uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/development/python-modules/oslo-concurrency/default.nix

@@ -0,0 +1,72 @@
+{ stdenv
+, lib
+, buildPythonPackage
+, fetchPypi
+, bash
+, coreutils
+, eventlet
+, fasteners
+, fixtures
+, iana-etc
+, libredirect
+, oslo-config
+, oslo-utils
+, oslotest
+, pbr
+, stestr
+}:
+
+buildPythonPackage rec {
+  pname = "oslo-concurrency";
+  version = "4.5.1";
+
+  src = fetchPypi {
+    pname = "oslo.concurrency";
+    inherit version;
+    sha256 = "sha256-aGm5Rrk9lbq/IM0Wvgb8NaXsFNB+osHzFfSsbqXw2hc=";
+  };
+
+  postPatch = ''
+    # only a small portion of the listed packages are actually needed for running the tests
+    # so instead of removing them one by one remove everything
+    rm test-requirements.txt
+
+    substituteInPlace oslo_concurrency/tests/unit/test_processutils.py \
+      --replace "/bin/bash" "${bash}/bin/bash" \
+      --replace "/bin/true" "${coreutils}/bin/true" \
+      --replace "/usr/bin/env" "${coreutils}/bin/env" \
+      --replace "/usr/bin/true" "${coreutils}/bin/true"
+  '';
+
+  propagatedBuildInputs = [
+    fasteners
+    oslo-config
+    oslo-utils
+    pbr
+  ];
+
+  checkInputs = [
+    eventlet
+    fixtures
+    oslotest
+    stestr
+  ];
+
+  checkPhase = ''
+    echo "nameserver 127.0.0.1" > resolv.conf
+    export NIX_REDIRECTS=/etc/protocols=${iana-etc}/etc/protocols:/etc/resolv.conf=$(realpath resolv.conf)
+    export LD_PRELOAD=${libredirect}/lib/libredirect.so
+
+    stestr run
+  '';
+
+  pythonImportsCheck = [ "oslo_concurrency" ];
+
+  meta = with lib; {
+    broken = stdenv.isDarwin;
+    description = "Oslo Concurrency library";
+    homepage = "https://github.com/openstack/oslo.concurrency";
+    license = licenses.asl20;
+    maintainers = teams.openstack.members;
+  };
+}