Cabal writes and rewrites dist/setup-config, causing access denied

[Bodigrim]

cabal/Cabal/src/Distribution/Simple/Configure.hs

Lines 318 to 334 in 26ab5ef

	-- | After running configure, output the 'LocalBuildInfo' to the
	-- 'localBuildInfoFile'.
	writePersistBuildConfig
	:: Maybe (SymbolicPath CWD (Dir Pkg))
	-- ^ Working directory
	-> SymbolicPath Pkg (Dir Dist)
	-- ^ The @dist@ directory path.
	-> LocalBuildInfo
	-- ^ The 'LocalBuildInfo' to write.
	-> IO ()
	writePersistBuildConfig mbWorkDir distPref lbi = do
	createDirectoryIfMissing False (i distPref)
	writeFileAtomic (i $ localBuildInfoFile distPref) $
	BLC8.unlines [showHeader pkgId, structuredEncode lbi]
	where
	i = interpretSymbolicPath mbWorkDir -- See Note [Symbolic paths] in Distribution.Utils.Path
	pkgId = localPackage lbi

While working on #10938, I noticed that writePersistBuildConfig is the most common source of race for file I/O. It seems like not only writePersistBuildConfig is executed more than once during the same build process, but it can happen to be executed concurrently from multiple Cabal threads, leading to self-imposed file access violation.

(localBuildInfoFile corresponds to dist/setup-config file)