40ecf58d4b
This does not change the overall license of the git-annex program, which was already AGPL due to a number of sources files being AGPL already. Legally speaking, I'm adding a new license under which these files are now available; I already released their current contents under the GPL license. Now they're dual licensed GPL and AGPL. However, I intend for all my future changes to these files to only be released under the AGPL license, and I won't be tracking the dual licensing status, so I'm simply changing the license statement to say it's AGPL. (In some cases, others wrote parts of the code of a file and released it under the GPL; but in all cases I have contributed a significant portion of the code in each file and it's that code that is getting the AGPL license; the GPL license of other contributors allows combining with AGPL code.)
94 lines
2.6 KiB
Haskell
94 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 AGPL 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.Queue as H
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import Database.Init
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import Annex.Locations
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import Utility.Exception
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import Annex.Common
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import Annex.LockFile
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import Database.Persist.Sql hiding (Key)
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import Database.Persist.TH
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import Data.Time.Clock
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data FsckHandle = FsckHandle H.DbQueue 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 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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initDb db $ void $
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runMigrationSilent migrateFsck
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lockFileCached =<< fromRepo (gitAnnexFsckDbLock u)
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h <- liftIO $ H.openDbQueue H.MultiWriter 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.closeDbQueue 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 checkcommit $
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void $ insertUnique $ Fscked sk
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where
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sk = toSKey k
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-- commit queue after 1000 files or 5 minutes, whichever comes first
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checkcommit sz lastcommittime
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| sz > 1000 = return True
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| otherwise = do
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now <- getCurrentTime
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return $ diffUTCTime lastcommittime now > 300
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{- Doesn't know about keys that were just added with addDb. -}
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inDb :: FsckHandle -> Key -> IO Bool
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inDb (FsckHandle h _) = H.queryDbQueue h . inDb' . toSKey
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inDb' :: SKey -> SqlPersistM Bool
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inDb' sk = do
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r <- selectList [FsckedKey ==. sk] []
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return $ not $ null r
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