NO-JIRA: tests/replace-rt-kernel: fix and improve

[jlebon]

It's a bit odd to have this test pull the c9s.repo yum repo from the
master branch of openshift/os. We don't want to be in a situation where
a change in master breaks older branches.

But also, c9s.repo could at any point in time refer to either the
latest compose output or the official mirrors. But we always want to
use the official mirrors for this test since that has multiple package
versions and we need to be able to select a kernel version which is not
equal to ours.

We could curl the official centos.repo file (and actually, in the
SCOS case, it's already in the image), but that file doesn't include
additional repos like rt and nfv which we need for our test.

Instead, just bake the config into the test data. That way we don't need
to curl anything at all, and the repo definition is naturally bound to
the test and can be modified together atomically.

A few additional changes:

1. only do all the repo preparations stuff on the first boot
2. add logic to pick a kernel that's different from the one we're on if
   we're already CentOS-based (this fixes [rhel-9.4 variant] ext.config.rpm-ostree.replace-rt-kernel fails #1383)
3. add a stub for c10s for when we're ready

Closes: #1383

[jlebon]

I've tested this on master (RHCOS and SCOS variants), release-4.15 (RHCOS), and release-4.14 (RHCOS).

[jmarrero]

lgtm

[jmarrero]

/lgtm
/approve

[dustymabe]

should we mention somewhere in here where we got this from and how to update it in the future?

[jlebon]

Good point. Will add a comment in a follow-up.

[dustymabe]

/lgtm

[openshift-ci]

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This pull-request has been approved by: dustymabe, jlebon, jmarrero

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[openshift-ci]

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[openshift-ci-robot]

@jlebon: This pull request explicitly references no jira issue.

In response to this:

It's a bit odd to have this test pull the c9s.repo yum repo from the
master branch of openshift/os. We don't want to be in a situation where
a change in master breaks older branches.

But also, c9s.repo could at any point in time refer to either the
latest compose output or the official mirrors. But we always want to
use the official mirrors for this test since that has multiple package
versions and we need to be able to select a kernel version which is not
equal to ours.

We could curl the official centos.repo file (and actually, in the
SCOS case, it's already in the image), but that file doesn't include
additional repos like rt and nfv which we need for our test.

Instead, just bake the config into the test data. That way we don't need
to curl anything at all, and the repo definition is naturally bound to
the test and can be modified together atomically.

A few additional changes:

1. only do all the repo preparations stuff on the first boot
2. add logic to pick a kernel that's different from the one we're on if
   we're already CentOS-based (this fixes [rhel-9.4 variant] ext.config.rpm-ostree.replace-rt-kernel fails #1383)
3. add a stub for c10s for when we're ready

Closes: #1383

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[jlebon]

/cherrypick release-4.15 release 4.14

[openshift-cherrypick-robot]

@jlebon: #1506 failed to apply on top of branch "release-4.15":

Applying: denylist: drop ext.config.rpm-ostree.replace-rt-kernel
Using index info to reconstruct a base tree...
M	kola-denylist.yaml
Falling back to patching base and 3-way merge...
Auto-merging kola-denylist.yaml
CONFLICT (content): Merge conflict in kola-denylist.yaml
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 denylist: drop ext.config.rpm-ostree.replace-rt-kernel
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherrypick release-4.15 release 4.14

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