From 6a8805346f73c93048bf57922f82626b34baef16 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mika=C3=ABl=20Cluseau?= <mikael.cluseau@gmail.com>
Date: Fri, 5 Jun 2026 14:10:37 +0200
Subject: [PATCH] add example (but useful) dhcp initrd

---
 build-dhcp-initrd | 62 +++++++++++++++++++++++++++++++++++++++++++++++
 dhcp/config.yaml  | 37 ++++++++++++++++++++++++++++
 2 files changed, 99 insertions(+)
 create mode 100755 build-dhcp-initrd
 create mode 100644 dhcp/config.yaml

diff --git a/build-dhcp-initrd b/build-dhcp-initrd
new file mode 100755
index 0000000..7713527
--- /dev/null
+++ b/build-dhcp-initrd
@@ -0,0 +1,62 @@
+#! /bin/bash
+
+base_initrd=dist/initrd
+flavor=dhcp
+dir=tmp/$flavor-initrd
+
+dist=dist/$flavor
+uki=$dist/bootx64.efi
+
+linux_v=6.18.34
+
+set -ex
+
+mkdir -p tmp/dl $dist
+
+linux=tmp/dl/linux-$linux_v
+modules=tmp/dl/modules-$linux_v
+
+[ -e $linux ]   || curl -o $linux   https://dkl.novit.io/dist/kernels/6.18.34
+[ -e $modules ] || curl -o $modules https://dkl.novit.io/dist/layers/modules/6.18.34 # TODO .erofs
+
+rm -fr $dir
+mkdir $dir
+
+cpio --quiet --extract --file $base_initrd --directory $dir
+
+cp -rv $flavor/. $dir
+cp $modules $dir/modules.fs
+
+(cd $dir && find * |cpio --create -H newc -R 0:0) >$dir.cpio
+
+if cpio -tF $dir.cpio 2>&1 |grep bytes.of.junk; then echo "bad cpio archive"; exit 1; fi
+
+zstd -12 -T0 -vf $dir.cpio &&
+mv $dir.cpio.zst $dist/initrd
+cp $linux $dist/vmlinuz
+
+ukify build --output $uki --os-release "Direktil DHCP" \
+    --linux $linux --initrd $dist/initrd --cmdline "console=tty0 console=ttyS0,115200"
+
+MB=$(( 2**20 ))
+sz=$(( ( $(stat -c %s $uki) + MB ) / MB + 2 ))
+
+efi=$dist/efi.img
+
+if [ -e $efi ]; then rm $efi; fi
+
+truncate -s ${sz}M $efi
+sgdisk -n 1:2048:0 -t 1:ef00 -c 1:"EFI System" $efi
+
+offset=$(( 2048 * 512 ))
+
+export MTOOLSRC=$(mktemp)
+trap "rm -f $MTOOLSRC" exit
+echo "drive e: file=\"$efi\" offset=$offset" >$MTOOLSRC
+
+args="-i $efi@@$offset"
+
+mformat -F e:
+mmd e:EFI e:EFI/BOOT
+mcopy $uki e:EFI/BOOT/BOOTX64.EFI
+
diff --git a/dhcp/config.yaml b/dhcp/config.yaml
new file mode 100644
index 0000000..1ea94e2
--- /dev/null
+++ b/dhcp/config.yaml
@@ -0,0 +1,37 @@
+---
+anti_phishing_code: "direktil<3"
+
+modules: /modules.fs
+
+auths:
+  - name:     adm1@novit
+    sshKey:   ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICkpbU6sf4t0f6XAv9DuW3XH5iLM0AI5rc8PT2jwea1N
+  - name:     adm2@novit
+    sshKey:   ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAILIomzqVAIqb7BedauhAo2VgbLqme5Jx/vjGUqZLoJqF
+
+ssh:
+  listen: "[::]:22"
+
+networks:
+- name: loopback
+  interfaces: [ { var: iface, n: 1, udev: !eq [INTERFACE, lo] } ]
+  script: |
+    ip a add 127.0.0.1/8 dev lo
+    ip a add ::1/128 dev lo
+    ip li set lo up
+- name: main
+  interfaces:
+  - var: iface
+    n: -1
+    udev: !has ID_NET_NAME_MAC
+  script: |
+    ip link add main type bond mode active-backup
+    for l in $ifaces; do
+      ip link set $l master main
+      ip link set $l up
+    done
+    ip link set main up
+    udhcpc -b -i main
+
+bootstrap:
+  dev: /dev/storage/bootstrap