Native bridge script should mount houdini.sfs as read-only

[Alkaid]

I encountered  "mount: losetup failed " error when enabling native bridge. Similar problems are also reported elsewhere [1][2]. Those discussions and suggestions did not help me solve the problem.

After some investigation, I found the mount script [3] is to blame. In particular, the downloaded houdini_x.sfs should be mounted as read-only explicitly, i.e. "mount -o ro,xxx". 

On one hand, I assume the houdini_x.sfs is supposed to be used as read-only anyway. On the other hand, the file permission of "houdini_x.sfs" itself can be read-only. For example, a) the root disk is readonly in qemu cmdline b) use a squashfs as system image, which will be mount as loop thus is readonly c) The /system may be mount as read-only.

In my case, I am booting android-x86 on a squashfs system image under qemu, thus /system/etc/houdini_x.sfs is a read-only file. Changing [3] to read-only mount solved my problem.

If you also had similar problems, please try this method out and let developers know whether it helps.

[1] https://www.reddit.com/r/Androidx86/comments/g0fprg/cannot_enable_native_bridge/

[2] https://groups.google.com/g/android-x86/c/mlU4ajAdr7A/m/9xsts9-9EwAJ

[3] https://git.osdn.net/view?p=android-x86/device-generic-common.git;a=blob;f=nativebridge/bin/enable_nativebridge;h=32b2e2f960f66775ed4f35f66f379a224beaece2;hb=0bf4692ffb98f1d3ac32a568a1b3b466baad6439#l18

[Chih-Wei Huang]

Alkaid <zgf574...@gmail.com> 於 2021年1月19日 週二 下午5:59寫道：

> I encountered "mount: losetup failed " error when enabling native bridge. Similar problems are also reported elsewhere [1][2]. Those discussions and suggestions did not help me solve the problem.
> After some investigation, I found the mount script [3] is to blame. In particular, the downloaded houdini_x.sfs should be mounted as read-only explicitly, i.e. "mount -o ro,xxx".
> On one hand, I assume the houdini_x.sfs is supposed to be used as read-only anyway. On the other hand, the file permission of "houdini_x.sfs" itself can be read-only. For example, a) the root disk is readonly in qemu cmdline b) use a squashfs as system image, which will be mount as loop thus is readonly c) The /system may be mount as read-only.
>
> In my case, I am booting android-x86 on a squashfs system image under qemu, thus /system/etc/houdini_x.sfs is a read-only file. Changing [3] to read-only mount solved my problem.
> If you also had similar problems, please try this method out and let developers know whether it helps.

Other people also reported the similar issue and it has been fixed in
the latest code.
Thanks!


--
Chih-Wei
Android-x86 project
http://www.android-x86.org