core: tools: scripts: red-pill: Add option to select user

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

core/tools/scripts/red-pill

@@ -1,5 +1,44 @@
+#!/bin/bash
+
+usage() {
+  echo "Usage: $0 [-h] [-u user]"
+  echo
+  echo "  -h,        Show this help message"
+  echo "  -u,        Define a user (default: pi)"
+  exit 1
+}
+
+# Default values
+user="pi"
+
+while getopts ":hu:" opt; do
+  case ${opt} in
+    h )
+      usage
+      ;;
+    u )
+      user=$OPTARG
+      ;;
+    \? )
+      echo "Invalid Option: -$OPTARG" 1>&2
+      usage
+      ;;
+    : )
+      echo "Invalid Option: -$OPTARG requires an argument" 1>&2
+      usage
+      ;;
+  esac
+done
+shift $((OPTIND -1))
+
+# Don't simply ignore additional arguments
+if [ $# -gt 0 ]; then
+  echo "Invalid Argument: $1" 1>&2
+  usage
+fi
+
 echo "You took the red pill."
 echo "You stay in Wonderland, and I show you how deep the rabbit hole goes."
 echo "Remember, all I'm offering is the truth. Nothing more."
 echo "Exiting from docker, welcome to the real world."
-ssh -i /root/.config/.ssh/id_rsa -o StrictHostKeyChecking=no pi@localhost
+ssh -i /root/.config/.ssh/id_rsa -o StrictHostKeyChecking=no $user@localhost