Support building and running tests with podman

[tmds]

This is building and tests pass on Fedora with podman from Fedora repos and s2i from https://github.com/openshift/source-to-image/releases.

Some tests are not passing with podman and are being skipped. I need to look into this further.

Based on this, I've created some issues for podman vs docker differences: containers/podman#3184, containers/podman#3191

Fixes #274

[tmds]

🎉 This ran successful on f30 ci for building the centos and ubi images.

On f29 and rhel8 it doesn't due to bugs/missing features in the podman stack.
I hope in the near future this will also 'just work' on rhel8 when the packages gets updated.

You can run this rootless, but then you have to update your inotify and open fd limits. Otherwise the test will fail in strange ways. Running as sudo is the simplest to work around those limits.

@aslicerh @omajid can you review the proposed changes?

[aslicerh]

Woo! Thanks for all this. I'll look it over later today, but I just wanted to address something real quick:

I hope in the near future this will also 'just work' on rhel8 when the packages gets updated.

podman is expected be updated in 8.1 to a version that supports 'podman cp', so I expect that it would.

[tmds]

podman is expected be updated in 8.1 to a version that supports 'podman cp', so I expect that it would.

Great! The build on rhel8 got pretty far, until it hit the missing podman cp in test_devmode.

[aslicerh]

Great! The build on rhel8 got pretty far, until it hit the missing podman cp in test_devmode.

Locally I've replaced the podman cp with mounting a directory on the host and manipulating the files that way and it has passed the devmode and split_build tests, just to add.

[tmds]

Locally I've replaced the podman cp with mounting a directory on the host and manipulating the files that way and it has passed the devmode and split_build tests, just to add.

If you share the code I can put it in. Unless you don't mind waiting for rhel8.1?
My main interest is this works on f30 because that is what I use for development.

[tmds]

If there are no further review comments, I will copy over the changes to the 2.2 version and then merge this after a successful run on f30 CI.

[aslicerh]

This all looks good to me. Thanks for all the hard work!

Also, I like your solution to the libpod issue much better than the terrible and hacky one I had for my own tests!

[tmds]

Thanks Andrew, I'm sure your workarounds weren't too bad :)

[tmds]

Our f30 CI vm is broken. I ran the tests locally and they passed.