From 62ceed92fc7acea441d5b1ff6a4ad4e0a8826e55 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jakub=20Ber=C3=A1nek?= <berykubik@gmail.com>
Date: Wed, 28 May 2025 13:31:36 +0200
Subject: [PATCH] Improve error message when `perf-config.json` is not found

Before it was quite hard to figure out what is happening.
---
 site/build.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/site/build.rs b/site/build.rs
index 7e9acc30b..6a77cc8b8 100644
--- a/site/build.rs
+++ b/site/build.rs
@@ -46,7 +46,12 @@ fn main() -> Result<(), Box<dyn Error>> {
 
         // Load perf-config.json
         let config_path = compile_benchmark.path().join("perf-config.json");
-        let config_contents = std::fs::read_to_string(config_path)?;
+        let config_contents = std::fs::read_to_string(&config_path).map_err(|e| {
+            format!(
+                "Cannot read perf-config.json file at {}: {e:?}",
+                config_path.display()
+            )
+        })?;
         let config = serde_json::from_str::<serde_json::Value>(&config_contents)?;
 
         // Load Cargo manifest to find profile information