Pseudo code

.travis.yml

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+---
+script:
+  - test.sh

install.sh

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+#!/bin/bash
+
+function setup_bootloader()
+{
+    local dev="$1"
+    check_if_can_overwrite
+    check_if_mounted_or_used_in_lvm_md_crypt
+    wipe_or_nvme_format
+    parted mklabel gpt
+    parted mkpart 1GB EFI
+    parted mkpart 1GB squashfs-1
+    parted mkpart 1GB squashfs-2
+    parted mkpart 1GB squashfs-3
+
+    dd gptmbr.bin
+    mkfs.vfat "$dev"1
+    syslinux "$dev"1
+    mount
+    copy_efi_files
+    create_syslinux_cfg
+    umount
+}
+
+detect_disks
+select_disk

syslinux.cfg.legacy

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+LABEL EFI
+CONFIG syslnx64.cfg
+APPEND /EFI/BOOT

update-boot-files.sh

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+#!/bin/bash
+
+OSCODENAME=focal
+OSVERSION=20.04
+
+function find_oldest()
+{
+    echo
+}
+
+function get_latest_maas_id()
+{
+    jq blah $OSCODENAME
+}
+
+function get_checksum()
+{
+    jq blah $OSVERSION
+}
+
+function download_and_verify()
+{
+    local url="$1"
+    local checksum="$2"
+    local fname="$3"
+
+    wget "$url" -O "$fname"
+    if [ "checksum" == "$checksum" ]; then
+        return 0
+    fi
+    return 1
+}
+
+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
+}