DMOD image build failures due to t-route

[robertbartel]

Currently it is not possible to build the DMOD ngen worker image. One of two different failures will occur, depending on whether the environment configuration is set to build the image with or without t-route.

UPDATE: the second failure has now been moved to its own issue: #676.

With t-route included by the image (which is the default), the following error is seen in the rocky_build_troute image build stage:

...
70.99 removing build/bdist.linux-x86_64/wheel
71.01 Successfully built troute_config-0.0.3.tar.gz and troute.config-0.0.3-py3-none-any.whl
71.04 python3: can't open file '/ngen/t-route/src/troute-nwm/setup.py': [Errno 2] No such file or directory
------
failed to solve: process "/bin/sh -c if [ \"${NGEN_WITH_ROUTING}\" == \"ON\" ]; then       export FC=gfortran ;       export F90=gfortran ;       mkdir ${WORKDIR}/t-route/wheels       && cd ${WORKDIR}/t-route       && ./compiler.sh       && cd ${WORKDIR}/t-route/src/troute-network       && python3 setup.py --use-cython bdist_wheel       && cp dist/*.whl ${WORKDIR}/t-route/wheels/       && cd ${WORKDIR}/t-route/src/troute-routing       && python3 setup.py --use-cython bdist_wheel       && cp dist/*.whl ${WORKDIR}/t-route/wheels/       && cd ${WORKDIR}/t-route/src/troute-config       && python3 -m build .       && cp dist/*.whl ${WORKDIR}/t-route/wheels/       && cd ${WORKDIR}/t-route/src/troute-nwm       && python3 setup.py bdist_wheel       && cp dist/*.whl ${WORKDIR}/t-route/wheels/ ;     fi" did not complete successfully: exit code: 2
Error: requested 'build' action failed (17); exiting without proceeding further

This is likely due to recent changes in t-route, though confirmation is still needed.

[robertbartel]

@aaraney, I don't suppose you can tell quickly from this exactly what needs to be adjusted in the image's t-route build stage, can you?

[aaraney]

Yep, this line is the issue. I simplified some of the build process for t-route in NOAA-OWP/t-route#784. As a result, troute.nwm no longer has a setup.py.

[aaraney]

So instead we can just build with:

      && cd ${WORKDIR}/t-route/src/troute-nwm \
      && python3 -m build . \
      && cp dist/*.whl ${WORKDIR}/t-route/wheels/ ; \
    fi

[aaraney]

@robertbartel, just opened #674. That should fix it. The easiest way to test that locally might be to just pull down the patch file. I learned recently that you can download a patch from github by just tacking on .patch to the end of a PR url. So, https://github.com/NOAA-OWP/DMOD/pull/674.patch for example. I thought it was kind of neat at least.