Rust: Set RUSTUP_AUTO_INSTALL=1

Author: hvitved

rust/extractor/src/config.rs

@@ -151,6 +151,11 @@ impl Config {
 
     pub fn to_cargo_config(&self, dir: &AbsPath) -> (CargoConfig, LoadCargoConfig) {
         let sysroot = self.sysroot(dir);
+        let mut extra_env = FxHashMap::default();
+        // RUSTUP_AUTO_INSTALL is set to 0 by rust-analyzer (https://github.com/rust-lang/rust-analyzer/issues/20719),
+        // but we do want to allow rustup to auto-install toolchains if needed, so we set it to 1 here.
+        extra_env.insert("RUSTUP_AUTO_INSTALL".to_owned(), Some("1".to_owned()));
+        extra_env.extend(self.cargo_extra_env.clone());
         (
             CargoConfig {
                 all_targets: self.cargo_all_targets,
@@ -166,7 +171,7 @@ impl Config {
                     .map(ToOwned::to_owned)
                     .map(RustLibSource::Path),
 
-                extra_env: self.cargo_extra_env.clone(),
+                extra_env,
                 extra_args: self.cargo_extra_args.clone(),
                 extra_includes: self
                     .extra_includes