From c8190078fd3715a1e45d5cf757e565fa710cf048 Mon Sep 17 00:00:00 2001
From: James Braza <jamesbraza@gmail.com>
Date: Wed, 1 Oct 2025 09:22:18 -0700
Subject: [PATCH] Updated saveCache to check for changes in UV_CACHE_DIR

---
 src/save-cache.ts | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/src/save-cache.ts b/src/save-cache.ts
index caf0633..fa1f7e6 100644
--- a/src/save-cache.ts
+++ b/src/save-cache.ts
@@ -52,14 +52,29 @@ async function saveCache(): Promise<void> {
     await pruneCache();
   }
 
-  core.info(`Saving cache path: ${cacheLocalPath}`);
-  if (!fs.existsSync(cacheLocalPath) && !ignoreNothingToCache) {
+  // Check if UV_CACHE_DIR has been changed externally from this action
+  let actualCachePath = cacheLocalPath;
+  if (process.env.UV_CACHE_DIR !== cacheLocalPath) {
+    if (process.env.UV_CACHE_DIR) {
+      core.warning(
+        `The environment variable UV_CACHE_DIR has been changed to "${process.env.UV_CACHE_DIR}", by an action or step running after astral-sh/setup-uv. This can lead to unexpected behavior. If you expected this to happen set the cache-local-path input to "${process.env.UV_CACHE_DIR}" instead of "${cacheLocalPath}".`
+      );
+      actualCachePath = process.env.UV_CACHE_DIR;
+    } else {
+      core.warning(
+        `The environment variable UV_CACHE_DIR has been unset, by an action or step running after astral-sh/setup-uv. This can lead to unexpected behavior. If you expected this to happen unset cache-local-path input from "${cacheLocalPath}".`
+      );
+    }
+  }
+
+  core.info(`Saving cache path: ${actualCachePath}`);
+  if (!fs.existsSync(actualCachePath) && !ignoreNothingToCache) {
     throw new Error(
-      `Cache path ${cacheLocalPath} does not exist on disk. This likely indicates that there are no dependencies to cache. Consider disabling the cache input if it is not needed.`,
+      `Cache path ${actualCachePath} does not exist on disk. This likely indicates that there are no dependencies to cache. Consider disabling the cache input if it is not needed.`,
     );
   }
   try {
-    await cache.saveCache([cacheLocalPath], cacheKey);
+    await cache.saveCache([actualCachePath], cacheKey);
     core.info(`cache saved with the key: ${cacheKey}`);
   } catch (e) {
     if (