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cfffda9ae5
This allows to use `gitoxide` for all fetch operations, boosting performance for fetching the `crates.io` index by a factor of 2.2x, while being consistent on all platforms. For trying it, nightly builds of `cargo` can specify `-Zgitoxide=fetch`. It's also possible to set the `__CARGO_USE_GITOXIDE_INSTEAD_OF_GIT2=1` environment variable (value matters), which is when `-Zgitoxide=none` can be used to use `git2` instead. Limitations ----------- Note that what follows are current shortcomings that will be addressed in future PRs. - it's likely that authentication around the `ssh` protocol will work differently in practice as it uses the `ssh` program. - clones from `file://` based crates indices will need the `git` binary to serve the locatl repository. - the progress bar shown when fetching doesn't work like the orgiinal, but should already feel 'faster'.