[commit: ghc] master: Add ways to build hadrian using nix (#473) (8fd6818)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/8fd68186b24e7fbb447401dd482e5b42f60b40f8/ghc

>---------------------------------------------------------------

commit 8fd68186b24e7fbb447401dd482e5b42f60b40f8
Author: Moritz Angermann <moritz.angermann at gmail.com>
Date:   Tue Nov 21 04:06:25 2017 +0800

    Add ways to build hadrian using nix (#473)
    
    * Add ways to build hadrian using nix
    
    This adds two new files to the hadrian directory
    
        shell.nix sets up the build envrionment you need to build ghc
        build-nix is a simple wrapper which invokes hadrian in the correct environment
    
    Note: this patch was authored by @mpickering, however it ended up on phabricator due to the subtree as https://phabricator.haskell.org/D4207.
    
    * Comments and renamed build-nix


>---------------------------------------------------------------

8fd68186b24e7fbb447401dd482e5b42f60b40f8
 build.stack.nix.sh => build.nix.sh | 18 ++++++-----
 shell.nix                          | 61 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+), 8 deletions(-)

diff --git a/build.stack.nix.sh b/build.nix.sh
similarity index 66%
copy from build.stack.nix.sh
copy to build.nix.sh
index 59ac061..4b03ea8 100755
--- a/build.stack.nix.sh
+++ b/build.nix.sh
@@ -1,12 +1,9 @@
-#!/usr/bin/env bash
+#!/usr/bin/env nix-shell
+#! nix-shell -i bash shell.nix
 
-set -euo pipefail
+# This script sets up the build environment by invoking nix-shell shell.nix
+# and then runs the hadrian executable.
 
-# readlink on os x, doesn't support -f, to prevent the
-# need of installing coreutils (e.g. through brew, just
-# for readlink, we use the follownig substitute.
-#
-# source: http://stackoverflow.com/a/1116890
 function rl {
     TARGET_FILE="$1"
 
@@ -29,5 +26,10 @@ function rl {
 }
 
 absoluteRoot="$(dirname "$(rl "$0")")"
+echo $absoluteRoot
+cd "$absoluteRoot"
 
-HADRIAN_NIX=YES ${absoluteRoot}/build.stack.sh
+hadrian         \
+  --lint                         \
+  --directory="$absoluteRoot/.." \
+  "$@"
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..e9a5ecc
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,61 @@
+# Invoking nix-shell sets up an environment where we can build ghc
+# by only invoking hadrian.
+
+
+{ nixpkgs ? import <nixpkgs> {} }:
+
+let
+  haskellPackages = nixpkgs.haskell.packages.ghc821;
+
+  removeBuild = path: type:
+    let baseName = baseNameOf (toString path);
+    in
+        ! (baseName == "_build"
+           || baseName == "dist"
+           || baseName == "dist-newstyle"
+           || baseName == ".stack-work"
+           || baseName == "config.log"
+           || baseName == "config.status"
+           || nixpkgs.lib.hasSuffix ".sh" baseName
+           || !(nixpkgs.lib.cleanSourceFilter path type)) ;
+
+  filterSrc = path: builtins.filterSource removeBuild path;
+
+
+  hadrianPackages = nixpkgs.haskell.packages.ghc821.override {
+    overrides = self: super: let
+        localPackage = name: path: self.callCabal2nix name (filterSrc path) {};
+      in {
+        hadrian = localPackage "hadrian" ./. ;
+        shake = self.callHackage "shake" "0.16" {};
+        Cabal = localPackage "Cabal" ./../libraries/Cabal/Cabal ;
+        filepath = localPackage "filepath" ./../libraries/filepath ;
+        text = localPackage "text" ./../libraries/text  ;
+        hpc = localPackage"hpc" ./../libraries/hpc ;
+        parsec = localPackage "parsec" ./../libraries/parsec ;
+        HUnit = nixpkgs.haskell.lib.dontCheck (self.callHackage "HUnit" "1.3.1.2" {});
+        process = localPackage "process" ./../libraries/process ;
+        directory = localPackage "directory" ./../libraries/directory ;
+      }; };
+
+in
+
+  nixpkgs.stdenv.mkDerivation {
+    name = "ghc-dev";
+    buildInputs = [
+                    hadrianPackages.hadrian
+                    nixpkgs.haskell.compiler.ghc821
+                    haskellPackages.alex
+                    haskellPackages.happy
+                    nixpkgs.python3
+                    nixpkgs.git
+                    nixpkgs.autoconf
+                    nixpkgs.automake
+                    nixpkgs.perl
+                    nixpkgs.gcc
+                    nixpkgs.python3Packages.sphinx
+                    nixpkgs.ncurses
+                    nixpkgs.m4
+                    nixpkgs.gmp
+                    nixpkgs.file ];
+  }