sysdeploy/syslinux-menu.inc

#!/bin/bash

. syslinux.inc
. drive.inc
imagepath='/os/focal-maas'

function update_syslinux_menu()
{
    local drive="$1"
    declare -A versions
    declare -a files

    files=('boot-kernel.' 'boot-initrd.')

    mount_efi "$drive"

    find_newest "$drive"

    > "$mnt"/syslinux/items.cfg
    if [ -n "$newest" ]; then
        version_from_partnum "$drive" "$newest"
        echo "DEFAULT cloud-init-$version" >> "$mnt"/syslinux/items.cfg
    fi

    partition_list "$drive"
    for part in $partitions; do
        version_from_partnum "$drive" "$part"
        if [ -z "$version" ]; then
            continue
        fi
        versions["$version"]=1
        missing=""
        for f in "${files[@]}"; do
            if [ ! -e "$mnt""$imagepath"/"$f""$version" ]; then
                missing="1"
            fi
        done
        if [ -n "$missing" ]; then
            continue
        fi
        cat >> "$mnt"/syslinux/items.cfg << _EOL_

LABEL cloud-init-$version
MENU LABEL Ubuntu focal (MAAS $version)
KERNEL $imagepath/boot-kernel.$version
APPEND initrd=$imagepath/boot-initrd.$version root=PARTLABEL="root_$version" ip=dhcp overlayroot=tmpfs:recurse=0 ds=nocloud-net;s=https://box.sysdeploy.org/cloud-init/
_EOL_
    done

    # find expired
    for f in "${files[@]}"; do
        for i in "$mnt""$imagepath"/"$f"*; do
            version="$(basename "$i"|cut -d. -f2-)"
            if [ -z "${versions[$version]}" ]; then
                rm -f $i
            fi
        done
    done

    umount_efi
}

# vim: set ft=sh: