Use 1280x1024 resolution when running ChromeOS under qemu.

BUG=none
TEST=Run ChromeOS under qemu, the screen should be 1280x1024 not 800x600.

Review URL: http://codereview.chromium.org/6768009

Change-Id: I9a73025244a85d3b07e98136b373b00bb40cd9dd

fixup_image_for_qemu.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2011 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.
+
+"""Makes changes to mounted Chromium OS image to allow it to run with VMs
+
+This script changes two files within the Chromium OS image to let the image
+work with VMs, particularly QEMU
+
+Currently this script does the following,
+1.) Modify xorg.conf to advertize a screen which can do 1280x1024
+"""
+
+from optparse import OptionParser
+import os
+import stat
+import sys
+
+USAGE = "usage: %prog --mounted_dir=directory"
+
+REPLACE_SCREEN_PAIR = ('Identifier "DefaultMonitor"',
+  'Identifier "DefaultMonitor"\n    HorizSync 28-51\n    VertRefresh 43-60')
+XORG_CONF_FILENAME = os.path.join('etc', 'X11', 'xorg.conf')
+
+
+# Modify the xorg.conf file to change all screen sections
+def FixXorgConf(mount_point):
+  xorg_conf_filename = os.path.join(mount_point, XORG_CONF_FILENAME)
+  f = open(xorg_conf_filename, 'r')
+  xorg_conf = f.read()
+  f.close()
+
+  # Add refresh rates for the screen
+  xorg_conf = xorg_conf.replace(REPLACE_SCREEN_PAIR[0],
+                                REPLACE_SCREEN_PAIR[1])
+
+  # Write the file back out.
+  f = open(xorg_conf_filename, 'w')
+  f.write(xorg_conf)
+  f.close()
+
+def main():
+  parser = OptionParser(USAGE)
+  parser.add_option('--mounted_dir', dest='mounted_dir',
+                    help='directory where the Chromium OS image is mounted')
+  (options, args) = parser.parse_args()
+
+  if not options.mounted_dir:
+    parser.error("Please specify the mount point for the Chromium OS image");
+
+  FixXorgConf(options.mounted_dir)
+
+
+if __name__ == '__main__':
+  main()

image_to_vm.sh

@@ -189,6 +189,9 @@ sudo mount -o loop "${TEMP_ROOTFS}" "${TEMP_MNT}"
 mkdir -p "${TEMP_ESP_MNT}"
 sudo mount -o loop "${TEMP_ESP}" "${TEMP_ESP_MNT}"
 
+sudo python "${SCRIPTS_DIR}/fixup_image_for_qemu.py" \
+    --mounted_dir="${TEMP_MNT}"
+
 # Modify the unverified usb template which uses a default usb_disk of sdb3
 sudo sed -i -e 's/sdb3/sda3/g' "${TEMP_MNT}/boot/syslinux/usb.A.cfg"