From ad66bbd98b5b944fd22e103d2e25b723858954f5 Mon Sep 17 00:00:00 2001
From: Michael Weiss <dev.primeos@gmail.com>
Date: Wed, 25 Mar 2020 23:32:03 +0100
Subject: [PATCH] aseprite.skia: Override the gn version to fix the build

With #83290 merged the build would fail during the configuration phase:
```
configuring
ERROR at //gn/BUILDCONFIG.gn:85:14: Script returned non-zero exit code.
  is_clang = exec_script("gn/is_clang.py",
             ^----------
Current dir: /build/source/out/Release/
Command: python /build/source/gn/gn/is_clang.py cc c++
Returned 2.
stderr:

python: can't open file '/build/source/gn/gn/is_clang.py': [Errno 2] No such file or directory
```
---
 pkgs/applications/editors/aseprite/default.nix |  2 ++
 pkgs/applications/editors/aseprite/skia.nix    | 12 ++++++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/pkgs/applications/editors/aseprite/default.nix b/pkgs/applications/editors/aseprite/default.nix
index 6e6d7db81770..5ba0f9cf237e 100644
--- a/pkgs/applications/editors/aseprite/default.nix
+++ b/pkgs/applications/editors/aseprite/default.nix
@@ -98,6 +98,8 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
+  passthru = { inherit skia; };
+
   meta = with lib; {
     homepage = https://www.aseprite.org/;
     description = "Animated sprite editor & pixel art tool";
diff --git a/pkgs/applications/editors/aseprite/skia.nix b/pkgs/applications/editors/aseprite/skia.nix
index c89ebd4ad0c1..141d51bed0f8 100644
--- a/pkgs/applications/editors/aseprite/skia.nix
+++ b/pkgs/applications/editors/aseprite/skia.nix
@@ -6,6 +6,14 @@
 let
   # skia-deps.nix is generated by: ./skia-make-deps.sh 'angle2|dng_sdk|piex|sfntly'
   depSrcs = import ./skia-deps.nix { inherit fetchgit; };
+  gnOld = gn.overrideAttrs (oldAttrs: rec {
+    version = "20190403";
+    src = fetchgit {
+      url = "https://gn.googlesource.com/gn";
+      rev = "64b846c96daeb3eaf08e26d8a84d8451c6cb712b";
+      sha256 = "1v2kzsshhxn0ck6gd5w16gi2m3higwd9vkyylmsczxfxnw8skgpy";
+    };
+  });
 in
 stdenv.mkDerivation {
   name = "skia-aseprite-m71";
@@ -14,11 +22,11 @@ stdenv.mkDerivation {
     owner = "aseprite";
     repo = "skia";
     # latest commit from aseprite-m71 branch
-    rev = "89e4ca4352d05adc892f5983b108433f29b2c0c2";
+    rev = "89e4ca4352d05adc892f5983b108433f29b2c0c2"; # TODO: Remove the gnOld override
     sha256 = "0n3vrkswvi6rib9zv2pzi18h3j5wm7flmgkgaikcm6q7iw4l2c7x";
   };
 
-  nativeBuildInputs = [ python2 gn ninja ];
+  nativeBuildInputs = [ python2 gnOld ninja ];
 
   buildInputs = [
     fontconfig expat icu58 libglvnd libjpeg libpng libwebp zlib