Add function to change permission on a chroot.

test/alpine.sh

@@ -36,6 +36,12 @@ _extract() {
extract() { sudo $0 _extract "$@"; }
extract-distro-build() { sudo $0 _extract $DISTRO_BUILD_CHROOT_DIR; }

# Without this, you can't 'su myusername'.  It won't be able to execute bash.
chmod-chroot() {
  local dest=${1:-$CHROOT_DIR}
  sudo chmod 755 $dest
}

# add DNS -- for package manager

_setup-dns() {