fix: mac-specific ipxe file was missing #!ipxe sheban causing bad exec format. Also added autofree to chainloading boot file so it won't cause kernel panics when fallback boots after a failed boot of a previous file

harmony/templates/boot.ipxe.j2

@@ -31,7 +31,7 @@ sleep 2
 # 1. iPXE attempts to 'chain' the hostfile.
 # 2. If successful (returns 0), the "&& exit" part is executed, and this script terminates.
 # 3. If it fails (returns non-zero), the "||" part is triggered, and execution continues below.
-chain ${hostfile} && exit ||
+chain --autofree --replace ${hostfile} && exit ||
 
 # --- Fallback Boot Attempt ---
 # This part of the script is only reached if the 'chain ${hostfile}' command above failed.
@@ -45,7 +45,7 @@ echo "    Location: ${fallbackfile}"
 
 sleep 8
 
-chain ${fallbackfile} && exit ||
+chain --autofree --replace ${fallbackfile} && exit ||
 
 # --- Final Failure ---
 # This part is only reached if BOTH chain commands have failed.

harmony/templates/okd/bootstrap.ipxe.j2

@@ -1,7 +1,52 @@
-set base-url http://{{ http_ip }}:8080
+#!ipxe
-set scos-base-url = ${base-url}/{{ scos_path }}
-set installation-device = {{ installation_device }}
 
-kernel ${scos-base-url}/scos-live-kernel.x86_64 initrd=main coreos.live.rootfs_url=${scos-base-url}/scos-live-rootfs.x86_64.img coreos.inst.install_dev=${installation-device} coreos.inst.ignition_url=${base-url}/{{ ignition_http_path }}/bootstrap.ign  
+# ==================================================================
-initrd --name main ${scos-base-url}/scos-live-initramfs.x86_64.img 
+#    MAC-Specific Boot Script for CoreOS/FCOS Installation
-boot
+# ==================================================================
+
+# --- Configuration ---
+set http_ip {{ http_ip }}
+set scos_path {{ scos_path }}
+set inst_dev {{ installation_device }}
+set ign_path {{ ignition_http_path }}
+set ign_file bootstrap.ign
+
+# --- Derived Variables ---
+set base-url http://${http_ip}:8080
+set scos-base-url ${base-url}/${scos_path}
+set ignition-url ${base-url}/${ign_path}/${ign_file}
+
+# --- Pre-boot Logging & Verification ---
+echo
+echo "Starting MAC-specific installation..."
+echo "--------------------------------------------------"
+echo "  Installation Device: ${inst_dev}"
+echo "  CoreOS Kernel URL:   ${scos-base-url}/scos-live-kernel.x86_64"
+echo "  Ignition URL:        ${ignition-url}"
+echo "--------------------------------------------------"
+echo "Waiting for 3 seconds before loading boot assets..."
+sleep 3
+
+# --- Load Boot Assets with Failure Checks ---
+# The '|| goto failure' pattern provides a clean exit if any asset fails to load.
+echo "Loading kernel..."
+kernel ${scos-base-url}/scos-live-kernel.x86_64 initrd=main coreos.live.rootfs_url=${scos-base-url}/scos-live-rootfs.x86_64.img coreos.inst.install_dev=${inst_dev} coreos.inst.ignition_url=${ignition-url} || goto failure
+
+echo "Loading initramfs..."
+initrd --name main ${scos-base-url}/scos-live-initramfs.x86_64.img || goto failure
+
+# --- Boot ---
+echo "All assets loaded successfully. Starting boot process..."
+boot || goto failure
+
+# This part is never reached on successful boot.
+
+# --- Failure Handling ---
+:failure
+echo
+echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+echo "  ERROR: A boot component failed to load."
+echo "  Dropping to iPXE shell for manual debugging."
+echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+sleep 10
+shell