#!/bin/sh
# Download and install the latest cloud-hypervisor + ch-remote static binaries.
set -eu

API="https://api.github.com/repos/cloud-hypervisor/cloud-hypervisor/releases/latest"

# Pick the asset matching this architecture.
case "$(uname -m)" in
    x86_64|amd64)
        ch_asset="cloud-hypervisor-static"
        chremote_asset="ch-remote-static"
        ;;
    aarch64|arm64)
        ch_asset="cloud-hypervisor-static-aarch64"
        chremote_asset="ch-remote-static-aarch64"
        ;;
    *)
        echo "unsupported architecture: $(uname -m)" >&2
        exit 1
        ;;
esac

echo "fetching latest cloud-hypervisor release metadata"
if ! RESPONSE=$(curl -fsSL "$API"); then
    echo "FAILED TO QUERY CLOUD-HYPERVISOR RELEASES API" >&2
    exit 1
fi

HYPERVISOR_URL=$(printf '%s' "$RESPONSE" | jq -r --arg n "$ch_asset" \
    '.assets[] | select(.name == $n) | .browser_download_url')
CH_REMOTE_URL=$(printf '%s' "$RESPONSE" | jq -r --arg n "$chremote_asset" \
    '.assets[] | select(.name == $n) | .browser_download_url')

if [ -z "$HYPERVISOR_URL" ] || [ "$HYPERVISOR_URL" = "null" ] \
    || [ -z "$CH_REMOTE_URL" ] || [ "$CH_REMOTE_URL" = "null" ]; then
    echo "FAILED TO RESOLVE DOWNLOAD URLS (asset missing for $(uname -m)?)" >&2
    exit 1
fi

# install_bin <url> <dest>
install_bin() {
    _url="$1"; _dest="$2"
    echo "downloading $_url"
    if ! curl -fsSL -o "$_dest" "$_url"; then
        echo "FAILED TO DOWNLOAD $_url" >&2
        exit 1
    fi
    chmod +x "$_dest"
}

install_bin "$HYPERVISOR_URL" /usr/bin/cloud-hypervisor
install_bin "$CH_REMOTE_URL" /usr/bin/ch-remote

# Sanity-check the binaries actually run on this platform.
if ! /usr/bin/cloud-hypervisor --version >/dev/null 2>&1; then
    echo "cloud-hypervisor is not executable (wrong arch?)" >&2
    exit 1
fi
if ! /usr/bin/ch-remote --version >/dev/null 2>&1; then
    echo "ch-remote is not executable (wrong arch?)" >&2
    exit 1
fi

echo "cloud-hypervisor installed"