有道x7 pro修改rootfs为ext4

[xu-haozhe]

有道x7 pro修改rootfs为ext4

本教程在fedora中操作，其它系统具体步骤可能不同

前提

1. 需要 adb 权限

步骤

查看a/b槽

在adb shell中：

#查看挂载
mount 


#列出块设备
ls -l /dev/block/by-name

找到mount命令输出中，根目录对应的设备，与ls -l /dev/block/by-name中对应，例如：

/dev/mmcblk0p10 on / type xxxx (xx,xxxxxxxxxxx)


lrwxrwxrwx 1 root root 14 xxx  x xx:xx system_b -> /dev/mmcblk0p10

那么说明当前在b槽（接下来以b槽为例）

获取rootfs镜像

在pc中：

adb pull /dev/mmcblk0p10

获取当前rootfs镜像（使用刷adb的全量镜像应该也行吧？）

重新打包

创建与mmcblk0p10同样大小的磁盘镜像：

mke2fs -t ext4 -L system -O ^64bit,^metadata_csum,^has_journal new_system.img <siz>
#注意大小是 原字节数/1024

或许搞一个字节数相同的文件然后mkfs.ext4也行吧？没试过((

挂载新旧镜像:

sudo mkdir -p /mnt/old_img
sudo mkdir -p /mnt/new_img
sudo mount ./mmcblk0p10 /mnt/old_img
sudo mount ./new_system.img /mnt/new_img

然后使用cp复制：

cp -a /mnt/old_img/* /mnt/new_img/

卸载

sudo umount /mnt/old_img
sudo umount /mnt/new_img

将img写入设备

首先将img上传到设备：

adb push ./new_system.img /userdisk/img.img

使用dd写入：

dd if=/userdisk/img.imng of=/dev/mmcblk0p9
#这里注意写道另一个槽

切换a/b槽

首先使用 rkdevtool 解包一个更新包，在 Android 目录中会有一个 install.img

挂载：

sudo mkdir -p /mnt/install_img
sudo mount ./install.img /mnt/install_img

将其中的update_engine上传：

adb push /mnt/install_img/update_engine /userdisk/update_engine

在adb shell中完成切换：

/userdisk/update_engine --misc=other

重启设备，再次查看a/b槽，使用df -T查看根目录文件系统，如果为ext4则修改成功

如果根目录依然只读，使用mount -o remount,rw /重新挂载

[yoyorgznxt]

实测a7pro可用
不过大佬你首先将img上传到设备那段是不是打多了一个n

[xu-haozhe]

感谢

[xiao-k233]

这空间不够是真离谱

df -h
/dev/loop1      2.2G  2.2G     0 100% /mnt/rootfs
/dev/loop3      2.2G  2.1G     0 100% /tmp/newsys

cp: error writing '/tmp/newsys/etc/miniapp/resources/fonts/HarmonyOS_Sans_SC_Medium.ttf': No space left on device
cp: error writing '/tmp/newsys/etc/miniapp/resources/fonts/LICENSE.txt': No space left on device
cp: error writing '/tmp/newsys/oem/YoudaoDictPen/output/tts/Fontsyd/model/frontend/model_dyz_int8.npz.link': No space left on device
cp: error writing '/tmp/newsys/oem/secondary/etc/miniapp/resources/presetpkgs/8080272808953200.amr': No space left on device
cp: error writing '/tmp/newsys/oem/secondary/etc/miniapp/resources/presetpkgs/8080282888534774.amr': No space left on device
cp: error writing '/tmp/newsys/usr/bin/perf': No space left on device
cp: error writing '/tmp/newsys/usr/bin/perlthanks': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/Unicode/Collate/keys.txt': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/autodie/exception/system.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/autodie/exception.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/autodie/hints.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/autodie/skip.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/autodie.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/autouse.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/base.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/bigint.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/bignum.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/bigrat.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/blib.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/bytes.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/bytes_heavy.pl': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/charnames.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/constant.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/deprecate.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/diagnostics.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/dumpvar.pl': No space left on device
cp: cannot create directory '/tmp/newsys/usr/lib/perl5/5.32.1/encoding': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/experimental.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/feature.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/fields.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/filetest.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/if.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/integer.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/less.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/locale.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/meta_notation.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/ok.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/open.pm': No space left on device
cp: cannot create directory '/tmp/newsys/usr/lib/perl5/5.32.1/overload': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/overload.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/overloading.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/parent.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/perl5db.pl': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/perlfaq.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/sigtrap.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/sort.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/strict.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/subs.pm': No space left on device
cp: cannot create directory '/tmp/newsys/usr/lib/perl5/5.32.1/unicore': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/utf8.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/vars.pm': No space left on device
cp: cannot create directory '/tmp/newsys/usr/lib/perl5/5.32.1/version': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/version.pm': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/version.pod': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/vmsish.pm': No space left on device
cp: cannot create directory '/tmp/newsys/usr/lib/perl5/5.32.1/warnings': No space left on device
cp: error writing '/tmp/newsys/usr/lib/perl5/5.32.1/warnings.pm': No space left on device
cp: cannot create directory '/tmp/newsys/usr/lib/perl5/site_perl': No space left on device
cp: cannot create directory '/tmp/newsys/usr/lib/pm-utils': No space left on device
cp: cannot create directory '/tmp/newsys/usr/lib/pulse-14.2': No space left on device
cp: cannot create directory '/tmp/newsys/usr/lib/pulseaudio': No space left on device
cp: cannot create directory '/tmp/newsys/usr/lib/traceevent': No space left on device
cp: cannot create directory '/tmp/newsys/usr/lib/ts': No space left on device
cp: cannot create directory '/tmp/newsys/usr/lib/udev': No space left on device
cp: cannot create directory '/tmp/newsys/usr/libexec': No space left on device
cp: cannot create directory '/tmp/newsys/usr/sbin': No space left on device
cp: cannot create directory '/tmp/newsys/usr/share': No space left on device
cp: cannot create directory '/tmp/newsys/usr/vqefiles': No space left on device
cp: cannot create directory '/tmp/newsys/var': No space left on device
cp: error writing '/tmp/newsys/Version': No space left on device