加载中…大略理解 lightdm 的启动流程
(2014-07-04 11:22:12)
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lightdmxwindowlinux计算机科技 |
这个是我的原创，因为我是菜鸟，所以很可能有错，如果你要转载，请注明转载于我的博客。欢迎在评论中指出拼写，语法以及技术错误。谢谢。
主要的参考资料来自于
https://wiki.archlinux.org/index.php/LightDM
https://wiki.ubuntu.com/LightDM
The setting of lightdm seems hard to understand. So I use one day to study how it works.
As a example, the unity-greeter in Ubuntu 14.04 is employed to illustrate its initialization process.
The default configuration files of lightdm is in /usr/share/lightdm/lightdm.conf.d (maybe including lightdm.conf) ,
To override above setting,
/etc/lightdm/lightdm.conf is used. The ".conf" files define which
greeter will be used.
#display-stopped-script=command (Not in Ubuntu 12.04 LTS)
#greeter-setup-script=command
#session-setup-script=command
#session-cleanup-script=command
#session-wrapper=command
This sets that lightdm will find "ubuntu.desktop" files in
/usr/share/xsessions. This can be modified on login screen by
users. The information of user's xsession is strored in
$HOME/.dmrc. Actually, the contents in .dmrc is the last-selected
xsession. The contents of "/usr/share/xsessions/ubuntu.desktop"
is
[Desktop Entry]
Name=Ubuntu
Comment=This session logs you into Ubuntu
Exec=gnome-session --session=ubuntu
TryExec=unity
Icon=
Type=Application
X-LightDM-DesktopName=Unity
X-Ubuntu-Gettext-Domain=gnome-session-3.0
Name=Ubuntu
RequiredComponents=unity-settings-daemon;compiz;
DesktopName=Unity
主要的参考资料来自于
https://wiki.archlinux.org/index.php/LightDM
https://wiki.ubuntu.com/LightDM
The setting of lightdm seems hard to understand. So I use one day to study how it works.
As a example, the unity-greeter in Ubuntu 14.04 is employed to illustrate its initialization process.
The default configuration files of lightdm is in /usr/share/lightdm/lightdm.conf.d (maybe including lightdm.conf) ,
To override above setting,
in
/usr/share/lightdm/lightdm.conf.d/50-unity-greeter.conf
[SeatDefaults]greeter-session-unity-greeter=unity-greeter
#display-setup-script=command#######################
#display-stopped-script=command (Not in Ubuntu 12.04 LTS)
#greeter-setup-script=command
#session-setup-script=command
#session-cleanup-script=command
#session-wrapper=command
#greeter-wrapper=command (Not in Ubuntu 12.04 LTS)
########################
is setting. "session-wrapper" is a the
command to run for a session. This command is run as the user and
needs to exec the command passed in the arguments to complete
running the session. Use this if you need to do special setup for a
user session. Note the default is 'lightdm-session' so you should
chain to this if you need to override this setting. And
/usr/sbin/lightdm-session will chain load the traditional Xsession
scripts.
"unity-greeter" is a ".desktop" file in
/usr/share/xgreeters.
[Desktop Entry]
Name=Unity Greeter
Comment=Unity Greeter
Exec=unity-greeter
Type=Application
X-Ubuntu-Gettext-Domain=unity-greeter
Name=Unity Greeter
Comment=Unity Greeter
Exec=unity-greeter
Type=Application
X-Ubuntu-Gettext-Domain=unity-greeter
The "unity-greeter" on the "Exec" line is a binary executable
file placed in /usr/sbin/. If you check the log file
/var/log/lightdm/lightdm.log, you will find that unity-greeter is
executed by /usr/lib/lightdm/lightdm-greeter-session.
The appearance of the login screen is setting by
/usr/share/glib-2.0/schemas/com.canonical.unity-greeter.gschema.xml.
To make any modifications take effect,
glib-compile-schemas should be used.
In /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf
[SeatDefaults]
user-session=ubuntu
user-session=ubuntu
[Desktop Entry]
Name=Ubuntu
Comment=This session logs you into Ubuntu
Exec=gnome-session --session=ubuntu
TryExec=unity
Icon=
Type=Application
X-LightDM-DesktopName=Unity
X-Ubuntu-Gettext-Domain=gnome-session-3.0
The "Exec" entry set use gnome-session --session=ubuntu. This
entry let the gnome-session to find "ubuntu.session" in
$XDG_CONFIG_HOME/gnome-session/sessions,
$XDG_CONFIG_DIRS/gnome-session/sessions
and $XDG_DATA_DIRS/gnome-session/sessions. On my
system it is placed at /usr/share/gnome-session/sessions/. The
contents of ubuntu.session are
[GNOME Session]Name=Ubuntu
RequiredComponents=unity-settings-daemon;compiz;
DesktopName=Unity
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