From da88c56b9f7c7ae54cfb1736ba64245d7179a894 Mon Sep 17 00:00:00 2001
From: Johannes 'josch' Schauer <josch@mister-muffin.de>
Date: Sat, 2 May 2020 23:54:04 +0200
Subject: [PATCH] warn if chrootless mode is run by the root user

---
 mmdebstrap | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mmdebstrap b/mmdebstrap
index 290aafb..6ace61a 100755
--- a/mmdebstrap
+++ b/mmdebstrap
@@ -3171,7 +3171,10 @@ sub main() {
             exit 1;
         }
     } elsif ($options->{mode} eq 'chrootless') {
-        # nothing to do
+        if ($EFFECTIVE_USER_ID == 0) {
+            warning "running chrootless mode as root might damage the host "
+              . "system";
+        }
     } else {
         error "unknown mode: $options->{mode}";
     }