[cargo-zerocopy] Auto-install env var toggle

joshlf · joshlf · commit 522b0916cfc9 · 2025-12-02T13:41:12.000Z
When the environment variable `CARGO_ZEROCOPY_AUTO_INSTALL_TOOLCHAIN` is
set, auto-install toolchains without prompting the user.

gherrit-pr-id: Ic5070e48a9b829ca68b8356d44b42bd97543ead9
diff --git a/tools/cargo-zerocopy/src/main.rs b/tools/cargo-zerocopy/src/main.rs
@@ -142,6 +142,8 @@ fn install_toolchain_or_exit(versions: &Versions, name: &str) -> Result<(), Erro
     eprintln!("[cargo-zerocopy] missing either toolchain '{name}' or component 'rust-src'");
     if env::vars().any(|v| v.0 == "GITHUB_RUN_ID") {
         eprint!("[cargo-zerocopy] detected GitHub Actions environment; auto-installing without waiting for confirmation");
+    } else if env::vars().any(|v| v.0 == "CARGO_ZEROCOPY_AUTO_INSTALL_TOOLCHAIN") {
+        eprint!("[cargo-zerocopy] detected CARGO_ZEROCOPY_AUTO_INSTALL_TOOLCHAIN environment variable; auto-installing without waiting for confirmation");
     } else {
         loop {
             eprint!("[cargo-zerocopy] would you like to install toolchain '{name}' and component 'rust-src' via 'rustup' (y/n)? ");
