diff --git a/cargo-miri/bin.rs b/cargo-miri/bin.rs index 4c0b9e41d3b..1b14d4da9cc 100644 --- a/cargo-miri/bin.rs +++ b/cargo-miri/bin.rs @@ -9,7 +9,7 @@ use std::fmt::Write as _; use std::fs::{self, File}; use std::io::{self, BufRead, BufReader, BufWriter, Read, Write}; -use std::iter::TakeWhile; +use std::iter::{self, TakeWhile}; use std::ops::Not; use std::path::{Path, PathBuf}; use std::process::{self, Command}; @@ -35,6 +35,11 @@ Examples: cargo miri run cargo miri test -- test-suite-filter + + cargo miri setup --print sysroot + This will print the path to the generated sysroot (and nothing else) on stdout. + stderr will still contain progress information about how the build is doing. + "#; #[derive(Clone, Debug)] @@ -206,6 +211,14 @@ fn forward_miri_sysroot(cmd: &mut Command) { cmd.arg(sysroot); } +/// Escapes `s` in a way that is suitable for using it as a string literal in TOML syntax. +fn escape_for_toml(s: &str) -> String { + // We want to surround this string in quotes `"`. So we first escape all quotes, + // and also all backslashes (that are used to escape quotes). + let s = s.replace('\\', r#"\\"#).replace('"', r#"\""#); + format!("\"{}\"", s) +} + /// Returns the path to the `miri` binary fn find_miri() -> PathBuf { if let Some(path) = env::var_os("MIRI") { @@ -353,6 +366,8 @@ fn write_to_file(filename: &Path, content: &str) { /// done all this already. fn setup(subcommand: &MiriCommand) { let only_setup = matches!(subcommand, MiriCommand::Setup); + let ask_user = !only_setup; + let print_sysroot = only_setup && has_arg_flag("--print-sysroot"); // whether we just print the sysroot path if std::env::var_os("MIRI_SYSROOT").is_some() { if only_setup { println!("WARNING: MIRI_SYSROOT already set, not doing anything.") @@ -360,10 +375,6 @@ fn setup(subcommand: &MiriCommand) { return; } - // Subcommands other than `setup` will do a setup if necessary, but - // interactively confirm first. - let ask_user = !only_setup; - // First, we need xargo. if xargo_version().map_or(true, |v| v < XARGO_MIN_VERSION) { if std::env::var_os("XARGO_CHECK").is_some() { @@ -499,8 +510,14 @@ fn setup(subcommand: &MiriCommand) { command.env("RUSTFLAGS", "-Cdebug-assertions=off -Coverflow-checks=on"); // Manage the output the user sees. if only_setup { + // We want to be explicit. eprintln!("Preparing a sysroot for Miri..."); + if print_sysroot { + // Be extra sure there is no noise on stdout. + command.stdout(process::Stdio::null()); + } } else { + // We want to be quiet, but still let the user know that something is happening. eprint!("Preparing a sysroot for Miri... "); command.stdout(process::Stdio::null()); command.stderr(process::Stdio::null()); @@ -515,9 +532,6 @@ fn setup(subcommand: &MiriCommand) { )) } } - if !only_setup { - eprintln!("done"); - } // That should be it! But we need to figure out where xargo built stuff. // Unfortunately, it puts things into a different directory when the @@ -525,12 +539,14 @@ fn setup(subcommand: &MiriCommand) { let sysroot = if target == &host { dir.join("HOST") } else { PathBuf::from(dir) }; std::env::set_var("MIRI_SYSROOT", &sysroot); // pass the env var to the processes we spawn, which will turn it into "--sysroot" flags // Figure out what to print. - let print_sysroot = only_setup && has_arg_flag("--print-sysroot"); // whether we just print the sysroot path + if only_setup { + eprintln!("A sysroot for Miri is now available in `{}`.", sysroot.display()); + } else { + eprintln!("done"); + } if print_sysroot { // Print just the sysroot and nothing else to stdout; this way we do not need any escaping. println!("{}", sysroot.display()); - } else if only_setup { - eprintln!("A sysroot for Miri is now available in `{}`.", sysroot.display()); } } @@ -669,7 +685,11 @@ fn phase_cargo_miri(mut args: impl Iterator) { // describes an alternative // approach that uses `cargo check`, making that part easier but target and binary handling // harder. - let cargo_miri_path = std::env::current_exe().expect("current executable path invalid"); + let cargo_miri_path = std::env::current_exe() + .expect("current executable path invalid") + .into_os_string() + .into_string() + .expect("current executable path is not valid UTF-8"); let cargo_cmd = match subcommand { MiriCommand::Forward(s) => s, MiriCommand::Setup => return, // `cargo miri setup` stops here. @@ -699,20 +719,21 @@ fn phase_cargo_miri(mut args: impl Iterator) { target_dir.push("miri"); cmd.arg("--target-dir").arg(target_dir); - // Make sure we know the build target, and cargo does, too. - // This is needed to make the `CARGO_TARGET_*_RUNNER` env var do something, + // Make sure the build target is explicitly set. + // This is needed to make the `target.runner` settings do something, // and it later helps us detect which crates are proc-macro/build-script // (host crates) and which crates are needed for the program itself. - let host = version_info().host; - let target = get_arg_flag_value("--target"); - let target = if let Some(ref target) = target { - target - } else { - // No target given. Pick default and tell cargo about it. + if get_arg_flag_value("--target").is_none() { + // No target given. Explicitly pick the host. cmd.arg("--target"); - cmd.arg(&host); - &host - }; + cmd.arg(version_info().host); + } + + // Set ourselves as runner for al binaries invoked by cargo. + // We use `all()` since `true` is not a thing in cfg-lang, but the empty conjunction is. :) + let cargo_miri_path_for_toml = escape_for_toml(&cargo_miri_path); + cmd.arg("--config") + .arg(format!("target.'cfg(all())'.runner=[{cargo_miri_path_for_toml}, 'runner']")); // Forward all further arguments after `--` to cargo. cmd.arg("--").args(args); @@ -743,16 +764,6 @@ fn phase_cargo_miri(mut args: impl Iterator) { // bootstrap `rustc` thing in our way! Instead, we have MIRI_HOST_SYSROOT to use for host builds. cmd.env("RUSTC", &fs::canonicalize(find_miri()).unwrap()); - let runner_env_name = - |triple: &str| format!("CARGO_TARGET_{}_RUNNER", triple.to_uppercase().replace('-', "_")); - let host_runner_env_name = runner_env_name(&host); - let target_runner_env_name = runner_env_name(target); - // Set the target runner to us, so we can interpret the binaries. - cmd.env(&target_runner_env_name, &cargo_miri_path); - // Unit tests of `proc-macro` crates are run on the host, so we set the host runner to - // us in order to skip them. - cmd.env(&host_runner_env_name, &cargo_miri_path); - // Set rustdoc to us as well, so we can run doctests. cmd.env("RUSTDOC", &cargo_miri_path); @@ -1194,38 +1205,25 @@ fn main() { return; } - let mut args = args.peekable(); - if args.next_if(|a| a == "miri").is_some() { - phase_cargo_miri(args); - } else if let Some(arg) = args.peek().cloned() { - // Cargo calls us for everything it does. We could be invoked as rustc, rustdoc, or the runner. - - // If the first arg is equal to the RUSTC variable (which should be set at this point), - // then we need to behave as rustc. This is the somewhat counter-intuitive behavior of - // having both RUSTC and RUSTC_WRAPPER set (see - // https://github.com/rust-lang/cargo/issues/10886). - if arg == env::var("RUSTC").unwrap() { - args.next().unwrap(); // consume wrapped RUSTC command. - return phase_rustc(args, RustcPhase::Build); - } - // We have to distinguish the "runner" and "rustdoc" cases. - // As runner, the first argument is the binary (a file that should exist, with an absolute path); - // as rustdoc, the first argument is a flag (`--something`). - let binary = Path::new(&arg); - if binary.exists() { - assert!(!arg.starts_with("--")); // not a flag - phase_runner(args, RunnerPhase::Cargo); - } else if arg.starts_with("--") { - phase_rustdoc(args); - } else { - show_error(format!( - "`cargo-miri` called with unexpected first argument `{}`; please only invoke this binary through `cargo miri`", - arg - )); - } - } else { + let Some(first) = args.next() else { show_error(format!( "`cargo-miri` called without first argument; please only invoke this binary through `cargo miri`" - )); + )) + }; + match first.as_str() { + "miri" => phase_cargo_miri(args), + "runner" => phase_runner(args, RunnerPhase::Cargo), + arg if arg == env::var("RUSTC").unwrap() => { + // If the first arg is equal to the RUSTC env ariable (which should be set at this + // point), then we need to behave as rustc. This is the somewhat counter-intuitive + // behavior of having both RUSTC and RUSTC_WRAPPER set + // (see https://github.com/rust-lang/cargo/issues/10886). + phase_rustc(args, RustcPhase::Build) + } + _ => { + // Everything else must be rustdoc. But we need to get `first` "back onto the iterator", + // it is some part of the rustdoc invocation. + phase_rustdoc(iter::once(first).chain(args)); + } } } diff --git a/miri b/miri index 463e4607bae..8bef9d1291a 100755 --- a/miri +++ b/miri @@ -131,9 +131,6 @@ export RUSTFLAGS="-C link-args=-Wl,-rpath,$LIBDIR $RUSTFLAGS" # Build a sysroot and set MIRI_SYSROOT to use it. Arguments are passed to `cargo miri setup`. build_sysroot() { - # Build once, for the user to see. - $CARGO run $CARGO_EXTRA_FLAGS --manifest-path "$MIRIDIR"/cargo-miri/Cargo.toml -- miri setup "$@" - # Call again, to just set env var. export MIRI_SYSROOT="$($CARGO run $CARGO_EXTRA_FLAGS --manifest-path "$MIRIDIR"/cargo-miri/Cargo.toml -q -- miri setup --print-sysroot "$@")" }