Add --force option to uv toolchain install (#4313)

crates/uv/src/cli.rs

@@ -2081,8 +2081,12 @@ pub(crate) struct ToolchainListArgs {
 pub(crate) struct ToolchainInstallArgs {
     /// The toolchain to install.
     ///
-    /// If not provided, the latest available version will be installed.
+    /// If not provided, the latest available version will be installed unless a toolchain was previously installed.
     pub(crate) target: Option<String>,
+
+    /// Force the installation of the toolchain, even if it is already installed.
+    #[arg(long, short)]
+    pub(crate) force: bool,
 }
 
 #[derive(Args)]

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

@@ -16,6 +16,7 @@ use crate::printer::Printer;
 #[allow(clippy::too_many_arguments)]
 pub(crate) async fn install(
     target: Option<String>,
+    force: bool,
     native_tls: bool,
     connectivity: Connectivity,
     preview: PreviewMode,
@@ -58,19 +59,23 @@ pub(crate) async fn install(
             toolchain.key()
         )?;
 
-        if matches!(request, ToolchainRequest::Any) {
-            writeln!(
-                printer.stderr(),
-                "A toolchain is already installed. Use `uv toolchain install <request>` to install a specific toolchain.",
-            )?;
+        if force {
+            writeln!(printer.stderr(), "Forcing reinstallation...")?;
         } else {
-            writeln!(
-                printer.stderr(),
-                "Already installed at {}",
-                toolchain.path().user_display()
-            )?;
+            if matches!(request, ToolchainRequest::Any) {
+                writeln!(
+                    printer.stderr(),
+                    "A toolchain is already installed. Use `uv toolchain install <request>` to install a specific toolchain.",
+                )?;
+            } else {
+                writeln!(
+                    printer.stderr(),
+                    "Already installed at {}",
+                    toolchain.path().user_display()
+                )?;
+            }
+            return Ok(ExitStatus::Success);
         }
-        return Ok(ExitStatus::Success);
     }
 
     // Fill platform information missing from the request

crates/uv/src/main.rs

@@ -740,6 +740,7 @@ async fn run() -> Result<ExitStatus> {
 
             commands::toolchain_install(
                 args.target,
+                args.force,
                 globals.native_tls,
                 globals.connectivity,
                 globals.preview,

crates/uv/src/settings.rs

@@ -249,15 +249,16 @@ impl ToolchainListSettings {
 #[derive(Debug, Clone)]
 pub(crate) struct ToolchainInstallSettings {
     pub(crate) target: Option<String>,
+    pub(crate) force: bool,
 }
 
 impl ToolchainInstallSettings {
     /// Resolve the [`ToolchainInstallSettings`] from the CLI and workspace configuration.
     #[allow(clippy::needless_pass_by_value)]
     pub(crate) fn resolve(args: ToolchainInstallArgs, _workspace: Option<Workspace>) -> Self {
-        let ToolchainInstallArgs { target } = args;
+        let ToolchainInstallArgs { target, force } = args;
 
-        Self { target }
+        Self { target, force }
     }
 }