3963c5fcf5
The old approach opened the database an extra time to enable WAL mode, but more recent persistent-sqlite has a better API to enable it.
56 lines
1.8 KiB
Haskell
56 lines
1.8 KiB
Haskell
{- Persistent sqlite database initialization
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-
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- Copyright 2015-2018 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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module Database.Init where
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import Annex.Common
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import Annex.Perms
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import Utility.FileMode
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import Database.Handle
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import Database.Persist.Sqlite
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import qualified Database.Sqlite as Sqlite
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import Control.Monad.IO.Class (liftIO)
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import qualified Data.Text as T
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import Lens.Micro
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{- Ensures that the database is freshly initialized. Deletes any
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- existing database. Pass the migration action for the database.
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-
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- The permissions of the database are set based on the
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- core.sharedRepository setting. Setting these permissions on the main db
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- file causes Sqlite to always use the same permissions for additional
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- files it writes later on
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-}
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initDb :: FilePath -> SqlPersistM () -> Annex ()
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initDb db migration = do
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let dbdir = takeDirectory db
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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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runSqliteInfo (mkConnInfo tmpdb) migration
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setAnnexDirPerm tmpdbdir
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-- Work around sqlite bug that prevents it from honoring
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-- less restrictive umasks.
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liftIO $ setFileMode tmpdb =<< defaultFileMode
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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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{- Make sure that the database uses WAL mode, to prevent readers
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- from blocking writers, and prevent a writer from blocking readers.
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-
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- This is the default in persistent-sqlite currently, but force it on just
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- in case.
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-
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- Note that once WAL mode is enabled, it will persist whenever the
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- database is opened. -}
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mkConnInfo :: FilePath -> SqliteConnectionInfo
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mkConnInfo db = over walEnabled (const True) $
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mkSqliteConnectionInfo (T.pack db)
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