Fix snapshot ID capture in snapper_zypp test

[cedvid]

Fixed the capture of snapshot ID. The test was failing in svirt-xen-hvm environment because the output of snapper ls included unwanted BTRFS info.

• Related ticket: https://progress.opensuse.org/issues/176199
• Verification runs:
  • SLE https://openqa.suse.de/tests/overview?build=cedvid%2Fos-autoinst-distri-opensuse%2321075
  • openSUSE https://openqa.opensuse.org/tests/overview?build=cedvid%2Fos-autoinst-distri-opensuse%2321075

[Vogtinator]

I actually doubt that this helps.

The unwanted output is not coming from snapper, it's coming from the kernel, triggered by snapper's btrfs qgroup refresh.

To fix this properly, either the kernel needs to be told to stay quiet, or a different method is used for getting script output.

If possible, this could also invoke snapper list with --disable-used-space to skip the qgroup refresh.

[cedvid]

@Vogtinator I’m not sure if you’ve had a chance to see the verification run, but the test is passing on svirt-xen-hvm with the change I made. If you think I should still look into the suggestions you mentioned, I’m happy to do so

[Vogtinator]

@Vogtinator I’m not sure if you’ve had a chance to see the verification run, but the test is passing on svirt-xen-hvm with the change I made. If you think I should still look into the suggestions you mentioned, I’m happy to do so

The root cause of broken serial_output on svirt-xen-kvm remains. I don't know whether using --columns number disables qgroup refresh or if this run was just lucky to not emit the kernel message.

On 12 SP5 it will likely still fail.

[Vogtinator]

Should work. Arguably this should be done for svirt-hvm-xen specifically though and not just here in this place.