netctl.in

#! /bin/bash

. /usr/lib/netctl/globals


usage() {
    cat << END
Usage: netctl {COMMAND} [PROFILE]
              [--help|--version]

Commands:
  list                   List available profiles
  store                  Save which profiles are active
  restore                Load saved profiles
  stop-all               Stops all profiles
  start [PROFILE]        Start a profile
  stop [PROFILE]         Stop a profile
  restart [PROFILE]      Restart a profile
  switch-to [PROFILE]    Switch to a profile
  is-active [PROFILE]    Check whether a profile is active
  status [PROFILE]       Show runtime status of a profile
  enable [PROFILE]       Enable the systemd unit for a profile
  disable [PROFILE]      Disable the systemd unit for a profile
  reenable [PROFILE]     Reenable the systemd unit for a profile
  is-enabled [PROFILE]   Check whether a profile is enabled
  edit [PROFILE]         Edit a profile file
  verify [PROFILE]       Check the syntax of a profile file
  wait-online [PROFILE]  Wait for a profile to finish connecting
END
}

list() {
    local indicators=( ' ' '+' '*' ) i
    list_profiles | while IFS= read -r Profile; do
        if sd_call "is-active --quiet" "$Profile" &> /dev/null; then
            [[ $(sd_status_text "$Profile") == "online" ]]
            (( i = 2 - $? ))
        else
            (( i = 0 ))
        fi
        printf '%s %s\n' "${indicators[i]}" "$Profile"
    done
}

store() {
    mkdir -p "$(dirname "$STATE_FILE")"
    list_profiles | while IFS= read -r Profile; do
        if sd_call "is-active --quiet" "$Profile" &> /dev/null; then
            printf '%s\n' "$Profile"
        fi
    done > "$STATE_FILE"
}

restore() {
    if [[ ! -r $STATE_FILE ]]; then
        exit_error "Could not read state file '$STATE_FILE'"
    elif [[ ! -s $STATE_FILE ]]; then
        report_debug "No profiles to restore in state file '$STATE_FILE'"
    else
        mapfile -t Profiles < "$STATE_FILE"
        do_debug sd_call start "${Profiles[@]}"
    fi
}

stop_all() {
    # We cannot pipe to mapfile, as the end of a pipe is inside a subshell
    mapfile -t Profiles < <(list_profiles)
    if (( ${#Profiles[@]} )); then
        do_debug sd_call stop "${Profiles[@]}" 2> >(grep -Fv 'not loaded' >&2)
    fi
}

switch_to() {
    Interface=$(. "$PROFILE_DIR/$1" >/dev/null; printf '%s' "$Interface")
    if [[ -z $Interface ]]; then
        exit_error "Profile '$1' does not specify an interface"
    fi
    mapfile -t Profiles < <(filter_profiles "$Interface")
    if (( ${#Profiles[@]} )); then
        do_debug sd_call stop "${Profiles[@]}" 2> >(grep -Fv 'not loaded' >&2)
    fi
    do_debug sd_call start "$1"
}

unit_enable() {
    local unit=$(systemd-escape --template=netctl@.service "$1") target
    load_profile "$1"

    target="@systemdsystemconfdir@/multi-user.target.wants/$unit"
    if [[ -e $target ]]; then
        report_error "The profile '$1' is already enabled"
        return 1
    fi
    do_readable mkdir -p "$(dirname "$target")"
    ln -vs "@systemdsystemunitdir@/netctl@.service" "$target"

    target="@systemdsystemconfdir@/$unit.d/profile.conf"
    do_readable mkdir -p "$(dirname "$target")"
    do_readable touch "$target"
    echo "[Unit]" > "$target"
    if [[ $Description ]]; then
        echo "Description=$Description" >> "$target"
    fi
    declare -p BindsToInterfaces &> /dev/null || BindsToInterfaces=$Interface
    if (( ${#BindsToInterfaces[@]} )); then
        : ${InterfaceRoot=sys/subsystem/net/devices/}
        printf "BindsTo=$(systemd-escape "$InterfaceRoot")%s.device\n" \
               $(systemd-escape "${BindsToInterfaces[@]}") >> "$target"
        printf "After=$(systemd-escape "$InterfaceRoot")%s.device\n" \
               $(systemd-escape "${BindsToInterfaces[@]}") >> "$target"
    fi
    if (( ${#After[@]} )); then
        printf 'After=netctl@%s.service\n' \
               $(systemd-escape "${After[@]}") >> "$target"
    fi
    report_notice "generated '$target'"
}

unit_disable() {
    local unit=$(systemd-escape --template=netctl@.service "$1")
    rm -vfd "@systemdsystemconfdir@"{/multi-user.target.wants,}"/$unit" \
            "@systemdsystemconfdir@/$unit.d"{/profile.conf,}
}

unit_reenable() {
    unit_disable "$1"
    unit_enable "$1"
}

wait_online() {
    local profile="$1"
    if sd_call "is-active --quiet" "$profile"; then
        timeout_wait "${TIMEOUT_ONLINE:-120}" \
                     '[[ $(sd_status_text "$profile") == "online" ]]'
    else
        return 1
    fi
}


case $# in
  1)
    case $1 in
      --version)
        report_notice "netctl version $NETCTL_VERSION";;
      --help)
        usage;;
      list)
        list;;
      store|restore)
        ensure_root "$(basename "$0")"
        "$1";;
      stop-all)
        stop_all;;
      *)
        exit_error "$(usage)";;
    esac;;
  2)
    case $1 in
      start|stop|restart|is-active|status|is-enabled)
        sd_call "$1" "$2";;
      switch-to)
        ensure_root "$(basename "$0")"
        verify_profile "$2"
        switch_to "$2";;
      enable|disable|reenable)
        ensure_root "$(basename "$0")"
        if [[ $1 != "disable" ]]; then
            verify_profile "$2"
        fi
        "unit_$1" "$2"
        if systemd-notify --booted; then
            systemctl daemon-reload
        fi;;
      edit)
        exec ${EDITOR:-nano} "$PROFILE_DIR/$2";;
      verify)
        verify_profile "$2";;
      wait-online)
        wait_online "$2";;
      *)
        exit_error "$(usage)";;
    esac;;
  *)
    exit_error "$(usage)";;
esac


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