Make mount points before attempting to mount on them

enter_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.
 
 # Script to enter the chroot environment
 
 # --- BEGIN COMMON.SH BOILERPLATE ---
 # Load common CrOS utilities.  Inside the chroot this file is installed in
@@ skipping 125 matching lines @@
 function ensure_mounted {
   # If necessary, mount $source in the host FS at $target inside the
   # chroot directory with $mount_args.
   local source="$1"
   local mount_args="$2"
   local target="$3"
 
   local mounted_path="$(readlink -f "${FLAGS_chroot}/$target")"
 
   if [ -z "$(mount | grep -F "on ${mounted_path} ")" ]; then
+    # Attempt to make the mountpoint as the user.  This depends on the
+    # fact that all mountpoints that should be owned by root are
+    # already present.
+    mkdir -p "${mounted_path}"
+
     # NB:  mount_args deliberately left unquoted
     debug mount ${mount_args} "${source}" "${mounted_path}"
     sudo -- mount ${mount_args} "${source}" "${mounted_path}" || \
       die "Could not mount ${source} on ${mounted_path}"
   fi
 }
 
 function setup_env {
   # Validate sudo timestamp before entering the critical section so that we
   # don't stall for a password while we have the lockfile.
@@ skipping 229 matching lines @@
 # Run command or interactive shell.  Also include the non-chrooted path to
 # the source trunk for scripts that may need to print it (e.g.
 # build_image.sh).
 sudo -- chroot "$FLAGS_chroot" sudo -i -u $USER $CHROOT_PASSTHRU \
   EXTERNAL_TRUNK_PATH="${FLAGS_trunk}" LANG=C SSH_AGENT_PID="${SSH_AGENT_PID}" \
   SSH_AUTH_SOCK="${SSH_AUTH_SOCK}" "$@"
 
 # Remove trap and explicitly unmount
 trap - EXIT
 teardown_env