cargo 0.24.0

Cargo, a package manager for Rust.
Documentation 
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use cargo::core::source::{Source, SourceId, GitReference};
use cargo::sources::git::{GitSource};
use cargo::util::{Config, CliResult, ToUrl};

#[derive(Deserialize)]
pub struct Options {
    flag_url: String,
    flag_reference: String,
    flag_verbose: u32,
    flag_quiet: Option<bool>,
    flag_color: Option<String>,
    flag_frozen: bool,
    flag_locked: bool,
    #[serde(rename = "flag_Z")]
    flag_z: Vec<String>,
}

pub const USAGE: &'static str = "
Checkout a copy of a Git repository

Usage:
    cargo git-checkout [options] --url=URL --reference=REF
    cargo git-checkout -h | --help

Options:
    -h, --help               Print this message
    -v, --verbose ...        Use verbose output (-vv very verbose/build.rs output)
    -q, --quiet              No output printed to stdout
    --color WHEN             Coloring: auto, always, never
    --frozen                 Require Cargo.lock and cache are up to date
    --locked                 Require Cargo.lock is up to date
    -Z FLAG ...              Unstable (nightly-only) flags to Cargo
";

pub fn execute(options: Options, config: &mut Config) -> CliResult {
    config.configure(options.flag_verbose,
                     options.flag_quiet,
                     &options.flag_color,
                     options.flag_frozen,
                     options.flag_locked,
                     &options.flag_z)?;
    let Options { flag_url: url, flag_reference: reference, .. } = options;

    let url = url.to_url()?;

    let reference = GitReference::Branch(reference.clone());
    let source_id = SourceId::for_git(&url, reference)?;

    let mut source = GitSource::new(&source_id, config)?;

    source.update()?;

    Ok(())
}