Add support for aarch64 ipxe to ironic-pxe image

Support aarch64 ipxe only when using Ubuntu and Rocky
Linux base images, as the Debian ipxe package does not
provide a suitable aarch64 ipxe binary.

Change-Id: If5610148fc80acf13d4eb79fef78349764f08a17
(cherry picked from commit 16b3223)

Author: m-bull

docker/ironic/ironic-pxe/Dockerfile.j2

@@ -14,6 +14,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
         'grub2-efi-*64',
         'grub2-efi-aa64-modules',
         'ipxe-bootimgs',
+        'ipxe-bootimgs-aarch64',
         'mtools',
         'shim-*64',
         'tftp-server',

docker/ironic/ironic-pxe/extend_start.sh

@@ -43,7 +43,12 @@ function prepare_ipxe {
     # was ipxe.efi. Ensure that both exist, using symlinks where the files are
     # named differently to allow the original names to be used in ironic.conf.
     if [[ "${KOLLA_BASE_DISTRO}" =~ debian|ubuntu ]]; then
-        cp /usr/lib/ipxe/{undionly.kpxe,ipxe.efi,snponly.efi} ${TFTPBOOT_PATH}/
+        # NOTE(m-anson): ipxe-arm64.efi is not symlinked from /boot to
+        # /usr/lib/ipxe by the Ubuntu ipxe package, so fix that here.
+        if [[ -e /boot/ipxe-arm64.efi ]]; then
+            ln -s /boot/ipxe-arm64.efi /usr/lib/ipxe/
+        fi
+        cp /usr/lib/ipxe/{undionly.kpxe,ipxe*.efi,snponly.efi} ${TFTPBOOT_PATH}/
     elif [[ "${KOLLA_BASE_DISTRO}" =~ centos|rocky ]]; then
         cp /usr/share/ipxe/{undionly.kpxe,ipxe*.efi} ${TFTPBOOT_PATH}/
         if [[ ! -e ${TFTPBOOT_PATH}/ipxe.efi ]]; then

releasenotes/notes/aarch64-ipxe-51888a5972528d77.yaml

@@ -0,0 +1,9 @@
+---
+features:
+  - |
+    Adds aarch64 iPXE support to the ironic-pxe image, by adding
+    ``ipxe-bootimgs-aarch64`` RPM package to Rocky Linux ironic-pxe
+    images, and ensuring that an aarch64 iPXE binary is available
+    in Ubuntu ironic-pxe images. No support for aarch64 iPXE in
+    Debian images is included, as the distro packages do not
+    install an aarch64 binary.