我正在为GNOME Shell编写扩展,以检查VPN是否通过此命令连接:
ifconfig -a | grep tun
这是我的extension.js文件:
const St = imports.gi.St;
const Main = imports.ui.main;
const Mainloop = imports.mainloop;
let panelOutput, panelOutputText, timeout;
function panelOutputGenerator(){
// I want to execute this command here and get the result:
// 'ifconfig -a | grep tun'
let commandResult = 'string of result that terminal is returned';
let connectionStatus = (commandResult!='')? 'VPN is Enabled' : 'Normal';
panelOutputText.set_text(connectionStatus);
return true;
}
function init(){
panelOutput = new St.Bin({
style_class: 'panel-button',
reactive: true,
can_focus: false,
x_fill: true,
y_fill: false,
track_hover: false
});
panelOutputText = new St.Label({
text: 'Normal',
style_class: 'iceLabel'
});
panelOutput.set_child(panelOutputText);
}
function enable(){
Main.panel._rightBox.insert_child_at_index(panelOutput,0);
timeout = Mainloop.timeout_add_seconds(1.0,panelOutputGenerator);
}
function disable() {
Mainloop.source_remove(timeout);
Main.panel._rightBox.remove_child(panelOutput);
}
尝试过这些,但没有一个起作用:
const Util = imports.misc.util;
let commandResult = Util.spawn(['/bin/bash', '-c', "ifconfig -a | grep tun"]);
const Util = imports.misc.util;
let commandResult = Util.spawnCommandLine('ifconfig -a | grep tun');
const GLib = imports.gi.GLib;
let [res, out] = GLib.spawn_sync(null,['ifconfig','-a','|','grep','tun'],null,null,null);
et commandResult = res.toString();
我应该怎么执行该命令并获得结果?
我想您可以通过几种方法来做到这一点。通常,我更喜欢GSubprocess
作为我的子进程生成,但是您也可以使用GSubprocess
:
GLib.spawn_command_line_sync()
如果出于某些原因确实要使用const ByteArray = imports.byteArray;
const GLib = imports.gi.GLib;
let [ok, out, err, exit] = GLib.spawn_command_line_sync('ifconfig -a');
if (ByteArray.toString(out).includes('tun')) {
// Do stuff
}
,则可以执行此操作:
grep
只需记住,这些函数中的大多数将返回let [ok, out, err, exit] = GLib.spawn_command_line_sync('/bin/bash -c "ifconfig -a | grep"');
if (out.length > 0) {
// Do stuff
}
。另一方面,GSubprocess具有可以在UTF-8中与子流程进行通信的功能。