Add ./miri run-dep for running a file with test dependencies available

Cargo.toml

@@ -39,7 +39,7 @@ libloading = "0.7"
 
 [dev-dependencies]
 colored = "2"
-ui_test = "0.9"
+ui_test = "0.10"
 rustc_version = "0.4"
 # Features chosen to match those required by env_logger, to avoid rebuilds
 regex = { version = "1.5.5", default-features = false, features = ["perf", "std"] }

miri

@@ -306,7 +306,7 @@ test|bless)
     # Only in root project as `cargo-miri` has no tests.
     $CARGO test $CARGO_EXTRA_FLAGS --manifest-path "$MIRIDIR"/Cargo.toml "$@"
     ;;
-run)
+run|run-dep)
     # Scan for "--target" to overwrite the "MIRI_TEST_TARGET" env var so
     # that we set the MIRI_SYSROOT up the right way.
     FOUND_TARGET_OPT=0
@@ -323,11 +323,17 @@ run)
         # Make sure Miri actually uses this target.
         MIRIFLAGS="$MIRIFLAGS --target $MIRI_TEST_TARGET"
     fi
+
     # First build and get a sysroot.
     $CARGO build $CARGO_EXTRA_FLAGS --manifest-path "$MIRIDIR"/Cargo.toml
     find_sysroot
     # Then run the actual command.
-    exec $CARGO run $CARGO_EXTRA_FLAGS --manifest-path "$MIRIDIR"/Cargo.toml -- $MIRIFLAGS "$@"
+
+    if [ "$COMMAND" = "run-dep" ]; then
+        exec $CARGO test --test compiletest $CARGO_EXTRA_FLAGS --manifest-path "$MIRIDIR"/Cargo.toml -- --miri-run-dep-mode $MIRIFLAGS "$@"
+    else
+        exec $CARGO run $CARGO_EXTRA_FLAGS --manifest-path "$MIRIDIR"/Cargo.toml -- $MIRIFLAGS "$@"
+    fi
     ;;
 fmt)
     find "$MIRIDIR" -not \( -name target -prune \) -name '*.rs' \

tests/compiletest.rs

@@ -1,5 +1,6 @@
 use colored::*;
 use regex::bytes::Regex;
+use std::ffi::OsString;
 use std::path::{Path, PathBuf};
 use std::{env, process::Command};
 use ui_test::status_emitter::StatusEmitter;
@@ -45,7 +46,7 @@ fn build_so_for_c_ffi_tests() -> PathBuf {
     so_file_path
 }
 
-fn run_tests(mode: Mode, path: &str, target: &str, with_dependencies: bool) -> Result<()> {
+fn test_config(target: &str, path: &str, mode: Mode, with_dependencies: bool) -> Config {
     // Miri is rustc-like, so we create a default builder for rustc and modify it
     let mut program = CommandBuilder::rustc();
     program.program = miri_path();
@@ -103,6 +104,26 @@ fn run_tests(mode: Mode, path: &str, target: &str, with_dependencies: bool) -> R
         ..Config::default()
     };
 
+    let use_std = env::var_os("MIRI_NO_STD").is_none();
+
+    if with_dependencies && use_std {
+        config.dependencies_crate_manifest_path =
+            Some(Path::new("test_dependencies").join("Cargo.toml"));
+        config.dependency_builder.args = vec![
+            "run".into(),
+            "--manifest-path".into(),
+            "cargo-miri/Cargo.toml".into(),
+            "--".into(),
+            "miri".into(),
+            "run".into(), // There is no `cargo miri build` so we just use `cargo miri run`.
+        ];
+    }
+    config
+}
+
+fn run_tests(mode: Mode, path: &str, target: &str, with_dependencies: bool) -> Result<()> {
+    let mut config = test_config(target, path, mode, with_dependencies);
+
     // Handle command-line arguments.
     let mut after_dashdash = false;
     config.path_filter.extend(std::env::args().skip(1).filter(|arg| {
@@ -126,21 +147,6 @@ fn run_tests(mode: Mode, path: &str, target: &str, with_dependencies: bool) -> R
         }
     }));
 
-    let use_std = env::var_os("MIRI_NO_STD").is_none();
-
-    if with_dependencies && use_std {
-        config.dependencies_crate_manifest_path =
-            Some(Path::new("test_dependencies").join("Cargo.toml"));
-        config.dependency_builder.args = vec![
-            "run".into(),
-            "--manifest-path".into(),
-            "cargo-miri/Cargo.toml".into(),
-            "--".into(),
-            "miri".into(),
-            "run".into(), // There is no `cargo miri build` so we just use `cargo miri run`.
-        ];
-    }
-
     eprintln!("   Compiler: {}", config.program.display());
     ui_test::run_tests_generic(
         config,
@@ -226,8 +232,18 @@ fn get_target() -> String {
 
 fn main() -> Result<()> {
     ui_test::color_eyre::install()?;
+
     let target = get_target();
 
+    let mut args = std::env::args_os();
+
+    // Skip the program name and check whether this is a `./miri run-dep` invocation
+    if let Some(first) = args.nth(1) {
+        if first == "--miri-run-dep-mode" {
+            return run_dep_mode(target, args);
+        }
+    }
+
     // Add a test env var to do environment communication tests.
     env::set_var("MIRI_ENV_VAR_TEST", "0");
     // Let the tests know where to store temp files (they might run for a different target, which can make this hard to find).
@@ -250,6 +266,21 @@ fn main() -> Result<()> {
     Ok(())
 }
 
+fn run_dep_mode(target: String, mut args: impl Iterator<Item = OsString>) -> Result<()> {
+    let path = args.next().expect("./miri run-dep must be followed by a file name");
+    let mut config = test_config(&target, "", Mode::Yolo, /* with dependencies */ true);
+    config.program.args.remove(0); // remove the `--error-format=json` argument
+    config.program.args.push("--color".into());
+    config.program.args.push("always".into());
+    let mut cmd = ui_test::test_command(config, Path::new(&path))?;
+    // Separate the arguments to the `cargo miri` invocation from
+    // the arguments to the interpreted prog
+    cmd.arg("--");
+    cmd.args(args);
+    println!("{cmd:?}");
+    if cmd.spawn()?.wait()?.success() { Ok(()) } else { std::process::exit(1) }
+}
+
 /// This is a custom renderer for `ui_test` output that does not emit github actions
 /// `group`s, while still producing regular github actions messages on test failures.
 struct TextAndGha;