add id mount

[lengrongfu]

Fixes: #2307

[YJDoc2]

@lengrongfu ping!

[lengrongfu]

@lengrongfu ping!

Pong, I will continue to work.

[utam0k]

@lengrongfu Do you have any trouble? I can help you.

[lengrongfu]

@lengrongfu Do you have any trouble? I can help you.

https://github.com/opencontainers/runc/blob/d48d9cfefcdc13862ade35fd2df428cf9798bf22/libcontainer/process_linux.go#L459

Wo refer to this code, it use goroutine to recive init process callback to main process, then main process get id mapping in sending to init process. in Rust wu use thread to imple similar logic, not sure if this is correct?

After testing, I found an idmapp error. I think there is a problem with this part of the implementation.

[utam0k]

Wo refer to this code, it use goroutine to recive init process callback to main process, then main process get id mapping in sending to init process. in Rust wu use thread to imple similar logic, not sure if this is correct?

@lengrongfu
We have the pipes for connection between each process (main, init, intermediate). How about using it? We have similar logic in uid mapping.