incus-os/scripts/update-image

#!/bin/sh -eu
if [ -z "${1:-}" ] || [ -z "${2:-}" ]; then
    echo "Usage: ${0} VERSION NAME"
    exit 1
fi

# Check if instance exists
if ! incus info "${2}" >/dev/null 2>&1; then
    echo "Instance ${2} doesn't exist"
    exit 1
fi

# Setup temporary directory
TEMPDIR=$(mktemp -d)
cleanup() {
    rm -Rf "${TEMPDIR}"
}
trap cleanup EXIT HUP INT TERM

# Grab the image
echo "=> Downloading the image"
echo "==> Getting image metadata"
JSON_RELEASE="$(curl -sL "https://api.github.com/repos/lxc/incus-os/releases/tags/${1}")"
ARTIFACTS="$(echo "${JSON_RELEASE}" | jq -r ".assets | .[].browser_download_url")"

for URL in ${ARTIFACTS}; do
    FILENAME="$(echo "${URL}" | sed "s#.*/##g")"

    [ "${FILENAME}" = "IncusOS_${1}.raw.gz" ] && continue

    echo "==> Downloading ${FILENAME}"
    curl -sL "${URL}" | gzip -d > "${TEMPDIR}/$(echo "${FILENAME}" | sed "s/.gz$//g")"
done

# Uploading the update
echo "=> Uploading the update"

incus file create "${2}/var/lib/updates/" --type=directory
incus file push --quiet "${TEMPDIR}/"* "${2}/var/lib/updates/"
incus exec "${2}" -- mv /var/lib/updates/debug.raw /var/lib/extensions/
incus exec "${2}" -- mv /var/lib/updates/incus.raw /var/lib/extensions/

incus exec "${2}" -- systemctl start boot.mount
incus exec "${2}" -- unshare -m -- sh -c "mount /dev/mapper/usr /usr && /usr/lib/systemd/systemd-sysupdate && /usr/lib/systemd/systemd-sysupdate update && /usr/lib/systemd/systemd-sysupdate && /usr/lib/systemd/systemd-sysupdate reboot"

while :; do
  sleep 3
  incus exec "${2}" -- /usr/bin/true >/dev/null 2>&1 && break
done

incus exec "${2}" -- systemctl daemon-reload
incus exec "${2}" -- systemctl enable --now incus-lxcfs incus-startup incus incus.socket

# Done
echo ""
echo "Instance ${2} is now running Incus OS (${1})"