Fix for running Django on Darwin/macOS

[svniemeijer]

Issue description

The latest python Django versions (1.10/1.11) are dependent on GEOS/GDAL.
The existing patch script 1.10-gis-libs.template.patch hardcodes a .so library as default path, but this should be .dylib libraries on Darwin.
The attached 'patch to the patch' fixes this.

Steps to reproduce

Install Django package on Darwin.

Technical details

• System: (macOS Sierra 10.12.6)
• Nix version: (nix-env (Nix) 1.11.13)
• Nixpkgs version: ("17.09pre111304.5328102325")
• Sandboxing enabled: (run grep build-use-sandbox /etc/nix/nix.conf)

[svniemeijer]

--- a/django/contrib/gis/gdal/libgdal.py
+++ b/django/contrib/gis/gdal/libgdal.py
@@ -17,7 +17,11 @@ try:
     lib_path = settings.GDAL_LIBRARY_PATH
 except (AttributeError, EnvironmentError,
         ImportError, ImproperlyConfigured):
-    lib_path = None
+    from platform import system as _system
+    if _system() == "Darwin":
+        lib_path = "@gdal@/lib/libgdal.dylib"
+    else:
+        lib_path = "@gdal@/lib/libgdal.so"
 
 if lib_path:
     lib_names = None
diff --git a/django/contrib/gis/geos/libgeos.py b/django/contrib/gis/geos/libgeos.py
--- a/django/contrib/gis/geos/libgeos.py
+++ b/django/contrib/gis/geos/libgeos.py
@@ -26,7 +26,11 @@ try:
         lib_path = settings.GEOS_LIBRARY_PATH
     except (AttributeError, EnvironmentError,
             ImportError, ImproperlyConfigured):
-        lib_path = None
+        from platform import system as _system
+        if _system() == "Darwin":
+            lib_path = "@geos@/lib/libgeos_c.dylib"
+        else:
+            lib_path = "@geos@/lib/libgeos_c.so"
 
     # Setting the appropriate names for the GEOS-C library.
     if lib_path:

[joseph-long]

👍 , just ran into this issue.

[FRidh]

@svniemeijer you can use stdenv.hostPlatform.extensions.sharedLibrary as extension (and it includes the dot).

[FRidh]

Pushed the fix 549188c to master and 17.09 as 8c00f93.