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{- Persistent sqlite database initialization
-
- Copyright 2015-2017 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Database.Init where
import Annex.Common
import Annex.Perms
import Utility.FileMode
import Database.Persist.Sqlite
import qualified Database.Sqlite as Sqlite
import Control.Monad.IO.Class (liftIO)
import qualified Data.Text as T
{- Ensures that the database is freshly initialized. Deletes any
- existing database. Pass the migration action for the database.
-
- The database is initialized using WAL mode, to prevent readers
- from blocking writers, and prevent a writer from blocking readers.
-
- The permissions of the database are set based on the
- core.sharedRepository setting. Setting these permissions on the main db
- file causes Sqlite to always use the same permissions for additional
- files it writes later on
-}
initDb :: FilePath -> SqlPersistM () -> Annex ()
initDb db migration = do
let dbdir = takeDirectory db
let tmpdbdir = dbdir ++ ".tmp"
let tmpdb = tmpdbdir </> "db"
liftIO $ do
createDirectoryIfMissing True tmpdbdir
let tdb = T.pack tmpdb
enableWAL tdb
runSqlite tdb migration
setAnnexDirPerm tmpdbdir
-- Work around sqlite bug that prevents it from honoring
-- less restrictive umasks.
liftIO $ setFileMode tmpdb =<< defaultFileMode
setAnnexFilePerm tmpdb
liftIO $ do
void $ tryIO $ removeDirectoryRecursive dbdir
rename tmpdbdir dbdir
enableWAL :: T.Text -> IO ()
enableWAL db = do
conn <- Sqlite.open db
stmt <- Sqlite.prepare conn (T.pack "PRAGMA journal_mode=WAL;")
void $ Sqlite.step stmt
void $ Sqlite.finalize stmt
Sqlite.close conn
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