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diff --git a/vendor/cabal-helper-0.8.1.2/src/CabalHelper/Compiletime/Data.hs b/vendor/cabal-helper-0.8.1.2/src/CabalHelper/Compiletime/Data.hs
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+-- cabal-helper: Simple interface to Cabal's configuration state
+-- Copyright (C) 2015-2017  Daniel Gröber <cabal-helper@dxld.at>
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation, either version 3 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+{-# LANGUAGE TemplateHaskell, ScopedTypeVariables #-}
+{-# OPTIONS_GHC -fforce-recomp #-}
+
+{-|
+Module      : CabalHelper.Compiletime.Data
+Description : Embeds source code for runtime component using TH
+License     : GPL-3
+-}
+
+module CabalHelper.Compiletime.Data where
+
+import Control.Monad
+import Control.Monad.IO.Class
+import Data.Functor
+import qualified Data.ByteString as BS
+import qualified Data.ByteString.UTF8 as UTF8
+import Language.Haskell.TH
+import System.Directory
+import System.FilePath
+import System.IO.Temp
+import System.PosixCompat.Files
+import System.PosixCompat.Time
+import System.PosixCompat.Types
+import Prelude
+
+import CabalHelper.Compiletime.Compat.Environment
+
+withSystemTempDirectoryEnv :: String -> (FilePath -> IO b) -> IO b
+withSystemTempDirectoryEnv tpl f = do
+  m <- liftIO $ lookupEnv "CABAL_HELPER_KEEP_SOURCEDIR"
+  case m of
+    Nothing -> withSystemTempDirectory tpl f
+    Just _  -> do
+           tmpdir <- getCanonicalTemporaryDirectory
+           f =<< createTempDirectory tmpdir tpl
+
+createHelperSources :: FilePath -> IO ()
+createHelperSources dir = do
+    let chdir = dir </> "CabalHelper"
+    liftIO $ do
+      createDirectoryIfMissing True $ chdir </> "Runtime"
+      createDirectoryIfMissing True $ chdir </> "Shared"
+
+    let modtime :: EpochTime
+        modtime = fromIntegral $ (read :: String -> Integer)
+          -- See https://reproducible-builds.org/specs/source-date-epoch/
+          $(runIO $ do
+             msde :: Maybe Integer
+                  <- fmap read <$> lookupEnv "SOURCE_DATE_EPOCH"
+             (current_time :: Integer) <- round . toRational <$> epochTime
+             return $ LitE . StringL $ show $ maybe current_time id msde)
+
+    liftIO $ forM_ sourceFiles $ \(fn, src) -> do
+        let path = chdir </> fn
+        BS.writeFile path $ UTF8.fromString src
+        setFileTimes path modtime modtime
+
+
+sourceFiles :: [(FilePath, String)]
+sourceFiles =
+  [ ("Runtime/Main.hs",     $(LitE . StringL <$> runIO (UTF8.toString <$> BS.readFile "src/CabalHelper/Runtime/Main.hs")))
+  , ("Shared/Common.hs",    $(LitE . StringL <$> runIO (UTF8.toString <$> BS.readFile "src/CabalHelper/Shared/Common.hs")))
+  , ("Shared/Sandbox.hs",   $(LitE . StringL <$> runIO (UTF8.toString <$> BS.readFile "src/CabalHelper/Shared/Sandbox.hs")))
+  , ("Shared/InterfaceTypes.hs",     $(LitE . StringL <$> runIO (UTF8.toString <$> BS.readFile "src/CabalHelper/Shared/InterfaceTypes.hs")))
+  ]