root@ubuntu4:~# cd /
root@ubuntu4:/# ./kexec_nixos
+ set -e
++ mktemp -d
+ cd /tmp/tmp.lAhvTGC6vo
+ pwd
/tmp/tmp.lAhvTGC6vo
+ mkdir initrd
+ pushd initrd
/tmp/tmp.lAhvTGC6vo/initrd /tmp/tmp.lAhvTGC6vo
+ '[' -e /ssh_pubkey ']'
+ gzip -9
+ cpio -o -H newc
+ find -type f
1 block
+ popd
/tmp/tmp.lAhvTGC6vo
+ cat /nix/store/y5x5yx5sz67ar18pjljp3hk4wypzhq66-image/initrd extra.gz
+ kexec -l /nix/store/y5x5yx5sz67ar18pjljp3hk4wypzhq66-image/kernel --initrd=final.gz '--append=init=/nix/store/8n02w8d8aymg0zwy99kg0iapm18ab95r-nixos-system-kexec-20.09pre219796.f601ab37c2f/init console=ttyS0,115200 panic=30 boot.panic_on_fail loglevel=4'
+ sync
+ systemctl kexec
Connection to 127.0.0.1 closed by remote host.
Connection to 127.0.0.1 closed.

[ixxie@laptop]$ ssh -p 2222 root@127.0.0.1
Welcome to Ubuntu 18.04.4 LTS (GNU/Linux 4.15.0-96-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

 System information disabled due to load higher than 1.0


21 packages can be updated.
0 updates are security updates.


Last login: Sun Apr 12 15:41:15 2020 from 10.0.2.2
root@ubuntu4:~#