nmcli-cli/nmcli-cli-restart at main · jfut/nmcli-cli · GitHub

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#!/bin/bash
#
# nmcli-cli-restart
#
# Copyright (c) 2019-2026 Jun Futagawa (jfut)
#
# This software is released under the MIT License.
# http://opensource.org/licenses/mit-license.php

ECHO_OR_EXECUTE="echo"

print_command() {
    # Print the nmcli command in a reusable shell-quoted form.
    printf '%q' "$1"
    shift
    printf ' %q' "$@"
    printf '\n'
}

echo_or_execute() {
    local RET

    if [[ -z "${ECHO_OR_EXECUTE}" ]]; then
        printf 'Applying: '
        print_command "$@"
        "$@"
        RET=$?
        if [[ ${RET} -ne 0 ]]; then
            echo "Error: command failed (${RET})." >&2
            exit "${RET}"
        fi
    else
        print_command "$@"
    fi
}

usage() {
    cat << _EOF_
Usage:

    $0 [-n] [-x] IF_NAME

    Options:
        -n No interface check (Default: check interface)
        -x Run command (Default: echo only)

    Examples:
        $0 eno1

_EOF_
}

check() {
    local IF_NAME=${1:-}

    # Check interface
    nmcli connection show "${IF_NAME}" > /dev/null 2>&1
    RET=$?
    if [[ ${RET} -ne 0 ]]; then
        echo "Error: Target interface \"${IF_NAME}\" not found."
        exit 1
    fi
}

restart() {
    local IF_NAME=${1:-}
    local NMCLI
    local UNIT_NAME

    # down and up
    # Schedule the recovery before disconnecting the current connection.
    UNIT_NAME="nmcli-cli-restart-up-$$"
    if [[ "${ECHO_OR_EXECUTE}" = "echo" ]]; then
        # Keep command substitution literal so copied output resolves nmcli at runtime.
        # shellcheck disable=SC2016
        printf 'systemd-run --on-active=2s --unit=%q "$(command -v nmcli)" connection up %q\n' "${UNIT_NAME}" "${IF_NAME}"
        echo_or_execute nmcli connection down "${IF_NAME}"
    else
        NMCLI=$(command -v nmcli)
        if [[ -z "${NMCLI}" ]]; then
            echo "Error: nmcli command not found." >&2
            exit 1
        fi

        if ! command -v systemd-run > /dev/null 2>&1; then
            echo "Error: systemd-run command not found." >&2
            exit 1
        fi

        echo_or_execute systemd-run --on-active=2s --unit="${UNIT_NAME}" "${NMCLI}" connection up "${IF_NAME}"
        echo_or_execute nmcli connection down "${IF_NAME}"
    fi
}

# Main
main() {
    local NO_CHECK="no"
    while getopts nxh OPT; do
        case "${OPT}" in
            "n" )
                NO_CHECK="yes" ;;
            "x" )
                ECHO_OR_EXECUTE="" ;;
            "h" )
                usage
                exit 0
                ;;
            * )
                usage
                exit 1
                ;;
        esac
    done
    shift $((OPTIND - 1))

    [[ $# -lt 1 ]] && usage && exit 1

    if [[ "${NO_CHECK}" = "no" ]]; then
        check "${@}"
    fi

    if [[ "${ECHO_OR_EXECUTE}" = "echo" ]]; then
        echo "# ${ECHO_OR_EXECUTE} only."
    fi

    restart "${@}"
}

[[ ${#BASH_SOURCE[@]} = 1 ]] && main "${@}"