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HTTP registry implementation

Implement HTTP registry support described in [RFC 2789](rust-lang/rfcs#2789).

Adds a new unstable flag `-Z http-registry` which allows cargo to interact with remote registries served over http rather than git. These registries can be identified by urls starting with `sparse+http://` or `sparse+https://`.

When fetching index metadata over http, cargo only downloads the metadata for needed crates, which can save significant time and bandwidth over git.

The format of the http index is identical to a checkout of a git-based index.

This change is based on `@jonhoo's` PR #8890.

cc `@Eh2406`

Remaining items:
- [x] Performance measurements
- [x] Make unstable only
- [x] Investigate unification of download system. Probably best done in separate change.
- [x] Unify registry tests (code duplication in `http_registry.rs`)
- [x] Use existing on-disk cache, rather than adding a new one.
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Cargo

Cargo downloads your Rust project’s dependencies and compiles your project.

To start using Cargo, learn more at The Cargo Book.

To start developing Cargo itself, read the Cargo Contributor Guide.

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Code documentation: https://docs.rs/cargo/

Installing Cargo

Cargo is distributed by default with Rust, so if you've got rustc installed locally you probably also have cargo installed locally.

Compiling from Source

Cargo requires the following tools and packages to build:

  • git
  • curl (on Unix)
  • pkg-config (on Unix, used to figure out the libssl headers/libraries)
  • OpenSSL headers (only for Unix, this is the libssl-dev package on ubuntu)
  • cargo and rustc

First, you'll want to check out this repository

git clone https://github.com/rust-lang/cargo
cd cargo

With cargo already installed, you can simply run:

cargo build --release

Adding new subcommands to Cargo

Cargo is designed to be extensible with new subcommands without having to modify Cargo itself. See the Wiki page for more details and a list of known community-developed subcommands.

Releases

Cargo releases coincide with Rust releases. High level release notes are available as part of Rust's release notes. Detailed release notes are available in this repo at CHANGELOG.md.

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See the Cargo Contributor Guide for a complete introduction to contributing to Cargo.

License

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See LICENSE-APACHE and LICENSE-MIT for details.

Third party software

This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit (https://www.openssl.org/).

In binary form, this product includes software that is licensed under the terms of the GNU General Public License, version 2, with a linking exception, which can be obtained from the upstream repository.

See LICENSE-THIRD-PARTY for details.