Do not warn about missing change ID in tarball builds

Author: Kobzol

src/bootstrap/src/bin/main.rs

@@ -199,12 +199,16 @@ fn check_version(config: &Config) -> Option<String> {
         Some(ChangeId::Ignore) => return None,
         Some(ChangeId::Id(id)) => id,
         None => {
-            msg.push_str("WARNING: The `change-id` is missing in the `bootstrap.toml`. This means that you will not be able to track the major changes made to the bootstrap configurations.\n");
-            msg.push_str("NOTE: to silence this warning, ");
-            msg.push_str(&format!(
-                "add `change-id = {latest_change_id}` or `change-id = \"ignore\"` at the top of `bootstrap.toml`"
-            ));
-            return Some(msg);
+            return if !config.rust_info.is_from_tarball() {
+                msg.push_str("WARNING: The `change-id` is missing in the `bootstrap.toml`. This means that you will not be able to track the major changes made to the bootstrap configurations.\n");
+                msg.push_str("NOTE: to silence this warning, ");
+                msg.push_str(&format!(
+                    "add `change-id = {latest_change_id}` or `change-id = \"ignore\"` at the top of `bootstrap.toml`"
+                ));
+                Some(msg)
+            } else {
+                None
+            };
         }
     };