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ubuntu在关机画面出现前进行网络连接的关闭的修改
/*********************************************************************
* Author : Samson
* Date : 05/07/2014
* Test platform:
* 3.11.0-12-generic #19-Ubuntu
* GNU bash, version 4.2.45
* *******************************************************************/mdm.conf 界面关闭服务配置# mdm - MDM Display Manager
#
# The display manager service manages the X servers running on the
# system, providing login and auto-login services
description "MDM Display Manager"
author "Linux Mint <root@linuxmint.com>"
#表示只有当事件filesystem被激活且(运行在不是关机和重启的运行级别的时候)且(dbus服务已经启动)且(card0已经添加或udev-fallback-graphics服务已经关闭)时，此服务启动
start on ((filesystem
and runlevel [!06]
and started dbus
and (drm-device-added card0 PRIMARY_DEVICE_FOR_DISPLAY=1
or stopped udev-fallback-graphics))
or runlevel PREVLEVEL=S)
#表示当系统运行在关机、单用户、重启的状态下时，关闭此服务
stop on runlevel [016]
#以下是注册3个事件到upstart事件驱动中
emits login-session-start
emits desktop-session-start
emits desktop-shutdown
#以下为进行服务启动后的处理过程
script
if [ -n "$UPSTART_EVENTS" ]
then
# Check kernel command-line for inhibitors, unless we are being called
# manually
for ARG in $(cat /proc/cmdline); do
if [ "$ARG" = "text" ]; then
#plymouth为开机、关机画面程序
plymouth quit || :
stop
exit 0
fi
done
if [ -f /etc/X11/default-display-manager ]; then
[ "$(cat /etc/X11/default-display-manager 2>/dev/null)" = "/usr/sbin/mdm" ] || { stop; exit 0; }
else
type lightdm >/dev/null 2>&1 && { stop; exit 0; } || true
fi
if [ "$RUNLEVEL" = S -o "$RUNLEVEL" = 1 ]
then
# Single-user mode
plymouth quit || :
exit 0
fi
fi
//测试各种环境脚本是否存在并载入环境变量
test -f /etc/profile && . /etc/profile
if [ -r /etc/default/locale ]; then
. /etc/default/locale
export LANG LANGUAGE LC_MESSAGES LC_ALL
elif [ -r /etc/environment ]; then
. /etc/environment
export LANG LANGUAGE LC_MESSAGES LC_ALL
fi
exec mdm
end script
#以下为停止此服务后需要进行的处理
post-stop script
if [ "$UPSTART_STOP_EVENTS" = runlevel ]; then
#得到当前网络连接(可能存在多个)，依次关闭
netlinklist=`less /proc/net/if_inet6 | grep -v lo | grep -v vmnet | awk ‘{print $6}‘`
echo "netlist is $netlinklist" >> /home/xxx/shutdownlog1
for node in $netlinklist
do
echo "node is $node" >> /home/xxx/shutdownlog2
/sbin/ifconfig $node down
done
#激活desktop-shutdown事件，会触发关机画面，注意下面的plymouth.conf配置文件中的desktop-shutdown所在位置
initctl emit desktop-shutdown
fi
end script
关机画面配置脚本：
# plymouth - Userspace bootsplash utility
#
# plymouth provides a boot splash screen on the system console using
# the kernel framebuffer device. On boot, this is nominally started by
# the initramfs so the pre-start script, script and post-start script
# parts are actually not run. These are normally run on shutdown instead.
description "userspace bootsplash utility"
start on (starting mountall
or (runlevel [016]
and (desktop-shutdown
or stopped xdm
or stopped uxlaunch)))
#此任务调用fork成为一个进程进行处理
expect fork
#upstart对此服务最多等待60秒，超过则进行kill此进程
kill timeout 60
script
if [ "$RUNLEVEL" = "0" -o "$RUNLEVEL" = "1" -o "$RUNLEVEL" = "6" ]; then
#若是关机、重启、单用户运行状态下，执行关机画面
exec /sbin/plymouthd --mode=shutdown
else
#执行开机画面
exec /sbin/plymouthd --mode=boot --attach-to-session
fi
end script
#当服务启动后，执行以下脚本
post-start script
if [ "$RUNLEVEL" = "0" -o "$RUNLEVEL" = "1" -o "$RUNLEVEL" = "6" ]; then
#执行关机动画
exec /bin/plymouth show-splash
fi
end script
#pre-stop exec /bin/plymouth quit
pre-stop script
exec /bin/plymouth quit
end script
参考资料：
http://upstart.ubuntu.com/cookbook/#footer
http://upstart.ubuntu.com/
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