V2 manifests

[brson]

This teaches multirust to read V2 manifests. It adds the list-available-targets <toolchain> and add-target <toolchain> commands.

This has only been unit tested on Linux, Windows and Mac, not tested live, so don't merge yet.

I'll be happy to squash if this history is too ugly.

r? @alexcrichton cc @edunham

[alexcrichton]

lgtm, r=me when this is ready

[SimonSapin]

I didn’t manage to make this work. Am I missing some install step?

$ multirust list-available-targets nightly
rustup: no channel manifest at '/home/simon/tmp/multirust/toolchains/nightly/lib/rustlib/channel-manifest.toml'
$ multirust add-target nightly arm-linux-androideabi
rustup: no channel manifest at '/home/simon/tmp/multirust/toolchains/nightly/lib/rustlib/channel-manifest.toml'

[brson]

@SimonSapin The infrastructure necessary to make this work hasn't been deployed yet.

[lberezy]

What's the status of this? Apparently simple cross-compliation is waiting on this to land.

There seems to be work happening on the new branch here.

[brson]

@lberezy Still waiting on support in rust-buildbot to generate the correct metadata. It is actively being worked on this week.