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opensd_reload_udev()
{
    # Reload and trigger udev rules after being installed or updated
    printf "%s" "Reloading udev rules..."
    if udevadm control --reload-rules; then
        printf "%s\n" "OK"
    else
        printf "%s\n" "ERROR"
    fi

    printf "%s" "Triggering udev rules..."
    if udevadm trigger; then
        printf "%s\n" "OK"
    else
        printf "%s\n" "ERROR"
    fi
}

opensd_add_group()
{
    # OpenSD group for udev rules
    local group="opensd"
    # Get actual current user, ignoring sudo
    local curr_user="${SUDO_USER:-$USER}"

    # Make sure we're root/sudo
    if [ "$(id -u)" -ne 0 ]; then 
        printf "%s\n" "This script needs to be run with sudo."
        exit 1
    fi

    # If opensd group does not exist, create it
    if ! getent group opensd 2>&1 > /dev/null; then
        printf "%s" "Adding '${group}' group..."
        if groupadd "${group}"; then
            printf "%s\n" "OK"
        else
            printf "%s\n" "ERROR"
        fi
    else 
        printf "%s\n" "${group} group already exists."
    fi

    # Check if user is already a member of opensd group
    if ! groups "${curr_user}" | grep "${group}" 2>&1 > /dev/null; then
        printf "%s" "Adding user ${curr_user} to '${group}' group..."
        if usermod -aG opensd "${curr_user}"; then
            printf "%s\n" "OK"
        else
            printf "%s\n" "ERROR"
        fi
        
        printf "\n%s\n" "You may need to logout for these changes to take effect."
    else
        printf "%s\n" "${curr_user} is already a member of the ${group} group."
    fi
}

opensd_reload_sysd()
{
    # Get actual current user, ignoring sudo
    local curr_user="${SUDO_USER:-$USER}"

    # If systemctl does not exist, assume we're not using systemd
    if ! command -v systemctl 2>&1 > /dev/null; then
        printf "%s\n" "Cannot find systemctl."
        printf "%s\n" "This system does not appear to use systemd.  Skipping reload."
    else
        printf "%s" "Reloading systemd user rules..."
        # Reloads systemd user rules.  Can be run directly as user OR with sudo.
        if systemctl --user -M "${curr_user}@" daemon-reload; then
            printf "%s\n" "OK"
        else
            printf "%s\n" "ERROR"
        fi
    fi
}

post_install() 
{
    opensd_reload_udev
    opensd_add_group
    opensd_reload_sysd
    
    printf "\n"
    printf "%s\n"   "  If you're new to OpenSD, check out the online documentation"
    printf "%s\n"   "  at  https://opensd.codeberg.page  or the offline"
    printf "%s\n"   "  documentation in /usr/share/doc/opensd/users_manual.html" 
    printf "%s\n"   "  A manpage is also available: Type 'man opensdd'"
    printf "\n"
}

post_upgrade() 
{
    opensd_reload_udev
    opensd_add_group
    opensd_reload_sysd

    printf "%s\n"   "See /usr/share/doc/opensd/CHANGELOG.md for changes in this version."
}