add --no-op/-n arg

Signed-off-by: onur-ozkan <[email protected]>

Author: onur-ozkan

rustup-init.sh

@@ -58,6 +58,8 @@ Options:
           Don't update any existing default toolchain after install
       --no-modify-path
           Don't configure the PATH environment variable
+  -n, --no-op
+		Terminates the script immediately without any operation. This is useful when calling next to `source`
   -h, --help
           Print help
   -V, --version
@@ -110,6 +112,9 @@ main() {
     local need_tty=yes
     for arg in "$@"; do
         case "$arg" in
+            --no-op|-n)
+                exit 0
+                ;;
             --help)
                 usage
                 exit 0