You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.rs
    path of file: ./repos/cargo/src/bin/cargo
    
    the code of the file until where you have to start completion: #![allow(clippy::self_named_module_files)] // false positive in `commands/build.rs`

use cargo::core::shell::Shell;
use cargo::util::network::http::http_handle;
use cargo::util::network::http::needs_custom_http_transport;
use cargo::util::{self, closest_msg, command_prelude, CargoResult};
use cargo_util::{ProcessBuilder, ProcessError};
use cargo_util_schemas::manifest::StringOrVec;
use std::collections::BTreeMap;
use std::env;
use std::ffi::OsStr;
use std::fs;
use std::path::{Path, PathBuf};

mod cli;
mod commands;

use crate::command_prelude::*;

fn main() {
    let _guard = setup_logger();

    let mut gctx = match GlobalContext::default() {
        Ok(gctx) => gctx,
        Err(e) => {
            let mut shell = Shell::new();
 
    
fn init_git_transports(gctx: &GlobalContext) {
    match needs_custom_http_transport(gctx) {
        Ok(true) => {}
        _ => return,
    }

    let handle = match http_handle(gctx) {
        Ok(handle) => handle,
        Err(..) => return,
    };

    // The unsafety of the registration function derives from two aspects:
    //
    // 1. This call must be synchronized with all other registration calls as
    //    well as construction of new transports.
    // 2. The argument is leaked.
    //
    // We're clear on point (1) because this is only called at the start of this
    // binary (we know what the state of the world looks like) and we're mostly
    // clear on point (2) because we'd only free it after everything is done
    // anyway
    unsafe {
        git2_curl::register(handle);
    }
}