723 lines
24 KiB
Haskell
723 lines
24 KiB
Haskell
{- git-annex file content managing
|
|
-
|
|
- Copyright 2010-2020 Joey Hess <id@joeyh.name>
|
|
-
|
|
- Licensed under the GNU AGPL version 3 or higher.
|
|
-}
|
|
|
|
{-# LANGUAGE CPP #-}
|
|
|
|
module Annex.Content (
|
|
inAnnex,
|
|
inAnnex',
|
|
inAnnexSafe,
|
|
inAnnexCheck,
|
|
objectFileExists,
|
|
lockContentShared,
|
|
lockContentForRemoval,
|
|
ContentRemovalLock,
|
|
RetrievalSecurityPolicy(..),
|
|
getViaTmp,
|
|
getViaTmpFromDisk,
|
|
checkDiskSpaceToGet,
|
|
checkSecureHashes,
|
|
prepTmp,
|
|
withTmp,
|
|
checkDiskSpace,
|
|
needMoreDiskSpace,
|
|
moveAnnex,
|
|
populatePointerFile,
|
|
linkToAnnex,
|
|
linkFromAnnex,
|
|
LinkAnnexResult(..),
|
|
unlinkAnnex,
|
|
checkedCopyFile,
|
|
linkOrCopy,
|
|
linkOrCopy',
|
|
sendAnnex,
|
|
prepSendAnnex,
|
|
removeAnnex,
|
|
moveBad,
|
|
KeyLocation(..),
|
|
listKeys,
|
|
saveState,
|
|
downloadUrl,
|
|
preseedTmp,
|
|
dirKeys,
|
|
withObjectLoc,
|
|
staleKeysPrune,
|
|
pruneTmpWorkDirBefore,
|
|
isUnmodified,
|
|
isUnmodifiedCheap,
|
|
verifyKeyContent,
|
|
VerifyConfig(..),
|
|
Verification(..),
|
|
unVerified,
|
|
withTmpWorkDir,
|
|
) where
|
|
|
|
import System.IO.Unsafe (unsafeInterleaveIO)
|
|
import qualified Data.Set as S
|
|
|
|
import Annex.Common
|
|
import Annex.Content.Presence
|
|
import Annex.Content.LowLevel
|
|
import Annex.Content.PointerFile
|
|
import qualified Git
|
|
import qualified Annex
|
|
import qualified Annex.Queue
|
|
import qualified Annex.Branch
|
|
import qualified Annex.Url as Url
|
|
import qualified Backend
|
|
import qualified Database.Keys
|
|
import Git.FilePath
|
|
import Annex.Perms
|
|
import Annex.Link
|
|
import Annex.LockPool
|
|
import Annex.UUID
|
|
import Annex.InodeSentinal
|
|
import Annex.AdjustedBranch (adjustedBranchRefresh)
|
|
import Messages.Progress
|
|
import Types.Remote (RetrievalSecurityPolicy(..))
|
|
import Types.NumCopies
|
|
import Types.Key
|
|
import Types.Transfer
|
|
import Logs.Transfer
|
|
import Logs.Location
|
|
import Utility.InodeCache
|
|
import Utility.CopyFile
|
|
import Utility.Metered
|
|
import qualified Utility.RawFilePath as R
|
|
|
|
import qualified System.FilePath.ByteString as P
|
|
|
|
{- Prevents the content from being removed while the action is running.
|
|
- Uses a shared lock.
|
|
-
|
|
- If locking fails, or the content is not present, throws an exception
|
|
- rather than running the action.
|
|
-}
|
|
lockContentShared :: Key -> (VerifiedCopy -> Annex a) -> Annex a
|
|
lockContentShared key a = lockContentUsing lock key notpresent $
|
|
ifM (inAnnex key)
|
|
( do
|
|
u <- getUUID
|
|
withVerifiedCopy LockedCopy u (return True) a
|
|
, notpresent
|
|
)
|
|
where
|
|
notpresent = giveup $ "failed to lock content: not present"
|
|
#ifndef mingw32_HOST_OS
|
|
lock contentfile Nothing = tryLockShared Nothing contentfile
|
|
lock _ (Just lockfile) = posixLocker tryLockShared lockfile
|
|
#else
|
|
lock = winLocker lockShared
|
|
#endif
|
|
|
|
{- Exclusively locks content, while performing an action that
|
|
- might remove it.
|
|
-
|
|
- If locking fails, throws an exception rather than running the action.
|
|
-
|
|
- But, if locking fails because the the content is not present, runs the
|
|
- fallback action instead.
|
|
-}
|
|
lockContentForRemoval :: Key -> Annex a -> (ContentRemovalLock -> Annex a) -> Annex a
|
|
lockContentForRemoval key fallback a = lockContentUsing lock key fallback $
|
|
a (ContentRemovalLock key)
|
|
where
|
|
#ifndef mingw32_HOST_OS
|
|
{- Since content files are stored with the write bit disabled, have
|
|
- to fiddle with permissions to open for an exclusive lock. -}
|
|
lock contentfile Nothing = bracket_
|
|
(thawContent contentfile)
|
|
(freezeContent contentfile)
|
|
(tryLockExclusive Nothing contentfile)
|
|
lock _ (Just lockfile) = posixLocker tryLockExclusive lockfile
|
|
#else
|
|
lock = winLocker lockExclusive
|
|
#endif
|
|
|
|
{- Passed the object content file, and maybe a separate lock file to use,
|
|
- when the content file itself should not be locked. -}
|
|
type ContentLocker = RawFilePath -> Maybe LockFile -> Annex (Maybe LockHandle)
|
|
|
|
#ifndef mingw32_HOST_OS
|
|
posixLocker :: (Maybe FileMode -> LockFile -> Annex (Maybe LockHandle)) -> LockFile -> Annex (Maybe LockHandle)
|
|
posixLocker takelock lockfile = do
|
|
mode <- annexFileMode
|
|
modifyContent lockfile $
|
|
takelock (Just mode) lockfile
|
|
|
|
#else
|
|
winLocker :: (LockFile -> IO (Maybe LockHandle)) -> ContentLocker
|
|
winLocker takelock _ (Just lockfile) = do
|
|
modifyContent lockfile $
|
|
void $ liftIO $ tryIO $
|
|
writeFile (fromRawFilePath lockfile) ""
|
|
liftIO $ takelock lockfile
|
|
-- never reached; windows always uses a separate lock file
|
|
winLocker _ _ Nothing = return Nothing
|
|
#endif
|
|
|
|
{- The fallback action is run if the ContentLocker throws an IO exception
|
|
- and the content is not present. It's not guaranteed to always run when
|
|
- the content is not present, because the content file is not always
|
|
- the file that is locked eg on Windows a different file is locked. -}
|
|
lockContentUsing :: ContentLocker -> Key -> Annex a -> Annex a -> Annex a
|
|
lockContentUsing locker key fallback a = do
|
|
contentfile <- calcRepo (gitAnnexLocation key)
|
|
lockfile <- contentLockFile key
|
|
bracket
|
|
(lock contentfile lockfile)
|
|
(either (const noop) (unlock lockfile))
|
|
go
|
|
where
|
|
alreadylocked = giveup "content is locked"
|
|
failedtolock e = giveup $ "failed to lock content: " ++ show e
|
|
|
|
lock contentfile lockfile = tryIO $
|
|
maybe alreadylocked return
|
|
=<< locker contentfile lockfile
|
|
|
|
go (Right _) = a
|
|
go (Left e) = ifM (inAnnex key)
|
|
( failedtolock e
|
|
, fallback
|
|
)
|
|
|
|
#ifndef mingw32_HOST_OS
|
|
unlock mlockfile lck = do
|
|
maybe noop cleanuplockfile mlockfile
|
|
liftIO $ dropLock lck
|
|
#else
|
|
unlock mlockfile lck = do
|
|
-- Can't delete a locked file on Windows
|
|
liftIO $ dropLock lck
|
|
maybe noop cleanuplockfile mlockfile
|
|
#endif
|
|
|
|
cleanuplockfile lockfile = modifyContent lockfile $
|
|
void $ liftIO $ tryIO $
|
|
removeWhenExistsWith R.removeLink lockfile
|
|
|
|
{- Runs an action, passing it the temp file to get,
|
|
- and if the action succeeds, verifies the file matches
|
|
- the key and moves the file into the annex as a key's content. -}
|
|
getViaTmp :: RetrievalSecurityPolicy -> VerifyConfig -> Key -> AssociatedFile -> (RawFilePath -> Annex (Bool, Verification)) -> Annex Bool
|
|
getViaTmp rsp v key af action = checkDiskSpaceToGet key False $
|
|
getViaTmpFromDisk rsp v key af action
|
|
|
|
{- Like getViaTmp, but does not check that there is enough disk space
|
|
- for the incoming key. For use when the key content is already on disk
|
|
- and not being copied into place. -}
|
|
getViaTmpFromDisk :: RetrievalSecurityPolicy -> VerifyConfig -> Key -> AssociatedFile -> (RawFilePath -> Annex (Bool, Verification)) -> Annex Bool
|
|
getViaTmpFromDisk rsp v key af action = checkallowed $ do
|
|
tmpfile <- prepTmp key
|
|
resuming <- liftIO $ R.doesPathExist tmpfile
|
|
(ok, verification) <- action tmpfile
|
|
-- When the temp file already had content, we don't know if
|
|
-- that content is good or not, so only trust if it the action
|
|
-- Verified it in passing. Otherwise, force verification even
|
|
-- if the VerifyConfig normally disables it.
|
|
let verification' = if resuming
|
|
then case verification of
|
|
Verified -> Verified
|
|
_ -> MustVerify
|
|
else verification
|
|
if ok
|
|
then ifM (verifyKeyContent rsp v verification' key tmpfile)
|
|
( ifM (pruneTmpWorkDirBefore tmpfile (moveAnnex key af))
|
|
( do
|
|
logStatus key InfoPresent
|
|
return True
|
|
, return False
|
|
)
|
|
, do
|
|
warning "verification of content failed"
|
|
-- The bad content is not retained, because
|
|
-- a retry should not try to resume from it
|
|
-- since it's apparently corrupted.
|
|
-- Also, the bad content could be any data,
|
|
-- including perhaps the content of another
|
|
-- file than the one that was requested,
|
|
-- and so it's best not to keep it on disk.
|
|
pruneTmpWorkDirBefore tmpfile
|
|
(liftIO . removeWhenExistsWith R.removeLink)
|
|
return False
|
|
)
|
|
-- On transfer failure, the tmp file is left behind, in case
|
|
-- caller wants to resume its transfer
|
|
else return False
|
|
where
|
|
-- Avoid running the action to get the content when the
|
|
-- RetrievalSecurityPolicy would cause verification to always fail.
|
|
checkallowed a = case rsp of
|
|
RetrievalAllKeysSecure -> a
|
|
RetrievalVerifiableKeysSecure -> ifM (Backend.isVerifiable key)
|
|
( a
|
|
, ifM (annexAllowUnverifiedDownloads <$> Annex.getGitConfig)
|
|
( a
|
|
, warnUnverifiableInsecure key >> return False
|
|
)
|
|
)
|
|
|
|
{- Checks if there is enough free disk space to download a key
|
|
- to its temp file.
|
|
-
|
|
- When the temp file already exists, count the space it is using as
|
|
- free, since the download will overwrite it or resume.
|
|
-
|
|
- Wen there's enough free space, runs the download action.
|
|
-}
|
|
checkDiskSpaceToGet :: Key -> a -> Annex a -> Annex a
|
|
checkDiskSpaceToGet key unabletoget getkey = do
|
|
tmp <- fromRepo (gitAnnexTmpObjectLocation key)
|
|
e <- liftIO $ doesFileExist (fromRawFilePath tmp)
|
|
alreadythere <- liftIO $ if e
|
|
then getFileSize tmp
|
|
else return 0
|
|
ifM (checkDiskSpace Nothing key alreadythere True)
|
|
( do
|
|
-- The tmp file may not have been left writable
|
|
when e $ thawContent tmp
|
|
getkey
|
|
, return unabletoget
|
|
)
|
|
|
|
prepTmp :: Key -> Annex RawFilePath
|
|
prepTmp key = do
|
|
tmp <- fromRepo $ gitAnnexTmpObjectLocation key
|
|
createAnnexDirectory (parentDir tmp)
|
|
return tmp
|
|
|
|
{- Prepares a temp file for a key, runs an action on it, and cleans up
|
|
- the temp file. If the action throws an exception, the temp file is
|
|
- left behind, which allows for resuming.
|
|
-}
|
|
withTmp :: Key -> (RawFilePath -> Annex a) -> Annex a
|
|
withTmp key action = do
|
|
tmp <- prepTmp key
|
|
res <- action tmp
|
|
pruneTmpWorkDirBefore tmp (liftIO . removeWhenExistsWith R.removeLink)
|
|
return res
|
|
|
|
{- Moves a key's content into .git/annex/objects/
|
|
-
|
|
- When a key has associated pointer files, the object is hard
|
|
- linked (or copied) to the files, and the object file is left thawed.
|
|
-
|
|
- What if the key there already has content? This could happen for
|
|
- various reasons; perhaps the same content is being annexed again.
|
|
- Perhaps there has been a hash collision generating the keys.
|
|
-
|
|
- The current strategy is to assume that in this case it's safe to delete
|
|
- one of the two copies of the content; and the one already in the annex
|
|
- is left there, assuming it's the original, canonical copy.
|
|
-
|
|
- I considered being more paranoid, and checking that both files had
|
|
- the same content. Decided against it because A) users explicitly choose
|
|
- a backend based on its hashing properties and so if they're dealing
|
|
- with colliding files it's their own fault and B) adding such a check
|
|
- would not catch all cases of colliding keys. For example, perhaps
|
|
- a remote has a key; if it's then added again with different content then
|
|
- the overall system now has two different peices of content for that
|
|
- key, and one of them will probably get deleted later. So, adding the
|
|
- check here would only raise expectations that git-annex cannot truely
|
|
- meet.
|
|
-
|
|
- May return false, when a particular variety of key is not being
|
|
- accepted into the repository. Will display a warning message in this
|
|
- case. May also throw exceptions in some cases.
|
|
-}
|
|
moveAnnex :: Key -> AssociatedFile -> RawFilePath -> Annex Bool
|
|
moveAnnex key af src = ifM (checkSecureHashes' key)
|
|
( do
|
|
withObjectLoc key storeobject
|
|
return True
|
|
, return False
|
|
)
|
|
where
|
|
storeobject dest = ifM (liftIO $ R.doesPathExist dest)
|
|
( alreadyhave
|
|
, adjustedBranchRefresh af $ modifyContent dest $ do
|
|
freezeContent src
|
|
liftIO $ moveFile
|
|
(fromRawFilePath src)
|
|
(fromRawFilePath dest)
|
|
g <- Annex.gitRepo
|
|
fs <- map (`fromTopFilePath` g)
|
|
<$> Database.Keys.getAssociatedFiles key
|
|
unless (null fs) $ do
|
|
ics <- mapM (populatePointerFile (Restage True) key dest) fs
|
|
Database.Keys.storeInodeCaches' key [dest] (catMaybes ics)
|
|
)
|
|
alreadyhave = liftIO $ R.removeLink src
|
|
|
|
checkSecureHashes :: Key -> Annex (Maybe String)
|
|
checkSecureHashes key = ifM (Backend.isCryptographicallySecure key)
|
|
( return Nothing
|
|
, ifM (annexSecureHashesOnly <$> Annex.getGitConfig)
|
|
( return $ Just $ "annex.securehashesonly blocked adding " ++ decodeBS (formatKeyVariety (fromKey keyVariety key)) ++ " key"
|
|
, return Nothing
|
|
)
|
|
)
|
|
|
|
checkSecureHashes' :: Key -> Annex Bool
|
|
checkSecureHashes' key = checkSecureHashes key >>= \case
|
|
Nothing -> return True
|
|
Just msg -> do
|
|
warning $ msg ++ "to annex objects"
|
|
return False
|
|
|
|
data LinkAnnexResult = LinkAnnexOk | LinkAnnexFailed | LinkAnnexNoop
|
|
|
|
{- Populates the annex object file by hard linking or copying a source
|
|
- file to it. -}
|
|
linkToAnnex :: Key -> RawFilePath -> Maybe InodeCache -> Annex LinkAnnexResult
|
|
linkToAnnex key src srcic = ifM (checkSecureHashes' key)
|
|
( do
|
|
dest <- calcRepo (gitAnnexLocation key)
|
|
modifyContent dest $ linkAnnex To key src srcic dest Nothing
|
|
, return LinkAnnexFailed
|
|
)
|
|
|
|
{- Makes a destination file be a link or copy from the annex object. -}
|
|
linkFromAnnex :: Key -> RawFilePath -> Maybe FileMode -> Annex LinkAnnexResult
|
|
linkFromAnnex key dest destmode = do
|
|
src <- calcRepo (gitAnnexLocation key)
|
|
srcic <- withTSDelta (liftIO . genInodeCache src)
|
|
linkAnnex From key src srcic dest destmode
|
|
|
|
data FromTo = From | To
|
|
|
|
{- Hard links or copies from or to the annex object location.
|
|
- Updates inode cache.
|
|
-
|
|
- Freezes or thaws the destination appropriately.
|
|
-
|
|
- When a hard link is made, the annex object necessarily has to be thawed
|
|
- too. So, adding an object to the annex with a hard link can prevent
|
|
- losing the content if the source file is deleted, but does not
|
|
- guard against modifications.
|
|
-
|
|
- Nothing is done if the destination file already exists.
|
|
-}
|
|
linkAnnex :: FromTo -> Key -> RawFilePath -> Maybe InodeCache -> RawFilePath -> Maybe FileMode -> Annex LinkAnnexResult
|
|
linkAnnex _ _ _ Nothing _ _ = return LinkAnnexFailed
|
|
linkAnnex fromto key src (Just srcic) dest destmode =
|
|
withTSDelta (liftIO . genInodeCache dest) >>= \case
|
|
Just destic -> do
|
|
cs <- Database.Keys.getInodeCaches key
|
|
if null cs
|
|
then Database.Keys.addInodeCaches key [srcic, destic]
|
|
else Database.Keys.addInodeCaches key [srcic]
|
|
return LinkAnnexNoop
|
|
Nothing -> linkOrCopy key src dest destmode >>= \case
|
|
Nothing -> failed
|
|
Just r -> do
|
|
case fromto of
|
|
From -> thawContent dest
|
|
To -> case r of
|
|
Copied -> freezeContent dest
|
|
Linked -> noop
|
|
checksrcunchanged
|
|
where
|
|
failed = do
|
|
Database.Keys.addInodeCaches key [srcic]
|
|
return LinkAnnexFailed
|
|
checksrcunchanged = withTSDelta (liftIO . genInodeCache src) >>= \case
|
|
Just srcic' | compareStrong srcic srcic' -> do
|
|
destic <- withTSDelta (liftIO . genInodeCache dest)
|
|
Database.Keys.addInodeCaches key $
|
|
catMaybes [destic, Just srcic]
|
|
return LinkAnnexOk
|
|
_ -> do
|
|
liftIO $ removeWhenExistsWith R.removeLink dest
|
|
failed
|
|
|
|
{- Removes the annex object file for a key. Lowlevel. -}
|
|
unlinkAnnex :: Key -> Annex ()
|
|
unlinkAnnex key = do
|
|
obj <- calcRepo (gitAnnexLocation key)
|
|
modifyContent obj $ do
|
|
secureErase obj
|
|
liftIO $ removeWhenExistsWith R.removeLink obj
|
|
|
|
{- Runs an action to transfer an object's content.
|
|
-
|
|
- In some cases, it's possible for the file to change as it's being sent.
|
|
- If this happens, runs the rollback action and throws an exception.
|
|
- The rollback action should remove the data that was transferred.
|
|
-}
|
|
sendAnnex :: Key -> Annex () -> (FilePath -> Annex a) -> Annex a
|
|
sendAnnex key rollback sendobject = go =<< prepSendAnnex key
|
|
where
|
|
go (Just (f, checksuccess)) = do
|
|
r <- sendobject f
|
|
unlessM checksuccess $ do
|
|
rollback
|
|
giveup "content changed while it was being sent"
|
|
return r
|
|
go Nothing = giveup "content not available to send"
|
|
|
|
{- Returns a file that contains an object's content,
|
|
- and a check to run after the transfer is complete.
|
|
-
|
|
- When a file is unlocked, it's possble for its content to
|
|
- change as it's being sent. The check detects this case
|
|
- and returns False.
|
|
-
|
|
- Note that the returned check action is, in some cases, run in the
|
|
- Annex monad of the remote that is receiving the object, rather than
|
|
- the sender. So it cannot rely on Annex state.
|
|
-}
|
|
prepSendAnnex :: Key -> Annex (Maybe (FilePath, Annex Bool))
|
|
prepSendAnnex key = withObjectLoc key $ \f -> do
|
|
cache <- Database.Keys.getInodeCaches key
|
|
cache' <- if null cache
|
|
-- Since no inode cache is in the database, this
|
|
-- object is not currently unlocked. But that could
|
|
-- change while the transfer is in progress, so
|
|
-- generate an inode cache for the starting
|
|
-- content.
|
|
then maybeToList <$>
|
|
withTSDelta (liftIO . genInodeCache f)
|
|
else pure cache
|
|
return $ if null cache'
|
|
then Nothing
|
|
else Just (fromRawFilePath f, sameInodeCache f cache')
|
|
|
|
cleanObjectLoc :: Key -> Annex () -> Annex ()
|
|
cleanObjectLoc key cleaner = do
|
|
file <- calcRepo (gitAnnexLocation key)
|
|
void $ tryIO $ thawContentDir file
|
|
cleaner
|
|
liftIO $ removeparents file (3 :: Int)
|
|
where
|
|
removeparents _ 0 = noop
|
|
removeparents file n = do
|
|
let dir = parentDir file
|
|
maybe noop (const $ removeparents dir (n-1))
|
|
<=< catchMaybeIO $ removeDirectory (fromRawFilePath dir)
|
|
|
|
{- Removes a key's file from .git/annex/objects/ -}
|
|
removeAnnex :: ContentRemovalLock -> Annex ()
|
|
removeAnnex (ContentRemovalLock key) = withObjectLoc key $ \file ->
|
|
cleanObjectLoc key $ do
|
|
secureErase file
|
|
liftIO $ removeWhenExistsWith R.removeLink file
|
|
g <- Annex.gitRepo
|
|
mapM_ (\f -> void $ tryIO $ resetpointer $ fromTopFilePath f g)
|
|
=<< Database.Keys.getAssociatedFiles key
|
|
Database.Keys.removeInodeCaches key
|
|
where
|
|
-- Check associated pointer file for modifications, and reset if
|
|
-- it's unmodified.
|
|
resetpointer file = ifM (isUnmodified key file)
|
|
( adjustedBranchRefresh (AssociatedFile (Just file)) $
|
|
depopulatePointerFile key file
|
|
-- Modified file, so leave it alone.
|
|
-- If it was a hard link to the annex object,
|
|
-- that object might have been frozen as part of the
|
|
-- removal process, so thaw it.
|
|
, void $ tryIO $ thawContent file
|
|
)
|
|
|
|
{- Moves a key out of .git/annex/objects/ into .git/annex/bad, and
|
|
- returns the file it was moved to. -}
|
|
moveBad :: Key -> Annex FilePath
|
|
moveBad key = do
|
|
src <- calcRepo (gitAnnexLocation key)
|
|
bad <- fromRepo gitAnnexBadDir
|
|
let dest = bad P.</> P.takeFileName src
|
|
let dest' = fromRawFilePath dest
|
|
createAnnexDirectory (parentDir dest)
|
|
cleanObjectLoc key $
|
|
liftIO $ moveFile (fromRawFilePath src) dest'
|
|
logStatus key InfoMissing
|
|
return dest'
|
|
|
|
data KeyLocation = InAnnex | InAnywhere
|
|
|
|
{- InAnnex only lists keys with content in .git/annex/objects.
|
|
- InAnywhere lists all keys that have directories in
|
|
- .git/annex/objects, whether or not the content is present.
|
|
-}
|
|
listKeys :: KeyLocation -> Annex [Key]
|
|
listKeys keyloc = do
|
|
dir <- fromRepo gitAnnexObjectDir
|
|
{- In order to run Annex monad actions within unsafeInterleaveIO,
|
|
- the current state is taken and reused. No changes made to this
|
|
- state will be preserved.
|
|
-}
|
|
s <- Annex.getState id
|
|
depth <- gitAnnexLocationDepth <$> Annex.getGitConfig
|
|
liftIO $ walk s depth (fromRawFilePath dir)
|
|
where
|
|
walk s depth dir = do
|
|
contents <- catchDefaultIO [] (dirContents dir)
|
|
if depth < 2
|
|
then do
|
|
contents' <- filterM (present s) contents
|
|
let keys = mapMaybe (fileKey . P.takeFileName . toRawFilePath) contents'
|
|
continue keys []
|
|
else do
|
|
let deeper = walk s (depth - 1)
|
|
continue [] (map deeper contents)
|
|
continue keys [] = return keys
|
|
continue keys (a:as) = do
|
|
{- Force lazy traversal with unsafeInterleaveIO. -}
|
|
morekeys <- unsafeInterleaveIO a
|
|
continue (morekeys++keys) as
|
|
|
|
inanywhere = case keyloc of
|
|
InAnywhere -> True
|
|
_ -> False
|
|
|
|
present _ _ | inanywhere = pure True
|
|
present _ d = presentInAnnex d
|
|
|
|
presentInAnnex = doesFileExist . contentfile
|
|
contentfile d = d </> takeFileName d
|
|
|
|
{- Things to do to record changes to content when shutting down.
|
|
-
|
|
- It's acceptable to avoid committing changes to the branch,
|
|
- especially if performing a short-lived action.
|
|
-}
|
|
saveState :: Bool -> Annex ()
|
|
saveState nocommit = doSideAction $ do
|
|
Annex.Queue.flush
|
|
Database.Keys.closeDb
|
|
unless nocommit $
|
|
whenM (annexAlwaysCommit <$> Annex.getGitConfig) $
|
|
Annex.Branch.commit =<< Annex.Branch.commitMessage
|
|
|
|
{- Downloads content from any of a list of urls, displaying a progress
|
|
- meter. -}
|
|
downloadUrl :: Key -> MeterUpdate -> [Url.URLString] -> FilePath -> Url.UrlOptions -> Annex Bool
|
|
downloadUrl k p urls file uo =
|
|
-- Poll the file to handle configurations where an external
|
|
-- download command is used.
|
|
meteredFile file (Just p) k (go urls Nothing)
|
|
where
|
|
-- Display only one error message, if all the urls fail to
|
|
-- download.
|
|
go [] (Just err) = warning err >> return False
|
|
go [] Nothing = return False
|
|
go (u:us) _ = Url.download' p u file uo >>= \case
|
|
Right () -> return True
|
|
Left err -> go us (Just err)
|
|
|
|
{- Copies a key's content, when present, to a temp file.
|
|
- This is used to speed up some rsyncs. -}
|
|
preseedTmp :: Key -> FilePath -> Annex Bool
|
|
preseedTmp key file = go =<< inAnnex key
|
|
where
|
|
go False = return False
|
|
go True = do
|
|
ok <- copy
|
|
when ok $ thawContent (toRawFilePath file)
|
|
return ok
|
|
copy = ifM (liftIO $ doesFileExist file)
|
|
( return True
|
|
, do
|
|
s <- fromRawFilePath <$> (calcRepo $ gitAnnexLocation key)
|
|
liftIO $ ifM (doesFileExist s)
|
|
( copyFileExternal CopyTimeStamps s file
|
|
, return False
|
|
)
|
|
)
|
|
|
|
{- Finds files directly inside a directory like gitAnnexBadDir
|
|
- (not in subdirectories) and returns the corresponding keys. -}
|
|
dirKeys :: (Git.Repo -> RawFilePath) -> Annex [Key]
|
|
dirKeys dirspec = do
|
|
dir <- fromRawFilePath <$> fromRepo dirspec
|
|
ifM (liftIO $ doesDirectoryExist dir)
|
|
( do
|
|
contents <- liftIO $ getDirectoryContents dir
|
|
files <- liftIO $ filterM doesFileExist $
|
|
map (dir </>) contents
|
|
return $ mapMaybe (fileKey . P.takeFileName . toRawFilePath) files
|
|
, return []
|
|
)
|
|
|
|
{- 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
|
|
- (ie, their content is already present) are deleted.
|
|
-}
|
|
staleKeysPrune :: (Git.Repo -> RawFilePath) -> Bool -> Annex [Key]
|
|
staleKeysPrune dirspec nottransferred = do
|
|
contents <- dirKeys dirspec
|
|
|
|
dups <- filterM inAnnex contents
|
|
let stale = contents `exclude` dups
|
|
|
|
dir <- fromRepo dirspec
|
|
forM_ dups $ \k ->
|
|
pruneTmpWorkDirBefore (dir P.</> keyFile k)
|
|
(liftIO . R.removeLink)
|
|
|
|
if nottransferred
|
|
then do
|
|
inprogress <- S.fromList . map (transferKey . fst)
|
|
<$> getTransfers
|
|
return $ filter (`S.notMember` inprogress) stale
|
|
else return stale
|
|
|
|
{- Prune the work dir associated with the specified content file,
|
|
- before performing an action that deletes the file, or moves it away.
|
|
-
|
|
- This preserves the invariant that the workdir never exists without
|
|
- the content file.
|
|
-}
|
|
pruneTmpWorkDirBefore :: RawFilePath -> (RawFilePath -> Annex a) -> Annex a
|
|
pruneTmpWorkDirBefore f action = do
|
|
let workdir = fromRawFilePath $ gitAnnexTmpWorkDir f
|
|
liftIO $ whenM (doesDirectoryExist workdir) $
|
|
removeDirectoryRecursive workdir
|
|
action f
|
|
|
|
{- Runs an action, passing it a temporary work directory where
|
|
- it can write files while receiving the content of a key.
|
|
-
|
|
- Preserves the invariant that the workdir never exists without the
|
|
- content file, by creating an empty content file first.
|
|
-
|
|
- On exception, or when the action returns Nothing,
|
|
- the temporary work directory is retained (unless
|
|
- empty), so anything in it can be used on resume.
|
|
-}
|
|
withTmpWorkDir :: Key -> (RawFilePath -> Annex (Maybe a)) -> Annex (Maybe a)
|
|
withTmpWorkDir key action = do
|
|
-- Create the object file if it does not exist. This way,
|
|
-- staleKeysPrune only has to look for object files, and can
|
|
-- clean up gitAnnexTmpWorkDir for those it finds.
|
|
obj <- prepTmp key
|
|
let obj' = fromRawFilePath obj
|
|
unlessM (liftIO $ doesFileExist obj') $ do
|
|
liftIO $ writeFile obj' ""
|
|
setAnnexFilePerm obj
|
|
let tmpdir = gitAnnexTmpWorkDir obj
|
|
createAnnexDirectory tmpdir
|
|
res <- action tmpdir
|
|
case res of
|
|
Just _ -> liftIO $ removeDirectoryRecursive (fromRawFilePath tmpdir)
|
|
Nothing -> liftIO $ void $ tryIO $ removeDirectory (fromRawFilePath tmpdir)
|
|
return res
|
|
|
|
{- 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
|