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如何使用 Xephyr 组成多座位？

tag-icon • tag-icon 11.10 xorg lightdm multiseat
如何使用 Xephyr 组成多座位？

我正在尝试在 Ubuntu 上使用多座席，但无法使其工作。

我读了很多“如何操作”的文章，其中大部分都是关于使用 GDM2 或 KDM 与某些发行版进行多座席协作。但我使用的是 Ubuntu 的 lightdm。

所以现在我尝试使用 Xephyr 来制作这个多座席，我已经用它制作了 Debian 4 版本的多座席。但我不知道如何在 lightdm.conf 中调用 Xephyr。

答案1

这里有一个使用 Xephyr 为多座席设置 LightDM 的示例。看起来 Andrzej Pietrasiewicz（下面复制/引用的博客的作者）创建了一个电力供应协议所有代码如下所示。通过安装该 PPA，您应该能够“神奇地”让 lightdm 安装运行。

笔记：我一直在尝试实现这一点，但还没有成功。不过，我可以告诉你，接下来的内容中存在一些相互矛盾的参数。

一些重要部分：

  1. [Seat:0] 条目定义“硬件服务器”。这将启动 X 服务器。它代表 Display :0
  2. xserver-command 条目明确定义了需要启动哪些内容才能获得席位。Xephyr 以 Display :1 和 Display :2 启动。因此实际上用户将登录 Display :1 和 :2，但不会登录 :0。

类似这样的：

+------------------------------- Display :0 -----------------------------+
|  X server                                                              |
|                                                                        |
|  +--------- Display :1 ----------+  +--------- Display :2 ----------+  |
|  |  Xephyr 1                     |  |  Xephyr 2                     |  |
|  |  User A                       |  |  User B                       |  |
|  |                               |  |                               |  |
|  |                               |  |                               |  |
|  |                               |  |                               |  |
|  +-------------------------------+  +-------------------------------+  |
|                                                                        |
+------------------------------------------------------------------------+

xorg.conf 文件：

# File: /etc/X11/xorg.conf

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    Option         "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "Module"
    Load           "dbe"
    Load           "extmod"
    Load           "type1"
    Load           "freetype"
    Load           "glx"
EndSection

Section "ServerFlags"
    # start even without the mouse
    Option "AllowMouseOpenFail" "yes"
    # disable VT switching
    #Option "DontVTSwitch" "yes"
    # Ctrl+Alt+Backspace disable
    #Option "DontZap" "yes"
EndSection

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Philips 170B4"
    HorizSync       30.0 - 82.0
    VertRefresh     56.0 - 76.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 8400 GS"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "TwinView" "1"
    Option         "TwinViewXineramaInfoOrder" "DFP-0"
    Option         "metamodes" "CRT: nvidia-auto-select +0+1080, DFP: nvidia-auto-select +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

来源：http://beforeafterx.blogspot.com/2011/02/multiseat-setup-xorgconf.html

lightdm.conf中的脚本：

# File: /etc/lightdm/lightdm.conf
[LightDM]
greeter-user=root
user-authority-in-system-dir=false
common-vt=true

[SeatDefaults]
xserver-allow-tcp=false
greeter-hide-users=true
user-session=lightdm-xsession
session-wrapper=/etc/X11/Xsession

[Seat:0]
xserver-command=X -br -dpms -s 0 -novtswitch
greeter-session=xinerama

[Seat:1]
xserver-command=/etc/multiseat/scripts/Xephyr-seat-1
greeter-session=multiseat-greeter-1

[Seat:2]
xserver-command=/etc/multiseat/scripts/Xephyr-seat-2
greeter-session=multiseat-greeter-2

来源：http://beforeafterx.blogspot.com/2012/08/multiseat-setup-lightdmconf.html

多座位脚本使用描述该座位所用鼠标和键盘的参数启动 Xephyr。我会尽力找出这些信息并在此处提供。

#!/bin/bash
# File: /etc/multiseat/scripts/Xephyr-seat1, Xephyr-seat2, ..., Xephyr-seatN
#
# $1 - display number of this Xephyr

. /etc/multiseat/scripts/helper-functions

trap "" usr1

XEPHYR=/root/Xephyr-new
export DISPLAY=:0
export XAUTHORITY=/var/run/lightdm/root/:0

SEAT=1

SIZE=`get_conf $SEAT SIZE`
KEYBOARD=`get_conf $SEAT KEYBOARD`
LAYOUT=`get_conf $SEAT LAYOUT`
MOUSE=`get_conf $SEAT MOUSE`
DPI=`get_conf $SEAT DPI`

exec $XEPHYR -retro -screen ${SIZE} -keybd evdev,,device=/dev/input/${KEYBOARD},xkbrules=evdev,xkbmodel=evdev,xkblayout=${LAYOUT} -mouse evdev,,device=/dev/input/${MOUSE} -dpi ${DPI} $1

来源：http://beforeafterx.blogspot.com/2012/08/multiseat-configuration-xephyr-seat-1.html

lightdm 中引用的 greater 也是一个单独的 shell 脚本。请注意，我建议您引用/bin/sh而不是/bin/bash。我没有看到任何需要 bash 的东西。请注意，它在最后引用了默认的 lightdm-gtk-greeter。

#!/bin/bash
# File: /etc/multiseat/scripts/multiseat-greeter-1, ..., multiseat-greeter-n
#
# multiseat wrapper around ligthdm greeter in order to position a Xephyr instance
#
. /etc/multiseat/scripts/helper-functions

PRIMARY=`get_conf 0 PRIMARY`
SEAT=1

if [ $SEAT != $PRIMARY ]; then
    XEP=`XAUTHORITY=/var/run/lightdm/root/:0 xwininfo -root -children -display :0 | grep "Xephyr on :$SEAT" --max-count=1`;
    XEPHYR_WIN_ID=`echo ${XEP} | cut -d' ' -f1`;
    DISPLACEMENT=`get_conf $SEAT DISPLACEMENT`
    DISPLAY=:0 XAUTHORITY=/var/run/lightdm/root/:0 wmctrl 2>&1 -v -i -r ${XEPHYR_WIN_ID} -e 0,0,${DISPLACEMENT},-1,-1;
fi

XAUTHORITY=/var/run/lightdm/root/:$SEAT
DISPLAY=:$SEAT
exec /usr/sbin/lightdm-gtk-greeter

一些函数可能在以下脚本中定义。不知何故，它还包含另一个我还没有见过的多座席脚本……

# File: /etc/multiscript/scripts/helper-functions

. /etc/default/multiseat

#
# private implementation of get_sect
#
# get given section's contents from the given config file
#
# $1 filename
# $2 section number
#
__get_sect()
{
    cat $1 | awk -v sect=$2 '
    BEGIN {
        SECT="^\\[" sect "\\]"
        NEXT_SECT="^\\[" (sect + 1) "\\]"
    }
    $0 ~ SECT, $0 ~ NEXT_SECT {
        if ($0 ~ SECT)
            next;
        if ($0 ~ NEXT_SECT)
            next;
        if (substr($1, 1, 1) == "#")
            next;
        print
    }
    '
}

#
# private implementation of get_conf
#
# get given key's contents from the given section
# from the given config file
#
# does not work for tables in the config file
#
# $1 filename
# $2 section name
# $3 key name
#
__get_conf()
{
    __get_sect $1 $2 | awk -F"=" -v key=$3 '
    BEGIN {
        KEY=key
    }
    $1==KEY {
        print substr($0, index($0, "=") + 1)
    }
    '
}

#
# private implementation of get_num_seats
#
# get number of seats from the default config file
#
# $1 filename
#
__get_num_seats()
{
    cat $1 | awk '
    BEGIN {
        count=0
    }
    /^\[[0-9]*\]/ {count++}
    END {
        print count - 1
    }
    '
}

#
# get given section's contents from the default config file
#
# $1 section name
#
get_sect()
{
    __get_sect $CONFIG $1
}

#
# private implementation of get_table
#
# $1 filename
# $2 section number
# $3 table name
# $4 size/entry switch [-size => size, <number> for entry]
#
__get_table()
{
    SIZE=0;
    ENTRY=-1

    if [ $4 == "-size" ];
    then
        SIZE=1;
    else
        ENTRY=$4
    fi

    RESULT=`__get_sect $1 $2 | awk -v table=$3 -v get_size=$SIZE -v entry=$ENTRY '
    BEGIN {
        print BEGIn
        TABLE=table "\\\=" "\\\("
        GET_SIZE=get_size
        ENTRY=entry
        size=0
    }
    $0 ~ TABLE, /^\)/ {
        if ($0 ~ TABLE)
            next;
        if ($0 ~ /^\)/)
            next;
        if (substr($1, 1, 1) == "#")
            next;
        if (get_size == 0 && size == entry){
                print
                exit
        }
        size++;
    }
    END {
        if (get_size)
            print size;
    }
    '`
    RESULT=`echo $RESULT | sed 's/^[ \t]*//g'`

    echo $RESULT
}

#
# get given key's contents from the given section
# from the default config file
#
# does not work for tables in the config file
#
# $1 section name
# $2 key name
#
get_conf()
{
    __get_conf $CONFIG $1 $2
}

#
# get number of seats from the default config file
#
get_num_seats()
{
    __get_num_seats $CONFIG
}

#
# get size of a given table in the given section of the config file or
# get specified entry of the table
#
# $1 section number
# $2 table name
# $3 size/entry switch [-size => size, <number> for entry]
#
get_table()
{
    __get_table $CONFIG $1 $2 $3
}

fake-greeter 脚本处于休眠状态。它只是休眠，直到被完全关闭杀死。显然，这不是必需的。根据评论，该-noreset选项足以避免这样的等待。我稍后会亲自测试后报告。

#!/bin/bash
# File: /etc/multiseat/scripts/fake-greeter

pid_set=0

kill_sleep()
{
    if [ $pid_set -ne 0 ];
    then
        kill -15 $pid
    fi
    exit 0
}

trap 'kill_sleep' TERM

while true;
do
    sleep 1000 &

    pid=$!
    pid_set=1

    wait $pid
done

同一博客说他在使用 udev 时遇到了问题，他必须重置它才能使多座席正常工作。这是 2012 年 8 月的事，所以我不知道这在 2014 年是否仍然适用。

#!/bin/sh
# File: /etc/init.d/multiseat
### BEGIN INIT INFO
# Provides:          multiseat
# Required-Start:    bootlogs
# Required-Stop:
# Default-Start:     1 2 3 4 5
# Default-Stop:
# Short-Description: Trigger udev rules
# Description:       For some reason the rules for multiseat config need to be
#                    fired once more and later than at the very beginning.
### END INIT INFO

/sbin/udevadm trigger

要在您的系统上正确设置此脚本，请运行以下命令：

sudo update-rc.d multiseat defaults

再次强调，我不知道这个脚本是否是必需的。只是整理了之前 之后 X。

来源：http://beforeafterx.blogspot.com/2012/08/multiseat-setup-initdmultiseat.html

答案2

尝试 xrdp 这将是最简单的解决方案。我安装了 vnc4server，然后安装了 xrdp。然后我使用 rdesktop / tsclient / remmina 使用 IP 地址连接 xrdp 机器。

答案3

有一个很棒的博客详细介绍了基于 Xephyr 的多座席设置过程。他还在使用 Lightdm。希望对您有所帮助。

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