Bump index cache version to deal with semver metadata version mismatch. #9476
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Update cargo 8 commits in e51522ab3db23b0d8f1de54eb1f0113924896331..070e459c2d8b79c5b2ac5218064e7603329c92ae 2021-05-07 21:29:52 +0000 to 2021-05-11 18:12:23 +0000 - Fix rustdoc warnings (rust-lang/cargo#9468) - Improve performance of git status check in `cargo package`. (rust-lang/cargo#9478) - Link to the new rustc tests chapter. (rust-lang/cargo#9477) - Bump index cache version to deal with semver metadata version mismatch. (rust-lang/cargo#9476) - Fix Url::into_string deprecation warning (rust-lang/cargo#9475) - Fix rust-lang/cargo#4482 and rust-lang/cargo#9449: set Fossil ignore and clean settings locally (rust-lang/cargo#9469) - Improve two error messages (rust-lang/cargo#9472) - Fix `cargo install` with a semver metadata version. (rust-lang/cargo#9467)
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#9467 has uncovered an issue with how versions are handled in the index cache. When using a debug build of Cargo, it may panic due to the cache contents changing. The particular problem I am running into is that the index has an entry for
openssl-src 110.0.0and110.0.0+1.1.0f. This is due to an issue with crates.io where it allows publishing multiple versions with the same metadata (rust-lang/crates.io#1059). Cargos before #9467 would populate the index cache with two entries, both with version110.0.0. Afterwards, there are two separate entries (110.0.0and110.0.0+1.1.0f).The change here is to bump the index cache version so that new versions of cargo will clear the cache, and won't trigger the assertion.
This may be a bit of a heavy-handed solution, as I think this only affects debug builds of cargo. However, I instantly started running into this problem, so I suspect it will be a real annoyance for anyone developing cargo. Happy to discuss other possible solutions.