785 lines
25 KiB
Haskell
785 lines
25 KiB
Haskell
{- git-annex file content managing
|
||
-
|
||
- Copyright 2010-2014 Joey Hess <id@joeyh.name>
|
||
-
|
||
- Licensed under the GNU GPL version 3 or higher.
|
||
-}
|
||
|
||
{-# LANGUAGE CPP #-}
|
||
|
||
module Annex.Content (
|
||
inAnnex,
|
||
inAnnex',
|
||
inAnnexSafe,
|
||
inAnnexCheck,
|
||
lockContentShared,
|
||
lockContentForRemoval,
|
||
ContentRemovalLock,
|
||
getViaTmp,
|
||
getViaTmp',
|
||
checkDiskSpaceToGet,
|
||
VerifyConfig(..),
|
||
Types.Remote.unVerified,
|
||
prepTmp,
|
||
withTmp,
|
||
checkDiskSpace,
|
||
moveAnnex,
|
||
sendAnnex,
|
||
prepSendAnnex,
|
||
removeAnnex,
|
||
moveBad,
|
||
KeyLocation(..),
|
||
getKeysPresent,
|
||
saveState,
|
||
downloadUrl,
|
||
preseedTmp,
|
||
freezeContent,
|
||
thawContent,
|
||
dirKeys,
|
||
withObjectLoc,
|
||
staleKeysPrune,
|
||
) where
|
||
|
||
import System.IO.Unsafe (unsafeInterleaveIO)
|
||
import qualified Data.Set as S
|
||
|
||
import Common.Annex
|
||
import Logs.Location
|
||
import Logs.Transfer
|
||
import qualified Git
|
||
import qualified Annex
|
||
import qualified Annex.Queue
|
||
import qualified Annex.Branch
|
||
import Utility.DiskFree
|
||
import Utility.FileMode
|
||
import qualified Annex.Url as Url
|
||
import Types.Key
|
||
import Utility.DataUnits
|
||
import Utility.CopyFile
|
||
import Config
|
||
import Git.SharedRepository
|
||
import Annex.Perms
|
||
import Annex.Link
|
||
import Annex.Content.Direct
|
||
import Annex.ReplaceFile
|
||
import Utility.LockPool
|
||
import Messages.Progress
|
||
import qualified Types.Remote
|
||
import qualified Types.Backend
|
||
import qualified Backend
|
||
import Types.NumCopies
|
||
import Annex.UUID
|
||
|
||
{- Checks if a given key's content is currently present. -}
|
||
inAnnex :: Key -> Annex Bool
|
||
inAnnex key = inAnnexCheck key $ liftIO . doesFileExist
|
||
|
||
{- Runs an arbitrary check on a key's content. -}
|
||
inAnnexCheck :: Key -> (FilePath -> Annex Bool) -> Annex Bool
|
||
inAnnexCheck key check = inAnnex' id False check key
|
||
|
||
{- Generic inAnnex, handling both indirect and direct mode.
|
||
-
|
||
- In direct mode, at least one of the associated files must pass the
|
||
- check. Additionally, the file must be unmodified.
|
||
-}
|
||
inAnnex' :: (a -> Bool) -> a -> (FilePath -> Annex a) -> Key -> Annex a
|
||
inAnnex' isgood bad check key = withObjectLoc key checkindirect checkdirect
|
||
where
|
||
checkindirect loc = do
|
||
whenM (fromRepo Git.repoIsUrl) $
|
||
error "inAnnex cannot check remote repo"
|
||
check loc
|
||
checkdirect [] = return bad
|
||
checkdirect (loc:locs) = do
|
||
r <- check loc
|
||
if isgood r
|
||
then ifM (goodContent key loc)
|
||
( return r
|
||
, checkdirect locs
|
||
)
|
||
else checkdirect locs
|
||
|
||
{- A safer check; the key's content must not only be present, but
|
||
- is not in the process of being removed. -}
|
||
inAnnexSafe :: Key -> Annex (Maybe Bool)
|
||
inAnnexSafe key = inAnnex' (fromMaybe True) (Just False) go key
|
||
where
|
||
is_locked = Nothing
|
||
is_unlocked = Just True
|
||
is_missing = Just False
|
||
|
||
go contentfile = maybe (checkindirect contentfile) (checkdirect contentfile)
|
||
=<< contentLockFile key
|
||
|
||
#ifndef mingw32_HOST_OS
|
||
checkindirect contentfile = liftIO $ checkOr is_missing contentfile
|
||
{- In direct mode, the content file must exist, but
|
||
- the lock file generally won't exist unless a removal is in
|
||
- process. -}
|
||
checkdirect contentfile lockfile = liftIO $
|
||
ifM (doesFileExist contentfile)
|
||
( checkOr is_unlocked lockfile
|
||
, return is_missing
|
||
)
|
||
checkOr d lockfile = do
|
||
v <- checkLocked lockfile
|
||
return $ case v of
|
||
Nothing -> d
|
||
Just True -> is_locked
|
||
Just False -> is_unlocked
|
||
#else
|
||
checkindirect f = liftIO $ ifM (doesFileExist f)
|
||
( do
|
||
v <- lockShared f
|
||
case v of
|
||
Nothing -> return is_locked
|
||
Just lockhandle -> do
|
||
dropLock lockhandle
|
||
return is_unlocked
|
||
, return is_missing
|
||
)
|
||
{- In Windows, see if we can take a shared lock. If so,
|
||
- remove the lock file to clean up after ourselves. -}
|
||
checkdirect contentfile lockfile =
|
||
ifM (liftIO $ doesFileExist contentfile)
|
||
( modifyContent lockfile $ liftIO $ do
|
||
v <- lockShared lockfile
|
||
case v of
|
||
Nothing -> return is_locked
|
||
Just lockhandle -> do
|
||
dropLock lockhandle
|
||
void $ tryIO $ nukeFile lockfile
|
||
return is_unlocked
|
||
, return is_missing
|
||
)
|
||
#endif
|
||
|
||
{- Direct mode and especially Windows has to use a separate lock
|
||
- file from the content, since locking the actual content file
|
||
- would interfere with the user's use of it. -}
|
||
contentLockFile :: Key -> Annex (Maybe FilePath)
|
||
#ifndef mingw32_HOST_OS
|
||
contentLockFile key = ifM isDirect
|
||
( Just <$> calcRepo (gitAnnexContentLock key)
|
||
, return Nothing
|
||
)
|
||
#else
|
||
contentLockFile key = Just <$> calcRepo (gitAnnexContentLock key)
|
||
#endif
|
||
|
||
{- Prevents the content from being removed while the action is running.
|
||
- Uses a shared lock.
|
||
-
|
||
- Does not actually check if the content is present. Use inAnnex for that.
|
||
- However, since the contentLockFile is the content file in indirect mode,
|
||
- if the content is not present, locking it will fail.
|
||
-
|
||
- If locking fails, throws an exception rather than running the action.
|
||
-
|
||
- Note that, in direct mode, nothing prevents the user from directly
|
||
- editing or removing the content, even while it's locked by this.
|
||
-}
|
||
lockContentShared :: Key -> (VerifiedCopy -> Annex a) -> Annex a
|
||
lockContentShared key a = lockContentUsing lock key $ do
|
||
u <- getUUID
|
||
withVerifiedCopy LockedCopy u (return True) a
|
||
where
|
||
#ifndef mingw32_HOST_OS
|
||
lock contentfile Nothing = liftIO $ 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.
|
||
-}
|
||
lockContentForRemoval :: Key -> (ContentRemovalLock -> Annex a) -> Annex a
|
||
lockContentForRemoval key a = lockContentUsing lock key $
|
||
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)
|
||
(liftIO $ 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 = FilePath -> Maybe LockFile -> Annex (Maybe LockHandle)
|
||
|
||
#ifndef mingw32_HOST_OS
|
||
posixLocker :: (Maybe FileMode -> LockFile -> IO (Maybe LockHandle)) -> LockFile -> Annex (Maybe LockHandle)
|
||
posixLocker takelock lockfile = do
|
||
mode <- annexFileMode
|
||
modifyContent lockfile $
|
||
liftIO $ takelock (Just mode) lockfile
|
||
|
||
#else
|
||
winLocker :: (LockFile -> IO (Maybe LockHandle)) -> ContentLocker
|
||
winLocker takelock _ (Just lockfile) = do
|
||
modifyContent lockfile $
|
||
void $ liftIO $ tryIO $
|
||
writeFile lockfile ""
|
||
liftIO $ takelock lockfile
|
||
-- never reached; windows always uses a separate lock file
|
||
winLocker _ _ Nothing = return Nothing
|
||
#endif
|
||
|
||
lockContentUsing :: ContentLocker -> Key -> Annex a -> Annex a
|
||
lockContentUsing locker key a = do
|
||
contentfile <- calcRepo $ gitAnnexLocation key
|
||
lockfile <- contentLockFile key
|
||
bracket
|
||
(lock contentfile lockfile)
|
||
(unlock lockfile)
|
||
(const a)
|
||
where
|
||
alreadylocked = error "content is locked"
|
||
failedtolock e = error $ "failed to lock content: " ++ show e
|
||
|
||
lock contentfile lockfile =
|
||
(maybe alreadylocked return
|
||
=<< locker contentfile lockfile)
|
||
`catchIO` failedtolock
|
||
|
||
#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 $
|
||
nukeFile 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 :: VerifyConfig -> Key -> (FilePath -> Annex (Bool, Types.Remote.Verification)) -> Annex Bool
|
||
getViaTmp v key action = checkDiskSpaceToGet key False $
|
||
getViaTmp' v key 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. -}
|
||
getViaTmp' :: VerifyConfig -> Key -> (FilePath -> Annex (Bool, Types.Remote.Verification)) -> Annex Bool
|
||
getViaTmp' v key action = do
|
||
tmpfile <- prepTmp key
|
||
(ok, verification) <- action tmpfile
|
||
if ok
|
||
then ifM (verifyKeyContent v verification key tmpfile)
|
||
( do
|
||
moveAnnex key tmpfile
|
||
logStatus key InfoPresent
|
||
return True
|
||
, do
|
||
warning "verification of content failed"
|
||
liftIO $ nukeFile tmpfile
|
||
return False
|
||
)
|
||
-- On transfer failure, the tmp file is left behind, in case
|
||
-- caller wants to resume its transfer
|
||
else return False
|
||
|
||
{- Verifies that a file is the expected content of a key.
|
||
- Configuration can prevent verification, for either a
|
||
- particular remote or always.
|
||
-
|
||
- Most keys have a known size, and if so, the file size is checked.
|
||
-
|
||
- When the key's backend allows verifying the content (eg via checksum),
|
||
- it is checked.
|
||
-}
|
||
verifyKeyContent :: VerifyConfig -> Types.Remote.Verification -> Key -> FilePath -> Annex Bool
|
||
verifyKeyContent _ Types.Remote.Verified _ _ = return True
|
||
verifyKeyContent v Types.Remote.UnVerified k f = ifM (shouldVerify v)
|
||
( verifysize <&&> verifycontent
|
||
, return True
|
||
)
|
||
where
|
||
verifysize = case Types.Key.keySize k of
|
||
Nothing -> return True
|
||
Just size -> do
|
||
size' <- liftIO $ catchDefaultIO 0 $ getFileSize f
|
||
return (size' == size)
|
||
verifycontent = case Types.Backend.verifyKeyContent =<< Backend.maybeLookupBackendName (Types.Key.keyBackendName k) of
|
||
Nothing -> return True
|
||
Just verifier -> verifier k f
|
||
|
||
data VerifyConfig = AlwaysVerify | NoVerify | RemoteVerify Remote | DefaultVerify
|
||
|
||
shouldVerify :: VerifyConfig -> Annex Bool
|
||
shouldVerify AlwaysVerify = return True
|
||
shouldVerify NoVerify = return False
|
||
shouldVerify DefaultVerify = annexVerify <$> Annex.getGitConfig
|
||
shouldVerify (RemoteVerify r) = shouldVerify DefaultVerify
|
||
<&&> pure (remoteAnnexVerify (Types.Remote.gitconfig r))
|
||
|
||
{- 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 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 FilePath
|
||
prepTmp key = do
|
||
tmp <- fromRepo $ gitAnnexTmpObjectLocation key
|
||
createAnnexDirectory (parentDir tmp)
|
||
return tmp
|
||
|
||
{- Creates 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 -> (FilePath -> Annex a) -> Annex a
|
||
withTmp key action = do
|
||
tmp <- prepTmp key
|
||
res <- action tmp
|
||
liftIO $ nukeFile tmp
|
||
return res
|
||
|
||
{- Checks that there is disk space available to store a given key,
|
||
- in a destination (or the annex) printing a warning if not.
|
||
-
|
||
- If the destination is on the same filesystem as the annex,
|
||
- checks for any other running downloads, removing the amount of data still
|
||
- to be downloaded from the free space. This way, we avoid overcommitting
|
||
- when doing concurrent downloads.
|
||
-}
|
||
checkDiskSpace :: Maybe FilePath -> Key -> Integer -> Bool -> Annex Bool
|
||
checkDiskSpace destination key alreadythere samefilesystem = ifM (Annex.getState Annex.force)
|
||
( return True
|
||
, do
|
||
-- We can't get inprogress and free at the same
|
||
-- time, and both can be changing, so there's a
|
||
-- small race here. Err on the side of caution
|
||
-- by getting inprogress first, so if it takes
|
||
-- a while, we'll see any decrease in the free
|
||
-- disk space.
|
||
inprogress <- if samefilesystem
|
||
then sizeOfDownloadsInProgress (/= key)
|
||
else pure 0
|
||
free <- liftIO . getDiskFree =<< dir
|
||
case (free, fromMaybe 1 (keySize key)) of
|
||
(Just have, need) -> do
|
||
reserve <- annexDiskReserve <$> Annex.getGitConfig
|
||
let delta = need + reserve - have - alreadythere + inprogress
|
||
let ok = delta <= 0
|
||
unless ok $
|
||
needmorespace delta
|
||
return ok
|
||
_ -> return True
|
||
)
|
||
where
|
||
dir = maybe (fromRepo gitAnnexDir) return destination
|
||
needmorespace n =
|
||
warning $ "not enough free space, need " ++
|
||
roughSize storageUnits True n ++
|
||
" more" ++ forcemsg
|
||
forcemsg = " (use --force to override this check or adjust annex.diskreserve)"
|
||
|
||
{- Moves a key's content into .git/annex/objects/
|
||
-
|
||
- In direct mode, moves it to the associated file, or files.
|
||
-
|
||
- 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.
|
||
-}
|
||
moveAnnex :: Key -> FilePath -> Annex ()
|
||
moveAnnex key src = withObjectLoc key storeobject storedirect
|
||
where
|
||
storeobject dest = ifM (liftIO $ doesFileExist dest)
|
||
( alreadyhave
|
||
, modifyContent dest $ do
|
||
liftIO $ moveFile src dest
|
||
freezeContent dest
|
||
)
|
||
storeindirect = storeobject =<< calcRepo (gitAnnexLocation key)
|
||
|
||
{- In direct mode, the associated file's content may be locally
|
||
- modified. In that case, it's preserved. However, the content
|
||
- we're moving into the annex may be the only extant copy, so
|
||
- it's important we not lose it. So, when the key's content
|
||
- cannot be moved to any associated file, it's stored in indirect
|
||
- mode.
|
||
-}
|
||
storedirect = storedirect' storeindirect
|
||
storedirect' fallback [] = fallback
|
||
storedirect' fallback (f:fs) = do
|
||
thawContent src
|
||
v <- isAnnexLink f
|
||
if Just key == v
|
||
then do
|
||
updateInodeCache key src
|
||
replaceFile f $ liftIO . moveFile src
|
||
chmodContent f
|
||
forM_ fs $
|
||
addContentWhenNotPresent key f
|
||
else ifM (goodContent key f)
|
||
( storedirect' alreadyhave fs
|
||
, storedirect' fallback fs
|
||
)
|
||
|
||
alreadyhave = liftIO $ removeFile src
|
||
|
||
{- Runs an action to transfer an object's content.
|
||
-
|
||
- In direct mode, it's possible for the file to change as it's being sent.
|
||
- If this happens, runs the rollback action and returns False. The
|
||
- rollback action should remove the data that was transferred.
|
||
-}
|
||
sendAnnex :: Key -> Annex () -> (FilePath -> Annex Bool) -> Annex Bool
|
||
sendAnnex key rollback sendobject = go =<< prepSendAnnex key
|
||
where
|
||
go Nothing = return False
|
||
go (Just (f, checksuccess)) = do
|
||
r <- sendobject f
|
||
ifM checksuccess
|
||
( return r
|
||
, do
|
||
rollback
|
||
return False
|
||
)
|
||
|
||
{- Returns a file that contains an object's content,
|
||
- and a check to run after the transfer is complete.
|
||
-
|
||
- In direct mode, it's possible for the file to change as it's being sent,
|
||
- and 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 indirect direct
|
||
where
|
||
indirect f = return $ Just (f, return True)
|
||
direct [] = return Nothing
|
||
direct (f:fs) = do
|
||
cache <- recordedInodeCache key
|
||
-- check that we have a good file
|
||
ifM (sameInodeCache f cache)
|
||
( return $ Just (f, sameInodeCache f cache)
|
||
, direct fs
|
||
)
|
||
|
||
{- Performs an action, passing it the location to use for a key's content.
|
||
-
|
||
- In direct mode, the associated files will be passed. But, if there are
|
||
- no associated files for a key, the indirect mode action will be
|
||
- performed instead. -}
|
||
withObjectLoc :: Key -> (FilePath -> Annex a) -> ([FilePath] -> Annex a) -> Annex a
|
||
withObjectLoc key indirect direct = ifM isDirect
|
||
( do
|
||
fs <- associatedFiles key
|
||
if null fs
|
||
then goindirect
|
||
else direct fs
|
||
, goindirect
|
||
)
|
||
where
|
||
goindirect = indirect =<< calcRepo (gitAnnexLocation key)
|
||
|
||
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 dir
|
||
|
||
{- Removes a key's file from .git/annex/objects/
|
||
-
|
||
- In direct mode, deletes the associated files or files, and replaces
|
||
- them with symlinks.
|
||
-}
|
||
removeAnnex :: ContentRemovalLock -> Annex ()
|
||
removeAnnex (ContentRemovalLock key) = withObjectLoc key remove removedirect
|
||
where
|
||
remove file = cleanObjectLoc key $ do
|
||
secureErase file
|
||
liftIO $ nukeFile file
|
||
removeInodeCache key
|
||
removedirect fs = do
|
||
cache <- recordedInodeCache key
|
||
removeInodeCache key
|
||
mapM_ (resetfile cache) fs
|
||
resetfile cache f = whenM (sameInodeCache f cache) $ do
|
||
l <- calcRepo $ gitAnnexLink f key
|
||
secureErase f
|
||
replaceFile f $ makeAnnexLink l
|
||
|
||
{- Runs the secure erase command if set, otherwise does nothing.
|
||
- File may or may not be deleted at the end; caller is responsible for
|
||
- making sure it's deleted. -}
|
||
secureErase :: FilePath -> Annex ()
|
||
secureErase file = maybe noop go =<< annexSecureEraseCommand <$> Annex.getGitConfig
|
||
where
|
||
go basecmd = void $ liftIO $
|
||
boolSystem "sh" [Param "-c", Param $ gencmd basecmd]
|
||
gencmd = massReplace [ ("%file", shellEscape 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 </> takeFileName src
|
||
createAnnexDirectory (parentDir dest)
|
||
cleanObjectLoc key $
|
||
liftIO $ moveFile src dest
|
||
logStatus key InfoMissing
|
||
return dest
|
||
|
||
data KeyLocation = InAnnex | InRepository
|
||
|
||
{- List of keys whose content exists in the specified location.
|
||
|
||
- InAnnex only lists keys under .git/annex/objects,
|
||
- while InRepository, in direct mode, also finds keys located in the
|
||
- work tree.
|
||
-
|
||
- Note that InRepository has to check whether direct mode files
|
||
- have goodContent.
|
||
-}
|
||
getKeysPresent :: KeyLocation -> Annex [Key]
|
||
getKeysPresent keyloc = do
|
||
direct <- isDirect
|
||
dir <- fromRepo gitAnnexObjectDir
|
||
s <- getstate direct
|
||
depth <- gitAnnexLocationDepth <$> Annex.getGitConfig
|
||
liftIO $ walk s direct depth dir
|
||
where
|
||
walk s direct depth dir = do
|
||
contents <- catchDefaultIO [] (dirContents dir)
|
||
if depth < 2
|
||
then do
|
||
contents' <- filterM (present s direct) contents
|
||
let keys = mapMaybe (fileKey . takeFileName) contents'
|
||
continue keys []
|
||
else do
|
||
let deeper = walk s direct (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
|
||
|
||
present _ False d = presentInAnnex d
|
||
present s True d = presentDirect s d <||> presentInAnnex d
|
||
|
||
presentInAnnex = doesFileExist . contentfile
|
||
contentfile d = d </> takeFileName d
|
||
|
||
presentDirect s d = case keyloc of
|
||
InAnnex -> return False
|
||
InRepository -> case fileKey (takeFileName d) of
|
||
Nothing -> return False
|
||
Just k -> Annex.eval s $
|
||
anyM (goodContent k) =<< associatedFiles k
|
||
|
||
{- 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.
|
||
-
|
||
- As an optimsation, call inodesChanged to prime the state with
|
||
- a cached value that will be used in the call to goodContent.
|
||
-}
|
||
getstate direct = do
|
||
when direct $
|
||
void inodesChanged
|
||
Annex.getState id
|
||
|
||
{- 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
|
||
unless nocommit $
|
||
whenM (annexAlwaysCommit <$> Annex.getGitConfig) $
|
||
Annex.Branch.commit "update"
|
||
|
||
{- Downloads content from any of a list of urls. -}
|
||
downloadUrl :: [Url.URLString] -> FilePath -> Annex Bool
|
||
downloadUrl urls file = go =<< annexWebDownloadCommand <$> Annex.getGitConfig
|
||
where
|
||
go Nothing = do
|
||
a <- ifM commandProgressDisabled
|
||
( return Url.downloadQuiet
|
||
, return Url.download
|
||
)
|
||
Url.withUrlOptions $ \uo ->
|
||
anyM (\u -> a u file uo) urls
|
||
go (Just basecmd) = anyM (downloadcmd basecmd) urls
|
||
downloadcmd basecmd url =
|
||
progressCommand "sh" [Param "-c", Param $ gencmd url basecmd]
|
||
<&&> liftIO (doesFileExist file)
|
||
gencmd url = massReplace
|
||
[ ("%file", shellEscape file)
|
||
, ("%url", shellEscape url)
|
||
]
|
||
|
||
{- 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 file
|
||
return ok
|
||
copy = ifM (liftIO $ doesFileExist file)
|
||
( return True
|
||
, do
|
||
s <- calcRepo $ gitAnnexLocation key
|
||
liftIO $ ifM (doesFileExist s)
|
||
( copyFileExternal CopyTimeStamps s file
|
||
, return False
|
||
)
|
||
)
|
||
|
||
{- Blocks writing to an annexed file, and modifies file permissions to
|
||
- allow reading it, per core.sharedRepository setting. -}
|
||
freezeContent :: FilePath -> Annex ()
|
||
freezeContent file = unlessM crippledFileSystem $
|
||
withShared go
|
||
where
|
||
go GroupShared = liftIO $ modifyFileMode file $
|
||
removeModes writeModes .
|
||
addModes [ownerReadMode, groupReadMode]
|
||
go AllShared = liftIO $ modifyFileMode file $
|
||
removeModes writeModes .
|
||
addModes readModes
|
||
go _ = liftIO $ modifyFileMode file $
|
||
removeModes writeModes .
|
||
addModes [ownerReadMode]
|
||
|
||
{- Adjusts read mode of annexed file per core.sharedRepository setting. -}
|
||
chmodContent :: FilePath -> Annex ()
|
||
chmodContent file = unlessM crippledFileSystem $
|
||
withShared go
|
||
where
|
||
go GroupShared = liftIO $ modifyFileMode file $
|
||
addModes [ownerReadMode, groupReadMode]
|
||
go AllShared = liftIO $ modifyFileMode file $
|
||
addModes readModes
|
||
go _ = liftIO $ modifyFileMode file $
|
||
addModes [ownerReadMode]
|
||
|
||
{- Allows writing to an annexed file that freezeContent was called on
|
||
- before. -}
|
||
thawContent :: FilePath -> Annex ()
|
||
thawContent file = unlessM crippledFileSystem $
|
||
withShared go
|
||
where
|
||
go GroupShared = liftIO $ groupWriteRead file
|
||
go AllShared = liftIO $ groupWriteRead file
|
||
go _ = liftIO $ allowWrite file
|
||
|
||
{- Finds files directly inside a directory like gitAnnexBadDir
|
||
- (not in subdirectories) and returns the corresponding keys. -}
|
||
dirKeys :: (Git.Repo -> FilePath) -> Annex [Key]
|
||
dirKeys dirspec = do
|
||
dir <- fromRepo dirspec
|
||
ifM (liftIO $ doesDirectoryExist dir)
|
||
( do
|
||
contents <- liftIO $ getDirectoryContents dir
|
||
files <- liftIO $ filterM doesFileExist $
|
||
map (dir </>) contents
|
||
return $ mapMaybe (fileKey . takeFileName) 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 -> 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
|
||
|
||
{- 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
|