Android 12 adb push更新系统应用

需求描述

adb 传输文件的权限问题——remote couldn’t create file: Read-only file system

需要push /system/system_ext/priv-app/ 安装系统apk

adb root 
adb remount 

adb报错：remote couldn't create file: Read-only file system

解决

需要关闭linux kernel 安全验证功能 dm-verity
1. 关于 dm-verity

Device-Mapper’s “verity” target provides transparent integrity checking of block devices using a cryptographic digest provided by the kernel crypto API. This target is read-only.

adb --help 说明

disable-verity           disable dm-verity checking on userdebug builds
enable-verity            re-enable dm-verity checking on userdebug builds

2.关闭dm-verify

adb disable-verity

报错：Device is locked. Please unlock the device first using overlayfs

解决

(1) 进入开发者模式，打开OEM 解锁
(2) adb reboot bootloader进入fastboot模式
(3) fastboot flashing unlock, 需要在设备上面选择unlock，成功后会提示Finished. Total time: 0.025s
(4)如果机器没有自动重启，则执行fastboot reboot重启手机.在运行过程中我的机器会自动重启所以省略了这一步
(5)开机之后，依次adb root，adb disable-verity，adb reboot即可，此时查看OEM 解锁项是灰显的

adb disable-verity 提示
第一种提示： 说明没有打开OEM解锁

Device is locked. Please unlock the device first
using overlayfs
Now reboot your device for settings to take effect

第二种提示： 说明成功

using overlayfs
Successfully disabled verity
Now reboot your device for settings to take effect

注意：在fastboot reboot 后机器可能停止在logo加载过程中… ,此时可以直接adb 操作

第三种提示：adb remount 后提示，说明OEM adb disable-verity没成功

C:>adb root
C:>adb remount
Skipping /system for remount
Skipping /vendor for remount
Skipping /product for remount
No partitions to remount
remount failed

3. push 安装apk不生效

(1) adb shell 找到 apk 位置删除apk
(2) adb push 到上面删除位置
注： 直接push覆盖更新的代码不生效，需要手动删除
原因参考：https://blog.youkuaiyun.com/cengdong/article/details/71105059
（3）kill app生效

adb shell am force-stop com.android.gallery3d
adb shell am start -n com.android.gallery3d/com.android.gallery3d.app.GalleryActivity