cargo-rail 0.28.1

Cargo-native Rust workspace engine for affected CI, Rust source-surface analysis, compiler reuse, dependency coherence, exact-SHA releases, and split/sync
Documentation 
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//! Entry point for cargo-rail
//!
//! This is intentionally thin - all logic lives in the library.
use cargo_rail::commands::{self, PreContextDispatch, RailCli};
use cargo_rail::error::{RailError, RailResult, print_error};
use cargo_rail::instrumentation::DiagnosticSession;

use clap::Parser;
use std::time::Instant;

fn main() {
    if let Some(exit_code) = cargo_rail::release::dispatch_credential_provider() {
        std::process::exit(exit_code);
    }
    match cargo_rail::compiler::invocation::dispatch() {
        cargo_rail::compiler::invocation::PreClapDispatch::Cli => {}
        cargo_rail::compiler::invocation::PreClapDispatch::Exit(exit_code) => std::process::exit(exit_code),
    }

    let cli_preparation_started = Instant::now();
    let mut argv = std::env::args_os().collect::<Vec<_>>();
    if argv.get(1).is_some_and(|argument| argument == "rail") {
        argv.remove(1);
    }
    let mut cli = RailCli::parse_from(argv);

    let protocol = if cli.json {
        cargo_rail::output::OutputProtocol::Json
    } else {
        cli.command.output_protocol()
    };
    let redirected_progress =
        protocol == cargo_rail::output::OutputProtocol::Json && cli.command.retains_redirected_progress();
    cargo_rail::output::init(cargo_rail::output::InvocationOutput::capture_protocol_with_progress(
        cli.quiet,
        cli.verbose,
        protocol,
        redirected_progress,
    ));

    // Apply global --json flag to command format fields
    if cli.json
        && let Err(error) = cli.command.apply_json_override()
    {
        error.exit();
    }

    let diagnostics = match DiagnosticSession::start(cli.diagnostics_file.take()) {
        Ok(diagnostics) => diagnostics,
        Err(error) => exit_with_error(error),
    };
    let result = run(cli, cli_preparation_started);
    let diagnostics_result = diagnostics.finish();

    if let Err(error) = result {
        exit_with_error(error);
    }
    if let Err(error) = diagnostics_result {
        exit_with_error(error);
    }
}

fn run(cli: RailCli, cli_preparation_started: Instant) -> RailResult<()> {
    // Get workspace root (from --workspace-root flag or current directory)
    let workspace_root = if let Some(ref root) = cli.workspace_root {
        if root.is_absolute() {
            root.clone()
        } else {
            match std::env::current_dir() {
                Ok(cwd) => cwd.join(root),
                Err(error) => {
                    cargo_rail::error!("failed to get current directory: {}", error);
                    return Err(RailError::ExitWithCode { code: 1 });
                }
            }
        }
    } else {
        match std::env::current_dir() {
            Ok(dir) => dir,
            Err(error) => {
                cargo_rail::error!("failed to get current directory: {}", error);
                return Err(RailError::ExitWithCode { code: 1 });
            }
        }
    };

    // Store config override path for commands that need it
    let config_override = cli.config.as_deref();

    let prepared = commands::try_dispatch_pre_context(cli.command, &workspace_root, config_override, cli.json);
    cargo_rail::instrumentation::record_cli_pre_context_preparation(cli_preparation_started);
    let prepared = match prepared {
        Ok(PreContextDispatch::Handled) => return Ok(()),
        Ok(PreContextDispatch::NeedsContext(prepared)) => prepared,
        Err(error) => return Err(error),
    };

    // Build one workspace context for the selected command.
    let workspace_capture_started = Instant::now();
    let context = prepared.build(&workspace_root);
    cargo_rail::instrumentation::record_workspace_capture_cargo_metadata(workspace_capture_started);
    let (command, ctx, prepared_plan) = context?;
    if let Some(snapshot_id) = ctx.captured_authority_id() {
        cargo_rail::instrumentation::record_snapshot_id(snapshot_id);
    }

    // Dispatch to command handler
    commands::dispatch(command, &ctx, prepared_plan)
}

fn exit_with_error(err: RailError) -> ! {
    if err.is_broken_pipe() {
        std::process::exit(0);
    }
    print_error(&err);
    std::process::exit(err.exit_code().as_i32());
}