Get the path to cargo from rustbuild

src/bootstrap/test.rs

@@ -528,6 +528,7 @@ impl Step for Tidy {
         println!("tidy check ({})", host);
         let mut cmd = builder.tool_cmd(Tool::Tidy);
         cmd.arg(build.src.join("src"));
+        cmd.arg(&build.initial_cargo);
         if !build.config.vendor {
             cmd.arg("--no-vendor");
         }

src/tools/tidy/src/deps.rs

@@ -426,9 +426,9 @@ pub fn check(path: &Path, bad: &mut bool) {
 /// Checks the dependency at the given path. Changes `bad` to `true` if a check failed.
 ///
 /// Specifically, this checks that the dependencies are on the whitelist.
-pub fn check_whitelist(path: &Path, bad: &mut bool) {
+pub fn check_whitelist(path: &Path, cargo: &Path, bad: &mut bool) {
     // Check dependencies
-    let deps: HashSet<_> = get_deps(&path)
+    let deps: HashSet<_> = get_deps(&path, &cargo)
         .into_iter()
         .map(|Package { name, version, .. }| (name, version))
         .collect();
@@ -492,10 +492,9 @@ fn extract_license(line: &str) -> String {
 }
 
 /// Get the dependencies of the crate at the given path using `cargo metadata`.
-fn get_deps(path: &Path) -> Vec<Package> {
+fn get_deps(path: &Path, cargo: &Path) -> Vec<Package> {
     // Run `cargo metadata` to get the set of dependencies
-    println!("Getting metadata from {:?}", path.join("Cargo.toml"));
-    let output = Command::new("cargo")
+    let output = Command::new(cargo)
         .arg("metadata")
         .arg("--format-version")
         .arg("1")

src/tools/tidy/src/main.rs

@@ -24,9 +24,12 @@ use std::path::PathBuf;
 use std::env;
 
 fn main() {
-    let path = env::args_os().skip(1).next().expect("need an argument");
+    let path = env::args_os().skip(1).next().expect("need path to src");
     let path = PathBuf::from(path);
 
+    let cargo = env::args_os().skip(2).next().expect("need path to cargo");
+    let cargo = PathBuf::from(cargo);
+
     let args: Vec<String> = env::args().skip(1).collect();
 
     let mut bad = false;
@@ -41,7 +44,7 @@ fn main() {
     if !args.iter().any(|s| *s == "--no-vendor") {
         deps::check(&path, &mut bad);
     }
-    deps::check_whitelist(&path, &mut bad);
+    deps::check_whitelist(&path, &cargo, &mut bad);
 
     if bad {
         eprintln!("some tidy checks failed");