pythonPackages.cx_oracle: use new odpic from nixpkgs

pkgs/development/python-modules/cx_oracle/0001-odpi-src-dpiOci.c-nixify-libclntsh.so-dlopen.patch

@@ -1,27 +0,0 @@
-From 355b9d812efdfbd041e14b365258b69c81689981 Mon Sep 17 00:00:00 2001
-From: Florian Klink <flokli@flokli.de>
-Date: Thu, 17 May 2018 18:37:40 +0200
-Subject: [PATCH] odpi/src/dpiOci.c: nixify libclntsh.so dlopen
-
----
- odpi/src/dpiOci.c | 4 ++++
- 1 file changed, 4 insertions(+)
-
-diff --git a/odpi/src/dpiOci.c b/odpi/src/dpiOci.c
-index 76b9867..22c2987 100644
---- a/odpi/src/dpiOci.c
-+++ b/odpi/src/dpiOci.c
-@@ -1575,6 +1575,10 @@ static int dpiOci__loadLib(dpiError *error)
-             }
-         }
-     }
-+    if(!dpiOciLibHandle) {
-+        dpiOciLibHandle = dlopen("@libclntsh@", RTLD_LAZY);
-+    }
-+
- #endif
- 
-     if (!dpiOciLibHandle) {
--- 
-2.16.3
-

pkgs/development/python-modules/cx_oracle/default.nix

@@ -1,22 +1,19 @@
-{ stdenv, buildPythonPackage, fetchPypi, oracle-instantclient }:
+{ stdenv, buildPythonPackage, fetchPypi, odpic }:
 
 buildPythonPackage rec {
   pname = "cx_Oracle";
   version = "6.3.1";
 
-  buildInputs = [
-    oracle-instantclient
-  ];
+  buildInputs = [ odpic ];
 
   src = fetchPypi {
     inherit pname version;
     sha256 = "0200j6jh80rpgzxmvgcxmkshaj4zadq32g2i97nlwiq3f7q374l7";
   };
 
-  patches = [ ./0001-odpi-src-dpiOci.c-nixify-libclntsh.so-dlopen.patch ];
-
-  postPatch = ''
-    substituteInPlace odpi/src/dpiOci.c --replace @libclntsh@ "${oracle-instantclient}/lib/libclntsh.so";
+  preConfigure = ''
+    export ODPIC_INC_DIR="${odpic}/include"
+    export ODPIC_LIB_DIR="${odpic}/lib"
   '';
 
   # Check need an Oracle database to run