Add flags to disable rust and cargo (fix #200)

src/config.rs

@@ -24,6 +24,8 @@ lazy_static! {
         m.insert("gem", Step::Gem);
         m.insert("sdkman", Step::Sdkman);
         m.insert("remotes", Step::Remotes);
+        m.insert("rustup", Step::Rustup);
+        m.insert("cargo", Step::Cargo);
 
         #[cfg(windows)]
         m.insert("powershell", Step::Powershell);
@@ -49,6 +51,10 @@ pub enum Step {
     Sdkman,
     /// Don't run remote Togprades
     Remotes,
+    /// Don't run Rustup
+    Rustup,
+    /// Don't run Cargo
+    Cargo,
     /// Don't update Powershell modules
     Powershell,
 }

src/main.rs

@@ -278,18 +278,23 @@ fn run() -> Result<(), Error> {
         )?;
     }
 
+    if config.should_run(Step::Rustup) {
         execute(
             &mut report,
             "rustup",
             || generic::run_rustup(&base_dirs, run_type),
             config.no_retry(),
         )?;
+    }
+
+    if config.should_run(Step::Cargo) {
         execute(
             &mut report,
             "cargo",
             || generic::run_cargo_update(run_type),
             config.no_retry(),
         )?;
+    }
 
     if config.should_run(Step::Emacs) {
         execute(&mut report, "Emacs", || emacs.upgrade(run_type), config.no_retry())?;