From af480796c9e447e63f2c3720543b8e1c148cf34b Mon Sep 17 00:00:00 2001
From: Timo Kaufmann <timokau@zoho.com>
Date: Sat, 2 Nov 2019 14:20:12 +0100
Subject: [PATCH] sage: ignore cmp deprecation in sagenb

---
 .../math/sage/patches/sagenb-cmp-deprecation.patch  | 13 +++++++++++++
 pkgs/applications/science/math/sage/sagenb.nix      |  5 +++++
 2 files changed, 18 insertions(+)
 create mode 100644 pkgs/applications/science/math/sage/patches/sagenb-cmp-deprecation.patch

diff --git a/pkgs/applications/science/math/sage/patches/sagenb-cmp-deprecation.patch b/pkgs/applications/science/math/sage/patches/sagenb-cmp-deprecation.patch
new file mode 100644
index 00000000000..9f502a66951
--- /dev/null
+++ b/pkgs/applications/science/math/sage/patches/sagenb-cmp-deprecation.patch
@@ -0,0 +1,13 @@
+diff --git a/sagenb/__init__.py b/sagenb/__init__.py
+index 4db0d2cb..2fc5f01e 100644
+--- a/sagenb/__init__.py
++++ b/sagenb/__init__.py
+@@ -1,3 +1,8 @@
+ # -*- coding: utf-8 -*
+   # init
++import warnings
+ from . import storage
++
++# deprecation in attrs, needs to be fixed in twisted
++warnings.filterwarnings('ignore', category=DeprecationWarning,
++    message=r'The usage of `cmp` is deprecated and will be removed.*')
diff --git a/pkgs/applications/science/math/sage/sagenb.nix b/pkgs/applications/science/math/sage/sagenb.nix
index 03b5b7a3bbf..77b2168ad97 100644
--- a/pkgs/applications/science/math/sage/sagenb.nix
+++ b/pkgs/applications/science/math/sage/sagenb.nix
@@ -26,6 +26,11 @@ buildPythonPackage rec {
     sha256 = "0bxvhr03qh2nsjdfc4pyfiqrn9jhp3vf7irsc9gqx0185jlblbxs";
   };
 
+  patches = [
+    # cmp deprecation in attrs needs to be handled in twisted
+    ./patches/sagenb-cmp-deprecation.patch
+  ];
+
   propagatedBuildInputs = [
     twisted
     flask