From 34679d486ff32d5f53369c9e7316b48fc15bd1ef Mon Sep 17 00:00:00 2001 From: Debian Haskell Group Date: Wed, 5 Oct 2016 19:27:23 +0000 Subject: [PATCH] reproducible-tmp-names This is an attempt to make GHC build reproducible. The name of .c files may end up in the resulting binary (in the debug section), but not the directory. Instead of using the process id, create a hash from the command line arguments, and assume that is going to be unique. Gbp-Pq: Name reproducible-tmp-names --- compiler/main/SysTools.hs | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/compiler/main/SysTools.hs b/compiler/main/SysTools.hs index 8c3ab1a8..11e89618 100644 --- a/compiler/main/SysTools.hs +++ b/compiler/main/SysTools.hs @@ -66,6 +66,7 @@ import Platform import Util import DynFlags import Exception +import Fingerprint import Data.IORef import Control.Monad @@ -1152,8 +1153,8 @@ getTempDir dflags = do mapping <- readIORef dir_ref case Map.lookup tmp_dir mapping of Nothing -> do - pid <- getProcessID - let prefix = tmp_dir "ghc" ++ show pid ++ "_" + pid <- getStableProcessID + let prefix = tmp_dir "ghc" ++ pid ++ "_" mask_ $ mkTempDir prefix Just dir -> return dir where @@ -1531,6 +1532,13 @@ getProcessID :: IO Int getProcessID = System.Posix.Internals.c_getpid >>= return . fromIntegral #endif +-- Debian-specific hack to get reproducible output, by not using the "random" +-- pid, but rather something determinisic +getStableProcessID :: IO String +getStableProcessID = do + args <- getArgs + return $ take 4 $ show $ fingerprintString $ unwords args + -- Divvy up text stream into lines, taking platform dependent -- line termination into account. linesPlatform :: String -> [String] -- 2.30.2