Need clarification/further instruction on creating a shared folder

[rexendevar]

I've created a bind mount per the instructions on the docs page. Now what? My android files don't appear in linux and my linux files don't appear in android. How do I resolve the permissions problem? I've run chmod 777 and it did nothing. I also attempted to add the Linux user and the Waydroid fake user to a group but it failed because the waydroid user (uid 10136 on my machine) doesn't actually exist. Now what?

[rexendevar]

I've tried manually changing the ownership of the files and even that didn't work. I'm utterly clueless.

[Ashbd9]

I assume you ran sudo mount --bind ~/Downloads ~/.local/share/waydroid/data/media/0/Download.

sudo does not preserve your environment by default, and ~ replaces with /root.

Tell sudo to preserve your environment (maybe by running it as sudo -E), or try running sudo mount --bind /home/**<username>**/Downloads /home/**<username>**/.local/share/waydroid/data/media/0/Download.

[rexendevar]

This is not true - tested by running sudo ls ~/Documents and seeing my own user documents appear. The bind mount works just fine via this command. My problems are entirely permissions-related.

After much troubleshooting and research, I discovered that the theoretical solution involves matching the UID and GID of the Waydroid user to that of the Linux host user using lxc.idmap if I remember correctly. Unfortunately this requires the kernel to have been built using some option or module or whatever which enables this, and my kernel wasn't. This means it is IMPOSSIBLE to create a functional shared folder on my system.

[rexendevar]

If any maintainers read this, I want it known that this is a frankly unbelievable omission. The documentation page for this problem is only half complete and it is arguably the less useful half.

[Ashbd9]

You are correct. ~ is replaced by the shell with the current user home dir before any command runs.

[Ashbd9]

I have been able to create a shared folder on my system, although I have noticed that the mount --bind command has to be run while the waydroid session is running.
It also has to be repeated everytime the waydroid session is restarted.

[rexendevar]

yeah, i got this to work last night, at about 4 am. been attacking this problem since November and never had that piece of information

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[Ashbd9]

True. It should be in the docs. I found it myself through trial and error.