Better missing self update feature

crates/uv-cli/src/lib.rs

@@ -408,7 +408,6 @@ pub enum Commands {
     Cache(CacheNamespace),
     /// Manage the uv executable.
     #[command(name = "self")]
-    #[cfg(feature = "self-update")]
     Self_(SelfNamespace),
     /// Clear the cache, removing all entries or those linked to specific packages.
     #[command(hide = true)]
@@ -449,21 +448,18 @@ pub struct HelpArgs {
 }
 
 #[derive(Args)]
-#[cfg(feature = "self-update")]
 pub struct SelfNamespace {
     #[command(subcommand)]
     pub command: SelfCommand,
 }
 
 #[derive(Subcommand)]
-#[cfg(feature = "self-update")]
 pub enum SelfCommand {
     /// Update uv.
     Update(SelfUpdateArgs),
 }
 
 #[derive(Args, Debug)]
-#[cfg(feature = "self-update")]
 pub struct SelfUpdateArgs {
     /// Update to the specified version. If not provided, uv will update to the latest version.
     pub target_version: Option<String>,

crates/uv/src/lib.rs

@@ -806,6 +806,13 @@ async fn run(mut cli: Cli) -> Result<ExitStatus> {
                     token,
                 }),
         }) => commands::self_update(target_version, token, printer).await,
+        #[cfg(not(feature = "self-update"))]
+        Commands::Self_(_) => {
+            anyhow::bail!(
+                "uv was installed through an external package manager, and self-update \
+                is not available. Please use your package manager to update uv."
+            );
+        }
         Commands::Version { output_format } => {
             commands::version(output_format, &mut stdout())?;
             Ok(ExitStatus::Success)