From 36279f1b631c345d22111809536edf70522d256e Mon Sep 17 00:00:00 2001
From: Alex Macleod <alex@macleod.io>
Date: Thu, 13 Jul 2023 20:06:12 +0000
Subject: [PATCH] Trigger a rebuild when CLIPPY_CONF_DIR changes

---
 src/driver.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/driver.rs b/src/driver.rs
index 1eb288b153a5..ee17feed77a0 100644
--- a/src/driver.rs
+++ b/src/driver.rs
@@ -130,6 +130,13 @@ impl rustc_driver::Callbacks for ClippyCallbacks {
         config.parse_sess_created = Some(Box::new(move |parse_sess| {
             track_clippy_args(parse_sess, &clippy_args_var);
             track_files(parse_sess);
+
+            // Trigger a rebuild if CLIPPY_CONF_DIR changes. The value must be a valid string so
+            // changes between dirs that are invalid UTF-8 will not trigger rebuilds
+            parse_sess.env_depinfo.get_mut().insert((
+                Symbol::intern("CLIPPY_CONF_DIR"),
+                env::var("CLIPPY_CONF_DIR").ok().map(|dir| Symbol::intern(&dir)),
+            ));
         }));
         config.register_lints = Some(Box::new(move |sess, lint_store| {
             // technically we're ~guaranteed that this is none but might as well call anything that