process - 生成异步进程不能与pkexec一起使用

我当前的gksudo命令可与Process.spawn_async_with_pipes一起使用。但是，如果我用pkexec切换gksudo，它不会显示pkexec窗口，而是直接完成命令而没有提示，并且什么也不返回。

当我将Process.spawn_command_line_sync与相同的pkexec命令一起使用时，它会提示您输入密码，并且命令可以正常执行并返回结果。

我使用pkexec的关键原因是使用polkit而不提示用户后续使用需要root权限的命令。

我的Process.spawn_async_with_pipes代码的方法如下所示。

我需要如何使pkexec作为后台进程工作的帮助，即提示应阻止gui，但是一旦用户提供了密码，它便应将控制权返回给gui，并在后台继续执行。这正是gksudo发生的情况。

提前致谢

这是异步方法

public int execute_sync_multiarg_command_pipes(string[] spawn_args) {
        debug("Starting to execute async command: "+string.joinv(" ", spawn_args));
        spawn_async_with_pipes_output.erase(0, -1); //clear the output buffer
        MainLoop loop = new MainLoop ();
        try {
            string[] spawn_env = Environ.get();
            Pid child_pid;

            int standard_input;
            int standard_output;
            int standard_error;

            Process.spawn_async_with_pipes ("/",
                spawn_args,
                spawn_env,
                SpawnFlags.SEARCH_PATH | SpawnFlags.DO_NOT_REAP_CHILD,
                null,
                out child_pid,
                out standard_input,
                out standard_output,
                out standard_error);

            // capture stdout:
            IOChannel output = new IOChannel.unix_new (standard_output);
            output.add_watch (IOCondition.IN | IOCondition.HUP, (channel, condition) => {
                return process_line (channel, condition, "stdout");
            });

            // capture stderr:
            IOChannel error = new IOChannel.unix_new (standard_error);
            error.add_watch (IOCondition.IN | IOCondition.HUP, (channel, condition) => {
                return process_line (channel, condition, "stderr");
            });

            ChildWatch.add (child_pid, (pid, status) => {
                // Triggered when the child indicated by child_pid exits
                Process.close_pid (pid);
                loop.quit ();
            });
            loop.run ();
        } catch(SpawnError e) {
            warning("Failure in executing async command ["+string.joinv(" ", spawn_args)+"] : "+e.message);
            spawn_async_with_pipes_output.append(e.message);
        }
        debug("Completed executing async command["+string.joinv(" ", spawn_args)+"]...");
        return 0;
    }`

这就是它的调用方式：

execute_sync_multiarg_command_pipes({"pkexec", COMMAND_USING_SUDO[6]});

最佳答案

生成异步pkexec命令的工作原理是：

public static int main (string[] args) {
    MainLoop loop = new MainLoop ();
    try {
        string[] spawn_args = {"pkexec", "ls", "-l", "-h"};
        string[] spawn_env = Environ.get ();
        Pid child_pid;

        Process.spawn_async ("/",
            spawn_args,
            spawn_env,
            SpawnFlags.SEARCH_PATH | SpawnFlags.DO_NOT_REAP_CHILD,
            null,
            out child_pid);

        ChildWatch.add (child_pid, (pid, status) => {
            // Triggered when the child indicated by child_pid exits
            Process.close_pid (pid);
            loop.quit ();
        });

        loop.run ();
    } catch (SpawnError e) {
        stdout.printf ("Error: %s\n", e.message);
    }
    return 0;
}

出现提示，结果文件列表来自我的“ / root”目录，如预期的那样。

因此问题一定在其他地方。

它也适用于管道：

private static bool process_line (IOChannel channel, IOCondition condition, string stream_name) {
    if (condition == IOCondition.HUP) {
        stdout.printf ("%s: The fd has been closed.\n", stream_name);
        return false;
    }

    try {
        string line;
        channel.read_line (out line, null, null);
        stdout.printf ("%s: %s", stream_name, line);
    } catch (IOChannelError e) {
        stdout.printf ("%s: IOChannelError: %s\n", stream_name, e.message);
        return false;
    } catch (ConvertError e) {
        stdout.printf ("%s: ConvertError: %s\n", stream_name, e.message);
        return false;
    }

    return true;
}

public static int main (string[] args) {
    MainLoop loop = new MainLoop ();
    try {
        string[] spawn_args = {"pkexec", "ls", "-l", "-h"};
        string[] spawn_env = Environ.get ();
        Pid child_pid;

        int standard_input;
        int standard_output;
        int standard_error;

        Process.spawn_async_with_pipes ("/",
            spawn_args,
            spawn_env,
            SpawnFlags.SEARCH_PATH | SpawnFlags.DO_NOT_REAP_CHILD,
            null,
            out child_pid,
            out standard_input,
            out standard_output,
            out standard_error);

        // stdout:
        IOChannel output = new IOChannel.unix_new (standard_output);
        output.add_watch (IOCondition.IN | IOCondition.HUP, (channel, condition) => {
            return process_line (channel, condition, "stdout");
        });

        // stderr:
        IOChannel error = new IOChannel.unix_new (standard_error);
        error.add_watch (IOCondition.IN | IOCondition.HUP, (channel, condition) => {
            return process_line (channel, condition, "stderr");
        });

        ChildWatch.add (child_pid, (pid, status) => {
            // Triggered when the child indicated by child_pid exits
            Process.close_pid (pid);
            loop.quit ();
        });

        loop.run ();
    } catch (SpawnError e) {
        stdout.printf ("Error: %s\n", e.message);
    }
    return 0;
}

即使这样（现在包括您的示例代码片段）也可以工作：

StringBuilder spawn_async_with_pipes_output;

private static bool process_line (IOChannel channel, IOCondition condition, string stream_name) {
    if (condition == IOCondition.HUP) {
        stdout.printf ("%s: The fd has been closed.\n", stream_name);
        return false;
    }

    try {
        string line;
        channel.read_line (out line, null, null);
        stdout.printf ("%s: %s", stream_name, line);
    } catch (IOChannelError e) {
        stdout.printf ("%s: IOChannelError: %s\n", stream_name, e.message);
        return false;
    } catch (ConvertError e) {
        stdout.printf ("%s: ConvertError: %s\n", stream_name, e.message);
        return false;
    }

    return true;
}

public int execute_sync_multiarg_command_pipes(string[] spawn_args) {
        debug("Starting to execute async command: "+string.joinv(" ", spawn_args));
        spawn_async_with_pipes_output.erase(0, -1); //clear the output buffer
        MainLoop loop = new MainLoop ();
        try {
            string[] spawn_env = Environ.get();
            Pid child_pid;

            int standard_input;
            int standard_output;
            int standard_error;

            Process.spawn_async_with_pipes ("/",
                spawn_args,
                spawn_env,
                SpawnFlags.SEARCH_PATH | SpawnFlags.DO_NOT_REAP_CHILD,
                null,
                out child_pid,
                out standard_input,
                out standard_output,
                out standard_error);

            // capture stdout:
            IOChannel output = new IOChannel.unix_new (standard_output);
            output.add_watch (IOCondition.IN | IOCondition.HUP, (channel, condition) => {
                return process_line (channel, condition, "stdout");
            });

            // capture stderr:
            IOChannel error = new IOChannel.unix_new (standard_error);
            error.add_watch (IOCondition.IN | IOCondition.HUP, (channel, condition) => {
                return process_line (channel, condition, "stderr");
            });

            ChildWatch.add (child_pid, (pid, status) => {
                // Triggered when the child indicated by child_pid exits
                Process.close_pid (pid);
                loop.quit ();
            });
            loop.run ();
        } catch(SpawnError e) {
            warning("Failure in executing async command ["+string.joinv(" ", spawn_args)+"] : "+e.message);
            spawn_async_with_pipes_output.append(e.message);
        }
        debug("Completed executing async command["+string.joinv(" ", spawn_args)+"]...");
        return 0;
    }

public static int main (string[] args) {
    spawn_async_with_pipes_output = new StringBuilder ();
    execute_sync_multiarg_command_pipes ({"pkexec", "ls", "-l", "-h"});
    return 0;
}

关于process - 生成异步进程不能与pkexec一起使用，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/40064862/