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/virtualenvwrapper/default.nix

@@ -0,0 +1,75 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, pbr
+, pip
+, pkgs
+, stevedore
+, virtualenv
+, virtualenv-clone
+, python
+}:
+
+buildPythonPackage rec {
+  pname = "virtualenvwrapper";
+  version = "4.8.4";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "51a1a934e7ed0ff221bdd91bf9d3b604d875afbb3aa2367133503fee168f5bfa";
+  };
+
+  # pip depend on $HOME setting
+  preConfigure = "export HOME=$TMPDIR";
+
+  buildInputs = [ pbr pip pkgs.which ];
+  propagatedBuildInputs = [ stevedore virtualenv virtualenv-clone ];
+
+  postPatch = ''
+    for file in "virtualenvwrapper.sh" "virtualenvwrapper_lazy.sh"; do
+      substituteInPlace "$file" --replace "which" "${pkgs.which}/bin/which"
+
+      # We can't set PYTHONPATH in a normal way (like exporting in a wrapper
+      # script) because the user has to evaluate the script and we don't want
+      # modify the global PYTHONPATH which would affect the user's
+      # environment.
+      # Furthermore it isn't possible to just use VIRTUALENVWRAPPER_PYTHON
+      # for this workaround, because this variable is well quoted inside the
+      # shell script.
+      # (the trailing " -" is required to only replace things like these one:
+      # "$VIRTUALENVWRAPPER_PYTHON" -c "import os,[...] and not in
+      # if-statements or anything like that.
+      # ...and yes, this "patch" is hacky :)
+      substituteInPlace "$file" --replace '"$VIRTUALENVWRAPPER_PYTHON" -' 'env PYTHONPATH="$VIRTUALENVWRAPPER_PYTHONPATH" "$VIRTUALENVWRAPPER_PYTHON" -'
+    done
+  '';
+
+  postInstall = ''
+    # This might look like a dirty hack but we can't use the makeWrapper function because
+    # the wrapped file were then called via "exec". The virtualenvwrapper shell scripts
+    # aren't normal executables. Instead, the user has to evaluate them.
+
+    for file in "virtualenvwrapper.sh" "virtualenvwrapper_lazy.sh"; do
+      local wrapper="$out/bin/$file"
+      local wrapped="$out/bin/.$file-wrapped"
+      mv "$wrapper" "$wrapped"
+
+      # WARNING: Don't indent the lines below because that would break EOF
+      cat > "$wrapper" << EOF
+export PATH="${python}/bin:\$PATH"
+export VIRTUALENVWRAPPER_PYTHONPATH="$PYTHONPATH:$(toPythonPath $out)"
+source "$wrapped"
+EOF
+
+      chmod -x "$wrapped"
+      chmod +x "$wrapper"
+    done
+  '';
+
+  meta = with lib; {
+    description = "Enhancements to virtualenv";
+    homepage = "https://pypi.python.org/pypi/virtualenvwrapper";
+    license = licenses.mit;
+  };
+
+}