解决a start job is running for /etc/rc.d/rc.local Compatibility导致系统无法进入登录界面（串口命令行）

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1 问题

为了系统启动后，可以运行自定义的应用，在/etc/rc.local文件中，加入了应用的路径，

/home/root/weston-test -platform linuxfb:fb=/dev/fb0 

结果启动后，停留在

不能登录，故不能进行其他操作

2 分析

（1）作用

这个配置文件会在用户登陆之前读取，这个文件中写入了什么命令，在每次系统启动时都会执行一次

（2）形式

在有些系统中，会存在rc.local和rc.d/rc.local，其实他们是一个东西
/etc/rc.local是/etc/rc.d/rc.local的软连接

（3）内容

一般的rc.local文件有如下注释，有几点注意：

• 此脚本在登录时执行
• 确保此脚本返回
• 可以通过改变其执行权限位，决定是否运行
• 默认这个脚本什么也不做，留着它是为了向后兼容

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

（4）运行

现在rc.local通过systmed的service进行管理，默认会自动启动

查看状态

root@xboard:~# systemctl status rc-local.service
鈼[0m rc-local.service - /etc/rc.local Compatibility
   Loaded: loaded (/lib/systemd/system/rc-local.service; enabled-runtime; vendor preset: enabled)
   Active: active (exited) since Mon 2021-12-13 03:27:08 UTC; 25s ago
     Docs: man:systemd-rc-local-generator(8)
  Process: 4093 ExecStart=/etc/rc.local start (code=exited, status=0/SUCCESS)

Dec 13 03:27:08 imx8mqrom5720a1 systemd[1]: Starting /etc/rc.local Compatibility...
Dec 13 03:27:08 imx8mqrom5720a1 rc.local[4093]: getLinuxBase: Yocto 2.5
Dec 13 03:27:08 imx8mqrom5720a1 rc.local[4093]: key_event: Can't get gpio-keys event
Dec 13 03:27:08 imx8mqrom5720a1 systemd[1]: Started /etc/rc.local Compatibility.
Dec 13 03:27:09 imx8mqrom5720a1 rc.local[4093]: QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
Dec 13 03:27:09 imx8mqrom5720a1 rc.local[4093]: qt.qpa.screen: QXcbConnection: Could not connect to display
Dec 13 03:27:09 imx8mqrom5720a1 rc.local[4093]: Could not connect to any X display.

修改下重启启动

root@xboard:~# systemctl daemon-reload          
root@xboard:~# systemctl restart rc-local       
root@xboard:~# systemctl status rc-local.service
鈼[0m rc-local.service - /etc/rc.local Compatibility
   Loaded: loaded (/lib/systemd/system/rc-local.service; enabled-runtime; vendor preset: enabled)
   Active: active (exited) since Mon 2021-12-13 03:29:53 UTC; 1s ago
     Docs: man:systemd-rc-local-generator(8)
  Process: 4245 ExecStart=/etc/rc.local start (code=exited, status=0/SUCCESS)

Dec 13 03:29:53 imx8mqrom5720a1 systemd[1]: Starting /etc/rc.local Compatibility...
Dec 13 03:29:53 imx8mqrom5720a1 systemd[1]: Started /etc/rc.local Compatibility.
Dec 13 03:29:53 imx8mqrom5720a1 rc.local[4245]: QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
Dec 13 03:29:53 imx8mqrom5720a1 rc.local[4245]: qt.qpa.screen: QXcbConnection: Could not connect to display
Dec 13 03:29:53 imx8mqrom5720a1 rc.local[4245]: Could not connect to any X display.
Dec 13 03:29:53 imx8mqrom5720a1 rc.local[4245]: getLinuxBase: Yocto 2.5
Dec 13 03:29:53 imx8mqrom5720a1 rc.local[4245]: key_event: Can't get gpio-keys event

结果

故将命令修改为

/home/root/weston-test -platform linuxfb:fb=/dev/fb0 &

重启

参考

【1】类Ubuntu解决方法