firedrake: Initial packaging

firedrake/pyop2.nix

@@ -0,0 +1,52 @@
+with import <nixpkgs> {};
+
+let
+
+  mpi4py   = import ./mpi4py.nix;
+  coffee   = import ./coffee.nix;
+  petsc    = import ./petsc.nix;
+  petsc4py = import ./petsc4py.nix;
+
+in
+
+  python27Packages.buildPythonPackage rec {
+    version = "98aab7bbbab2945317c1b9ecf5885652cf20e709";
+    name = "PyOP2-${version}";
+
+    src = fetchFromGitHub {
+      owner = "OP2";
+      repo = "PyOP2";
+      rev = "${version}";
+      sha256 = "167yl4vmw8r9pbn7issjvpflhisjnn42dnw6rfz6bp1rw9v4n4md";
+    };
+
+    buildInputs = [
+      openmpi
+      python27Packages.cython
+      python27Packages.pytest
+      python27Packages.flake8
+      python27Packages.pycparser
+      petsc
+    ];
+
+    propagatedBuildInputs = [
+      python27Packages.six
+      python27Packages.numpy
+      python27Packages.decorator
+      mpi4py
+      coffee
+      petsc4py
+    ];
+
+    postPatch = ''
+      sed -i -e 's|self\._cc = os\.environ\.get(ccenv, cc)|self._cc = '\'"$(type -p mpicxx)"\''' if cpp else '\'"$(type -p mpicc)"\'''|' pyop2/compilation.py
+      sed -i -e 's|self\._ld = os\.environ\.get('\'''LDSHARED'\''', ld)|self._ld = None|' pyop2/compilation.py
+      sed -i -e 's|os\.environ\['\'''PETSC_DIR'\'''\]|'\'''${petsc}'\'''|' pyop2/utils.py
+    '';
+
+    meta = {
+      homepage = "http://op2.github.io/PyOP2/";
+      description = "Framework for performance-portable parallel computations on unstructured meshes.";
+      license = licenses.bsd3;
+    };
+  }