From 84c94765c3fc1586b640d4bdd20dec599c24b72b Mon Sep 17 00:00:00 2001 From: Debian Haskell Group Date: Sun, 8 Apr 2018 21:24:00 +0100 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 b2d85a78..a24d009a 100644 --- a/compiler/main/SysTools.hs +++ b/compiler/main/SysTools.hs @@ -68,6 +68,7 @@ import Platform import Util import DynFlags import Exception +import Fingerprint import LlvmCodeGen.Base (llvmVersionStr, supportedLlvmVersion) @@ -1121,8 +1122,8 @@ 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 @@ -1558,6 +1559,13 @@ 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