ungleich-tools/debian-devuan-netboot.sh

#!/bin/sh
# Nico Schottelius, 2019-12-09
# the ugly code is llnu

#this can only run in the ungleich-tools directory because of the cat magiccommand........

if [ $# -ne 2 ]; then
    echo $0 suite out-directory
    echo out-directory: into which directory to place resulting files
    echo suite is for instance ascii, beowulf, etc
    exit 1
fi

suite=$1; shift
outdir=$1; shift

date=$(date +%F)

dir=${outdir}/${suite}-${date}
kernel=kernel-${dir}
initramfs=initramfs-${dir}
keyurl=https://code.ungleich.ch/ungleich-public/__ungleich_staff_ssh_access/raw/master/files

debootstrap "${suite}" "${dir}"

chroot ${dir} apt install  -y openssh-server rdnssd linux-image-amd64

cat > ${dir}/etc/network/interfaces << EOF
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet6 auto
EOF

cp ${dir}/boot/vmlinuz-* ${kernel}

echo '* * * * * root ip -o -6 addr show | grep -E -v 'lo |one' > /etc/issue'  > ${dir}/etc/cron.d/ipv6addr

mkdir -p ${dir}/root/.ssh

for key in balazs dominique jinguk nico; do
    curl -s ${keyurl}/${key}.pub >> ${dir}/root/.ssh/authorized_keys
done

# ensure there is /init in the initramfs -> otherwise there is a kernel panic
# reason: initramfs is designed to be PRE regular os, so /init usually hands over to /sbin/init
# in our case, they are just the same
ln -s /sbin/init ${dir}/init

( cd ${dir} ; find . | cpio -H newc -o | gzip -9 > ${initramfs} )