Node / rns-mirrors / Reticulum-Go.git / files / microvm / fetch-kernel.sh

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#!/usr/bin/env bash

# Download a Firecracker CI guest kernel into microvm/out/vmlinux.

#

# Usage:

# ./microvm/fetch-kernel.sh

# KERNEL_SERIES=6.1 ./microvm/fetch-kernel.sh

set -euo pipefail

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

OUT="${ROOT}/out"

mkdir -p "${OUT}"

ARCH="$(uname -m)"

case "${ARCH}" in

x86_64 | aarch64) ;;

arm64) ARCH=aarch64 ;;

*)

echo "unsupported arch: ${ARCH}" >&2

exit 1

;;

esac

S3="https://s3.amazonaws.com/spec.ccfc.min"

KERNEL_SERIES="${KERNEL_SERIES:-6.1}"

echo "listing Firecracker CI artifact prefixes"

PREFIXES_XML="$(curl -fsSL "${S3}?list-type=2&prefix=firecracker-ci/&delimiter=/")"

# Prefer dated CI builds (YYYYMMDD-...), newest last.

CI_PREFIX="$(printf '%s\\n' "${PREFIXES_XML}" \\

| grep -oE 'firecracker-ci/[0-9]{8}-[^/<]+/' \\

| sort \\

| tail -n1 || true)"

if [[ -z "${CI_PREFIX}" ]]; then

echo "no dated firecracker-ci prefixes found" >&2

exit 1

fi

echo "using prefix ${CI_PREFIX}${ARCH}/"

KEYS_XML="$(curl -fsSL "${S3}?list-type=2&prefix=${CI_PREFIX}${ARCH}/vmlinux-")"

# Match bare object keys only (no trailing punctuation from XML tags).

mapfile -t ALL_KEYS < <(printf '%s\\n' "${KEYS_XML}" \\

| grep -oE "${CI_PREFIX}${ARCH}/vmlinux-[0-9]+\\.[0-9]+\\.[0-9]+" \\

| sort -V \\

| uniq)

if [[ "${#ALL_KEYS[@]}" -eq 0 ]]; then

echo "no vmlinux keys under ${CI_PREFIX}${ARCH}/" >&2

exit 1

fi

LATEST_KEY=""

for key in "${ALL_KEYS[@]}"; do

base="$(basename "${key}")"

case "${base}" in

vmlinux-${KERNEL_SERIES}.*)

LATEST_KEY="${key}"

;;

esac

done

if [[ -z "${LATEST_KEY}" ]]; then

LATEST_KEY="${ALL_KEYS[-1]}"

echo "no vmlinux-${KERNEL_SERIES}.* found, falling back to ${LATEST_KEY}"

fi

DEST="${OUT}/vmlinux"

TMP="${DEST}.partial"

echo "downloading ${S3}/${LATEST_KEY}"

curl -fL --progress-bar -o "${TMP}" "${S3}/${LATEST_KEY}"

mv -f "${TMP}" "${DEST}"

chmod a-w "${DEST}" || true

printf '%s\\n' "${LATEST_KEY}" >"${OUT}/vmlinux.source"

echo "wrote ${DEST}"

ls -lh "${DEST}"