From 404454e4ed1cdb0e42af6655796891d8d841b329 Mon Sep 17 00:00:00 2001
From: CHUCK <204468377+drainch@users.noreply.github.com>
Date: Wed, 23 Apr 2025 05:02:51 -0400
Subject: [PATCH] Add PXE boot configuration and scripts

* **PXE boot configuration**: Add `dnsmasq.conf` to configure PXE boot, set TFTP root directory, and configure DHCP options.
* **PXE bootloader configuration**: Add `pxelinux.cfg/default` to configure the PXE bootloader and set the bootloader to point to the macOS KVM kernel/initrd.
* **Serve PXE boot files**: Add `serve_pxe.sh` script to serve `pxelinux.0`, `vmlinuz`, and `initrd` via TFTP using `dnsmasq`.
* **Retrieve internal IP**: Add `get_internal_ip.sh` script to retrieve the internal IP address of the Codespace.
* **Update boot script**: Modify `boot-macOS-headless.sh` to use the PXE boot files from the `netboot` directory and add a network boot option to the QEMU command.
---
 boot-macOS-headless.sh       |  2 ++
 netboot/dnsmasq.conf         | 10 ++++++++++
 netboot/get_internal_ip.sh   |  5 +++++
 netboot/pxelinux.cfg/default |  4 ++++
 netboot/serve_pxe.sh         | 24 ++++++++++++++++++++++++
 5 files changed, 45 insertions(+)
 mode change 100755 => 100644 boot-macOS-headless.sh
 create mode 100644 netboot/dnsmasq.conf
 create mode 100644 netboot/get_internal_ip.sh
 create mode 100644 netboot/pxelinux.cfg/default
 create mode 100644 netboot/serve_pxe.sh

diff --git a/boot-macOS-headless.sh b/boot-macOS-headless.sh
old mode 100755
new mode 100644
index b5ce2e8..d3d938b
--- a/boot-macOS-headless.sh
+++ b/boot-macOS-headless.sh
@@ -67,6 +67,8 @@ args=(
   -device vmware-svga
   -display none
   -vnc 0.0.0.0:1,password=on -k en-us
+  -netdev user,id=pxenet0,tftp=netboot/tftpboot,bootfile=pxelinux.0
+  -device e1000,netdev=pxenet0
 )
 
 qemu-system-x86_64 "${args[@]}"
diff --git a/netboot/dnsmasq.conf b/netboot/dnsmasq.conf
new file mode 100644
index 0000000..86aebff
--- /dev/null
+++ b/netboot/dnsmasq.conf
@@ -0,0 +1,10 @@
+# Configuration for dnsmasq to support PXE boot
+
+# Set the TFTP root directory
+enable-tftp
+tftp-root=/tftpboot
+
+# Configure DHCP options for PXE boot
+dhcp-range=192.168.1.100,192.168.1.200,12h
+dhcp-boot=pxelinux.0
+pxe-service=x86PC, "Install macOS", pxelinux
diff --git a/netboot/get_internal_ip.sh b/netboot/get_internal_ip.sh
new file mode 100644
index 0000000..837034d
--- /dev/null
+++ b/netboot/get_internal_ip.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+# Script to retrieve the internal IP address of the Codespace
+
+hostname -I
diff --git a/netboot/pxelinux.cfg/default b/netboot/pxelinux.cfg/default
new file mode 100644
index 0000000..f28e229
--- /dev/null
+++ b/netboot/pxelinux.cfg/default
@@ -0,0 +1,4 @@
+DEFAULT macOS
+LABEL macOS
+  KERNEL vmlinuz
+  APPEND initrd=initrd.img
diff --git a/netboot/serve_pxe.sh b/netboot/serve_pxe.sh
new file mode 100644
index 0000000..cb42ae6
--- /dev/null
+++ b/netboot/serve_pxe.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+
+# Serve pxelinux.0, vmlinuz, and initrd via TFTP using dnsmasq
+
+# Ensure dnsmasq is installed
+if ! command -v dnsmasq &> /dev/null
+then
+    echo "dnsmasq could not be found, please install it."
+    exit
+fi
+
+# Create tftpboot directory if it doesn't exist
+TFTPBOOT_DIR="tftpboot"
+if [ ! -d "$TFTPBOOT_DIR" ]; then
+    mkdir -p "$TFTPBOOT_DIR"
+fi
+
+# Copy necessary files to tftpboot directory
+cp pxelinux.0 "$TFTPBOOT_DIR/"
+cp vmlinuz "$TFTPBOOT_DIR/"
+cp initrd.img "$TFTPBOOT_DIR/"
+
+# Start dnsmasq to serve PXE boot files
+dnsmasq --conf-file=netboot/dnsmasq.conf