ecb0d5c087
The one exception is in Utility.Daemon. As long as a process only daemonizes once, which seems reasonable, and as long as it avoids calling checkDaemon once it's already running as a daemon, the fcntl locking gotchas won't be a problem there. Annex.LockFile has it's own separate lock pool layer, which has been renamed to LockCache. This is a persistent cache of locks that persist until closed. This is not quite done; lockContent stil needs to be converted.
100 lines
2.6 KiB
Haskell
100 lines
2.6 KiB
Haskell
{- Sqlite database used for incremental fsck.
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-
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- Copyright 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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{-# LANGUAGE QuasiQuotes, TypeFamilies, TemplateHaskell #-}
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{-# LANGUAGE OverloadedStrings, GADTs, FlexibleContexts #-}
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{-# LANGUAGE MultiParamTypeClasses, GeneralizedNewtypeDeriving #-}
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{-# LANGUAGE RankNTypes #-}
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module Database.Fsck (
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FsckHandle,
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newPass,
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openDb,
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closeDb,
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addDb,
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inDb,
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FsckedId,
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) where
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import Database.Types
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import qualified Database.Handle as H
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import Locations
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import Utility.PosixFiles
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import Utility.Exception
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import Common
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import Annex
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import Types.Key
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import Types.UUID
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import Annex.Perms
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import Annex.LockFile
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import Database.Persist.TH
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import Database.Esqueleto hiding (Key)
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data FsckHandle = FsckHandle H.DbHandle UUID
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{- Each key stored in the database has already been fscked as part
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- of the latest incremental fsck pass. -}
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share [mkPersist sqlSettings, mkMigrate "migrateFsck"] [persistLowerCase|
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Fscked
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key SKey
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UniqueKey key
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|]
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{- The database is removed when starting a new incremental fsck pass.
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-
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- This may fail, if other fsck processes are currently running using the
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- database. Removing the database in that situation would lead to crashes
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- or unknown behavior.
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-}
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newPass :: UUID -> Annex Bool
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newPass u = isJust <$> tryExclusiveLock (gitAnnexFsckDbLock u) go
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where
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go = liftIO . void . tryIO . removeDirectoryRecursive
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=<< fromRepo (gitAnnexFsckDbDir u)
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{- Opens the database, creating it atomically if it doesn't exist yet. -}
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openDb :: UUID -> Annex FsckHandle
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openDb u = do
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dbdir <- fromRepo (gitAnnexFsckDbDir u)
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let db = dbdir </> "db"
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unlessM (liftIO $ doesFileExist db) $ do
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let tmpdbdir = dbdir ++ ".tmp"
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let tmpdb = tmpdbdir </> "db"
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liftIO $ do
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createDirectoryIfMissing True tmpdbdir
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H.initDb tmpdb $ void $
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runMigrationSilent migrateFsck
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setAnnexDirPerm tmpdbdir
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setAnnexFilePerm tmpdb
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liftIO $ do
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void $ tryIO $ removeDirectoryRecursive dbdir
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rename tmpdbdir dbdir
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lockFileCached =<< fromRepo (gitAnnexFsckDbLock u)
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h <- liftIO $ H.openDb db "fscked"
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return $ FsckHandle h u
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closeDb :: FsckHandle -> Annex ()
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closeDb (FsckHandle h u) = do
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liftIO $ H.closeDb h
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unlockFile =<< fromRepo (gitAnnexFsckDbLock u)
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addDb :: FsckHandle -> Key -> IO ()
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addDb (FsckHandle h _) k = H.queueDb h 1000 $
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void $ insertUnique $ Fscked sk
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where
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sk = toSKey k
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inDb :: FsckHandle -> Key -> IO Bool
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inDb (FsckHandle h _) = H.queryDb h . inDb' . toSKey
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inDb' :: SKey -> SqlPersistM Bool
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inDb' sk = do
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r <- select $ from $ \r -> do
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where_ (r ^. FsckedKey ==. val sk)
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return (r ^. FsckedKey)
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return $ not $ null r
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