[Rpm-maint] [rpm-software-management/rpm] RFE: Standardize on OCI images for test-suite, even locally (Issue #2643)

[Daan De Meyer]

There have indeed been quite a few improvements to mkosi lately so I understand that it might not have been suitable when you were working on this.

Note that when it comes to building cross building, we have CI in mkosi that verifies that verifies that mkosi can do cross distribution image builds for all supported distributions. The only combos that aren't directly supported are building Arch/Ubuntu/Debian images from OpenSUSE as they don't package apt or pacman. However, mkosi also supports so called tools trees, where it first builds an image with all necessary tools and then uses that image to build the actual image. So on OpenSUSE, you can build a Fedora tools tree and use that to build all other supported distributions. This is what we use in the systemd repository to build images on the Github Actions CI runners. We simply configure `ToolsTree=default` and `ToolsTreeDistribution=fedora` and mkosi will first build a Fedora image with all the latest and greatest tooling and then use that to build the actual image. Of course you still need the package manager on the host system to build the tools tree, but mkosi's CI makes sure that we're notified whenever something breaks in that area.

Re-using the local build directory might indeed be somewhat more difficult, since you would need to trick CMake into not wanting to reconfigure and rebuild when installing. But there's also no guarantee that the local build directory would actually work unless the dependencies are roughly the same as on the host.

Anyway, feel free to email me if you ever feel the itch to switch to mkosi.

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