Prestaging for air-gapped bootstrap

[smijolovic]

Is there a way to pull the three tar files (rust-std, rustc, cargo) prior to the build stage for bootstrapping in an environment without connectivity?

In bootstrap.py,:
download_stage0

Pulls the three tar files and extracts them. I see that ./x.py accepts stage builds...but is there a way to call download_stage0 to package the tar files for packaging?

[jyn514]

This is pretty easy to add if someone wants to tackle it - add a new argument to bootstrap.py and exit early after

rust/src/bootstrap/bootstrap.py

Line 1058 in 10f4ce3

build.download_toolchain()

if it's set.

@rustbot label +E-easy +E-mentor

[rornic]

I can pick this up. It'd be my first contribution here.

@rustbot claim

[jyn514]

I'm going to close this until I hear back about whether make prepare does what you want. #98464 (comment)