#!/bin/bash

OS_CODENAME=focal
OS_VERSION=20.04


function get_streams()
{
    streams="$(mktemp)"
    wget -qO "$streams" https://images.maas.io/ephemeral-v3/stable/streams/v1/com.ubuntu.maas:stable:v3:download.json
}

function get_latest_maas_id()
{
    if [ ! -f "$streams" ]; then
        return 1
    fi
    release_version=$(jq -r '.products[]|select(.version=="'"$OS_VERSION"'" and .arch=="amd64" and .kflavor=="generic" and .subarch=="ga-'"$OS_VERSION"'")|.versions|keys|max' \
        "$streams")
}

function get_checksum()
{
    local release_version="$1"
    local filename="$2"
    checksum=$(jq -r '.products[]|select(.version=="'"$OS_VERSION"'" and .arch=="amd64" and .kflavor=="generic" and .subarch=="ga-'"$OS_VERSION"'").versions."'"$release_version"'".items."'"$filename"'".sha256' \
        "$streams")
}

function remove_version()
{
    local version="$1"

}

function download_and_verify()
{
    local url="$1"
    local checksum="$2"
    local fname="$3"

    wget "$url" -O "$fname"
    sha256sum=$(sha256sum "$fname")
    if [ "$sha256sum" == "$checksum" ]; then
        return 0
    fi
    return 1
}

function cleanup_temp()
{
    if [ -f "$streams" ]; then
        rm -f "$streams"
    fi
}

function download_files()
{
    download kernel
    download initrd
    download squashfs

    dd if=squashfs of="$partition" bs=1M

    create_options_file
    update_default
    delete_oldest_if_needed
    update_onerror_second_youngest
}

# vim: set ft=sh: