Reduce the size of factory install shim.

src/scripts/build_image

 #!/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 from within
 # a chromiumos setup. This assumes that all needed packages have been built into
 # the given target's root with binary packages turned on. This script will
 # build the Chrome OS image using only pre-built binary packages.
@@ skipping 21 matching lines @@
 DEFINE_boolean withdev $FLAGS_TRUE \
   "Include useful developer friendly utilities in the image."
 DEFINE_boolean installmask $FLAGS_TRUE \
   "Use INSTALL_MASK to shrink the resulting image."
 DEFINE_integer jobs -1 \
   "How many packages to build in parallel at maximum."
 DEFINE_boolean statefuldev $FLAGS_TRUE \
   "Install development packages on stateful partition rather than the rootfs"
 DEFINE_string to "" \
   "The target image file or device"
+DEFINE_boolean factory_install $FLAGS_FALSE \
+  "Build a smaller image to overlay the factory install shim on; this argument \
+is also required in image_to_usb."
 DEFINE_string arm_extra_bootargs "" \
   "Additional command line options to pass to the ARM kernel."
 
 # Parse command line.
 FLAGS "$@" || exit 1
 eval set -- "${FLAGS_ARGV}"
 
 # Only now can we die on error.  shflags functions leak non-zero error codes,
 # so will die prematurely if 'set -e' is specified before now.
 set -e
@@ skipping 121 matching lines @@
 
 # Check for loop device before creating image.
 LOOP_DEV=$(sudo losetup -f)
 if [ -z "$LOOP_DEV" ] ; then
   echo "No free loop device.  Free up a loop device or reboot.  exiting. "
   exit 1
 fi
 
 # Create root file system disk image to fit on a 1GB memory stick.
 # 1 GB in hard-drive-manufacturer-speak is 10^9, not 2^30.  950MB < 10^9 bytes.
-ROOT_SIZE_BYTES=$((1024 * 1024 * 720))
+if [[ $FLAGS_factory_install -eq ${FLAGS_TRUE} ]] ; then
+  ROOT_SIZE_BYTES=$((1024 * 1024 * 180))
+else
+  ROOT_SIZE_BYTES=$((1024 * 1024 * 720))
+fi
+
 dd if=/dev/zero of="$ROOT_FS_IMG" bs=1 count=1 seek=$((ROOT_SIZE_BYTES - 1))
 sudo losetup "$LOOP_DEV" "$ROOT_FS_IMG"
 sudo mkfs.ext3 "$LOOP_DEV"
 
 # Tune and mount rootfs.
 UUID=$(uuidgen)
 DISK_LABEL="C-KEYFOB"
 sudo tune2fs -L "$DISK_LABEL" -U "$UUID" -c 0 -i 0 "$LOOP_DEV"
 sudo mount "$LOOP_DEV" "$ROOT_FS_DIR"
 
@@ skipping 58 matching lines @@
 # We need to install libstdc++ manually from the cross toolchain.
 # TODO: Figure out a better way of doing this?
 sudo cp -a "${BOARD_ROOT}"/lib/libgcc_s.so* "${ROOT_FS_DIR}/lib"
 sudo cp -a "${BOARD_ROOT}"/usr/lib/libstdc++.so* "${ROOT_FS_DIR}/usr/lib"
 
 INSTALL_MASK=""
 if [[ $FLAGS_installmask -eq ${FLAGS_TRUE} ]] ; then
   INSTALL_MASK="$DEFAULT_INSTALL_MASK"
 fi
 
+# Reduce the size of factory install shim.
+# TODO: Build a separated ebuild for the factory install shim to reduce size.
+if [[ $FLAGS_factory_install -eq ${FLAGS_TRUE} ]] ; then
+  INSTALL_MASK="$INSTALL_MASK $FACTORY_INSTALL_MASK"
+fi
+
 if [[ $FLAGS_jobs -ne -1 ]]; then
   EMERGE_JOBS="--jobs=$FLAGS_jobs"
 fi
 
 # Prepare stateful partition with some pre-created directories
 sudo mkdir -p "${DEV_IMAGE_ROOT}"
 sudo mkdir -p "${STATEFUL_DIR}/var"
 
 # Create symlinks so that /usr/local/usr based directories are symlinked to
 # /usr/local/ directories e.g. /usr/local/usr/bin -> /usr/local/bin, etc.
@@ skipping 70 matching lines @@
 }
 
 menuentry "local image B" {
   linux $grubpartB/boot/vmlinuz quiet console=tty2 init=/sbin/init boot=local rootwait root=/dev/$linuxpartB ro noresume noswap i915.modeset=1 loglevel=1
 }
 
 EOF
 
 # By default, dev mode should be activated for either development builds or
 # test builds.
-if [[ $FLAGS_withdev -eq $FLAGS_TRUE ]] ||\
-    [[ $FLAGS_withtest -eq $FLAGS_TRUE ]]; then
+if [[ $FLAGS_withdev -eq $FLAGS_TRUE ]] ; then
   sudo touch "$ROOT_FS_DIR/root/.dev_mode"
 
   # Re-run ldconfig to fix /etc/ldconfig.so.cache.
   sudo /sbin/ldconfig -r "$ROOT_FS_DIR"
 fi
 
 # Perform any customizations on the root file system that are needed.
 "${SCRIPTS_DIR}/customize_rootfs" \
   --root="$ROOT_FS_DIR" \
   --target="$ARCH" \
   --board="$BOARD"
 
-# Check that the image has been correctly created.
-"${SCRIPTS_DIR}/test_image" \
-  --root="$ROOT_FS_DIR" \
-  --target="$ARCH"
+# Don't test the factory install shim.
+if [[ $FLAGS_factory_install -eq ${FLAGS_FALSE} ]] ; then
+  # Check that the image has been correctly created.
+  "${SCRIPTS_DIR}/test_image" \
+    --root="$ROOT_FS_DIR" \
+    --target="$ARCH"
+fi
 
 # Clean up symlinks so they work on a running target rooted at "/".
 # Here development packages are rooted at /usr/local.  However, do not
 # create /usr/local or /var on host (already exist on target).
 setup_symlinks_on_root "/usr/local" "/var" "${STATEFUL_DIR}"
 
 # Cleanup loop devices.
 cleanup
 
 trap delete_prompt EXIT
@@ skipping 13 matching lines @@
 
 OUTSIDE_OUTPUT_DIR="../build/images/${FLAGS_board}/${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/sdX"
 echo "To convert to VMWare image, OUTSIDE the chroot, do something like:"
 echo "  ./image_to_vmware.sh --from=${OUTSIDE_OUTPUT_DIR}"
 echo "from the scripts directory where you entered the chroot."
 
 trap - EXIT