp <- staleKeysPrune gitAnnexTmpDir present
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stalebad <- staleKeysPrune gitAnnexBadDir present
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return (unused, stalebad, staletmp)
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{- Finds keys in the list that are not referenced in the git repository. -}
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excludeReferenced :: [Key] -> Annex [Key]
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excludeReferenced [] = return [] -- optimisation
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excludeReferenced l = do
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c <- inRepo $ Git.Command.pipeRead [Param "show-ref"]
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removewith (getKeysReferenced : map getKeysReferencedInGit (refs c))
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(S.fromList l)
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where
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-- Skip the git-annex branches, and get all other unique refs.
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refs = map (Git.Ref . snd) .
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nubBy uniqref .
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filter ourbranches .
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map (separate (== ' ')) . lines . L.unpack
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uniqref (a, _) (b, _) = a == b
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ourbranchend = '/' : show Annex.Branch.name
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ourbranches (_, b) = not $ ourbranchend `isSuffixOf` b
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removewith [] s = return $ S.toList s
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removewith (a:as) s
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| s == S.empty = return [] -- optimisation
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| otherwise = do
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referenced <- a
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let !s' = s `S.difference` S.fromList referenced
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removewith as s'
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{- Finds items in the first, smaller list, that are not
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- present in the second, larger list.
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-
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- Constructing a single set, of the list that tends to be
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- smaller, appears more efficient in both memory and CPU
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- than constructing and taking the S.difference of two sets. -}
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exclude :: Ord a => [a] -> [a] -> [a]
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exclude [] _ = [] -- optimisation
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exclude smaller larger = S.toList $ remove larger $ S.fromList smaller
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where
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remove a b = foldl (flip S.delete) b a
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{- List of keys referenced by symlinks in the git repo. -}
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getKeysReferenced :: Annex [Key]
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getKeysReferenced = do
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top <- fromRepo Git.workTree
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files <- inRepo $ LsFiles.inRepo [top]
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keypairs <- mapM Backend.lookupFile files
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return $ map fst $ catMaybes keypairs
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{- List of keys referenced by symlinks in a git ref. -}
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getKeysReferencedInGit :: Git.Ref -> Annex [Key]
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getKeysReferencedInGit ref = do
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showAction $ "checking " ++ Git.Ref.describe ref
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findkeys [] =<< inRepo (LsTree.lsTree ref)
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where
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findkeys c [] = return c
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findkeys c (l:ls)
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| isSymLink (LsTree.mode l) = do
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content <- catFile ref $ LsTree.file l
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case fileKey (takeFileName $ L.unpack content) of
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Nothing -> findkeys c ls
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Just k -> findkeys (k:c) ls
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| otherwise = findkeys c ls
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{- Looks in the specified directory for bad/tmp keys, and returns a list
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- of those that might still have value, or might be stale and removable.
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-
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- When a list of presently available keys is provided, stale keys
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- that no longer have value are deleted.
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-}
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staleKeysPrune :: (Git.Repo -> FilePath) -> [Key] -> Annex [Key]
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staleKeysPrune dirspec present = do
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contents <- staleKeys dirspec
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let stale = contents `exclude` present
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let dups = contents `exclude` stale
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dir <- fromRepo dirspec
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liftIO $ forM_ dups $ \t -> removeFile $ dir </> keyFile t
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return stale
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staleKeys :: (Git.Repo -> FilePath) -> Annex [Key]
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staleKeys dirspec = do
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dir <- fromRepo dirspec
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exists <- liftIO $ doesDirectoryExist dir
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if not exists
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then return []
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else do
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contents <- liftIO $ getDirectoryContents dir
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files <- liftIO $ filterM doesFileExist $
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map (dir </>) contents
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return $ mapMaybe (fileKey . takeFileName) files
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