From b1321a3823685ad664fd9ac7197e51f4db3e3760 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timoth=C3=A9e=20Floure?= <timothee.floure@posteo.net>
Date: Sun, 4 Oct 2020 19:52:58 +0200
Subject: [PATCH] Initial debian-build-netboot.sh script

---
 debian-build-netboot.sh | 52 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100755 debian-build-netboot.sh

diff --git a/debian-build-netboot.sh b/debian-build-netboot.sh
new file mode 100755
index 0000000..2241b4a
--- /dev/null
+++ b/debian-build-netboot.sh
@@ -0,0 +1,52 @@
+#!/bin/sh
+
+set -e
+set -x
+
+if [ $# -ne 1 ]; then
+	echo "Usage: debian-build-netboot.sh DEBIAN_RELEASE"
+	exit 1
+fi
+
+output_dir=debian-netboot
+release=$1
+date=$(date +%F)
+basename="$release-$date"
+chroot_dir="$output_dir/$basename"
+
+# Cleanup output directory.
+rm -rf $output_dir
+mkdir -p "$chroot_dir"
+
+# Install base system.
+debootstrap "$release" "$chroot_dir"
+echo "unconfigured-host" > "$chroot_dir/etc/hostname"
+
+# Add non-free repository for firmware-bnx2 network card firmware.
+echo "deb http://deb.debian.org/debian/ $release main contrib non-free" > "$chroot_dir/etc/apt/sources.list"
+chroot "$chroot_dir" apt-get update
+chroot "$chroot_dir" apt-get install -y firmware-bnx2
+
+# SSH server, DNS updates from RAs.
+chroot "$chroot_dir" apt-get install -y openssh-server rdnssd
+
+# Install and extract kernel.
+chroot "$chroot_dir" apt-get install -y linux-image-amd64
+cp "$chroot_dir"/boot/vmlinuz-* "$output_dir/kernel-$basename"
+
+# Deploy SSH keys.
+mkdir -p "$chroot_dir/root/.ssh"
+for user in tfloure; do
+	curl "https://meta.recycled.cloud/~$user.keys" >> "$chroot_dir/root/.ssh/authorized_keys"
+done
+
+# Make sure there is /init in the initramfs to avoid kernel panic.
+# initramfs is designed to be PRE regular os, so /init usually hands over to
+# /sbin/init... which are the same in our case.
+ln -fs /sbin/init "$chroot_dir/init"
+
+# Display IP addresses on login screen.
+echo '* * * * * root ip -6 -o addr show | grep -E -v " lo " > /etc/issue' > "$chroot_dir/etc/cron.d/ipv6addr"
+
+# Build initramfs from generated installation.
+(cd "$chroot_dir"; find . | cpio -H newc -o | gzip -9 > "../initramfs-$basename")