Install required toolchain

build.rs

@@ -165,6 +165,34 @@ fn build_and_zip_dylint_driver(
     out_dir: PathBuf,
     dylint_driver_dst_file: PathBuf,
 ) -> Result<()> {
+    const NIGHTLY_TOOLCHAIN: &str = "nightly-2022-06-30";
+
+    let mut install_toolchain = Command::new("rustup");
+    install_toolchain
+        .args(vec![
+            "toolchain",
+            "install",
+            NIGHTLY_TOOLCHAIN,
+            "--component",
+            "llvm-tools-preview",
+            "rustc-dev",
+        ]);
+
+    let child = install_toolchain
+        // Capture the stdout to return from this function as bytes
+        .stdout(std::process::Stdio::piped())
+        .spawn()?;
+
+    let output = child.wait_with_output()?;
+
+    if !output.status.success() {
+        anyhow::bail!(
+            "`{:?}` failed with exit code: {:?}",
+            install_toolchain,
+            output.status.code()
+        );
+    }
+
     let mut cmd = Command::new("rustup");
 
     let manifest_arg = format!(
@@ -174,7 +202,7 @@ fn build_and_zip_dylint_driver(
     let target_dir = format!("--target-dir={}", out_dir.display());
     cmd.args(vec![
         "run",
-        "nightly-2022-06-30",
+        NIGHTLY_TOOLCHAIN,
         "cargo",
         "build",
         "--release",