cargo upgrade fails to get crates version when using sparse registry

[inflation]

Since there will be no git repo locally after the change to use sparse registry, we need another way to figure out the latest version available.

[epage]

Does it fail in practice from a user changing their config?

From what I understand it shouldn't but I could be wrong.

As for server side, crates.io will continue to support the git registry, so switching to sparse registry is for performance and for alternative registries that drop git registry support.

Personally, I suspect the path to merging into cargo would be the faster / easier route.

[inflation]

If the user had previously fetched the index, they would be fine. However, the main purpose of sparse registry is to speed up fresh setup, so new users after the change would be clueless because the error message is bad:

Error: reference 'refs/heads/master' not found; class=Reference (4); code=NotFound (-3)

Caused by:
    reference 'refs/heads/master' not found; class=Reference (4); code=NotFound (-3)

From what I heard, cargo is currently on a feature freeze. I'm uncertain if this could make it into cargo before the default change.

[epage]

So this isn't a matter of crates-index not properly handling no registry existing. My guess is the sparse registry and git registry are sharing a path and the git registry needs to handle only the sparse registry being initialized

[epage]

I've tried to find reproduction steps for this to report this upstream but cannot reproduce this.

I've tried

• rm -rf ~/.cargo/registry and then initializing the index
• rm -rf ~/.cargo/registry/index/*/.git and then initializing the index

[5225225]

If you do rm -rf ~/.cargo/registry, then cargo upgrade (cargo-edit-upgrade 0.11.9) then Ctrl+C it a few seconds later, then try it again, you get that error. Incomplete checkout, I guess?

[ttys3]

If you do rm -rf ~/.cargo/registry, then cargo upgrade (cargo-edit-upgrade 0.11.9) then Ctrl+C it a few seconds later, then try it again, you get that error. Incomplete checkout, I guess?

I got this too.

[aminya]

As a workaround, adding the following to .cargo/config.toml fixes the issue:

# Because cargo-upgrade will fail otherwise
# https://github.com/killercup/cargo-edit/issues/841
[registries.crates-io]
protocol = "git"

https://doc.rust-lang.org/cargo/reference/config.html#registriescrates-ioprotocol

[0atman]

Just an fyi sparse becomes the default strategy in 1.70.0, due for release on the 1st of June https://releases.rs/docs/1.70.0/

Thanks all for your work!

[stevefan1999-personal]

Until frewsxcv/rust-crates-index#87 is fixed, we will have no progression

[stevefan1999-personal]

That was fixed last week, let's go ahead and upgrade it and see if it works

[epage]

To be clear, I would consider that a workaround (moving off of git) rather than a fix to the problem as using a git index at the same time as a parse index should work