#!/bin/sh

DEBSYSTEMCTL=$(command -v deb-systemd-invoke || echo systemctl)

after_upgrade() {
    if command -v systemctl >/dev/null; then
        systemctl --system daemon-reload >/dev/null || true

        if ! systemctl is-enabled fake-proxmox-subscription.timer >/dev/null; then
            # Ensure this if-clause is not empty.
            # If it was empty, and we had an 'else', then it is an error in shell syntax.
            systemctl preset fake-proxmox-subscription.timer >/dev/null || true
            $DEBSYSTEMCTL start fake-proxmox-subscription.timer >/dev/null || true

        else
            $DEBSYSTEMCTL restart fake-proxmox-subscription.timer >/dev/null || true

        fi

    else
        ln -sf /usr/bin/fake-proxmox-subscription /etc/cron.hourly/fake-proxmox-subscription

    fi

    # Execute the fake-proxmox-subscription script:
    fake-proxmox-subscription
}

after_install() {
    if command -v systemctl >/dev/null; then
        systemctl --system daemon-reload >/dev/null || true
        systemctl preset fake-proxmox-subscription.timer >/dev/null || true
        $DEBSYSTEMCTL start fake-proxmox-subscription.timer >/dev/null || true

    else
        ln -sf /usr/bin/fake-proxmox-subscription /etc/cron.hourly/fake-proxmox-subscription

    fi

    # Execute the fake-proxmox-subscription script:
    fake-proxmox-subscription
}

if { [ "${1}" = "configure" ] && [ -z "${2}" ]; } || [ "${1}" = "abort-remove" ]; then
    # "after install" here
    # "abort-remove" happens when the pre-removal script failed.
    #   In that case, this script, which should be idemptoent, is run
    #   to ensure a clean roll-back of the removal.
    after_install

elif [ "${1}" = "configure" ] && [ -n "${2}" ]; then
    UPGRADEDFROMVERSION="${2}"
    # "after upgrade" here
    # NOTE: This slot is also used when deb packages are removed,
    # but their config files aren't, but a newer version of the
    # package is installed later, called "Config-Files" state.
    # basically, that still looks a _lot_ like an upgrade to me.
    after_upgrade "${2}"

elif echo "${1}" | grep -E -q "(abort|fail)"; then
    echo "Failed to install before the post-installation script was run." >&2
    exit 1

fi