Feature Request: Clean up download dir (partials etc) after successful full update run.

[timw4mail]

Edited by @kinnison to reflect decision later in thread

It'd be good to have the downloads directory cleaned up if a full update (i.e. not a single-toolchain update) is completed. That way any partial files etc lying around from failed updates will get cleaned up when we're in a position to believe that all is well and they wouldn't be reused.

I'm prepared to mentor someone in doing this, and suggest you talk to me on Discord about it.

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Original from @timw4mail

Describe the problem you are trying to solve
After a while of use, the toolchains and downloads take up a decent amount of disk space.

Describe the solution you'd like
Add a cleanup command, which would remove old downloads and toolchains, perhaps keeping just the most recent on each update channel.

[kinnison]

We do sometimes leave .partial and other download files, and that could definitely do with cleaning up. The toolchains themselves only ever keep the one version around; though if you're finding yourself installing a lot of labelled toolchains (e.g. nightly-2019-07-12 or 1.34.0) then it'll be up to you to rustup toolchain uninstall them.

Rather than a cleanup command per-se, it'd probably make more sense if we made it so that any files left in the download dir are deleted iff we complete a full update.

Does that sound good to you?

[timw4mail]

Yeah, that make sense, and sounds like a better plan than a manual cleanup command.

[BeniCheni]

Friendly note: trying out a branch for this issue.