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Downloading specific betas should be easier #1329

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@glandium

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@glandium

For Firefox, we have a script that kind of duplicates the behavior of rustup and that repacks rust for use on Firefox CI. In some cases, we need to pin a specific beta version, but failed to do so, so when 1.24.0-beta.1 replaced 1.23.0-beta.2 today, we ended up picking that, which, incidentally, broke Firefox CI because 1.24.0-beta.1 apparently breaks slog and servo.

Anyways, after some fiddling, it came out that it's possible to get a specific beta version... if you know when it was released.

That is,

$ rustup toolchain install beta-2017-12-08

installs 1.23.0-beta.2. You have to know that 1.23.0-beta.2 was released on that specific day, or scan all dates.

It would be much easier if it were possible to do:

$ rustup toolchain install 1.23.0-beta.2

which could rely on an hypothetical https://static.rust-lang.org/dist/channel-rust-1.23.0-beta.2.toml file.

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