From 47eb6ee42b046338b91a9c0131b6283a348ff12d Mon Sep 17 00:00:00 2001
From: Zanie Blue <contact@zanie.dev>
Date: Wed, 3 Jul 2024 08:36:46 -0400
Subject: [PATCH] Fix cache key collisions for paths with separators (#12159)

Closes https://github.com/astral-sh/ruff/issues/12158

Hashing `Path` does not take into account path separators so `foo/bar`
is the same as `foobar` which is no good for our case. I'm guessing this
is an upstream bug, perhaps introduced by
https://github.com/rust-lang/rust/commit/45082b077b4991361f451701d0a9467ce123acdf?
I'm investigating that further.
---
 crates/ruff_cache/src/cache_key.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/crates/ruff_cache/src/cache_key.rs b/crates/ruff_cache/src/cache_key.rs
index 1208c40100..de66961dce 100644
--- a/crates/ruff_cache/src/cache_key.rs
+++ b/crates/ruff_cache/src/cache_key.rs
@@ -350,7 +350,9 @@ impl<K: CacheKey + Ord, V: CacheKey> CacheKey for BTreeMap<K, V> {
 impl CacheKey for Path {
     #[inline]
     fn cache_key(&self, state: &mut CacheKeyHasher) {
-        self.hash(&mut *state);
+        for component in self.components() {
+            component.hash(&mut *state);
+        }
     }
 }