smart-os/xfce4.md
2022-10-02 10:08:46 +08:00

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单独运行 xfce4 组件 不编译 smart-os, 单独编译 xfce4

  1. 利用 wmare 安装 Ubuntu 18.04 Server 版本,安装完毕,配置 apt 源ssh 等操作,就不要再做过多的操作了,尽量保持系统纯净
  2. 修订 common.sh 文件里面的 with_xfce_test=true
  3. ./mk_xfce.sh 进行 xfce4 的编译,编译完毕会自动生成 startxfce.sh
  4. 重启系统,重启完毕。在 wmware 虚拟机里面执行 startxfce.sh 就可以成功拉起桌面了 运行效果图如下
    avatar

xfce4 组件介绍

  • [ Gtk+ ] 这些组件 gtk 最庞大
    libffi
    libmount
    glib
    pixman
    freetype
    harfbuzz
    fontconfig
    cairo
    fribidi
    pango
    gdkpixbuf
    libeproxy
    graphene
    wayland-protocols
    gettext( libintl )
    gtk+
  • [ xfce ] 这些组件编译顺序也有要求
    libwnck
    xfce4-dev-tools
    xlibxfce4util
    xfconf
    libxfce4ui
    garcon
    exo
    xfce4-panel
    thunar xfce4-settings
    xfce4-session
    xfwm4
    xfdesktop
    thunar-volman
    tumbler
    xfce4-power-manager
    xfce4-appfinder

Cairo

cairo is a vector graphics library with cross-device output support
cairo能够做各种复杂的点线图案绘制、填充、文字渲染、图像变换、剪切、层混合等等操作。但是他没有涉及到用户交互如鼠标、touch、事件处理交互窗口这些统统没有他只有专一的绘图。他有surface可以理解为画布这个surface可以是基于内存image surface必选的surface也可以基于某种backend和操作系统或驱动接口对接使用过程是创建一个surface然后在surface里做各种绘图最后使用Painting类的functions时图像就显示在了surface上。当然surface也是一块image可以把image通过png源码有对接libpng库图像压缩输出png文件

harfbuzz

HarfBuzz 是一个文本整形引擎。它主要支持OpenType但也 支持Apple Advanced Typography。HarfBuzz 用于 Android、Chrome、ChromeOS、Firefox、GNOME、GTK+、KDE、LibreOffice、OpenJDK、PlayStation、Qt、XeTeX 等地方。

xfce 运行黑屏怎么办

比如黑屏,我们由屏幕想到可能是 xfdesktop 这个应用负责渲屏,黑屏可能是 xfdesktop 未能正确运行,这个就需要我们手工调试跟踪了,通常情况下我们会这么做:

# 设置屏幕,这个是 xfce 默认的值 10
export DISPLAY=:10
# 执行这个,正常执行理论上就不会黑屏,不能执行,可能是依赖库路径不对,版本不对,配置不对,逐步根据提示解决问题
xfdesktop

xrdp 远程访问 linux 桌面流程分析( 重要

  1. xrdp 服务依赖 xrdp-sesman 服务 我们可以通过 grep 全局查找 xrdp-sesman发现下面这句
./lib/systemd/system/xrdp.service:4:Requires=xrdp-sesman.service

因此 xrdp 启动时,肯定 xrdp-sesman 也相应启动,具体机制待研究(TODO)

  1. 配置文件 /etc/xrdp/sesman.ini
[Globals]
ListenAddress=127.0.0.1
ListenPort=3350
  1. 确认 xrdp 和 xrdp-sesman 服务
root@freeabc:/# netstat -anpt | grep xrdp
tcp6       0      0 :::3389                 :::*                    LISTEN      6288/xrdp           
tcp6       0      0 ::1:3350                :::*                    LISTEN      6259/xrdp-sesman

其中 xrdp 是 3389 对外提供服务, xrdp-sesman 是 3350 对 xrdp 提供服务xrdp 把请求转给 xrdp-sesman (经过 tcpdump 抓包确认是)

root@freeabc:/# tcpdump -s 0 -i lo port 3350 -v -n
tcpdump: listening on lo, link-type EN10MB (Ethernet), capture size 262144 bytes
01:37:24.538435 IP6 (flowlabel 0xc281a, hlim 64, next-header TCP (6) payload length: 40) ::1.52600 > ::1.3350: Flags [S], cksum 0x0030 (incorrect -> 0x3f1d), seq 213438096, win 65476, options [mss 65476,sackOK,TS val 4262615841 ecr 0,nop,wscale 7], length 0
01:37:24.538457 IP6 (flowlabel 0xe10b3, hlim 64, next-header TCP (6) payload length: 40) ::1.3350 > ::1.52600: Flags [S.], cksum 0x0030 (incorrect -> 0xbea4), seq 3363004107, ack 213438097, win 65464, options [mss 65476,sackOK,TS val 4262615841 ecr 4262615841,nop,wscale 7], length 0
01:37:24.538472 IP6 (flowlabel 0xc281a, hlim 64, next-header TCP (6) payload length: 32) ::1.52600 > ::1.3350: Flags [.], cksum 0x0028 (incorrect -> 0xe53a), ack 1, win 512, options [nop,nop,TS val 4262615841 ecr 4262615841], length 0
01:37:25.149700 IP6 (flowlabel 0xc281a, hlim 64, next-header TCP (6) payload length: 109) ::1.52600 > ::1.3350: Flags [P.], cksum 0x0075 (incorrect -> 0x6a7f), seq 1:78, ack 1, win 512, options [nop,nop,TS val 4262616452 ecr 4262615841], length 77
01:37:25.149734 IP6 (flowlabel 0xe10b3, hlim 64, next-header TCP (6) payload length: 32) ::1.3350 > ::1.52600: Flags [.], cksum 0x0028 (incorrect -> 0xe028), ack 78, win 511, options [nop,nop,TS val 4262616452 ecr 4262616452], length 0
01:37:25.216918 IP6 (flowlabel 0xe10b3, hlim 64, next-header TCP (6) payload length: 62) ::1.3350 > ::1.52600: Flags [P.], cksum 0x0046 (incorrect -> 0xd13d), seq 1:31, ack 78, win 512, options [nop,nop,TS val 4262616519 ecr 4262616452], length 30
01:37:25.216969 IP6 (flowlabel 0xc281a, hlim 64, next-header TCP (6) payload length: 32) ::1.52600 > ::1.3350: Flags [.], cksum 0x0028 (incorrect -> 0xdf83), ack 31, win 512, options [nop,nop,TS val 4262616519 ecr 4262616519], length 0
01:37:25.254713 IP6 (flowlabel 0xe10b3, hlim 64, next-header TCP (6) payload length: 32) ::1.3350 > ::1.52600: Flags [F.], cksum 0x0028 (incorrect -> 0xdf5c), seq 31, ack 78, win 512, options [nop,nop,TS val 4262616557 ecr 4262616519], length 0
01:37:25.297973 IP6 (flowlabel 0xc281a, hlim 64, next-header TCP (6) payload length: 32) ::1.52600 > ::1.3350: Flags [.], cksum 0x0028 (incorrect -> 0xdf0b), ack 32, win 512, options [nop,nop,TS val 4262616600 ecr 4262616557], length 0
01:37:25.886713 IP6 (flowlabel 0xc281a, hlim 64, next-header TCP (6) payload length: 32) ::1.52600 > ::1.3350: Flags [F.], cksum 0x0028 (incorrect -> 0xdcbd), seq 78, ack 32, win 512, options [nop,nop,TS val 4262617189 ecr 4262616557], length 0
01:37:25.886737 IP6 (flowlabel 0xc429c, hlim 64, next-header TCP (6) payload length: 32) ::1.3350 > ::1.52600: Flags [.], cksum 0x0028 (incorrect -> 0xda45), ack 79, win 512, options [nop,nop,TS val 4262617189 ecr 4262617189], length 0
01:37:41.603074 IP6 (flowlabel 0x461f5, hlim 64, next-header TCP (6) payload length: 32) ::1.46136 > ::1.3350: Flags [F.], cksum 0x0028 (incorrect -> 0x23fc), seq 3577026672, ack 1112127163, win 512, options [nop,nop,TS val 4262632906 ecr 4262596309], length 0
01:37:41.603101 IP6 (flowlabel 0xeaed7, hlim 64, next-header TCP (6) payload length: 32) ::1.3350 > ::1.46136: Flags [.], cksum 0x0028 (incorrect -> 0x9506), ack 1, win 512, options [nop,nop,TS val 4262632906 ecr 4262632906], length 0

我们也可以利用 journalctl -xf 查看日志

Aug 18 01:45:02 freeabc xrdp[10507]: (10507)(139797313210176)[INFO ] Socket 12: AF_INET6 connection received from ::ffff:192.168.222.1 port 56030
Aug 18 01:45:02 freeabc xrdp[10507]: (10507)(139797313210176)[DEBUG] Closed socket 12 (AF_INET6 ::ffff:192.168.222.178 port 3389)
Aug 18 01:45:02 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] Closed socket 11 (AF_INET6 :: port 3389)
Aug 18 01:45:03 freeabc xrdp[10687]: (10687)(139797313210176)[INFO ] Using default X.509 certificate: /etc/xrdp/cert.pem
Aug 18 01:45:03 freeabc xrdp[10687]: (10687)(139797313210176)[INFO ] Using default X.509 key file: /etc/xrdp/key.pem
Aug 18 01:45:03 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] TLSv1.2 enabled
Aug 18 01:45:03 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] TLSv1.1 enabled
Aug 18 01:45:03 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] TLSv1 enabled
Aug 18 01:45:03 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] Security layer: requested 11, selected 1
Aug 18 01:45:03 freeabc xrdp[10687]: (10687)(139797313210176)[INFO ] connected client computer name: DESKTOP-9PAUEP4
Aug 18 01:45:03 freeabc xrdp[10687]: (10687)(139797313210176)[INFO ] TLS connection established from ::ffff:192.168.222.1 port 56030: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384
Aug 18 01:45:03 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] xrdp_000029bf_wm_login_mode_event_00000001
Aug 18 01:45:03 freeabc xrdp[10687]: (10687)(139797313210176)[INFO ] Cannot find keymap file /etc/xrdp/km-00000804.ini
Aug 18 01:45:03 freeabc xrdp[10687]: (10687)(139797313210176)[INFO ] Cannot find keymap file /etc/xrdp/km-00000804.ini
Aug 18 01:45:03 freeabc xrdp[10687]: (10687)(139797313210176)[INFO ] Loading keymap file /etc/xrdp/km-00000409.ini
Aug 18 01:45:03 freeabc xrdp[10687]: (10687)(139797313210176)[WARN ] local keymap file for 0x00000804 found and doesn't match built in keymap, using local keymap file
Aug 18 01:45:03 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] xrdp_wm_log_msg: connecting to sesman ip 127.0.0.1 port 3350
Aug 18 01:45:03 freeabc xrdp-sesman[10471]: (10471)(140145709626688)[INFO ] A connection received from ::1 port 36482
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[INFO ] xrdp_wm_log_msg: sesman connect ok
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] xrdp_wm_log_msg: sending login info to session manager, please wait...
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] return value from xrdp_mm_connect 0
Aug 18 01:45:04 freeabc xrdp-sesman[10471]: (10471)(140145709626688)[INFO ] ++ created session (access granted): username root, ip ::ffff:192.168.222.1:56030 - socket: 12
Aug 18 01:45:04 freeabc xrdp-sesman[10471]: (10471)(140145709626688)[INFO ] starting Xorg session...
Aug 18 01:45:04 freeabc xrdp-sesman[10471]: (10471)(140145709626688)[DEBUG] Closed socket 9 (AF_INET6 :: port 5911)
Aug 18 01:45:04 freeabc xrdp-sesman[10471]: (10471)(140145709626688)[DEBUG] Closed socket 9 (AF_INET6 :: port 6011)
Aug 18 01:45:04 freeabc xrdp-sesman[10471]: (10471)(140145709626688)[DEBUG] Closed socket 9 (AF_INET6 :: port 6211)
Aug 18 01:45:04 freeabc xrdp-sesman[10688]: (10688)(140145709626688)[INFO ] calling auth_start_session from pid 10688
Aug 18 01:45:04 freeabc xrdp-sesman[10471]: (10471)(140145709626688)[DEBUG] Closed socket 8 (AF_INET6 ::1 port 3350)
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[INFO ] xrdp_wm_log_msg: login successful for display 11
Aug 18 01:45:04 freeabc xrdp-sesman[10688]: pam_unix(xrdp-sesman:session): session opened for user root by (uid=0)
Aug 18 01:45:04 freeabc systemd-logind[1076]: New session c15 of user root.
-- Subject: A new session c15 has been created for user root
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
-- Documentation: https://www.freedesktop.org/wiki/Software/systemd/multiseat
-- 
-- A new session with the ID c15 has been created for the user root.
-- 
-- The leading process of the session is 10688.
Aug 18 01:45:04 freeabc systemd[1]: Started Session c15 of user root.
-- Subject: Unit session-c15.scope has finished start-up
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
-- 
-- Unit session-c15.scope has finished starting up.
-- 
-- The start-up result is RESULT.
Aug 18 01:45:04 freeabc xrdp-sesman[10688]: (10688)(140145709626688)[DEBUG] Closed socket 7 (AF_INET6 ::1 port 3350)
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] xrdp_wm_log_msg: started connecting
Aug 18 01:45:04 freeabc xrdp-sesman[10688]: (10688)(140145709626688)[DEBUG] Closed socket 8 (AF_INET6 ::1 port 3350)
Aug 18 01:45:04 freeabc xrdp-sesman[10690]: (10690)(140145709626688)[INFO ] /usr/lib/xorg/Xorg :11 -auth .Xauthority -config xrdp/xorg.conf -noreset -nolisten tcp -logfile .xorgxrdp.%s.log
Aug 18 01:45:04 freeabc xrdp-sesman[10688]: (10688)(140145709626688)[CORE ] waiting for window manager (pid 10689) to exit
Aug 18 01:45:04 freeabc systemd[1487]: Started GnuPG cryptographic agent and passphrase cache.
-- Subject: Unit UNIT has finished start-up
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit UNIT has finished starting up.
--
-- The start-up result is RESULT.
Aug 18 01:45:04 freeabc gpg-agent[10760]: gpg-agent (GnuPG) 2.2.4 starting in supervised mode.
Aug 18 01:45:04 freeabc gpg-agent[10760]: using fd 3 for ssh socket (/run/user/0/gnupg/S.gpg-agent.ssh)
Aug 18 01:45:04 freeabc gpg-agent[10760]: using fd 4 for extra socket (/run/user/0/gnupg/S.gpg-agent.extra)
Aug 18 01:45:04 freeabc gpg-agent[10760]: using fd 5 for std socket (/run/user/0/gnupg/S.gpg-agent)
Aug 18 01:45:04 freeabc gpg-agent[10760]: using fd 6 for browser socket (/run/user/0/gnupg/S.gpg-agent.browser)
Aug 18 01:45:04 freeabc gpg-agent[10760]: listening on: std=5 extra=4 browser=6 ssh=3
Aug 18 01:45:04 freeabc kernel: xfce4-session[10742]: segfault at 2c ip 0000556e4a4fe8c6 sp 00007ffedc54cd30 error 4 in xfce4-session[556e4a4d2000+45000]
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[INFO ] lib_mod_log_peer: xrdp_pid=10687 connected to X11rdp_pid=10690 X11rdp_uid=0 X11rdp_gid=0 client_ip=::ffff:192.168.222.1 client_port=56030
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] xrdp_wm_log_msg: connected ok
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] xrdp_mm_connect_chansrv: chansrv connect successful
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] Closed socket 20 (AF_INET6 ::1 port 36482)
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[INFO ] The following channel is allowed: rdpdr (0)
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[INFO ] The following channel is allowed: rdpsnd (1)
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[INFO ] The following channel is allowed: cliprdr (2)
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[INFO ] The following channel is allowed: drdynvc (3)
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] The allow channel list now initialized for this session
Aug 18 01:45:04 freeabc xrdp-sesman[10688]: (10688)(140145709626688)[CORE ] window manager (pid 10689) did exit, cleaning up session
Aug 18 01:45:04 freeabc xrdp-sesman[10688]: (10688)(140145709626688)[INFO ] calling auth_stop_session and auth_end from pid 10688
Aug 18 01:45:04 freeabc xrdp-sesman[10688]: pam_unix(xrdp-sesman:session): session closed for user root
Aug 18 01:45:04 freeabc xrdp-sesman[10688]: (10688)(140145709626688)[DEBUG] cleanup_sockets:
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] Closed socket 22 (AF_UNIX)
Aug 18 01:45:04 freeabc xrdp-sesman[10688]: (10688)(140145709626688)[DEBUG] cleanup_sockets: deleting /var/run/xrdp/sockdir/xrdp_chansrv_audio_out_socket_11
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] Closed socket 12 (AF_INET6 ::ffff:192.168.222.178 port 3389)
Aug 18 01:45:04 freeabc xrdp-sesman[10688]: (10688)(140145709626688)[DEBUG] cleanup_sockets: deleting /var/run/xrdp/sockdir/xrdp_chansrv_audio_in_socket_11
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] xrdp_mm_module_cleanup
Aug 18 01:45:04 freeabc xrdp[10687]: (10687)(139797313210176)[DEBUG] Closed socket 21 (AF_UNIX)
Aug 18 01:45:04 freeabc xrdp-sesman[10688]: (10688)(140145709626688)[DEBUG] cleanup_sockets: deleting /var/run/xrdp/sockdir/xrdpapi_11
Aug 18 01:45:04 freeabc xrdp-sesman[10471]: (10471)(140145709626688)[INFO ] ++ terminated session:  username root, display :11.0, session_pid 10688, ip ::ffff:192.168.222.1:56030 - socket: 12
Aug 18 01:45:14 freeabc systemd-logind[1076]: Removed session c15.
-- Subject: Session c15 has been terminated

这个日志可以看到更清楚的流程,具体日志见上 我们看到这个没启动起来是 xfce4-session[10742]: segfault at 2c ip 0000556e4a4fe8c6 sp 00007ffedc54cd30 error 4 in xfce4-session[556e4a4d2000+45000] 有段错误 这个错误,我们可以单独运行 xfce4-session 查看原因

xfwm4-Message: 02:00:03.303: Another Window Manager (Xfwm4) is already running on screen :10.0
xfwm4-Message: 02:00:03.303: To replace the current window manager, try "--replace"
(xfwm4:11384): xfwm4-WARNING **: 02:00:03.303: Could not find a screen to manage, exiting

我们看到是另外一个 Xfwn4 已经启动在 screen :10.0 了,可以运行 xfwm4 --replace 替换一下 对用户的授权,我们通过日志可以观察到是通过文件 ~/.Xauthority

  1. xrdp-sesman 会根据 sesman.ini 调用 /etc/xrdp/startwm.sh这个脚本最终会调用 /etc/X11/Xsession 这个脚本, Xsession 这个脚本大有文章
SYSSESSIONDIR=/etc/X11/Xsession.d
USERXSESSION=$HOME/.xsession  ---> 看到没有这就是我们经常看到的很多文章推荐的 echo "xfce4-session" > ~/.xsession 的原因,设置 Xsession 的环境变量
...
SESSIONFILES=$(run-parts --list $SYSSESSIONDIR)  ---> 最终会执行 /etc/X11/Xsession.d 下的脚本,我们所有的窗口会话实现,应该放到这个里面

if [ -n "$SESSIONFILES" ]; then
  set +e
  for SESSIONFILE in $SESSIONFILES; do
    echo $SESSIONFILES >> /root/my.log
    . $SESSIONFILE
  done
  set -e
fi

/etc/X11/Xsession.d/20dbus_xdg-runtime /etc/X11/Xsession.d/20x11-common_process-args /etc/X11/Xsession.d/30x11-common_xresources /etc/X11/Xsession.d/35x11-common_xhost-local /etc/X11/Xsession.d/40x11-common_xsessionrc /etc/X11/Xsession.d/50x11-common_determine-startup /etc/X11/Xsession.d/60x11-common_localhost /etc/X11/Xsession.d/60x11-common_xdg_path /etc/X11/Xsession.d/75dbus_dbus-launch /etc/X11/Xsession.d/90gpg-agent /etc/X11/Xsession.d/90qt-a11y /etc/X11/Xsession.d/90x11-common_ssh-agent /etc/X11/Xsession.d/95dbus_update-activation-env /etc/X11/Xsession.d/99x11-common_start

参数 STARTUP 赋值 我们看到执行 /etc/X11/Xsession.d/50x11-common_determine-startup 时,会 STARTUP="$shell $STARTUPFILE" 其实就是 /bin/bash /root/.xsession , root就是 ~ 我们用 root 登录的。

参数 STARTUP 运行 我们跟踪执行 /etc/X11/Xsession.d/99x11-common_start/99x11-common_start 时exec $STARTUP 这个其实就是执行 xfce4-session 了,至此 xfce4-session 启动完成

xfce4-session 会读取 下面的文件,并执行里面的命令 https://manpages.ubuntu.com/manpages/xenial/man1/xfce4-session.1.html
xfce4-session reads its configuration from Xfconf. xfce4-session stores its session data into $XDG_CACHE_HOME/sessions/.

具体配置文件就是 /usr/local/etc/xdg/xfce4/xfconf/xfce-perchannel-xml/xfce4-session.xml

<?xml version="1.0" encoding="UTF-8"?>
<channel name="xfce4-session" version="1.0">
  <property name="general" type="empty">
    <property name="FailsafeSessionName" type="string" value="Failsafe"/>
    <property name="LockCommand" type="string" value=""/>
  </property>
  <property name="sessions" type="empty">
    <property name="Failsafe" type="empty">
      <property name="IsFailsafe" type="bool" value="true"/>
      <property name="Count" type="int" value="5"/>
      <property name="Client0_Command" type="array">
        <value type="string" value="xfwm4"/>
      </property>
      <property name="Client0_Priority" type="int" value="15"/>
      <property name="Client0_PerScreen" type="bool" value="false"/>
      <property name="Client1_Command" type="array">
        <value type="string" value="xfsettingsd"/>
      </property>
      <property name="Client1_Priority" type="int" value="20"/>
      <property name="Client1_PerScreen" type="bool" value="false"/>
      <property name="Client2_Command" type="array">
        <value type="string" value="xfce4-panel"/>
      </property>
      <property name="Client2_Priority" type="int" value="25"/>
      <property name="Client2_PerScreen" type="bool" value="false"/>
      <property name="Client3_Command" type="array">
        <value type="string" value="Thunar"/>
        <value type="string" value="--daemon"/>
      </property>
      <property name="Client3_Priority" type="int" value="30"/>
      <property name="Client3_PerScreen" type="bool" value="false"/>
      <property name="Client4_Command" type="array">
        <value type="string" value="xfdesktop"/>
      </property>
      <property name="Client4_Priority" type="int" value="35"/>
      <property name="Client4_PerScreen" type="bool" value="false"/>
    </property>
  </property>
</channel>

我们看到一个会话启动五个最基本的服务 xfwm4, xfsettingsd, xfce4-panel, Thunar, xfdesktop如果启动失败请依次排查这几个服务是否正常 如果只出状态栏和 Dock ,桌面出现黑屏,基本上是 xfdesktop 启动失败,可能依赖的库不满足,缺少什么库,这个需要具体问题具体分析了。 进程关系如下图

systemd--
        |-xrdp---xrdp
        |-xrdp-sesman---xrdp-sesman---Xorg---9*[{Xorg}]
                                    |-bash---ssh-agent
                                    |      |-xfce4-session---Thunar---2*[{Thunar}]
                                    |                      |-xfce4-panel---panel-14-action---2*[{panel-14-action}]
                                    |                      |             |-panel-6-systray---2*[{panel-6-systray}]
                                    |                      |             |-panel-9-power-m---2*[{panel-9-power-m}]
                                    |                      |             |-2*[{xfce4-panel}]
                                    |                      |-xfce4-power-man---2*[{xfce4-power-man}]
                                    |                      |-xfdesktop---2*[{xfdesktop}]
                                    |                      |-xfsettingsd---2*[{xfsettingsd}]
                                    |                      |-xfwm4---2*[{xfwm4}]
                                    |                      |-10*[{xfce4-session}]
                                    |-xrdp-chansrv---{xrdp-chansrv}

Xorg 就是我们通常说的 xserver, 有关整个流程的调试,我们可以用下述命令进行错误排除

env LD_LIBRARY_PATH="/root/test/build/test/a/usr/lib:/root/test/build/test/a/usr/local/lib:/root/test/build/test/a/usr/lib/x86_64-linux-gnu:/root/test/build/test/a/opt/libjpeg-turbo/lib64" DBUS_SESSION_BUS_ADDRESS="unix:path=/var/run/dbus/session_bus_socket" strace -f xrdp-sesman -n

基本上 xrdp-sesman 会启动 Xorg ( xserver ), Xorg 会通过 tcp 或 Unix socket 与 xclient 进行通讯;还会启动 xsession, 还会启动 xrdp-chansrv从上述我们可以得知这些组件都必须启动成功否则就会看不到图像界面。我们通过 strace -f 跟踪得知 xrdp-sesman 是通过接口 execve 启动的 Xorg ,这个接口执行后,来自父进程的环境变量将会被清除,导致 LD_LIBRARY_PATH 失效,因此 Xorg 所依赖的动态库就找不到,解决方法就是把库直接拷贝到系统库的位置,就行,比如:

cp /root/smart-os/build/test/a/usr/lib/x86_64-linux-gnu/libharfbuzz.so.0 /usr/lib/x86_64-linux-gnu/

常见问题解决方法

  1. 解决 Fontconfig error: Cannot load default config file: No such file cp /root/test/a/usr/local/etc/* /usr/local/etc/ -rf

  2. 解决 Cannot read private key file /etc/xrdp/key.pem: Permission denied

    adduser xrdp ssl-cert
    reboot
    
  3. 解决 libpango 库多版本的环境下,系统的低版本优先加载,导致 xfdesktop 不能正常启动的问题我们可以这么做

    libdir=`pwd`"/a/usr"
    echo "LD_LIBRARY_PATH=\"${libdir}/lib:${libdir}/local/lib:${libdir}/lib/x86_64-linux-gnu\" xfce4-session" > ~/.xsession
    

    这样就可以优先加载我们编译的动态库了

  4. xfce4-session 其实相应的配置也可以通过命令行工具查看 xfconf-query -c xfce4-session -p /sessions/Failsafe/Client3_Command 我们可以逐行查看每个属性,然后通过 ps -aef | grep xf* 查看相应的进程是否正确启动,如果没有启动,就会导致出现问题,然后单独手工启动那个进程,查看是什么原因导致不能正常启动的,解决问题就非常简单了。

  5. xfdesktop 启动时提示Settings schema 'org.gtk.Settings.FileChooser' is not installed
    方法apt install libgtk-3-common

  6. xfce4 编译后,启动远程桌面,发现面板上相应的 item 都没有图标,进入文件管理器,对应的文件也没有图标,只显示文字,需要安装
    方法apt install gnome-icon-theme当然这两个问题只装 libgtk-3-common 都可以解决

  7. 编译 libxi 库时,会提示下面的错误,我们去官方网站去看 发现 inputproto 项目已经被废弃,怎么办?

    configure: error: Package requirements (xproto >= 7.0.13 x11 >= 1.6 xextproto >= 7.0.3 xext >= 1.0.99.1 inputproto >= 2.3.99.1) were not met:
    Requested 'inputproto >= 2.3.99.1' but version of InputProto is 2.3.2
    

    方法其实现在这些inputproto都被合并到项目 xorgproto 里面了,编译这个库就行了,这个问题折腾我好久

  8. 编译 libx11 遇到问题

    checking keysym definitions... configure: error: /usr/local/include/X11 doesn't exist or isn't a directory
    

    方法: --with-keysymdefdir="${xfce_install}/usr/local/include/X11"

  9. 编译 pciaccess, libxcb-util 遇到问题

    error: must install xorg-macros 1.8 or later before running autoconf/autogen
    error: must install xorg-macros 1.16.0 or later before running autoconf/autogen
    

    方法: 原因就是 aclocal 的路径设置的不完全

    export ACLOCAL="aclocal -I /usr/share/aclocal -I ${xfce_share}/aclocal -I ${xfce_loc_share}/aclocal"
    
  10. 我们利用 xrdp 远程访问 xfce 桌面黑屏,查看日志 .xsession-errors发现提示下述错误

    (xfce4-session:1904): xfce4-session-WARNING **: 11:23:52.330: ICE connection 0x55b030d772e0 rejected
    (xfwm4:1942): xfwm4-WARNING **: 11:23:52.330: Failed to connect to session manager: Failed to connect to the session manager: Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed
    (xfce4-session:1904): xfce4-session-WARNING **: 11:24:00.217: ICE connection 0x55b030ddb520 rejected
    Failed to connect to session manager: Failed to connect to the session manager: Authentication Rejected, reason : None of the authen
    tication protocols specified are supported and host-based authentication failed
    

    我们进一步追踪journalctl -xf

    Aug 28 11:30:52 freeabc xrdp[2172]: (2172)(139849385854784)[INFO ] Using default X.509 key file: /etc/xrdp/key.pem
    Aug 28 11:30:52 freeabc xrdp[2172]: (2172)(139849385854784)[ERROR] Cannot read private key file /etc/xrdp/key.pem: Permission denied
    Aug 28 11:30:52 freeabc xrdp[2172]: (2172)(139849385854784)[DEBUG] TLSv1.2 enabled
    Aug 28 11:30:52 freeabc xrdp[2172]: (2172)(139849385854784)[DEBUG] TLSv1.1 enabled
    Aug 28 11:30:52 freeabc xrdp[2172]: (2172)(139849385854784)[DEBUG] TLSv1 enabled
    Aug 28 11:30:52 freeabc xrdp[2172]: (2172)(139849385854784)[DEBUG] Security layer: requested 11, selected 0
    Aug 28 11:30:52 freeabc xrdp[2172]: (2172)(139849385854784)[DEBUG] Closed socket 12 (AF_INET6 ::ffff:192.168.1.101 port 3389)
    Aug 28 11:30:52 freeabc xrdp[1289]: (1289)(139849385854784)[INFO ] Socket 12: AF_INET6 connection received from ::ffff:192.168.1.105 port 11281
    Aug 28 11:30:52 freeabc xrdp[1289]: (1289)(139849385854784)[DEBUG] Closed socket 12 (AF_INET6 ::ffff:192.168.1.101 port 3389)
    Aug 28 11:30:52 freeabc xrdp[2173]: (2173)(139849385854784)[DEBUG] Closed socket 11 (AF_INET6 :: port 3389)
    Aug 28 11:30:52 freeabc xrdp[2173]: (2173)(139849385854784)[INFO ] Using default X.509 certificate: /etc/xrdp/cert.pem
    Aug 28 11:30:52 freeabc xrdp[2173]: (2173)(139849385854784)[INFO ] Using default X.509 key file: /etc/xrdp/key.pem
    Aug 28 11:30:52 freeabc xrdp[2173]: (2173)(139849385854784)[ERROR] Cannot read private key file /etc/xrdp/key.pem: Permission denied
    

    我们看到是 key.pem 的权限不允许导致的, sudo adduser xrdp ssl-cert 重启系统,这个问题解决

  11. 如果我们运行 xsession 提示 Can't open display 即使我们设置环境变量 export DISPLAY=:10 ,也是这个提示,引起这个问题的原因有很多,但我们首先第一步要做的是要检查 Xorg( xserver ) 服务在不在,一般情况通常会忽略这个检查

  12. Xorgxserver 启动时,提示错误

    Using system config directory "/usr/local/share/X11/xorg.conf.d"
    MESA-LOADER: failed to open vmwgfx (search paths /usr/lib/x86_64-linux-gnu/dri)
    failed to load driver: vmwgfx
    MESA-LOADER: failed to open kms_swrast (search paths /usr/lib/x86_64-linux-gnu/dri)
    failed to load driver: kms_swrast
    MESA-LOADER: failed to open swrast (search paths /usr/lib/x86_64-linux-gnu/dri)
    failed to load swrast driver
    couldn't get display device
    

    解决:缺失显卡驱动
    apt install libgl1-mesa-dri

  13. Xorgxserver启动时提示错误

    XKB: Failed to compile keymap
    Keyboard initialization failed. This could be a missing or incorrect setup of xkeyboard-config.
    (EE) 
    Fatal server error:
    (EE) Failed to activate virtual core keyboard: 2(EE) 
    (EE) 
    

    解决: ln -s /usr/share/X11/xkb /usr/local/share/X11/xkb
    这样再运行 Xorg 就可以正常运行了。

  14. failed to load driver: swrast

    LD_LIBRARY_PATH="/root/smart-os/build/test/a/usr/lib:/root/smart-os/build/test/a/usr/local/lib:/root/smart-os/build/test/a/usr/lib/x86_64-linux-gnu:/root/smart-os/build/test/a/opt/libjpeg-turbo/lib64" xfwm4
    MESA-LOADER: failed to open swrast (search paths /usr/lib/x86_64-linux-gnu/dri)
    libGL error: failed to load driver: swrast
    

    解决:
    apt install libgl1-mesa-dri

  15. 我们的 upower.service 运行依赖我们编译的 glib 库,系统自带的 glib 版本有点低,我们为 systemd 的服务单元增加环境变量,才能让 unit 正确运行
    因此我们需要编辑 vi /lib/systemd/system/upower.service

    [Service]
    Type=dbus
    BusName=org.freedesktop.UPower
    ExecStart=/usr/libexec/upowerd
    Restart=on-failure
    Environment="LD_LIBRARY_PATH=/root/smart-os/build/test/a/usr/lib:/root/smart-os/build/test/a/usr/local/lib:/root/smart-os/build/test/a/usr/lib/x86_64-linux-gnu:/root/smart-os/build/test/a/opt/libjpeg-turbo/lib64"
    
  16. 通过 systemctl start upower.service ,启动会被系统强杀 SIGSYS ( syscall=12 )apport.log 会提示下面的错误

    ERROR: apport (pid 3268) Thu Sep 15 10:25:01 2022: host pid 3257 crashed in a separate mount namespace, ignoring
    

    journalctl -xf 会提示下面的错误

    Sep 15 10:25:01 freeabc kernel: [ 5505.813250] audit: type=1326 audit(1663237501.505:66): auid=4294967295 uid=0 gid=0 ses=4294967295 pid=3300 comm="upowerd" 
    exe="/usr/local/bin/upowerd" sig=31 arch=c000003e syscall=12 compat=0 ip=0x7f40bfa9c0a9 code=0x0
    

    单独执行 /usr/libexec/upowerd -v ,也能成功执行。这个问题让我困惑了好久,目前找到解决方法了;我们需要做的是把 upower.service 里面的几句话注释掉即可

    # System call interfaces
    LockPersonality=yes
    SystemCallArchitectures=native
    SystemCallFilter=@system-service
    SystemCallFilter=ioprio_get
    

    猜测这样可能就不会启动 seccomp 的功能了upower.service 调用的系统调用就能正确进行了,保证 systemctl start upower.service 启动成功

  17. 如果采用高版本的 glibc 库mk_xfce4.sh 的编译就会出现很多问题,编译 harfbuzzgdk-pixbuf 都会遇到问题: linking of temporary binary faileddied with <Signals.SIGSEGV: 11>,目前采用降低 glibc ( 2.32 ---> 2.27 ) 版本的方法,编译通过

  18. 编译 llvm 时,对内存要求特别高,小内存会导致编译失败,现象就是被系统 kill

    collect2: fatal error: ld terminated with signal 9 [Killed]
    

    所以一定保持系统的内存 >= 8G