check $ID rather than writable root

diff --git a/.bin/custom-chroot b/.bin/custom-chroot
index 42b0c5a6c25e59a506545f0f6437181a08727788..c6e3164041b9c75eb84c6506c8f06b87bf95e103 100755 (executable)
--- a/.bin/custom-chroot
+++ b/.bin/custom-chroot
@@ -1,7 +1,7 @@
 #!/bin/bash -e
 
 bootstrap() {
-       [[ -w / ]] || exec sudo env -uUNSHARE HOME="$HOME" "$0" "$@"
+       [[ $(id -u) -eq 0 ]] || exec sudo env -uUNSHARE HOME="$HOME" "$0" "$@"
 
        if [[ -z ${UNSHARE} ]] ; then
                mount_args=