Fix complex mode in dolfinx/dolfinx images

[jorgensd]

As far as I can tell, the issue is that the pip3 install command creates a build directory that caches some info when we build the dolfinx real and then complex mode.

I've added a test to the docker.yml CI that picks up this issue, and suggested a new fix (removing the build directories from dolfinx/python after installation.

Should hopefully resolve #2201

[francesco-ballarin]

can we manually run the docker pipeline to test this?

[jhale]

The underlying reason for this might have been a change in pip related to switching from out-of-source to in-source builds, although I'm not certain.

Regarding the patch, I think it would be best to source our own configuration script dolfinx-complex-mode rather than manually setup the environment.

[jorgensd]

The underlying reason for this might have been a change in pip related to switching from out-of-source to in-source builds, although I'm not certain.

Regarding the patch, I think it would be best to source our own configuration script dolfinx-complex-mode rather than manually setup the environment.

I wasnt able to make a one-line command that did that with docker run. If you could show me how to do that I’d be grateful.

[jhale]

Misunderstood the thread, deleting.

[jhale]

I've triggered a build with this branch at b7e508b.

[jhale]

This patch hasn't fixed the issue. DOLFINx Python still seems to link to PETSc real mode libraries.

[jhale]

https://github.com/FEniCS/dolfinx/runs/6652047258?check_suite_focus=true