From b2cf9529d641ddd4a3e7dc210f87d68b4653dfd2 Mon Sep 17 00:00:00 2001
From: Eric Wolf <ericwolf42@gmail.com>
Date: Wed, 15 Aug 2018 08:00:55 +0200
Subject: [PATCH] ptask: remove usage of nonexistent function is_error

see https://github.com/json-c/json-c/issues/304
---
 pkgs/applications/misc/ptask/default.nix           |  2 +-
 pkgs/applications/misc/ptask/json_c_is_error.patch | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)
 create mode 100644 pkgs/applications/misc/ptask/json_c_is_error.patch

diff --git a/pkgs/applications/misc/ptask/default.nix b/pkgs/applications/misc/ptask/default.nix
index e1a64c73a123..6cbc90806caa 100644
--- a/pkgs/applications/misc/ptask/default.nix
+++ b/pkgs/applications/misc/ptask/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkgconfig makeWrapper ];
 
-  patches = [ ./tw-version.patch ];
+  patches = [ ./tw-version.patch ./json_c_is_error.patch ];
 
   preFixup = ''
     wrapProgram "$out/bin/ptask" \
diff --git a/pkgs/applications/misc/ptask/json_c_is_error.patch b/pkgs/applications/misc/ptask/json_c_is_error.patch
new file mode 100644
index 000000000000..435c8b26e6f7
--- /dev/null
+++ b/pkgs/applications/misc/ptask/json_c_is_error.patch
@@ -0,0 +1,13 @@
+diff --git a/src/tw.c b/src/tw.c
+index 602f7b3..ca601cd 100644
+--- a/src/tw.c
++++ b/src/tw.c
+@@ -163,7 +163,7 @@ static struct json_object *task_exec_json(const char *opts)
+ 
+ 	free(cmd);
+ 
+-	if (o && is_error(o))
++	if (!o)
+ 		return NULL;
+ 
+ 	return o;