Beta cargo version needs to change

[alexcrichton]

Don't know a better place to file this where we can track it, so filing here.

Right now the Cargo tied to 1.14 beta suffers from rust-lang/cargo#3303, which we need to fix. This regression in required libraries was introduced by rust-lang/cargo#3272 and was later fixed by rust-lang/cargo#3311 and rust-lang/cargo#3315.

Beta's Cargo date is 2016-11-16, corresponding to rust-lang/cargo@a9c23dd and includes rust-lang/cargo#3272. The previous nightly, 2016-11-15, corresponds to rust-lang/cargo@9f1beaf which also includes rust-lang/cargo#3272. The previous successful nightly was 2016-11-09 which corresponds to rust-lang/cargo@5b5684e. Unfortunately that nightly does not contain rust-lang/cargo#3280 which is required for beta to bootstrap with rustbuild.

So we've got a few options:

• Fast forward the Cargo nightly by a few weeks. We'd have to fixup version numbers with new commits.
• Start release branches of Cargo now with the support from Continuously publish Cargo builds cargo#3239
• Prepare a custom branch of Cargo and upload a new nightly for some previous date manually (somehow).

My preference is to go with rust-lang/cargo#3239. @brson what do you think?

[steveklabnik]

I like that option too.

[brson]

I don't understand what "Start release branches of Cargo now with the support from rust-lang/cargo#3239" means. What are release branches in this context and how does that solve the problem?

[brson]

I think you are saying create a new branch named "stable" (or something), based off some older commit, have it upload to s3, then backport whatever fixes we need. Then update rust-packaging to source cargo from those uploads instead of the nightlies.

That sounds fine to me. I think we do need a release branch for cargo that we can backport to.

[brson]

If you do that, can you make Cargo not build with -nightly in the version name on the stable branch?

[alexcrichton]

@brson oh yes sorry I mean creating stable and beta branches of Cargo, and then building binaries from there instead of just on nightly. That'd allow us to easily backport fixes to beta without having to fast-forward beta.

Also yeah I think we could fix the -nightly thing at the same time.

[alexcrichton]

I've opened rust-lang/cargo#3345 to explore release branches on Cargo.