Fix preparation of /tftpboot for ironic-pxe

Copy aarch64 snponly.efi to /tftpboot during bootstrapping
of Centos- and Rocky-based ironic-pxe.

Don't use $KOLLA_BASE_ARCH when symlinking to
/tftpboot/ipxe.efi, because an aarch64 variant of this
binary doesn't exist, just x86_64.

Change-Id: Ie19fcb441a2e54a60762e5c8483487b713a29ddd
(cherry picked from commit bb234c6ce8c2ff96691c9fc645ec78d2b26ceddd)

Author: m-bull

docker/ironic/ironic-pxe/extend_start.sh

@@ -51,8 +51,11 @@ function prepare_ipxe {
         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}/
+        cp /usr/share/ipxe/arm64-efi/snponly.efi ${TFTPBOOT_PATH}/ipxe-snponly-aarch64.efi
         if [[ ! -e ${TFTPBOOT_PATH}/ipxe.efi ]]; then
-            ln -s ${TFTPBOOT_PATH}/ipxe-${KOLLA_BASE_ARCH}.efi ${TFTPBOOT_PATH}/ipxe.efi
+            # NOTE(m-anson): No ipxe-aarch64.efi exists so no need to use
+            # $KOLLA_BASE_ARCH in the symlink target
+            ln -s ${TFTPBOOT_PATH}/ipxe-x86_64.efi ${TFTPBOOT_PATH}/ipxe.efi
         fi
         if [[ ! -e ${TFTPBOOT_PATH}/snponly.efi ]]; then
             ln -s ${TFTPBOOT_PATH}/ipxe-snponly-${KOLLA_BASE_ARCH}.efi ${TFTPBOOT_PATH}/snponly.efi

releasenotes/notes/el-aarch64-ipxe-snponly-e7fc23bdc7edfe3d.yaml

@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    Ensure that ipxe-snponly-aarch64.efi is available in
+    /tftpboot in Centos and Rocky after bootstrapping
+    ironic-pxe.
+