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There's a lot going on here, but essentially:
1. We change the `vmcheck` model so that it always operates on an
immutable base image. It takes that image and dynamically launches a
separate VM for each test using `kola spawn`. This means we can drop
a lot of hacks around re-using the same VMs.
2. Following from 1., `vmoverlay` now takes as input a base image,
overlays the built rpm-ostree bits, then creates a new base image. Of
course, we don't have to do this in CI, because we build FCOS with
the freshly built RPMs (so it uses `SKIP_VMOVERLAY=1`). `vmoverlay`
then will be more for the developer case where one doesn't want to
iterate via `cosa build` to test rpm-ostree changes. I say "will"
because the functionality doesn't exist yet; I'd like to enhance
`cosa dev-overlay` to do this. (Note `vmsync` should still works just
as before too.)
3. `vmcheck` can be run without building the tree first, as
`tests/vmcheck.sh`. The `make vmcheck` target still exists though for
finger compatibility and better meshing with `vmoverlay` in the
developer case.
What's really nice about using kola spawn is that it takes care of a lot
of things for us, such as the qemu command, journal and console
gathering, and SSH.
Similarly to the compose testsuites, we're using parallel here to run
multiple vmcheck tests at once. (On developer laptops, we cap
parallelism at `$(nproc) - 1`).
That way, anyone can easily download the latest built RPMs from master
or a specific PR. This isn't a replacement for automated builds in Koji
though since it's not multi-arch.
Also fetch the tags so that the NEVRA derived from `git describe` is
nicer.
Jenkins is tricky: it does an initial checkout, merges the PR head into
the target branch, then creates the pod. Once in the pod, we do a
`checkout scm` which *also* merges the PR head into the target branch.
However, the `change.GIT_COMMIT` variable we get from that is set to the
SHA of the first merge, not the second one. Which... yeah is super
confusing since we explicitly assign `change` from that `checkout scm`
operation. So that's probably a valid bug.
This was then throwing off `ci-commitmessage-submodules.sh` since it
didn't find the merge commit in the graph.
Anyway, not going to spend more time on this. Let's just not pass any
commit at all. The git range `origin/master..HEAD` already does what we
want (go through all the commits in HEAD *not* in master).
This is an experiment in using Jenkins pipelines for our CI. See similar
initiatives in coreos-assembler[1] and fedora-coreos-config[2].
For now, this only does the following testing:
- checks commit for unintended submodule bumps
- checks the minimum Rust version
- builds RPMs
- builds FCOS (with the new RPMs both for executing the build
itself, as well as included in the built OS)
There are dummy placeholders for where we'd actually run the vmcheck
and the compose testsuites. Let's address those trickier parts as
follow-ups.
[1] https://github.com/coreos/coreos-assembler/pull/667
[2] https://github.com/coreos/fedora-coreos-config/pull/131Closes: #1899
Approved by: cgwalters
