Enable Registry Client Builder to be created from Base Client Builder (#4729)

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## Summary

<!-- What's the purpose of the change? What does it do, and why? -->
Addresses https://github.com/astral-sh/uv/issues/4330, to reduce
duplication in the client creation logic.
## Test Plan

<!-- How was it tested? -->
https://github.com/astral-sh/uv/pull/4729#issuecomment-2204681655

crates/uv-client/src/registry_client.rs

@@ -37,14 +37,8 @@ use crate::{CachedClient, CachedClientError, Error, ErrorKind};
 pub struct RegistryClientBuilder<'a> {
     index_urls: IndexUrls,
     index_strategy: IndexStrategy,
-    keyring: KeyringProviderType,
-    native_tls: bool,
-    retries: u32,
-    connectivity: Connectivity,
     cache: Cache,
-    client: Option<Client>,
-    markers: Option<&'a MarkerEnvironment>,
-    platform: Option<&'a Platform>,
+    base_client_builder: BaseClientBuilder<'a>,
 }
 
 impl RegistryClientBuilder<'_> {
@@ -52,14 +46,8 @@ impl RegistryClientBuilder<'_> {
         Self {
             index_urls: IndexUrls::default(),
             index_strategy: IndexStrategy::default(),
-            keyring: KeyringProviderType::default(),
-            native_tls: false,
             cache,
-            connectivity: Connectivity::Online,
-            retries: 3,
-            client: None,
-            markers: None,
-            platform: None,
+            base_client_builder: BaseClientBuilder::new(),
         }
     }
 }
@@ -79,25 +67,25 @@ impl<'a> RegistryClientBuilder<'a> {
 
     #[must_use]
     pub fn keyring(mut self, keyring_type: KeyringProviderType) -> Self {
-        self.keyring = keyring_type;
+        self.base_client_builder = self.base_client_builder.keyring(keyring_type);
         self
     }
 
     #[must_use]
     pub fn connectivity(mut self, connectivity: Connectivity) -> Self {
-        self.connectivity = connectivity;
+        self.base_client_builder = self.base_client_builder.connectivity(connectivity);
         self
     }
 
     #[must_use]
     pub fn retries(mut self, retries: u32) -> Self {
-        self.retries = retries;
+        self.base_client_builder = self.base_client_builder.retries(retries);
         self
     }
 
     #[must_use]
     pub fn native_tls(mut self, native_tls: bool) -> Self {
-        self.native_tls = native_tls;
+        self.base_client_builder = self.base_client_builder.native_tls(native_tls);
         self
     }
 
@@ -109,44 +97,27 @@ impl<'a> RegistryClientBuilder<'a> {
 
     #[must_use]
     pub fn client(mut self, client: Client) -> Self {
-        self.client = Some(client);
+        self.base_client_builder = self.base_client_builder.client(client);
         self
     }
 
     #[must_use]
     pub fn markers(mut self, markers: &'a MarkerEnvironment) -> Self {
-        self.markers = Some(markers);
+        self.base_client_builder = self.base_client_builder.markers(markers);
         self
     }
 
     #[must_use]
     pub fn platform(mut self, platform: &'a Platform) -> Self {
-        self.platform = Some(platform);
+        self.base_client_builder = self.base_client_builder.platform(platform);
         self
     }
 
     pub fn build(self) -> RegistryClient {
         // Build a base client
-        let mut builder = BaseClientBuilder::new();
+        let builder = self.base_client_builder;
 
-        if let Some(client) = self.client {
-            builder = builder.client(client);
-        }
-
-        if let Some(markers) = self.markers {
-            builder = builder.markers(markers);
-        }
-
-        if let Some(platform) = self.platform {
-            builder = builder.platform(platform);
-        }
-
-        let client = builder
-            .retries(self.retries)
-            .connectivity(self.connectivity)
-            .native_tls(self.native_tls)
-            .keyring(self.keyring)
-            .build();
+        let client = builder.build();
 
         let timeout = client.timeout();
         let connectivity = client.connectivity();
@@ -165,6 +136,17 @@ impl<'a> RegistryClientBuilder<'a> {
     }
 }
 
+impl<'a> From<BaseClientBuilder<'a>> for RegistryClientBuilder<'a> {
+    fn from(value: BaseClientBuilder<'a>) -> Self {
+        Self {
+            index_urls: IndexUrls::default(),
+            index_strategy: IndexStrategy::default(),
+            cache: Cache::temp().unwrap(),
+            base_client_builder: value,
+        }
+    }
+}
+
 /// A client for fetching packages from a `PyPI`-compatible index.
 #[derive(Debug, Clone)]
 pub struct RegistryClient {

crates/uv/src/commands/pip/compile.rs

@@ -257,12 +257,11 @@ pub(crate) async fn pip_compile(
     }
 
     // Initialize the registry client.
-    let client = RegistryClientBuilder::new(cache.clone())
-        .native_tls(native_tls)
-        .connectivity(connectivity)
+
+    let client = RegistryClientBuilder::from(client_builder)
+        .cache(cache.clone())
         .index_urls(index_locations.index_urls())
         .index_strategy(index_strategy)
-        .keyring(keyring_provider)
         .markers(interpreter.markers())
         .platform(interpreter.platform())
         .build();

crates/uv/src/commands/pip/install.rs

@@ -256,12 +256,10 @@ pub(crate) async fn pip_install(
     }
 
     // Initialize the registry client.
-    let client = RegistryClientBuilder::new(cache.clone())
-        .native_tls(native_tls)
-        .connectivity(connectivity)
+    let client = RegistryClientBuilder::from(client_builder)
+        .cache(cache.clone())
         .index_urls(index_locations.index_urls())
         .index_strategy(index_strategy)
-        .keyring(keyring_provider)
         .markers(&markers)
         .platform(interpreter.platform())
         .build();

crates/uv/src/commands/pip/sync.rs

@@ -203,12 +203,10 @@ pub(crate) async fn pip_sync(
     }
 
     // Initialize the registry client.
-    let client = RegistryClientBuilder::new(cache.clone())
-        .native_tls(native_tls)
-        .connectivity(connectivity)
+    let client = RegistryClientBuilder::from(client_builder)
+        .cache(cache.clone())
         .index_urls(index_locations.index_urls())
         .index_strategy(index_strategy)
-        .keyring(keyring_provider)
         .markers(&markers)
         .platform(interpreter.platform())
         .build();

crates/uv/src/commands/project/add.rs

@@ -94,12 +94,9 @@ pub(crate) async fn add(
         resolution_environment(python_version, python_platform, venv.interpreter())?;
 
     // Initialize the registry client.
-    let client = RegistryClientBuilder::new(cache.clone())
-        .native_tls(native_tls)
-        .connectivity(connectivity)
+    let client = RegistryClientBuilder::from(client_builder)
         .index_urls(settings.index_locations.index_urls())
         .index_strategy(settings.index_strategy)
-        .keyring(settings.keyring_provider)
         .markers(&markers)
         .platform(venv.interpreter().platform())
         .build();

crates/uv/src/commands/venv.rs

@@ -129,6 +129,8 @@ async fn venv_impl(
         .connectivity(connectivity)
         .native_tls(native_tls);
 
+    let client_builder_clone = client_builder.clone();
+
     let mut interpreter_request = python_request.map(PythonRequest::parse);
     if preview.is_enabled() && interpreter_request.is_none() {
         interpreter_request = request_from_version_file().await.into_diagnostic()?;
@@ -184,12 +186,11 @@ async fn venv_impl(
         let interpreter = venv.interpreter();
 
         // Instantiate a client.
-        let client = RegistryClientBuilder::new(cache.clone())
-            .native_tls(native_tls)
+        let client = RegistryClientBuilder::from(client_builder_clone)
+            .cache(cache.clone())
             .index_urls(index_locations.index_urls())
             .index_strategy(index_strategy)
             .keyring(keyring_provider)
-            .connectivity(connectivity)
             .markers(interpreter.markers())
             .platform(interpreter.platform())
             .build();