tidy: add check to verify paths in triagebot.toml

Author: klensy

Cargo.lock

@@ -5257,6 +5257,7 @@ dependencies = [
  "serde",
  "similar",
  "termcolor",
+ "toml 0.7.8",
  "walkdir",
 ]
 

src/tools/tidy/Cargo.toml

@@ -17,6 +17,7 @@ termcolor = "1.1.3"
 rustc-hash = "2.0.0"
 fluent-syntax = "0.11.1"
 similar = "2.5.0"
+toml = "0.7.8"
 
 [features]
 build-metrics = ["dep:serde"]

src/tools/tidy/src/lib.rs

@@ -88,6 +88,7 @@ pub mod target_policy;
 pub mod target_specific_tests;
 pub mod tests_placement;
 pub mod tests_revision_unpaired_stdout_stderr;
+pub mod triagebot;
 pub mod ui_tests;
 pub mod unit_tests;
 pub mod unknown_revision;

src/tools/tidy/src/main.rs

@@ -146,6 +146,8 @@ fn main() {
 
         check!(x_version, &root_path, &cargo);
 
+        check!(triagebot, &root_path);
+
         let collected = {
             drain_handles(&mut handles);
 

src/tools/tidy/src/triagebot.rs

@@ -0,0 +1,54 @@
+//! Tidy check to ensure paths mentioned in triagebot.toml exist in the project.
+
+use std::path::Path;
+
+use toml::Value;
+
+pub fn check(path: &Path, bad: &mut bool) {
+    let triagebot_path = path.join("triagebot.toml");
+    if !triagebot_path.exists() {
+        tidy_error!(bad, "triagebot.toml file not found");
+        return;
+    }
+
+    let contents = std::fs::read_to_string(&triagebot_path).unwrap();
+    let config: Value = toml::from_str(&contents).unwrap();
+
+    // Check [mentions."*"] sections, i.e. [mentions."compiler/rustc_const_eval/src/"]
+    if let Some(Value::Table(mentions)) = config.get("mentions") {
+        for path_str in mentions.keys() {
+            // Remove quotes from the path
+            let clean_path = path_str.trim_matches('"');
+            let full_path = path.join(clean_path);
+
+            if !full_path.exists() {
+                tidy_error!(
+                    bad,
+                    "triagebot.toml [mentions.*] contains path '{}' which doesn't exist",
+                    clean_path
+                );
+            }
+        }
+    }
+
+    // Check [assign.owners] sections, i.e.
+    // [assign.owners]
+    // "/.github/workflows" = ["infra-ci"]
+    if let Some(Value::Table(assign)) = config.get("assign") {
+        if let Some(Value::Table(owners)) = assign.get("owners") {
+            for path_str in owners.keys() {
+                // Remove quotes and leading slash from the path
+                let clean_path = path_str.trim_matches('"').trim_start_matches('/');
+                let full_path = path.join(clean_path);
+
+                if !full_path.exists() {
+                    tidy_error!(
+                        bad,
+                        "triagebot.toml [assign.owners] contains path '{}' which doesn't exist",
+                        clean_path
+                    );
+                }
+            }
+        }
+    }
+}