build: Make make_chroot and make_local_repo fail when run as root.

src/scripts/make_chroot.sh

 #!/bin/bash
 
 # Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This script sets up an Ubuntu chroot environment. The ideas come
 # from https://wiki.ubuntu.com/DebootstrapChroot and conversations with
 # tedbo. The script is passed the path to an empty folder, which will be
 # populated with the files to form an Ubuntu Jaunty system with the packages
 # listed in PACKAGE_LIST_FILE (below) and their dependencies. Once created,
 # the password is set to PASSWORD (below). One can enter the chrooted
 # environment for work by running
 # enter_chroot_dev_environment.sh /path/to/chroot-root
 
 # Load common constants.  This should be the first executable line.
 # The path to common.sh should be relative to your script's location.
 . "$(dirname "$0")/common.sh"
 
-# Script must be run outside the chroot
+# Script must be run outside the chroot and as a regular user.
 assert_outside_chroot
+assert_not_root_user
 
 DEFAULT_PKGLIST="$SRC_ROOT/package_repo/package-list-dev.txt"
 
 # Define command line flags
 # See http://code.google.com/p/shflags/wiki/Documentation10x
 DEFINE_string suite "$DEFAULT_DEV_SUITE" "Repository suite to base image on."
 DEFINE_string mirror "$DEFAULT_DEV_MIRROR" "Local repository mirror to use."
 DEFINE_string chroot "$DEFAULT_CHROOT_DIR" \
   "Destination dir for the chroot environment."
 DEFINE_string pkglist "$DEFAULT_PKGLIST" \
@@ skipping 160 matching lines @@
   CHROOT_EXAMPLE_OPT="--chroot=$FLAGS_chroot"
 fi
 
 echo "All set up.  To enter the chroot, run:"
 echo "    $SCRIPTS_DIR/enter_chroot.sh $CHROOT_EXAMPLE_OPT"
 echo ""
 echo "CAUTION: Do *NOT* rm -rf the chroot directory; if there are stale bind"
 echo "mounts you may end up deleting your source tree too.  To unmount and"
 echo "delete the chroot cleanly, use:"
 echo "    $0 --delete $CHROOT_EXAMPLE_OPT"