Switch to GPT partition format.

src/scripts/build_image.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 build a bootable keyfob-based chromeos system image.
 # It uses debootstrap (see https://wiki.ubuntu.com/DebootstrapChroot) to
 # create a base file system. It then cusotmizes the file system and adds
 # Ubuntu and chromeos specific packages. Finally, it creates a bootable USB
@@ skipping 46 matching lines @@
 # Determine build version
 . "${SCRIPTS_DIR}/chromeos_version.sh"
 
 # Use canonical path since some tools (e.g. mount) do not like symlinks
 # Append build attempt to output directory
 IMAGE_SUBDIR="${CHROMEOS_VERSION_STRING}-a${FLAGS_build_attempt}"
 OUTPUT_DIR="${FLAGS_output_root}/${IMAGE_SUBDIR}"
 ROOT_FS_DIR="${OUTPUT_DIR}/rootfs"
 ROOT_FS_IMG="${OUTPUT_DIR}/rootfs.image"
 MBR_IMG="${OUTPUT_DIR}/mbr.image"
-OUTPUT_IMG="${OUTPUT_DIR}/usb.img"
 
 # These paths are relative to SCRIPTS_DIR.
 ROOTFS_PACKAGE_INSTALL_SCRIPT="install_packages.sh"
 ROOTFS_CUSTOMIZE_SCRIPT="customize_rootfs.sh"
 
 ROOTFS_STATIC_DATA="${SRC_ROOT}/rootfs_static_data"
 ROOTFS_SETUP_DIR="/tmp/chromeos_setup"
 SETUP_DIR="${ROOT_FS_DIR}/${ROOTFS_SETUP_DIR}"
 
 LOOP_DEV=
@@ skipping 175 matching lines @@
   menu label chromeos-hd
   kernel vmlinuz
   append quiet console=tty2 init=/sbin/init boot=local rootwait root=HDROOT ro noresume noswap i915.modeset=1 loglevel=1
 EOF
 
 # Make partition bootable and label it.
 sudo "$SCRIPTS_DIR/extlinux.sh" -z --install "${ROOT_FS_DIR}/boot"
 
 cleanup_rootfs_loop
 
-# Create a master boot record.
-# Start with the syslinux master boot record. We need to zero-pad to
-# fill out a 512-byte sector size.
-SYSLINUX_MBR="/usr/lib/syslinux/mbr.bin"
-dd if="$SYSLINUX_MBR" of="$MBR_IMG" bs=512 count=1 conv=sync
-# Create a partition table in the MBR.
-NUM_SECTORS=$((`stat --format="%s" "$ROOT_FS_IMG"` / 512))
-sudo sfdisk -H64 -S32 -uS -f "$MBR_IMG" <<EOF
-,$NUM_SECTORS,L,-,
-,$NUM_SECTORS,S,-,
-,$NUM_SECTORS,L,*,
-;
-EOF
+# Create a GPT-booting master boot record for use by extlinux boot. In order to
+# make a nicer mbr we zero-pad to fill out a 512-byte sector size.
+SYSLINUX_BUILD_ROOT="${FLAGS_build_root}/x86/obj/src/third_party/syslinux/"
+cat "$SYSLINUX_BUILD_ROOT"/syslinux-*/mbr/gptmbr.bin | \
+  dd of="$MBR_IMG" bs=512 count=1 conv=sync
+
+# Copy utilities needed to create a bootable image to the output directory.

[adlr, 2009/12/17 08:17:52]

would it be easier (or more future proof?) to just copy the whole scripts
directory?

+cp "${SCRIPTS_DIR}/common.sh" "${OUTPUT_DIR}"
+cp "${SCRIPTS_DIR}/image_to_usb.sh" "${OUTPUT_DIR}/make_bootable_image.sh"
+cp "${SRC_ROOT}/platform/installer/chromeos_install_functions.sh" \
+  "${OUTPUT_DIR}"
+cp "${SRC_ROOT}/third_party/shflags/files/src/shflags" "${OUTPUT_DIR}"
+if [ ! -x "${SRC_ROOT}/third_party/gpt/gpt-host" ]; then
+  # We'll have to build the host version of the gpt utility.
+  cd "${SRC_ROOT}/third_party/gpt"
+  make gpt-host
+  cd -
+fi
+cp "${SRC_ROOT}/third_party/gpt/gpt-host" "${OUTPUT_DIR}/gpt"
 
 OUTSIDE_OUTPUT_DIR="${EXTERNAL_TRUNK_PATH}/src/build/images/${IMAGE_SUBDIR}"
 echo "Done.  Image created in ${OUTPUT_DIR}"
 echo "To copy to USB keyfob, outside the chroot, do something like:"
 echo "  ./image_to_usb.sh --from=${OUTSIDE_OUTPUT_DIR} --to=/dev/sdb"
 echo "To convert to VMWare image, outside the chroot, do something like:"
 echo "  ./image_to_vmware.sh --from=${OUTSIDE_OUTPUT_DIR}"
 
 trap - EXIT