lib.rs

//! [![crates.io](https://img.shields.io/crates/v/cross.svg)](https://crates.io/crates/cross)
//! [![crates.io](https://img.shields.io/crates/d/cross.svg)](https://crates.io/crates/cross)
//! [![Matrix](https://img.shields.io/matrix/cross-rs:matrix.org)](https://matrix.to/#/#cross-rs:matrix.org)
//!
//! # `cross`
//!
//! <p style="background:rgba(148,192,255,0.1);padding:0.5em;border-radius:0.2em">
//! <strong>⚠️ Warning:</strong> The cross library is for internal
//! use only: only the command-line interface is stable. The library
//! may change at any point for any reason. For documentation on the
//! CLI, please see the repository <a href="https://github.com/cross-rs/cross">README</a>,
//! <a href="https://github.com/cross-rs/cross/tree/main/docs">docs folder</a>
//! or the <a href="https://github.com/cross-rs/cross/wiki">wiki</a>.
//! </p>

#![deny(missing_debug_implementations, rust_2018_idioms)]
#![warn(
    clippy::explicit_into_iter_loop,
    clippy::explicit_iter_loop,
    clippy::implicit_clone,
    clippy::inefficient_to_string,
    clippy::map_err_ignore,
    clippy::map_unwrap_or,
    clippy::ref_binding_to_reference,
    clippy::semicolon_if_nothing_returned,
    clippy::str_to_string,
    clippy::string_to_string,
    clippy::unwrap_used
)]

#[cfg(test)]
mod tests;

pub mod cargo;
pub mod cli;
pub mod config;
pub mod cross_toml;
pub mod docker;
pub mod errors;
mod extensions;
pub mod file;
mod id;
mod interpreter;
pub mod rustc;
pub mod rustup;
pub mod shell;
pub mod temp;

use std::env;
use std::path::PathBuf;
use std::process::ExitStatus;

use cli::Args;
use color_eyre::owo_colors::OwoColorize;
use color_eyre::{Help, SectionExt};
use config::Config;
use cross_toml::BuildStd;
use rustc::{QualifiedToolchain, Toolchain};
use rustc_version::Channel;
use serde::{Deserialize, Serialize, Serializer};

pub use self::cargo::{cargo_command, cargo_metadata_with_args, CargoMetadata, Subcommand};
use self::cross_toml::CrossToml;
use self::errors::Context;
use self::shell::{MessageInfo, Verbosity};

pub use self::errors::{install_panic_hook, install_termination_hook, Result};
pub use self::extensions::{CommandExt, OutputExt, SafeCommand};
pub use self::file::{pretty_path, ToUtf8};
pub use self::rustc::{TargetList, VersionMetaExt};

pub const CROSS_LABEL_DOMAIN: &str = "org.cross-rs";

#[allow(non_camel_case_types)]
#[derive(Debug, Clone, PartialEq, Eq, Deserialize, Hash)]
#[serde(from = "&str", into = "String")]
#[serde(rename_all = "snake_case")]
pub enum TargetTriple {
    Other(String),

    // OSX
    X86_64AppleDarwin,
    // Support Apple Silicon, as developers are starting to use it as development workstation.
    Aarch64AppleDarwin,

    // Linux
    X86_64UnknownLinuxGnu,
    // Linux Aarch64 is become more popular in CI pipelines (e.g. to AWS Graviton based systems)
    Aarch64UnknownLinuxGnu,
    // (Alpine) Linux (musl) often use in CI pipelines to cross compile rust projects to different
    // targets (e.g. in GitLab CI pipelines).
    X86_64UnknownLinuxMusl,
    // (Alpine) Linux (musl) often use in CI pipelines to cross compile rust projects to different
    // targets (e.g. in GitLab CI pipelines). Now, that AWS Graviton based systems are gaining
    // attraction CI pipelines might run on (Alpine) Linux Aarch64.
    Aarch64UnknownLinuxMusl,

    // Windows MSVC
    X86_64PcWindowsMsvc,
}

impl TargetTriple {
    pub const DEFAULT: Self = Self::X86_64UnknownLinuxGnu;
    /// Returns the architecture name according to `dpkg` naming convention
    ///
    /// # Notes
    ///
    /// Some of these make no sense to use in our standard images
    pub fn deb_arch(&self) -> Option<&'static str> {
        match self.triple() {
            "aarch64-unknown-linux-gnu" => Some("arm64"),
            "aarch64-unknown-linux-musl" => Some("musl-linux-arm64"),
            "aarch64-linux-android" => None,
            "x86_64-unknown-linux-gnu" => Some("amd64"),
            "x86_64-apple-darwin" => Some("darwin-amd64"),
            "x86_64-unknown-linux-musl" => Some("musl-linux-amd64"),

            "x86_64-pc-windows-msvc" => None,
            "arm-unknown-linux-gnueabi" => Some("armel"),
            "arm-unknown-linux-gnueabihf" => Some("armhf"),
            "armv7-unknown-linux-gnueabi" => Some("armel"),
            "armv7-unknown-linux-gnueabihf" => Some("armhf"),
            "thumbv7neon-unknown-linux-gnueabihf" => Some("armhf"),
            "i586-unknown-linux-gnu" => Some("i386"),
            "i686-unknown-linux-gnu" => Some("i386"),
            "mips-unknown-linux-gnu" => Some("mips"),
            "mipsel-unknown-linux-gnu" => Some("mipsel"),
            "mips64-unknown-linux-gnuabi64" => Some("mips64"),
            "mips64el-unknown-linux-gnuabi64" => Some("mips64el"),
            "mips64-unknown-linux-muslabi64" => Some("musl-linux-mips64"),
            "mips64el-unknown-linux-muslabi64" => Some("musl-linux-mips64el"),
            "powerpc-unknown-linux-gnu" => Some("powerpc"),
            "powerpc64-unknown-linux-gnu" => Some("ppc64"),
            "powerpc64le-unknown-linux-gnu" => Some("ppc64el"),
            "riscv64gc-unknown-linux-gnu" => Some("riscv64"),
            "s390x-unknown-linux-gnu" => Some("s390x"),
            "sparc64-unknown-linux-gnu" => Some("sparc64"),
            "arm-unknown-linux-musleabihf" => Some("musl-linux-armhf"),
            "arm-unknown-linux-musleabi" => Some("musl-linux-arm"),
            "armv5te-unknown-linux-gnueabi" => None,
            "armv5te-unknown-linux-musleabi" => None,
            "armv7-unknown-linux-musleabi" => Some("musl-linux-arm"),
            "armv7-unknown-linux-musleabihf" => Some("musl-linux-armhf"),
            "i586-unknown-linux-musl" => Some("musl-linux-i386"),
            "i686-unknown-linux-musl" => Some("musl-linux-i386"),
            "mips-unknown-linux-musl" => Some("musl-linux-mips"),
            "mipsel-unknown-linux-musl" => Some("musl-linux-mipsel"),
            "arm-linux-androideabi" => None,
            "armv7-linux-androideabi" => None,
            "thumbv7neon-linux-androideabi" => None,
            "i686-linux-android" => None,
            "x86_64-linux-android" => None,
            "x86_64-pc-windows-gnu" => None,
            "i686-pc-windows-gnu" => None,
            "asmjs-unknown-emscripten" => None,
            "wasm32-unknown-emscripten" => None,
            "x86_64-unknown-dragonfly" => Some("dragonflybsd-amd64"),
            "i686-unknown-freebsd" => Some("freebsd-i386"),
            "x86_64-unknown-freebsd" => Some("freebsd-amd64"),
            "aarch64-unknown-freebsd" => Some("freebsd-arm64"),
            "x86_64-unknown-netbsd" => Some("netbsd-amd64"),
            "sparcv9-sun-solaris" => Some("solaris-sparc"),
            "x86_64-pc-solaris" => Some("solaris-amd64"),
            "thumbv6m-none-eabi" => Some("arm"),
            "thumbv7em-none-eabi" => Some("arm"),
            "thumbv7em-none-eabihf" => Some("armhf"),
            "thumbv7m-none-eabi" => Some("arm"),
            _ => None,
        }
    }

    /// Checks if this `(host, target)` pair is supported by `cross`
    ///
    /// `target == None` means `target == host`
    fn is_supported(&self, target: Option<&Target>) -> bool {
        match std::env::var("CROSS_COMPATIBILITY_VERSION")
            .as_ref()
            .map(|v| v.as_str())
        {
            // Old behavior (up to cross version 0.2.1) can be activated on demand using environment
            // variable `CROSS_COMPATIBILITY_VERSION`.
            Ok("0.2.1") => match self {
                TargetTriple::X86_64AppleDarwin | TargetTriple::Aarch64AppleDarwin => {
                    target.map_or(false, |t| t.needs_docker())
                }
                TargetTriple::X86_64UnknownLinuxGnu
                | TargetTriple::Aarch64UnknownLinuxGnu
                | TargetTriple::X86_64UnknownLinuxMusl
                | TargetTriple::Aarch64UnknownLinuxMusl => {
                    target.map_or(true, |t| t.needs_docker())
                }
                TargetTriple::X86_64PcWindowsMsvc => target.map_or(false, |t| {
                    t.triple() != TargetTriple::X86_64PcWindowsMsvc.triple() && t.needs_docker()
                }),
                TargetTriple::Other(_) => false,
            },
            // New behaviour, if a target is provided (--target ...) then always run with docker
            // image unless the target explicitly opts-out (i.e. unless needs_docker() returns false).
            // If no target is provided run natively (on host) using cargo.
            //
            // This not only simplifies the logic, it also enables forward-compatibility without
            // having to change cross every time someone comes up with the need for a new host/target
            // combination. It's totally fine to call cross with `--target=$host_triple`, for
            // example to test custom docker images. Cross should not try to recognize if host and
            // target are equal, it's a user decision and if user wants to bypass cross he can call
            // cargo directly or omit the `--target` option.
            _ => target.map_or(false, |t| t.needs_docker()),
        }
    }

    /// Returns the [`Target`] as target triple string
    pub fn triple(&self) -> &str {
        match self {
            TargetTriple::X86_64AppleDarwin => "x86_64-apple-darwin",
            TargetTriple::Aarch64AppleDarwin => "aarch64-apple-darwin",
            TargetTriple::X86_64UnknownLinuxGnu => "x86_64-unknown-linux-gnu",
            TargetTriple::Aarch64UnknownLinuxGnu => "aarch64-unknown-linux-gnu",
            TargetTriple::X86_64UnknownLinuxMusl => "x86_64-unknown-linux-musl",
            TargetTriple::Aarch64UnknownLinuxMusl => "aarch64-unknown-linux-musl",
            TargetTriple::X86_64PcWindowsMsvc => "x86_64-pc-windows-msvc",
            TargetTriple::Other(s) => s.as_str(),
        }
    }
}

impl<'a> From<&'a str> for TargetTriple {
    fn from(s: &str) -> TargetTriple {
        match s {
            "x86_64-apple-darwin" => TargetTriple::X86_64AppleDarwin,
            "x86_64-unknown-linux-gnu" => TargetTriple::X86_64UnknownLinuxGnu,
            "x86_64-unknown-linux-musl" => TargetTriple::X86_64UnknownLinuxMusl,
            "x86_64-pc-windows-msvc" => TargetTriple::X86_64PcWindowsMsvc,
            "aarch64-apple-darwin" => TargetTriple::Aarch64AppleDarwin,
            "aarch64-unknown-linux-gnu" => TargetTriple::Aarch64UnknownLinuxGnu,
            "aarch64-unknown-linux-musl" => TargetTriple::Aarch64UnknownLinuxMusl,
            s => TargetTriple::Other(s.to_owned()),
        }
    }
}

impl Default for TargetTriple {
    fn default() -> TargetTriple {
        TargetTriple::DEFAULT
    }
}

impl std::str::FromStr for TargetTriple {
    type Err = std::convert::Infallible;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        Ok(s.into())
    }
}

impl std::fmt::Display for TargetTriple {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str(self.triple())
    }
}

impl From<String> for TargetTriple {
    fn from(s: String) -> TargetTriple {
        s.as_str().into()
    }
}

impl Serialize for TargetTriple {
    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
        serializer.serialize_str(self.triple())
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Hash, Deserialize)]
#[serde(from = "String")]
pub enum Target {
    BuiltIn { triple: TargetTriple },
    Custom { triple: TargetTriple },
}

impl Target {
    pub const DEFAULT: Self = Self::BuiltIn {
        triple: TargetTriple::DEFAULT,
    };

    fn new_built_in(triple: &str) -> Self {
        Target::BuiltIn {
            triple: triple.into(),
        }
    }

    fn new_custom(triple: &str) -> Self {
        Target::Custom {
            triple: triple.into(),
        }
    }

    pub fn triple(&self) -> &str {
        match *self {
            Target::BuiltIn { ref triple } => triple.triple(),
            Target::Custom { ref triple } => triple.triple(),
        }
    }

    pub fn target(&self) -> &TargetTriple {
        match *self {
            Target::BuiltIn { ref triple } => triple,
            Target::Custom { ref triple } => triple,
        }
    }

    fn is_apple(&self) -> bool {
        self.triple().contains("apple")
    }

    fn is_bare_metal(&self) -> bool {
        self.triple().ends_with("-none")
            || self.triple().ends_with("-none-elf")
            || self.triple().ends_with("-none-eabi")
            || self.triple().ends_with("-none-eabihf")
    }

    fn is_builtin(&self) -> bool {
        match *self {
            Target::BuiltIn { .. } => true,
            Target::Custom { .. } => false,
        }
    }

    fn is_bsd(&self) -> bool {
        self.triple().contains("bsd") || self.triple().contains("dragonfly")
    }

    fn is_solaris(&self) -> bool {
        self.triple().contains("solaris")
    }

    fn is_illumos(&self) -> bool {
        self.triple().contains("illumos")
    }

    fn is_android(&self) -> bool {
        self.triple().contains("android")
    }

    fn is_emscripten(&self) -> bool {
        self.triple().contains("emscripten")
    }

    fn is_linux(&self) -> bool {
        self.triple().contains("linux") && !self.is_android()
    }

    fn is_windows(&self) -> bool {
        self.triple().contains("windows")
    }

    fn needs_docker(&self) -> bool {
        self.is_linux()
            || self.is_android()
            || self.is_bare_metal()
            || self.is_bsd()
            || self.is_solaris()
            || self.is_illumos()
            || !self.is_builtin()
            || self.is_windows()
            || self.is_emscripten()
            || self.is_apple()
    }

    fn needs_interpreter(&self) -> bool {
        let native = self.triple().starts_with("x86_64")
            || self.triple().starts_with("i586")
            || self.triple().starts_with("i686");

        !native && (self.is_linux() || self.is_windows() || self.is_bare_metal())
    }

    fn needs_docker_seccomp(&self) -> bool {
        let arch_32bit = self.triple().starts_with("arm")
            || self.triple().starts_with("thumb")
            || self.triple().starts_with("i586")
            || self.triple().starts_with("i686");

        arch_32bit && self.is_android()
    }
}

impl Default for Target {
    fn default() -> Target {
        Target::DEFAULT
    }
}

impl std::fmt::Display for Target {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str(self.triple())
    }
}

impl Target {
    pub fn from(triple: &str, target_list: &TargetList) -> Target {
        if target_list.contains(triple) {
            Target::new_built_in(triple)
        } else {
            Target::new_custom(triple)
        }
    }
}

impl From<TargetTriple> for Target {
    fn from(host: TargetTriple) -> Target {
        match host {
            TargetTriple::X86_64UnknownLinuxGnu => Target::new_built_in("x86_64-unknown-linux-gnu"),
            TargetTriple::X86_64UnknownLinuxMusl => {
                Target::new_built_in("x86_64-unknown-linux-musl")
            }
            TargetTriple::X86_64AppleDarwin => Target::new_built_in("x86_64-apple-darwin"),
            TargetTriple::X86_64PcWindowsMsvc => Target::new_built_in("x86_64-pc-windows-msvc"),
            TargetTriple::Aarch64AppleDarwin => Target::new_built_in("aarch64-apple-darwin"),
            TargetTriple::Aarch64UnknownLinuxGnu => {
                Target::new_built_in("aarch64-unknown-linux-gnu")
            }
            TargetTriple::Aarch64UnknownLinuxMusl => {
                Target::new_built_in("aarch64-unknown-linux-musl")
            }
            TargetTriple::Other(s) => Target::from(
                s.as_str(),
                &rustc::target_list(&mut Verbosity::Quiet.into())
                    .expect("should be able to query rustc"),
            ),
        }
    }
}

impl From<String> for Target {
    fn from(target_str: String) -> Target {
        let target_host: TargetTriple = target_str.as_str().into();
        target_host.into()
    }
}

impl Serialize for Target {
    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
        serializer.serialize_str(self.triple())
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum CommandVariant {
    Cargo,
    Xargo,
    Zig,
    Shell,
}

impl CommandVariant {
    pub fn create(uses_zig: bool, uses_xargo: bool) -> Result<CommandVariant> {
        match (uses_zig, uses_xargo) {
            (true, true) => eyre::bail!("cannot use both zig and xargo"),
            (true, false) => Ok(CommandVariant::Zig),
            (false, true) => Ok(CommandVariant::Xargo),
            (false, false) => Ok(CommandVariant::Cargo),
        }
    }

    pub fn to_str(self) -> &'static str {
        match self {
            CommandVariant::Cargo => "cargo",
            CommandVariant::Xargo => "xargo",
            CommandVariant::Zig => "cargo-zigbuild",
            CommandVariant::Shell => "sh",
        }
    }

    pub fn uses_xargo(self) -> bool {
        self == CommandVariant::Xargo
    }

    pub fn uses_zig(self) -> bool {
        self == CommandVariant::Zig
    }

    pub(crate) fn is_shell(self) -> bool {
        self == CommandVariant::Shell
    }
}

fn warn_on_failure(
    target: &Target,
    toolchain: &QualifiedToolchain,
    msg_info: &mut MessageInfo,
) -> Result<()> {
    let rust_std = format!("rust-std-{target}");
    if target.is_builtin() {
        let component = rustup::check_component(&rust_std, toolchain, msg_info)?;
        if component.is_not_available() {
            msg_info.warn(format_args!("rust-std is not available for {target}"))?;
            msg_info.note(
                format_args!(
                    r#"you may need to build components for the target via `-Z build-std=<components>` or in your cross configuration specify `target.{target}.build-std`
              the available components are core, std, alloc, and proc_macro"#
                ),
            )?;
        }
    }
    Ok(())
}

fn add_libc_version(triple: &str, zig_version: Option<&str>) -> String {
    match zig_version {
        Some(libc) => format!("{triple}.{libc}"),
        None => triple.to_owned(),
    }
}

pub fn run(
    args: Args,
    target_list: TargetList,
    msg_info: &mut MessageInfo,
) -> Result<Option<ExitStatus>> {
    if args.version && args.subcommand.is_none() {
        msg_info.print(concat!(
            "cross ",
            env!("CARGO_PKG_VERSION"),
            crate::commit_info!()
        ))?;
    }

    if let Some(Subcommand::Other(command)) = &args.subcommand {
        msg_info.warn(format_args!(
            "specified cargo subcommand `{command}` is not supported by `cross`."
        ))?;
        return Ok(None);
    }

    let host_version_meta = rustc::version_meta()?;

    let cwd = std::env::current_dir()?;
    if let Some(metadata) = cargo_metadata_with_args(None, Some(&args), msg_info)? {
        let CrossSetup {
            config,
            target,
            uses_xargo,
            uses_zig,
            build_std,
            zig_version,
            toolchain,
            is_remote,
            engine,
            image,
        } = match setup(&host_version_meta, &metadata, &args, target_list, msg_info)? {
            Some(setup) => setup,
            _ => {
                return Ok(None);
            }
        };

        config.confusable_target(&target, msg_info)?;

        let picked_generic_channel =
            matches!(toolchain.channel.as_str(), "stable" | "beta" | "nightly");

        if image.platform.target.is_supported(Some(&target)) {
            if image.platform.architecture != toolchain.host().architecture {
                msg_info.warn(format_args!(
                    "toolchain `{toolchain}` may not run on image `{image}`"
                ))?;
            }
            let mut is_nightly = toolchain.channel.contains("nightly");
            let mut rustc_version = None;
            if let Some((version, channel, commit)) = toolchain.rustc_version()? {
                if picked_generic_channel && toolchain.date.is_none() {
                    warn_host_version_mismatch(
                        &host_version_meta,
                        &toolchain,
                        &version,
                        &commit,
                        msg_info,
                    )?;
                }
                is_nightly = channel == Channel::Nightly;
                rustc_version = Some(version);
            }

            let available_targets = rustup::setup_rustup(&toolchain, msg_info)?;

            rustup::setup_components(
                &target,
                uses_xargo,
                build_std.enabled(),
                &toolchain,
                is_nightly,
                available_targets,
                &args,
                msg_info,
            )?;

            let filtered_args =
                get_filtered_args(zig_version, &args, &target, &config, is_nightly, &build_std);

            let needs_docker = args
                .subcommand
                .clone()
                .map_or(false, |sc| sc.needs_docker(is_remote));
            if target.needs_docker() && needs_docker {
                let paths = docker::DockerPaths::create(
                    &engine,
                    metadata,
                    cwd,
                    toolchain.clone(),
                    msg_info,
                )?;
                let options = docker::DockerOptions::new(
                    engine,
                    target.clone(),
                    config,
                    image,
                    crate::CommandVariant::create(uses_zig, uses_xargo)?,
                    rustc_version,
                    false,
                );

                if msg_info.should_fail() {
                    return Ok(None);
                }

                install_interpreter_if_needed(
                    &args,
                    host_version_meta,
                    &target,
                    &options,
                    msg_info,
                )?;
                let status = if let Some(status) = docker::run(
                    options,
                    paths,
                    &filtered_args,
                    args.subcommand.clone(),
                    msg_info,
                )
                .wrap_err("could not run container")?
                {
                    status
                } else {
                    return Ok(None);
                };

                let needs_host = args.subcommand.map_or(false, |sc| sc.needs_host(is_remote));
                if !status.success() {
                    warn_on_failure(&target, &toolchain, msg_info)?;
                }
                if !(status.success() && needs_host) {
                    return Ok(Some(status));
                }
            }
        }
    }
    Ok(None)
}

/// Check if an interpreter is needed and then install it.
pub fn install_interpreter_if_needed(
    args: &Args,
    host_version_meta: rustc_version::VersionMeta,
    target: &Target,
    options: &docker::DockerOptions,
    msg_info: &mut MessageInfo,
) -> Result<(), color_eyre::Report> {
    let needs_interpreter = args
        .subcommand
        .clone()
        .map_or(false, |sc| sc.needs_interpreter());

    if host_version_meta.needs_interpreter()
        && needs_interpreter
        && target.needs_interpreter()
        && !interpreter::is_registered(target)?
    {
        options.engine.register_binfmt(target, msg_info)?;
    }
    Ok(())
}

/// Get filtered args to pass to cargo
pub fn get_filtered_args(
    zig_version: Option<String>,
    args: &Args,
    target: &Target,
    config: &Config,
    is_nightly: bool,
    build_std: &BuildStd,
) -> Vec<String> {
    let add_libc = |triple: &str| add_libc_version(triple, zig_version.as_deref());
    let mut filtered_args = if args
        .subcommand
        .clone()
        .map_or(false, |s| !s.needs_target_in_command())
    {
        let mut filtered_args = Vec::new();
        let mut args_iter = args.cargo_args.clone().into_iter();
        while let Some(arg) = args_iter.next() {
            if arg == "--target" {
                args_iter.next();
            } else if arg.starts_with("--target=") {
                // NOOP
            } else {
                filtered_args.push(arg);
            }
        }
        filtered_args
    // Make sure --target is present
    } else if !args.cargo_args.iter().any(|a| a.starts_with("--target")) {
        let mut args_with_target = args.cargo_args.clone();
        args_with_target.push("--target".to_owned());
        args_with_target.push(add_libc(target.triple()));
        args_with_target
    } else if zig_version.is_some() {
        let mut filtered_args = Vec::new();
        let mut args_iter = args.cargo_args.clone().into_iter();
        while let Some(arg) = args_iter.next() {
            if arg == "--target" {
                filtered_args.push("--target".to_owned());
                if let Some(triple) = args_iter.next() {
                    filtered_args.push(add_libc(&triple));
                }
            } else if let Some(stripped) = arg.strip_prefix("--target=") {
                filtered_args.push(format!("--target={}", add_libc(stripped)));
            } else {
                filtered_args.push(arg);
            }
        }
        filtered_args
    } else {
        args.cargo_args.clone()
    };

    let is_test = args
        .subcommand
        .clone()
        .map_or(false, |sc| sc == Subcommand::Test);
    if is_test && config.doctests().unwrap_or_default() && is_nightly {
        filtered_args.push("-Zdoctest-xcompile".to_owned());
    }

    if build_std.enabled() {
        let mut arg = "-Zbuild-std".to_owned();
        if let BuildStd::Crates(crates) = build_std {
            arg.push('=');
            arg.push_str(&crates.join(","));
        }
        filtered_args.push(arg);
    }

    filtered_args.extend(args.rest_args.iter().cloned());
    filtered_args
}

/// Setup cross configuration
pub fn setup(
    host_version_meta: &rustc_version::VersionMeta,
    metadata: &CargoMetadata,
    args: &Args,
    target_list: TargetList,
    msg_info: &mut MessageInfo,
) -> Result<Option<CrossSetup>, color_eyre::Report> {
    let host = host_version_meta.host();
    let toml = toml(metadata, msg_info)?;
    let config = Config::new(Some(toml));
    let target = args
        .target
        .clone()
        .or_else(|| config.target(&target_list))
        .unwrap_or_else(|| Target::from(host.triple(), &target_list));
    let build_std = config.build_std(&target).unwrap_or_default();
    let uses_xargo = !build_std.enabled() && config.xargo(&target).unwrap_or(!target.is_builtin());
    let uses_zig = config.zig(&target).unwrap_or(false);
    let zig_version = config.zig_version(&target);
    let image = match docker::get_image(&config, &target, uses_zig) {
        Ok(i) => i,
        Err(docker::GetImageError::NoCompatibleImages(..))
            if config.dockerfile(&target).is_some() =>
        {
            "scratch".into()
        }
        Err(err) => {
            msg_info.warn(err)?;

            return Ok(None);
        }
    };
    let default_toolchain = QualifiedToolchain::default(&config, msg_info)?;
    let mut toolchain = if let Some(channel) = &args.channel {
        let picked_toolchain: Toolchain = channel.parse()?;

        if let Some(picked_host) = &picked_toolchain.host {
            return Err(eyre::eyre!("the specified toolchain `{picked_toolchain}` can't be used"))
                .with_suggestion(|| {
                    format!(
                        "try `cross +{}` instead",
                        picked_toolchain.remove_host()
                    )
                }).with_section(|| format!(
    r#"Overriding the toolchain in cross is only possible in CLI by specifying a channel and optional date: `+channel[-YYYY-MM-DD]`.
To override the toolchain mounted in the image, set `target.{target}.image.toolchain = "{picked_host}"`"#).header("Note:".bright_cyan()));
        }

        default_toolchain.with_picked(picked_toolchain)?
    } else {
        default_toolchain
    };
    let is_remote = docker::Engine::is_remote();
    let engine = docker::Engine::new(None, Some(is_remote), msg_info)?;
    let image = image.to_definite_with(&engine, msg_info)?;
    toolchain.replace_host(&image.platform);
    Ok(Some(CrossSetup {
        config,
        target,
        uses_xargo,
        uses_zig,
        build_std,
        zig_version,
        toolchain,
        is_remote,
        engine,
        image,
    }))
}

#[derive(Debug)]
pub struct CrossSetup {
    pub config: Config,
    pub target: Target,
    pub uses_xargo: bool,
    pub uses_zig: bool,
    pub build_std: BuildStd,
    pub zig_version: Option<String>,
    pub toolchain: QualifiedToolchain,
    pub is_remote: bool,
    pub engine: docker::Engine,
    pub image: docker::Image,
}

#[derive(PartialEq, Eq, Debug)]
pub(crate) enum VersionMatch {
    Same,
    OlderTarget,
    NewerTarget,
    Different,
}

pub(crate) fn warn_host_version_mismatch(
    host_version_meta: &rustc_version::VersionMeta,
    toolchain: &QualifiedToolchain,
    rustc_version: &rustc_version::Version,
    rustc_commit: &str,
    msg_info: &mut MessageInfo,
) -> Result<VersionMatch> {
    let host_commit = host_version_meta.short_version_string.splitn(3, ' ').nth(2);
    let rustc_commit_date = rustc_commit
        .split_once(' ')
        .and_then(|x| x.1.strip_suffix(')'));

    if rustc_version != &host_version_meta.semver || (Some(rustc_commit) != host_commit) {
        let versions = rustc_version.cmp(&host_version_meta.semver);
        let dates = rustc_commit_date.cmp(&host_version_meta.commit_date.as_deref());

        let rustc_warning = format!(
            "rustc `{rustc_version} {rustc_commit}` for the target. Current active rustc on the host is `{}`",
            host_version_meta.short_version_string
        );
        if versions.is_lt() || (versions.is_eq() && dates.is_lt()) {
            if cfg!(not(test)) {
                msg_info.info(format_args!("using older {rustc_warning}.\n > Update with `rustup update --force-non-host {toolchain}`"))?;
            }
            return Ok(VersionMatch::OlderTarget);
        } else if versions.is_gt() || (versions.is_eq() && dates.is_gt()) {
            if cfg!(not(test)) {
                msg_info.info(format_args!(
                    "using newer {rustc_warning}.\n > Update with `rustup update`"
                ))?;
            }
            return Ok(VersionMatch::NewerTarget);
        } else {
            if cfg!(not(test)) {
                msg_info.info(format_args!("using {rustc_warning}."))?;
            }
            return Ok(VersionMatch::Different);
        }
    }
    Ok(VersionMatch::Same)
}

pub const fn commit_info() -> &'static str {
    commit_info!()
}

#[macro_export]
macro_rules! commit_info {
    () => {
        include_str!(concat!(env!("OUT_DIR"), "/commit-info.txt"))
    };
}

/// Obtains the [`CrossToml`] from one of the possible locations
///
/// These locations are checked in the following order:
/// 1. If the `CROSS_CONFIG` variable is set, it tries to read the config from its value
/// 2. Otherwise, the `Cross.toml` in the project root is used
/// 3. Package and workspace metadata in the Cargo.toml
///
/// The values from `CROSS_CONFIG` or `Cross.toml` are concatenated with the
/// metadata in `Cargo.toml`, with `Cross.toml` having the highest priority.
pub fn toml(metadata: &CargoMetadata, msg_info: &mut MessageInfo) -> Result<CrossToml> {
    let root = &metadata.workspace_root;
    let cross_config_path = match env::var("CROSS_CONFIG") {
        Ok(var) => PathBuf::from(var),
        Err(_) => root.join("Cross.toml"),
    };

    let mut config = if cross_config_path.exists() {
        let cross_toml_str = file::read(&cross_config_path)
            .wrap_err_with(|| format!("could not read file `{cross_config_path:?}`"))?;

        let (config, _) = CrossToml::parse_from_cross_str(
            &cross_toml_str,
            Some(cross_config_path.to_utf8()?),
            msg_info,
        )
        .wrap_err_with(|| format!("failed to parse file `{cross_config_path:?}` as TOML",))?;

        config
    } else {
        // Checks if there is a lowercase version of this file
        if root.join("cross.toml").exists() {
            msg_info.warn("There's a file named cross.toml, instead of Cross.toml. You may want to rename it, or it won't be considered.")?;
        }
        CrossToml::default()
    };
    let mut found: Option<std::borrow::Cow<'_, str>> = None;

    if let Some(workspace_metadata) = &metadata.metadata {
        let workspace_metadata =
            serde_json::de::from_str::<serde_json::Value>(workspace_metadata.get())?;
        if let Some(cross) = dbg!(workspace_metadata.get("cross")) {
            found = Some(
                metadata
                    .workspace_root
                    .join("Cargo.toml")
                    .to_utf8()?
                    .to_owned()
                    .into(),
            );
            let (workspace_config, _) =
                CrossToml::parse_from_deserializer(cross, found.as_deref(), msg_info)?;
            config = config.merge(workspace_config)?;
        }
    }

    for (package, package_metadata) in metadata
        .packages
        .iter()
        .filter_map(|p| Some((p.manifest_path.as_path(), p.metadata.as_deref()?)))
    {
        let package_metadata =
            serde_json::de::from_str::<serde_json::Value>(package_metadata.get())?;

        if let Some(cross) = package_metadata.get("cross") {
            if let Some(found) = &found {
                msg_info.warn(format_args!("Found conflicting cross configuration in `{}`, use `[workspace.metadata.cross]` in the workspace manifest instead.\nCurrently only using configuration from `{}`", package.to_utf8()?, found))?;
                continue;
            }
            let (workspace_config, _) = CrossToml::parse_from_deserializer(
                cross,
                Some(metadata.workspace_root.join("Cargo.toml").to_utf8()?),
                msg_info,
            )?;
            config = config.merge(workspace_config)?;
            found = Some(package.to_utf8()?.into());
        }
    }

    Ok(config)
}