new: Install rustup if it does not exist.

CHANGELOG.md

@@ -2,10 +2,18 @@
 
 ## 0.3.0
 
+#### 🚀 Updates
+
+- Will now attempt to install `rustup` if it does not exist on the current machine.
+
 #### 🐞 Fixes
 
 - Will now respect the `RUSTUP_HOME` environment variable when locating the `.rustup` store.
 
+#### ⚙️ Internal
+
+- Updated dependencies.
+
 ## 0.2.3
 
 #### 🐞 Fixes

Cargo.toml

@@ -12,7 +12,7 @@ crate-type = ['cdylib']
 extism-pdk = "0.3.4"
 proto_pdk = { version = "0.7.7" } # , path = "../../proto/crates/pdk" }
 serde = "1.0.188"
-toml = "0.8.0"
+toml = "0.8.1"
 
 [dev-dependencies]
 proto_pdk_test_utils = { version = "0.8.0" } # , path = "../../proto/crates/pdk-test-utils" }

src/proto.rs

@@ -43,11 +43,35 @@ pub fn native_install(
 ) -> FnResult<Json<NativeInstallOutput>> {
     let env = get_proto_environment()?;
 
-    // Check if rustup is installed (returns `Err` otherwise)
+    // Install rustup if it does not exist
     if !command_exists(&env, "rustup") {
-        return err!(
-            "proto requires `rustup` to be installed and available on PATH to use Rust. Please install it and try again."
-        );
+        host_log!("Installing rustup");
+
+        let is_windows = env.os.is_windows();
+        let script_path = PathBuf::from("/proto/temp").join(if is_windows {
+            "rustup-init.exe"
+        } else {
+            "rustup-init.sh"
+        });
+
+        if !script_path.exists() {
+            fs::write(
+                &script_path,
+                fetch_url_text(if is_windows {
+                    "https://win.rustup.rs"
+                } else {
+                    "https://sh.rustup.rs"
+                })?,
+            )?;
+        }
+
+        exec_command!(ExecCommandInput {
+            command: script_path.to_string_lossy().to_string(),
+            args: vec!["--default-toolchain".into(), "none".into(), "-y".into()],
+            set_executable: true,
+            stream: true,
+            ..ExecCommandInput::default()
+        });
     }
 
     let channel = if input.context.version == "canary" {
@@ -58,7 +82,7 @@ pub fn native_install(
 
     let triple = format!("{}-{}", channel, get_target_triple(&env, NAME)?);
 
-    host_log!("Installing target \"{}\" with rustup", triple);
+    host_log!("Installing target {} with rustup", triple);
 
     // Install if not already installed
     let installed_list = exec_command!(pipe, "rustup", ["toolchain", "list"]);