I've booted into the ventoy boot menu, had selected the holoiso and got this error message.
ERROR: '/dev/disk/by-label/HOLO_202207' device did not show up after 30 seconds
I didn't found anything in the official error list so I've removed the holo part and found this and ŧhis thread.
Long story short, I've entered the following commands.
mkdir /mnt_ventoy_data
mount /dev/sdb1 /mnt_ventoy_data
mkdir /mnt_iso
mount /mnt_ventoy_data/HoloIso_[...].iso /mnt_iso
ln -sf /mnt_iso /dev/archiso
exit
That's it. So what have I done in detail? With the knowledge that I was dropped into a ramfs and that the arch bootup script is expecting a /dev/archiso, all I need to do is to mount the right iso file.
To get this iso file, I first needed to mount the ventoy data partition. Once mounted, all I need to do is to mount the iso and softlink this mount to /dev/archiso.
I ran into this error error: archzfs: signature from "ArchZFS Bot <buildbot@archzfs.com>" is unknown trust on multiple machines over the last days.
Since one machine was working which is also running one of my dns servers, I was searching into this direction.
After a while, I switched all my machines using this one dns server without fixing the real issue.
Furthermore, by just trying to refresh keys with sudo pacman-key --refresh-keys, I ran into another error: gpg: WARNING: Tor is not running.
I could solve this with a one liner:
echo "no-use-tor" >> ~/.gnupg/dirmngr.conf
Next step was finally to delete the broken key and re-import ist again.