After being available as a separate crate for years, the
cargo vendor command is now integrated directly into Cargo. The command fetches all your project's dependencies unpacking them into the
vendor/ directory, and shows the configuration snippet required to use the vendored code during builds.
There are multiple cases where
cargo vendor is already used in production: the Rust compiler
rustc uses it to ship all its dependencies in release tarballs, and projects with monorepos use it to commit the dependencies' code in source control.