How to: boot some Linux into RAM, partition the first drive, mkfs, untar a tgz and reboot?

[guettli]

I am new to netboot.xyz.

I want to automate this:

Why iPXE some Linux images gets started.

Then (without manual interaction) a script starts.

If I get to this point, everything is fine. I can write the script myself. The script will partition the first disk, mkfs.ext4, untar a tgz, chroot into the new partition, install grub and reboot.

I tried it with alpine, but failed: https://serverfault.com/questions/1147870/alpine-boot-via-ipxe-and-execute-a-script-cant-stat-filesystem-no-such-fil

I don't need Alpine. As long as I have a shell, fdisk, some way to make /dev/sda1 appear after fdisk.

The iPXE booting already works.

I just need an image and a way to automatically start my script.

Any feedback is welcome. Thank you!