1 files changed, 24 insertions, 0 deletions
diff --git a/src/bootstrap/bin/_helper.rs b/src/bootstrap/bin/_helper.rs
new file mode 100644
index 000000000..09aa471db
--- /dev/null
+++ b/src/bootstrap/bin/_helper.rs
@@ -0,0 +1,24 @@
+/// Parses the value of the "RUSTC_VERBOSE" environment variable and returns it as a `usize`.
+/// If it was not defined, returns 0 by default.
+///
+/// Panics if "RUSTC_VERBOSE" is defined with the value that is not an unsigned integer.
+fn parse_rustc_verbose() -> usize {
+    use std::str::FromStr;
+
+    match std::env::var("RUSTC_VERBOSE") {
+        Ok(s) => usize::from_str(&s).expect("RUSTC_VERBOSE should be an integer"),
+        Err(_) => 0,
+    }
+}
+
+/// Parses the value of the "RUSTC_STAGE" environment variable and returns it as a `String`.
+///
+/// If "RUSTC_STAGE" was not set, the program will be terminated with 101.
+fn parse_rustc_stage() -> String {
+    std::env::var("RUSTC_STAGE").unwrap_or_else(|_| {
+        // Don't panic here; it's reasonable to try and run these shims directly. Give a helpful error instead.
+        eprintln!("rustc shim: fatal: RUSTC_STAGE was not set");
+        eprintln!("rustc shim: note: use `x.py build -vvv` to see all environment variables set by bootstrap");
+        exit(101);
+    })
+}