mirror of
https://github.com/ilyakooo0/urbit.git
synced 2024-12-21 05:41:43 +03:00
48 lines
1.5 KiB
Haskell
48 lines
1.5 KiB
Haskell
{-|
|
|
Acquire and release the vere lockfile.
|
|
-}
|
|
|
|
module Urbit.Vere.LockFile (lockFile) where
|
|
|
|
import Urbit.Prelude
|
|
|
|
import Urbit.King.App.Class
|
|
|
|
import Data.Default (def)
|
|
import RIO.Directory (createDirectoryIfMissing)
|
|
import System.IO.LockFile.Internal (LockingParameters(..), RetryStrategy(..),
|
|
LockingException(..), lock, unlock)
|
|
|
|
--------------------------------------------------------------------------------
|
|
|
|
lockFile :: (HasLogFunc e, HasStderrLogFunc e) => FilePath -> RAcquire e ()
|
|
lockFile pax = void $ mkRAcquire start stop
|
|
where
|
|
fil = pax <> "/.vere.lock"
|
|
|
|
stop handle = do
|
|
logInfo $ display @Text $ ("Releasing lock file: " <> pack fil)
|
|
io $ unlock fil handle
|
|
|
|
params = def { retryToAcquireLock = No }
|
|
|
|
start = do
|
|
createDirectoryIfMissing True pax
|
|
logInfo $ display @Text $ ("Taking lock file: " <> pack fil)
|
|
handle failure $ io (lock params fil)
|
|
|
|
failure (e :: LockingException) = do
|
|
logStderr $ logError $ display @Text $
|
|
"Cannot acquire lock file " <> pack fil <> "."
|
|
logStderr $ logError $
|
|
"Please make sure there are no other instances of this ship running, "
|
|
<> "then try again."
|
|
logStderr $ logError $
|
|
"If you are sure, you can delete the file and try again."
|
|
throwIO e
|
|
|
|
logStderr :: HasStderrLogFunc e => RIO LogFunc a -> RIO e a
|
|
logStderr action = do
|
|
logFunc <- view stderrLogFuncL
|
|
runRIO logFunc action
|