I am Sergio, working as a QA engineer at SUSE.
It is nice to have more people interested in openSUSE for IBM Z. I am helping from the testing side by enabling openQA tests. See https://openqa.opensuse.org/group_overview/34
I managed to enable two scenarios but we are having technical problems at the moment with the machine setup for the tests and they are showing only red. I expect to keep enabling the same scenarios that we have for SLE as soon as the testing machines are fixed.
I have a lot of knowledge gaps in how the product is built, but just in case you need an overview, here is what I know.
Tumbleweed installation for x86 is built in https://build.opensuse.org/project/show/openSUSE:Factory, but Tumbleweed installation for s390 is done in the sub project https://build.opensuse.org/project/show/openSUSE:Factory:zSystems And the build sent to openQA for testing is in https://build.opensuse.org/project/show/openSUSE:Factory:zSystems:ToTes t So, if you want to download and use the last Tumbleweed snapshot for s390, you can find it in https://build.opensuse.org/package/binaries/openSUSE:Factory:zSystems:T oTest/000product:openSUSE-dvd5-dvd-s390x/images
A lot of packages are inherited from the x86 project, so when you try to fix an inherited package, the submit request has to be done to the x86 (factory) package and the changes will get forwarded to the zsystems project Some s390 specific changes are are made in “OBS package links”, so that those changes are not made in the x86 version. (But, I think that Berthold, someone who is also fixing packages for s390, wanted to unify the changes so that package links are not needed). If you have any question, do not hesitate to ask.
It is exciting to see how this small group of mainframe enthusiasts (mainframers?) starts growing.
Kind Regards and have a lot of fun!