Add a helper script to be able to run "apt-get install" without running

src/scripts/dpkg_no_scripts.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 can be used to replace the "dpkg" binary as far as the
+# "apt-get install" command is concerned. When "apt-get install foo"
+# runs it will make two calls to dpkg like:
+#   dpkg --status-fd ## --unpack --auto-deconfigure /path/to/foo.deb
+#   dpkg --status-fd ## --configure foo
+# This script will extract the .deb file and make it appear to be installed
+# successfully. It will skip the maintainer scripts and configure steps.
+#
+# As a one-off test, you can run like:
+#  apt-get -o="Dir::Bin::dpkg=/path/to/this" install foo
+
+# 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"
+
+# Flags
+DEFINE_string root "" \
+  "The target rootfs directory in which to install packages."
+DEFINE_string status_fd "" \
+  "The file descriptor to report status on; ignored."
+DEFINE_boolean unpack $FLAGS_FALSE "Is the action 'unpack'?"
+DEFINE_boolean configure $FLAGS_FALSE "Is the action 'configure'?"
+DEFINE_boolean auto_deconfigure $FLAGS_FALSE "Ignored"
+
+# Fix up the command line and parse with shflags.
+FIXED_FLAGS="$@"
+FIXED_FLAGS=${FIXED_FLAGS/status-fd/status_fd}
+FIXED_FLAGS=${FIXED_FLAGS/auto-deconfigure/auto_deconfigure}
+FLAGS $FIXED_FLAGS || exit 1
+eval set -- "${FLAGS_ARGV}"
+
+# Die on any errors.
+set -e
+
+if [ $FLAGS_configure -eq $FLAGS_TRUE ]; then
+  # We ignore configure requests.
+  exit 0
+fi
+if [ $FLAGS_unpack -ne $FLAGS_TRUE ]; then
+  # Ignore unknown command line.
+  echo "Unexpected command line: $@"
+  exit 0
+fi
+if [ -z "$FLAGS_root" ]; then
+  echo "Missing root directory."
+  exit 0
+fi
+
+DPKG_STATUS=""
+if [ -d "$FLAGS_root/var/lib/dpkg" ]; then
+  DPKG_STATUS="$FLAGS_root/var/lib/dpkg/status"
+  DPKG_INFO="$FLAGS_root/var/lib/dpkg/info/"
+fi
+
+for p in "$@"; do
+  echo "Extracting $p"
+  dpkg-deb --extract "$p" "$FLAGS_root"
+
+  if [ -n "$DPKG_STATUS" ]; then
+    TMPDIR=$(mktemp -d)
+    dpkg-deb --control "$p" "$TMPDIR"
+
+    # Copy the info files
+    PACKAGE=$(dpkg-deb --field "$p" Package)
+    FILES=$(ls "$TMPDIR" | grep -v control)
+    for f in $FILES; do
+      cp "${TMPDIR}/$f" "${DPKG_INFO}/$PACKAGE.$f"
+    done
+
+    # Mark the package as installed successfully.
+    echo "Status: install ok installed" >> "$DPKG_STATUS"
+    cat "${TMPDIR}/control" >> "$DPKG_STATUS"
+    echo "" >> "$DPKG_STATUS"
+
+    rm -rf "$TMPDIR"
+  fi
+done