367 lines
12 KiB
Haskell
367 lines
12 KiB
Haskell
{- git-annex command
|
|
-
|
|
- Copyright 2010-2012 Joey Hess <joey@kitenet.net>
|
|
-
|
|
- Licensed under the GNU GPL version 3 or higher.
|
|
-}
|
|
|
|
{-# LANGUAGE BangPatterns #-}
|
|
|
|
module Command.Unused where
|
|
|
|
import qualified Data.Set as S
|
|
import qualified Data.ByteString.Lazy as L
|
|
import Data.BloomFilter
|
|
import Data.BloomFilter.Easy
|
|
import Data.BloomFilter.Hash
|
|
import Control.Monad.ST
|
|
import qualified Data.Map as M
|
|
|
|
import Common.Annex
|
|
import Command
|
|
import Logs.Unused
|
|
import Annex.Content
|
|
import Logs.Location
|
|
import Logs.Transfer
|
|
import qualified Annex
|
|
import qualified Git
|
|
import qualified Git.Command
|
|
import qualified Git.Ref
|
|
import qualified Git.Branch
|
|
import qualified Git.LsFiles as LsFiles
|
|
import qualified Git.DiffTree as DiffTree
|
|
import qualified Backend
|
|
import qualified Remote
|
|
import qualified Annex.Branch
|
|
import qualified Option
|
|
import Annex.CatFile
|
|
import Types.Key
|
|
import Git.FilePath
|
|
|
|
def :: [Command]
|
|
def = [withOptions [fromOption] $ command "unused" paramNothing seek
|
|
SectionMaintenance "look for unused file content"]
|
|
|
|
fromOption :: Option
|
|
fromOption = Option.field ['f'] "from" paramRemote "remote to check for unused content"
|
|
|
|
seek :: [CommandSeek]
|
|
seek = [withNothing start]
|
|
|
|
{- Finds unused content in the annex. -}
|
|
start :: CommandStart
|
|
start = do
|
|
from <- Annex.getField $ Option.name fromOption
|
|
let (name, action) = case from of
|
|
Nothing -> (".", checkUnused)
|
|
Just "." -> (".", checkUnused)
|
|
Just "here" -> (".", checkUnused)
|
|
Just n -> (n, checkRemoteUnused n)
|
|
showStart "unused" name
|
|
next action
|
|
|
|
checkUnused :: CommandPerform
|
|
checkUnused = chain 0
|
|
[ check "" unusedMsg $ findunused =<< Annex.getState Annex.fast
|
|
, check "bad" staleBadMsg $ staleKeysPrune gitAnnexBadDir False
|
|
, check "tmp" staleTmpMsg $ staleKeysPrune gitAnnexTmpDir True
|
|
]
|
|
where
|
|
findunused True = do
|
|
showNote "fast mode enabled; only finding stale files"
|
|
return []
|
|
findunused False = do
|
|
showAction "checking for unused data"
|
|
excludeReferenced =<< getKeysPresent
|
|
chain _ [] = next $ return True
|
|
chain v (a:as) = do
|
|
v' <- a v
|
|
chain v' as
|
|
|
|
checkRemoteUnused :: String -> CommandPerform
|
|
checkRemoteUnused name = go =<< fromJust <$> Remote.byNameWithUUID (Just name)
|
|
where
|
|
go r = do
|
|
showAction "checking for unused data"
|
|
_ <- check "" (remoteUnusedMsg r) (remoteunused r) 0
|
|
next $ return True
|
|
remoteunused r = excludeReferenced <=< loggedKeysFor $ Remote.uuid r
|
|
|
|
check :: FilePath -> ([(Int, Key)] -> String) -> Annex [Key] -> Int -> Annex Int
|
|
check file msg a c = do
|
|
l <- a
|
|
let unusedlist = number c l
|
|
unless (null l) $ showLongNote $ msg unusedlist
|
|
writeUnusedLog file unusedlist
|
|
return $ c + length l
|
|
|
|
number :: Int -> [a] -> [(Int, a)]
|
|
number _ [] = []
|
|
number n (x:xs) = (n+1, x) : number (n+1) xs
|
|
|
|
table :: [(Int, Key)] -> [String]
|
|
table l = " NUMBER KEY" : map cols l
|
|
where
|
|
cols (n,k) = " " ++ pad 6 (show n) ++ " " ++ key2file k
|
|
pad n s = s ++ replicate (n - length s) ' '
|
|
|
|
staleTmpMsg :: [(Int, Key)] -> String
|
|
staleTmpMsg t = unlines $
|
|
["Some partially transferred data exists in temporary files:"]
|
|
++ table t ++ [dropMsg Nothing]
|
|
|
|
staleBadMsg :: [(Int, Key)] -> String
|
|
staleBadMsg t = unlines $
|
|
["Some corrupted files have been preserved by fsck, just in case:"]
|
|
++ table t ++ [dropMsg Nothing]
|
|
|
|
unusedMsg :: [(Int, Key)] -> String
|
|
unusedMsg u = unusedMsg' u
|
|
["Some annexed data is no longer used by any files:"]
|
|
[dropMsg Nothing]
|
|
unusedMsg' :: [(Int, Key)] -> [String] -> [String] -> String
|
|
unusedMsg' u header trailer = unlines $
|
|
header ++
|
|
table u ++
|
|
["(To see where data was previously used, try: git log --stat -S'KEY')"] ++
|
|
trailer
|
|
|
|
remoteUnusedMsg :: Remote -> [(Int, Key)] -> String
|
|
remoteUnusedMsg r u = unusedMsg' u
|
|
["Some annexed data on " ++ name ++ " is not used by any files:"]
|
|
[dropMsg $ Just r]
|
|
where
|
|
name = Remote.name r
|
|
|
|
dropMsg :: Maybe Remote -> String
|
|
dropMsg Nothing = dropMsg' ""
|
|
dropMsg (Just r) = dropMsg' $ " --from " ++ Remote.name r
|
|
dropMsg' :: String -> String
|
|
dropMsg' s = "\nTo remove unwanted data: git-annex dropunused" ++ s ++ " NUMBER\n"
|
|
|
|
{- Finds keys in the list that are not referenced in the git repository.
|
|
-
|
|
- Strategy:
|
|
-
|
|
- * Build a bloom filter of all keys referenced by symlinks. This
|
|
- is the fastest one to build and will filter out most keys.
|
|
- * If keys remain, build a second bloom filter of keys referenced by
|
|
- all branches.
|
|
- * The list is streamed through these bloom filters lazily, so both will
|
|
- exist at the same time. This means that twice the memory is used,
|
|
- but they're relatively small, so the added complexity of using a
|
|
- mutable bloom filter does not seem worthwhile.
|
|
- * Generating the second bloom filter can take quite a while, since
|
|
- it needs enumerating all keys in all git branches. But, the common
|
|
- case, if the second filter is needed, is for some keys to be globally
|
|
- unused, and in that case, no short-circuit is possible.
|
|
- Short-circuiting if the first filter filters all the keys handles the
|
|
- other common case.
|
|
-}
|
|
excludeReferenced :: [Key] -> Annex [Key]
|
|
excludeReferenced ks = runfilter firstlevel ks >>= runfilter secondlevel
|
|
where
|
|
runfilter _ [] = return [] -- optimisation
|
|
runfilter a l = bloomFilter show l <$> genBloomFilter show a
|
|
firstlevel = withKeysReferencedM
|
|
secondlevel = withKeysReferencedInGit
|
|
|
|
{- Finds items in the first, smaller list, that are not
|
|
- present in the second, larger list.
|
|
-
|
|
- Constructing a single set, of the list that tends to be
|
|
- smaller, appears more efficient in both memory and CPU
|
|
- than constructing and taking the S.difference of two sets. -}
|
|
exclude :: Ord a => [a] -> [a] -> [a]
|
|
exclude [] _ = [] -- optimisation
|
|
exclude smaller larger = S.toList $ remove larger $ S.fromList smaller
|
|
where
|
|
remove a b = foldl (flip S.delete) b a
|
|
|
|
{- A bloom filter capable of holding half a million keys with a
|
|
- false positive rate of 1 in 1000 uses around 8 mb of memory,
|
|
- so will easily fit on even my lowest memory systems.
|
|
-}
|
|
bloomCapacity :: Annex Int
|
|
bloomCapacity = fromMaybe 500000 . annexBloomCapacity <$> Annex.getGitConfig
|
|
bloomAccuracy :: Annex Int
|
|
bloomAccuracy = fromMaybe 1000 . annexBloomAccuracy <$> Annex.getGitConfig
|
|
bloomBitsHashes :: Annex (Int, Int)
|
|
bloomBitsHashes = do
|
|
capacity <- bloomCapacity
|
|
accuracy <- bloomAccuracy
|
|
return $ suggestSizing capacity (1/ fromIntegral accuracy)
|
|
|
|
{- Creates a bloom filter, and runs an action, such as withKeysReferenced,
|
|
- to populate it.
|
|
-
|
|
- The action is passed a callback that it can use to feed values into the
|
|
- bloom filter.
|
|
-
|
|
- Once the action completes, the mutable filter is frozen
|
|
- for later use.
|
|
-}
|
|
genBloomFilter :: Hashable t => (v -> t) -> ((v -> Annex ()) -> Annex b) -> Annex (Bloom t)
|
|
genBloomFilter convert populate = do
|
|
(numbits, numhashes) <- bloomBitsHashes
|
|
bloom <- lift $ newMB (cheapHashes numhashes) numbits
|
|
_ <- populate $ \v -> lift $ insertMB bloom (convert v)
|
|
lift $ unsafeFreezeMB bloom
|
|
where
|
|
lift = liftIO . stToIO
|
|
|
|
bloomFilter :: Hashable t => (v -> t) -> [v] -> Bloom t -> [v]
|
|
bloomFilter convert l bloom = filter (\k -> convert k `notElemB` bloom) l
|
|
|
|
{- Given an initial value, folds it with each key referenced by
|
|
- symlinks in the git repo. -}
|
|
withKeysReferenced :: v -> (Key -> v -> v) -> Annex v
|
|
withKeysReferenced initial a = withKeysReferenced' Nothing initial folda
|
|
where
|
|
folda k _ v = return $ a k v
|
|
|
|
{- Runs an action on each referenced key in the git repo. -}
|
|
withKeysReferencedM :: (Key -> Annex ()) -> Annex ()
|
|
withKeysReferencedM a = withKeysReferenced' Nothing () calla
|
|
where
|
|
calla k _ _ = a k
|
|
|
|
{- Folds an action over keys and files referenced in a particular directory. -}
|
|
withKeysFilesReferencedIn :: FilePath -> v -> (Key -> FilePath -> v -> Annex v) -> Annex v
|
|
withKeysFilesReferencedIn = withKeysReferenced' . Just
|
|
|
|
withKeysReferenced' :: Maybe FilePath -> v -> (Key -> FilePath -> v -> Annex v) -> Annex v
|
|
withKeysReferenced' mdir initial a = do
|
|
(files, clean) <- getfiles
|
|
r <- go initial files
|
|
liftIO $ void clean
|
|
return r
|
|
where
|
|
getfiles = case mdir of
|
|
Nothing -> ifM isBareRepo
|
|
( return ([], return True)
|
|
, do
|
|
top <- fromRepo Git.repoPath
|
|
inRepo $ LsFiles.allFiles [top]
|
|
)
|
|
Just dir -> inRepo $ LsFiles.inRepo [dir]
|
|
go v [] = return v
|
|
go v (f:fs) = do
|
|
x <- Backend.lookupFile f
|
|
case x of
|
|
Nothing -> go v fs
|
|
Just (k, _) -> do
|
|
!v' <- a k f v
|
|
go v' fs
|
|
|
|
withKeysReferencedInGit :: (Key -> Annex ()) -> Annex ()
|
|
withKeysReferencedInGit a = do
|
|
current <- inRepo Git.Branch.currentUnsafe
|
|
shaHead <- maybe (return Nothing) (inRepo . Git.Ref.sha) current
|
|
showref >>= mapM_ (withKeysReferencedInGitRef a) .
|
|
relevantrefs (shaHead, current)
|
|
where
|
|
showref = inRepo $ Git.Command.pipeReadStrict [Param "show-ref"]
|
|
relevantrefs headRef = addHead headRef .
|
|
filter ourbranches .
|
|
map (separate (== ' ')) .
|
|
lines
|
|
nubRefs = map (Git.Ref . snd) . nubBy (\(x, _) (y, _) -> x == y)
|
|
ourbranchend = '/' : show Annex.Branch.name
|
|
ourbranches (_, b) = not (ourbranchend `isSuffixOf` b)
|
|
&& not ("refs/synced/" `isPrefixOf` b)
|
|
addHead headRef refs = case headRef of
|
|
-- if HEAD diverges from all branches (except the branch it
|
|
-- points to), run the actions on staged keys (and keys
|
|
-- that are only present in the work tree if the repo is
|
|
-- non bare)
|
|
(Just (Git.Ref x), Just (Git.Ref b))
|
|
| all (\(x',b') -> x /= x' || b == b') refs ->
|
|
Git.Ref.headRef
|
|
: nubRefs (filter ((/= x) . fst) refs)
|
|
_ -> nubRefs refs
|
|
|
|
{- Runs an action on keys referenced in the given Git reference which
|
|
- differ from those referenced in the index. -}
|
|
withKeysReferencedInGitRef :: (Key -> Annex ()) -> Git.Ref -> Annex ()
|
|
withKeysReferencedInGitRef a ref = do
|
|
showAction $ "checking " ++ Git.Ref.describe ref
|
|
bare <- isBareRepo
|
|
(ts,clean) <- inRepo $ if bare
|
|
then DiffTree.diffIndex ref
|
|
else DiffTree.diffWorkTree ref
|
|
let lookAtWorkingTree = not bare && ref == Git.Ref.headRef
|
|
forM_ ts $ tKey lookAtWorkingTree >=> maybe noop a
|
|
liftIO $ void clean
|
|
where
|
|
tKey True = fmap fst <$$> Backend.lookupFile . getTopFilePath . DiffTree.file
|
|
tKey False = fileKey . takeFileName . encodeW8 . L.unpack <$$>
|
|
catFile ref . getTopFilePath . DiffTree.file
|
|
|
|
{- Looks in the specified directory for bad/tmp keys, and returns a list
|
|
- of those that might still have value, or might be stale and removable.
|
|
-
|
|
- Also, stale keys that can be proven to have no value are deleted.
|
|
-}
|
|
staleKeysPrune :: (Git.Repo -> FilePath) -> Bool -> Annex [Key]
|
|
staleKeysPrune dirspec nottransferred = do
|
|
contents <- dirKeys dirspec
|
|
|
|
dups <- filterM inAnnex contents
|
|
let stale = contents `exclude` dups
|
|
|
|
dir <- fromRepo dirspec
|
|
liftIO $ forM_ dups $ \t -> removeFile $ dir </> keyFile t
|
|
|
|
if nottransferred
|
|
then do
|
|
inprogress <- S.fromList . map (transferKey . fst)
|
|
<$> getTransfers
|
|
return $ filter (`S.notMember` inprogress) stale
|
|
else return stale
|
|
|
|
data UnusedMaps = UnusedMaps
|
|
{ unusedMap :: UnusedMap
|
|
, unusedBadMap :: UnusedMap
|
|
, unusedTmpMap :: UnusedMap
|
|
}
|
|
|
|
{- Read unused logs once, and pass the maps to each start action. -}
|
|
withUnusedMaps :: (UnusedMaps -> Int -> CommandStart) -> CommandSeek
|
|
withUnusedMaps a params = do
|
|
unused <- readUnusedLog ""
|
|
unusedbad <- readUnusedLog "bad"
|
|
unusedtmp <- readUnusedLog "tmp"
|
|
return $ map (a $ UnusedMaps unused unusedbad unusedtmp) $
|
|
concatMap unusedSpec params
|
|
|
|
unusedSpec :: String -> [Int]
|
|
unusedSpec spec
|
|
| "-" `isInfixOf` spec = range $ separate (== '-') spec
|
|
| otherwise = maybe badspec (: []) (readish spec)
|
|
where
|
|
range (a, b) = case (readish a, readish b) of
|
|
(Just x, Just y) -> [x..y]
|
|
_ -> badspec
|
|
badspec = error $ "Expected number or range, not \"" ++ spec ++ "\""
|
|
|
|
{- Start action for unused content. Finds the number in the maps, and
|
|
- calls either of 3 actions, depending on the type of unused file. -}
|
|
startUnused :: String
|
|
-> (Key -> CommandPerform)
|
|
-> (Key -> CommandPerform)
|
|
-> (Key -> CommandPerform)
|
|
-> UnusedMaps -> Int -> CommandStart
|
|
startUnused message unused badunused tmpunused maps n = search
|
|
[ (unusedMap maps, unused)
|
|
, (unusedBadMap maps, badunused)
|
|
, (unusedTmpMap maps, tmpunused)
|
|
]
|
|
where
|
|
search [] = error $ show n ++ " not valid (run git annex unused for list)"
|
|
search ((m, a):rest) =
|
|
case M.lookup n m of
|
|
Nothing -> search rest
|
|
Just key -> do
|
|
showStart message (show n)
|
|
next $ a key
|