Query the interpreter for virtual environments

When a virtual environment is created, `sys.path` is modified. Instead
of reusing the base interpreter's `sys.path`, query the interpreter
again to get the new `sys.path` values.

crates/uv-build-frontend/Cargo.toml

@@ -17,6 +17,7 @@ doctest = false
 workspace = true
 
 [dependencies]
+uv-cache = { workspace = true }
 uv-configuration = { workspace = true }
 uv-distribution = { workspace = true }
 uv-distribution-types = { workspace = true }

crates/uv-build-frontend/src/lib.rs

@@ -26,6 +26,7 @@ use tokio::process::Command;
 use tokio::sync::{Mutex, Semaphore};
 use tracing::{debug, info_span, instrument, Instrument};
 
+use uv_cache::Cache;
 use uv_configuration::{BuildKind, BuildOutput, ConfigSettings, LowerBound, SourceStrategy};
 use uv_distribution::BuildRequires;
 use uv_distribution_types::{IndexLocations, Resolution};
@@ -260,6 +261,7 @@ impl SourceBuild {
         mut environment_variables: FxHashMap<OsString, OsString>,
         level: BuildOutput,
         concurrent_builds: usize,
+        cache: &Cache,
     ) -> Result<Self, Error> {
         let temp_dir = build_context.cache().venv_dir()?;
 
@@ -302,6 +304,7 @@ impl SourceBuild {
                 temp_dir.path(),
                 interpreter.clone(),
                 uv_virtualenv::Prompt::None,
+                cache,
                 false,
                 false,
                 false,

crates/uv-dispatch/src/lib.rs

@@ -430,6 +430,7 @@ impl BuildContext for BuildDispatch<'_> {
             self.build_extra_env_vars.clone(),
             build_output,
             self.concurrency.builds,
+            self.cache,
         )
         .boxed_local()
         .await?;

crates/uv-tool/src/lib.rs

@@ -251,6 +251,7 @@ impl InstalledTools {
         &self,
         name: &PackageName,
         interpreter: Interpreter,
+        cache: &Cache,
     ) -> Result<PythonEnvironment, Error> {
         let environment_path = self.tool_dir(name);
 
@@ -276,6 +277,7 @@ impl InstalledTools {
             &environment_path,
             interpreter,
             uv_virtualenv::Prompt::None,
+            cache,
             false,
             false,
             false,

crates/uv-virtualenv/Cargo.toml

@@ -20,6 +20,7 @@ doctest = false
 workspace = true
 
 [dependencies]
+uv-cache = { workspace = true }
 uv-fs = { workspace = true }
 uv-platform-tags = { workspace = true }
 uv-pypi-types = { workspace = true }

crates/uv-virtualenv/src/lib.rs

@@ -3,6 +3,7 @@ use std::path::Path;
 
 use thiserror::Error;
 
+use uv_cache::Cache;
 use uv_platform_tags::PlatformError;
 use uv_python::{Interpreter, PythonEnvironment};
 
@@ -12,6 +13,8 @@ mod virtualenv;
 pub enum Error {
     #[error(transparent)]
     Io(#[from] io::Error),
+    #[error(transparent)]
+    InterpreterQuery(#[from] uv_python::InterpreterError),
     #[error("Failed to determine Python interpreter to use")]
     Discovery(#[from] uv_python::DiscoveryError),
     #[error("Failed to determine Python interpreter to use")]
@@ -51,6 +54,7 @@ pub fn create_venv(
     location: &Path,
     interpreter: Interpreter,
     prompt: Prompt,
+    cache: &Cache,
     system_site_packages: bool,
     allow_existing: bool,
     relocatable: bool,
@@ -68,6 +72,6 @@ pub fn create_venv(
     )?;
 
     // Create the corresponding `PythonEnvironment`.
-    let interpreter = interpreter.with_virtualenv(virtualenv);
+    let interpreter = Interpreter::query(virtualenv.executable, cache)?;
     Ok(PythonEnvironment::from_interpreter(interpreter))
 }

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

@@ -184,6 +184,7 @@ impl CachedEnvironment {
             temp_dir.path(),
             interpreter,
             uv_virtualenv::Prompt::None,
+            cache,
             false,
             false,
             true,

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

@@ -956,6 +956,7 @@ pub(crate) async fn get_or_init_environment(
                 &venv,
                 interpreter,
                 prompt,
+                cache,
                 false,
                 false,
                 false,

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

@@ -430,6 +430,7 @@ pub(crate) async fn run(
                     temp_dir.path(),
                     interpreter,
                     uv_virtualenv::Prompt::None,
+                    cache,
                     false,
                     false,
                     false,
@@ -648,6 +649,7 @@ pub(crate) async fn run(
                     temp_dir.path(),
                     interpreter,
                     uv_virtualenv::Prompt::None,
+                    cache,
                     false,
                     false,
                     false,
@@ -881,6 +883,7 @@ pub(crate) async fn run(
                     temp_dir.path(),
                     interpreter,
                     uv_virtualenv::Prompt::None,
+                    cache,
                     false,
                     false,
                     false,
@@ -931,6 +934,7 @@ pub(crate) async fn run(
                     temp_dir.path(),
                     base_interpreter.clone(),
                     uv_virtualenv::Prompt::None,
+                    cache,
                     false,
                     false,
                     false,

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

@@ -531,7 +531,7 @@ pub(crate) async fn install(
             },
         };
 
-        let environment = installed_tools.create_environment(&from.name, interpreter)?;
+        let environment = installed_tools.create_environment(&from.name, interpreter, &cache)?;
 
         // At this point, we removed any existing environment, so we should remove any of its
         // executables.

crates/uv/src/commands/tool/upgrade.rs

@@ -310,7 +310,7 @@ async fn upgrade_tool(
         )
         .await?;
 
-        let environment = installed_tools.create_environment(name, interpreter.clone())?;
+        let environment = installed_tools.create_environment(name, interpreter.clone(), &cache)?;
 
         let environment = sync_environment(
             environment,

crates/uv/src/commands/venv.rs

@@ -257,6 +257,7 @@ async fn venv_impl(
         &path,
         interpreter,
         prompt,
+        cache,
         system_site_packages,
         allow_existing,
         relocatable,