git: Bail out if the url is sparse
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I ended up in the accidental case where my URL is sparse, and believe
this could also happen if someone uses `replace-with` in their `.cargo/
config.toml`. When `GitIndex` is created, this ends up with a rather
useless error:
Refusing to initialize the non-empty directory as '/home/me/.cargo/registry/index/my-custom-registry'
Because it is probably not finding a `git` repository at that place,
without realizing that it's a sparse index cache.
To solve the `replace-with` case above, or make this crate more
generally usable, shouldn't there be (if there isn't already) a
high-level wrapper that automatically delegates to `SparseIndex` if
the URL starts with `sparse+`, and hide the `GitIndex`/`SparseIndex`
"internals"?
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I ended up in the accidental case where my URL is sparse, and believe this could also happen if someone uses
replace-within their.cargo/ config.toml. WhenGitIndexis created, this ends up with a rather useless error:Because it is probably not finding a
gitrepository at that place, without realizing that it's a sparse index cache.To solve the
replace-withcase above, or make this crate more generally usable, shouldn't there be (if there isn't already) a high-level wrapper that automatically delegates toSparseIndexif the URL starts withsparse+, and hide theGitIndex/SparseIndex"internals"?