Native build import script

Add a script to import all binary packages for a given source package
from ports.ubuntu.com, convert and install them using 'chromiumos-build
--convert', and write out a fake .changes file so that chromiumos-build
doesn't try to re-import them.  Use it like this:

  ./import_native_build.sh anthy libchewing

For the moment, there are a number of source packages that won't
cross-build successfully but that can be imported from native Ubuntu
builds, and this wraps up the process of doing so.

Review URL: http://codereview.chromium.org/543059

import_native_build.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+# Copyright (c) 2010 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.
+
+# Load common constants.  This should be the first executable line.
+# The path to common.sh should be relative to your script's location.
+. "$(dirname "$0")/common.sh"
+
+assert_inside_chroot
+assert_not_root_user
+
+# Flags
+DEFINE_string architecture armel "The architecture to fetch." a
+
+# Parse command line
+FLAGS "$@" || exit 1
+eval set -- "${FLAGS_ARGV}"
+
+# Die on error
+set -e
+
+cd "${DEFAULT_BUILD_ROOT}/${FLAGS_architecture}/local_packages"
+
+DEB_BUILD_ARCH="$(dpkg-architecture -qDEB_BUILD_ARCH)"
+
+DEBS=
+for SRC; do
+  SRCCACHE="$(apt-cache showsrc "$SRC")"
+  BINS="$(echo "$SRCCACHE" | grep -m1 ^Binary: | cut -d' ' -f2- | sed 's/,//g')"
+  VER="$(echo "$SRCCACHE" | grep -m1 ^Version: | cut -d' ' -f2)"
+  for BIN in $BINS; do
+    BINCACHE="$(apt-cache show "$BIN")" || continue # might be a udeb
+    DEB="$(echo "$BINCACHE" | grep -m1 ^Filename: | cut -d' ' -f2 | sed "s/_${DEB_BUILD_ARCH}\.deb/_${FLAGS_architecture}.deb/")"
+    wget -N "http://ports.ubuntu.com/ubuntu-ports/${DEB}"
+    DEBS="$DEBS ${DEB##*/}"
+  done
+  cat >"${SRC}_${VER#*:}_${FLAGS_architecture}.changes" <<EOF
+Version: $VER
+Fake: yes
+EOF
+done
+
+if [ "$DEBS" ]; then
+  chromiumos-build --convert -a "${FLAGS_architecture}" $DEBS
+fi