Hi,
I created another user on my custom rom Android (aka Multiple users)
Unfortunately when doing so the system do not adapt the permission of the sdcard and some other directory, thus the new user can’t access them :/
So I wanted to “remote” terminal into my android device from my computer.
How are you achieving this ? ( without 3thparty apps please ! )
Thanks.
Each user gets their own partition in storage. So that user can see the SD card, just their partition in the card (whether internal or external).
Same with the primary user - it can only see its own partition.
If you have root, you can see these partitions as “user00”, “user11”, etc. From each user’s perspective, the related partition is mounted as SDCard or SDCardExt (or something like that, depends on the phone).
You can’t remote into Android without a third party app, since Android doesn’t natively host any remotely-accessable service (side note: this is part of what makes Linux more secure natively than Windows, and why we saw viruses on Windows - it natively has sharing services such as everything based on LanManager).
If you want to have access to the file system over the network, you’d need to host a network file service, i.e. FTP, Samba/CIFS, etc, from within the user profile of the partition you’d like to access.
If you want remote control, you’d need to use something like Rustdesk or ScrCpy.
I enable file sharing between user partitions by installing SyncThing-Fork in both profiles, then creating a sync job in both user profiles. For example, Profile1 has a local folder called SyncToWorkProfile, that Syncthing uses with a sync job (“Folder” in Syncthing terminology), that’s shared with the Syncthing Device ID of SyncThing in the Work Profile (and I do the same in the Work Profile). Those file system folders are unique to each partition - they’re different folders, as different as folders on 2 different computers. SyncThing simply synchronizes files between devices - since it sees each installation of SyncThing as a separate device, those two folders are kept in sync.
It would probably be more useful if you describe what you’re trying to accomplish - then we can consider the different ways to achieve your goals.
Android doesn’t natively host any remotely-accessable service
What about ADB? It’s disabled by default, but can be used over network as well.
You can do things with ADB (like copy files, etc). In fact, ScrCpy uses it for remote control.
You do have to enable developer options, then USB debugging, physically connect to a pc and authorize it (also enable permanent authorization and disable timeouts), etc. (I may forget a step or two there).
I wouldn’t really consider it a native sharing system - as you said, it’s not enabled by default, and it’s a bit cumbersome. It’s a debugging utility that happens to enable remote debugging which can be used for other things with a bit of work. Not something I’d tell most people to use, because it’s cumbersome, and opens a security hole. It’s also a bit unstable. It tends to drop the network connection for no apparent reason.
I use it to setup phones, because I can script a handful of app installs with it, or unlock the bootloader and flash a rom (or root the device).
The first user (owner) is probably 0, and the second one be 10, and additional users after 10 would be 10+x (11, 12, 13…).
