Uv install python into tools path

src/env_vars.rs

@@ -9,4 +9,7 @@ impl EnvVars {
     pub const PRE_COMMIT_ALLOW_NO_CONFIG: &'static str = "PRE_COMMIT_ALLOW_NO_CONFIG";
     pub const PRE_COMMIT_NO_CONCURRENCY: &'static str = "PRE_COMMIT_NO_CONCURRENCY";
     pub const _PRE_COMMIT_SKIP_POST_CHECKOUT: &'static str = "_PRE_COMMIT_SKIP_POST_CHECKOUT";
+
+    pub const UV_NO_CACHE: &'static str = "UV_NO_CACHE";
+    pub const UV_PYTHON_INSTALL_DIR: &'static str = "UV_PYTHON_INSTALL_DIR";
 }

src/languages/python/impl.rs

@@ -1,13 +1,15 @@
+use std::collections::HashMap;
+use std::path::{Path, PathBuf};
+use std::sync::Arc;
+
 use crate::config::LanguageVersion;
 use crate::env_vars::EnvVars;
 use crate::hook::Hook;
 use crate::languages::python::uv::UvInstaller;
 use crate::languages::LanguageImpl;
 use crate::process::Cmd;
 use crate::run::run_by_batch;
-use std::collections::HashMap;
-use std::path::{Path, PathBuf};
-use std::sync::Arc;
+use crate::store::{Store, ToolBucket};
 
 #[derive(Debug, Copy, Clone)]
 pub struct Python;
@@ -23,17 +25,21 @@ impl LanguageImpl for Python {
 
         let uv = UvInstaller::install().await?;
 
+        let store = Store::from_settings()?;
+        let python_install_dir = store.tools_path(ToolBucket::Python);
+
         let uv_cmd = |summary| {
             #[allow(unused_mut)]
             let mut cmd = Cmd::new(&uv, summary);
             // Don't use cache in Windows, multiple uv instances will conflict with each other.
             // See https://github.com/astral-sh/uv/issues/8664
             #[cfg(windows)]
-            cmd.env("UV_NO_CACHE", "1");
+            cmd.env(EnvVars::UV_NO_CACHE, "1");
+
+            cmd.env(EnvVars::UV_PYTHON_INSTALL_DIR, &python_install_dir);
             cmd
         };
 
-        // TODO: Set uv cache dir? tools dir? python dir?
         // Create venv
         let mut cmd = uv_cmd("create venv");
         cmd.arg("venv").arg(&venv);

src/languages/python/uv.rs

@@ -9,7 +9,7 @@ use tracing::{debug, enabled, trace, warn};
 
 use crate::fs::LockedFile;
 use crate::process::Cmd;
-use crate::store::Store;
+use crate::store::{Store, ToolBucket};
 
 // The version of `uv` to install. Should update periodically.
 const UV_VERSION: &str = "0.5.8";
@@ -207,7 +207,7 @@ impl UvInstaller {
         // 2) Check if `uv` is installed by `prefligit`
         let store = Store::from_settings()?;
 
-        let uv_dir = store.uv_path();
+        let uv_dir = store.tools_path(ToolBucket::Uv);
         let uv = uv_dir.join("uv").with_extension(env::consts::EXE_EXTENSION);
         if uv.is_file() {
             trace!(uv = %uv.display(), "Found managed uv");

src/store.rs

@@ -1,4 +1,5 @@
 use std::path::{Path, PathBuf};
+use std::sync::LazyLock;
 
 use anyhow::Result;
 use rusqlite::Connection;
@@ -29,6 +30,28 @@ pub enum Error {
     Git(#[from] crate::git::Error),
 }
 
+static STORE_HOME: LazyLock<Option<PathBuf>> = LazyLock::new(|| {
+    if let Some(path) = std::env::var_os(EnvVars::PRE_COMMIT_HOME) {
+        debug!(
+            path = %path.to_string_lossy(),
+            "Loading store from PRE_COMMIT_HOME",
+        );
+        Some(path.into())
+    } else if let Some(path) = std::env::var_os(EnvVars::XDG_CACHE_HOME) {
+        let path = PathBuf::from(path).join("pre-commit");
+        debug!(
+            path = %path.to_string_lossy(),
+            "Loading store from XDG_CACHE_HOME",
+        );
+        Some(path)
+    } else {
+        let home = home::home_dir()?;
+        let path = home.join(".cache").join("pre-commit");
+        debug!(path = %path.display(), "Loading store from ~/.cache");
+        Some(path)
+    }
+});
+
 /// A store for managing repos.
 #[derive(Debug)]
 pub struct Store {
@@ -38,25 +61,9 @@ pub struct Store {
 
 impl Store {
     pub fn from_settings() -> Result<Self, Error> {
-        if let Some(path) = std::env::var_os(EnvVars::PRE_COMMIT_HOME) {
-            debug!(
-                path = %path.to_string_lossy(),
-                "Loading store from PRE_COMMIT_HOME",
-            );
-            return Ok(Self::from_path(path));
-        } else if let Some(path) = std::env::var_os(EnvVars::XDG_CACHE_HOME) {
-            let path = PathBuf::from(path).join("pre-commit");
-            debug!(
-                path = %path.to_string_lossy(),
-                "Loading store from XDG_CACHE_HOME",
-            );
-            return Ok(Self::from_path(path));
-        }
-
-        let home = home::home_dir().ok_or(Error::HomeNotFound)?;
-        let path = home.join(".cache").join("pre-commit");
-        debug!(path = %path.display(), "Loading store from ~/.cache");
-        Ok(Self::from_path(path))
+        Ok(Self::from_path(
+            STORE_HOME.as_ref().ok_or(Error::HomeNotFound)?,
+        ))
     }
 
     pub fn from_path(path: impl Into<PathBuf>) -> Self {
@@ -267,8 +274,26 @@ impl Store {
         LockedFile::acquire(self.path.join(".lock"), "store").await
     }
 
-    pub fn uv_path(&self) -> PathBuf {
-        self.path.join("tools").join("uv")
+    /// The path to the tool directory in the store.
+    pub fn tools_path(&self, tool: ToolBucket) -> PathBuf {
+        self.path.join("tools").join(tool.as_str())
+    }
+}
+
+#[derive(Copy, Clone)]
+pub enum ToolBucket {
+    Uv,
+    Python,
+    Node,
+}
+
+impl ToolBucket {
+    pub fn as_str(&self) -> &str {
+        match self {
+            ToolBucket::Uv => "uv",
+            ToolBucket::Python => "python",
+            ToolBucket::Node => "node",
+        }
     }
 }