Re: [RFT] bootlinux: add bisection support

[Luis Chamberlain <mcgrof@kernel.org>]

On Thu, Apr 24, 2025 at 10:08:09AM -0700, Luis Chamberlain wrote:
> On Thu, Apr 24, 2025 at 08:40:52AM +0200, Daniel Gomez wrote:
> > If make linux-deploy installs a "bad" ref kernel with a boot problem, the VM
> > will always boot into the "bad" kernel. How is the script going to boot the new
> > kernel for testing if the new ref is "bad"/"good"?
> 
> Good point.
> 
> On the guest:
> 
> kdevops@bisect ~ $ awk -F\' '/menuentry / {print $2}'
> /boot/grub/grub.cfg | awk '{print NR-1 " ... " $0}'
> 0 ... Debian GNU/Linux, with Linux 6.15.0-rc3-next-20250423
> 1 ... Debian GNU/Linux, with Linux 6.15.0-rc3-next-20250423 (recovery mode)
> 2 ... Debian GNU/Linux, with Linux 6.15.0-rc3-05015-g2ecdc8872668
> 3 ... Debian GNU/Linux, with Linux 6.15.0-rc3-05015-g2ecdc8872668 (recovery mode)
> 4 ... Debian GNU/Linux, with Linux 6.15.0-rc3-04291-g400331cd3ff4
> 5 ... Debian GNU/Linux, with Linux 6.15.0-rc3-04291-g400331cd3ff4 (recovery mode)
> 6 ... Debian GNU/Linux, with Linux 6.15.0-rc3-02800-g3686e26dd260
> 7 ... Debian GNU/Linux, with Linux 6.15.0-rc3-02800-g3686e26dd260 (recovery mode)
> 8 ... Debian GNU/Linux, with Linux 6.12.22-amd64
> 9 ... Debian GNU/Linux, with Linux 6.12.22-amd64 (recovery mode)
> 10 ... Debian GNU/Linux, with Linux 6.12.20-amd64
> 11 ... Debian GNU/Linux, with Linux 6.12.20-amd64 (recovery mode)
> 12 ... Debian GNU/Linux, with Linux 6.12.19-amd64
> 13 ... Debian GNU/Linux, with Linux 6.12.19-amd64 (recovery mode)
> 14 ... UEFI Firmware Settings
> 
> Right now it fails to boot. On the host:
> 
> GUEST=bisect
> sudo virsh destroy $GUEST
> DISK=$(sudo virsh dumpxml $GUEST | xmllint --xpath "string(//devices/disk[@device='disk']/source/@file)" -)
> 
> virt-customize --format raw -a $DISK --run-command 'grub-set-default 8'
> [   0.0] Examining the guest ...
> [   8.7] Setting a random seed
> [   8.7] Running: grub-set-default 8
> [   8.8] SELinux relabelling
> [   8.8] Finishing off

I forgot to mention here I obviously followed up with

sudo virsh start bisect

> ssh bisect uname -r
> 6.12.22-amd64

  Luis