如何使用android init.rc(vendor.rc)读取文件中的值 [英] How to read a value in a file with android init.rc (vendor.rc)

问题描述

在android系统(pie 9.0)中 我想从文件(/cache/sticky/lcdlive)中读取一个值并将其写入init.vendor.rc中的系统属性(persist.vendor.lcd.live)

In the android system (pie 9.0) I want to read a value from a file (/cache/sticky/lcdlive) and write it to a system property (persist.vendor.lcd.live) in a init.vendor.rc

在exe.sh中:

lcdfiletmp="cache/sticky/lcdlive"
lcdlivetmp=$(cat "$lcdfiletmp")
setprop persist.vendor.lcd.live $lcdlivetmp 

，但是根据SElinux，我没有权利.

, but according to SElinux I don't have a right.

我已经在vendor.rc中尝试过:

I have tried in vendor.rc:

copy /cache/sticky/lcdlive persist.vendor.lcd.live
write persist.vendor.lcd.live /cache/sticky/lcdlive 

结果:persist.vendor.lcd.live ="/cache/sticky/lcdlive"，而不是文件/cache/sticky/lcdlive的"value"(数字)

result : persist.vendor.lcd.live = "/cache/sticky/lcdlive" but not the "value" of the file /cache/sticky/lcdlive (which is a number)

on early-init
 setprop persist.vendor.lcd.live  0

on property:sys.boot_completed=1
 copy /cache/sticky/lcdlive persist.vendor.lcd.live

期望:persist.vendor.lcd.live =文件/cache/sticky/lcdlive中的值

expected : persist.vendor.lcd.live = value in the file /cache/sticky/lcdlive

推荐答案

我在init.vendor.rc中找不到任何读取文件的方法，但是我找到了解决方法:

I haven't found any way to read a file in init.vendor.rc but I found a solution :

1. 使用init.vendor.rc中的scripte.sh创建服务
2. 在scripte.sh中:

   lcdfiletmp="cache/sticky/lcdlive"
    lcdlivetmp=$(cat "$lcdfiletmp")
    setprop persist.vendor.lcd.live $lcdlivetmp

1. 最重要的一点是将脚本声明为系统，并将/cache/sticky/*锁定为系统.将属性声明为vendor_custom

1. most important to declare scripte to system and chown /cache/sticky/* to system. to declare property as vendor_custom

在* .te

这是一个非常复杂的selinux问题，如果您有任何类似的问题，请随时在这里询问.

it's quite complicated selinux problem, if you have any similar problem feel free to ask here.

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