7442c14be8
Add schema field and `features2` to the index.
This adds a `v` field to the index which indicates a format version for an index entry. If Cargo encounters a version newer than it understands, it will ignore those entries. This makes it safer to make changes to the index entries (such as adding new things), and not need to worry about how older cargos will react to it. In particular, this will make it safer to run `cargo update` on older versions if we ever decide to add new things to the index.
Currently this is not written anywhere, and is intended as a safety guard for the future. For now I will leave it undocumented until we actually decide to start using it.
This also moves the new syntax for namespaced features and weak dependency features into a new field ("features2") in the index. This is necessary to avoid breaking Cargo versions older than 1.19, which fail to parse the index even if there is a Cargo.lock file.
It is intended that only crates.io will bother with creating this field. Other registries don't need to bother, since they generally don't support Cargo older than 1.19.
I'm uncertain exactly when we should try to update crates.io to start accepting this, as that is a somewhat permanent decision.
Cargo
Cargo downloads your Rust project’s dependencies and compiles your project.
Learn more at https://doc.rust-lang.org/cargo/
Code Status
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:
gitcurl(on Unix)pkg-config(on Unix, used to figure out thelibsslheaders/libraries)- OpenSSL headers (only for Unix, this is the
libssl-devpackage on ubuntu) cargoandrustc
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.
Reporting issues
Found a bug? We'd love to know about it!
Please report all issues on the GitHub issue tracker.
Contributing
See the Cargo Contributor Guide for a complete introduction to contributing to Cargo.
License
Cargo is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0).
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.