MBR partition table used for .isos, breaking mediacheck

[ggardet]

As reported here: https://bugzilla.opensuse.org/show_bug.cgi?id=1235096
mediacheck fails on aarch64 live images on openSUSE Tumbleweed since this update https://build.opensuse.org/requests/1233432/changes
which is basically an update from 10.2.3 to 10.2.5

[ggardet]

May be related to #2695 ?

[schaefi]

mediacheck is a suse tool written by Steffen Winterfeldt. Can you please double check with Steffen what's going on here ? Neither the bug report nor the report here gives me any details that would allow a proper fix.

The changes in #2695 were done in a way that the default layout is not changed. Thus changes to the ISO layout would only apply if certain options are set which is not the case for the TW live images.

Thanks

[Vogtinator]

This also broke in 15.6 now, with the backport of kiwi 10.

I had a look and the reason it appears to fail on aarch64 only is that it's booted over USB, so kiwi performs repartitioning before mediacheck. If I prevent that from happening by making the drive size == .iso size, mediacheck passes.

I noticed a difference in the output of the last working iso: https://openqa.opensuse.org/tests/5418789#step/mediacheck/7 and the first failing one: https://openqa.opensuse.org/tests/5461231#step/mediacheck/10: The working one has partition: start 32 kiB while the failing one has partition: start 0.5 kiB.

[Vogtinator]

The working one has partition: start 32 kiB while the failing one has partition: start 0.5 kiB.

Yep, that's it. The cause for the difference is that tagmedia only supports MBR, so it only sees the fake "GPT" MBR partition:

Device                                                     Boot Start     End Sectors Id Type Start-C/H/S End-C/H/S Attrs
openSUSE-Leap-15.6-GNOME-Live-aarch64-Build19.1-Media.iso1          1 1875311 1875311 ee GPT        0/0/2 915/43/16

While it would be nice to have GPT support in checkmedia, I think it's a bug that kiwi uses GPT here. The documentation says:

kiwi/doc/source/image_description/elements.rst

Lines 412 to 415 in 9ad2ee6

	efiparttable="msdos|gpt":
	For images with an EFI firmware specifies the partition
	table type to use. If not set defaults to the GPT partition
	table type for disk images, MBR (msdos) for ISO images.

The option is not set in the openSUSE live media, but kiwi uses GPT anyway. In previous versions of kiwi, it used MBR.

[github-actions]

This issue is stale because it has been open 60 days with no activity. stale label was set.