Make the cache dir wherever uv is called from when --no-cache specified

crates/uv-cache/src/cli.rs

@@ -42,7 +42,7 @@ impl Cache {
     /// Returns an absolute cache dir.
     pub fn from_settings(no_cache: bool, cache_dir: Option<PathBuf>) -> Result<Self, io::Error> {
         if no_cache {
-            Self::temp()
+            Self::temp(cache_dir)
         } else if let Some(cache_dir) = cache_dir {
             Ok(Self::from_path(cache_dir))
         } else if let Some(cache_dir) = uv_dirs::legacy_user_cache_dir().filter(|dir| dir.exists())

crates/uv-cache/src/lib.rs

@@ -155,8 +155,11 @@ impl Cache {
     }
 
     /// Create a temporary cache directory.
-    pub fn temp() -> Result<Self, io::Error> {
-        let temp_dir = tempfile::tempdir()?;
+    pub fn temp(cache_dir: Option<PathBuf>) -> Result<Self, io::Error> {
+        let temp_dir = match cache_dir {
+            Some(dir) => tempfile::tempdir_in(dir)?,
+            None => tempfile::tempdir_in("")?,
+        };
         Ok(Self {
             root: temp_dir.path().to_path_buf(),
             refresh: Refresh::None(Timestamp::now()),

crates/uv-client/src/registry_client.rs

@@ -181,7 +181,7 @@ impl<'a> TryFrom<BaseClientBuilder<'a>> for RegistryClientBuilder<'a> {
         Ok(Self {
             index_urls: IndexUrls::default(),
             index_strategy: IndexStrategy::default(),
-            cache: Cache::temp()?,
+            cache: Cache::temp(None)?,
             base_client_builder: value,
         })
     }

crates/uv-client/tests/it/remote_metadata.rs

@@ -11,7 +11,7 @@ use uv_pep508::VerbatimUrl;
 
 #[tokio::test]
 async fn remote_metadata_with_and_without_cache() -> Result<()> {
-    let cache = Cache::temp()?.init()?;
+    let cache = Cache::temp(None)?.init()?;
     let client = RegistryClientBuilder::new(cache).build();
 
     // The first run is without cache (the tempdir is empty), the second has the cache from the

crates/uv-client/tests/it/user_agent_version.rs

@@ -50,7 +50,7 @@ async fn test_user_agent_has_version() -> Result<()> {
     });
 
     // Initialize uv-client
-    let cache = Cache::temp()?.init()?;
+    let cache = Cache::temp(None)?.init()?;
     let client = RegistryClientBuilder::new(cache).build();
 
     // Send request to our dummy server
@@ -126,7 +126,7 @@ async fn test_user_agent_has_linehaul() -> Result<()> {
     .unwrap();
 
     // Initialize uv-client
-    let cache = Cache::temp()?.init()?;
+    let cache = Cache::temp(None)?.init()?;
     let mut builder = RegistryClientBuilder::new(cache).markers(&markers);
 
     let linux = Platform::new(

crates/uv-python/src/interpreter.rs

@@ -1087,7 +1087,7 @@ mod tests {
         }
     "##};
 
-        let cache = Cache::temp().unwrap().init().unwrap();
+        let cache = Cache::temp(None).unwrap().init().unwrap();
 
         fs::write(
             &mocked_interpreter,

crates/uv-python/src/lib.rs

@@ -145,7 +145,7 @@ mod tests {
 
             Ok(Self {
                 tempdir,
-                cache: Cache::temp()?,
+                cache: Cache::temp(None)?,
                 installations: ManagedPythonInstallations::temp()?,
                 search_path: None,
                 workdir,