tree 95bd2cc6a41d00f981160d5719fc418dc3fa19f6
parent b007e815b947c2ecf923e2a70b8437fd8a79682a
author Hung-Te Lin <hungte@chromium.org> 1314641862 +0800
committer Hung-Te Lin <hungte@chromium.org> 1315375243 -0700

crosutils/make_universal_factory_shim: allow images in arbitrary layout (for factory branch)

We need more flexible image creation tool for various layout, like "RMA with
multiple release images" which needs 4 images (install, test, release A,
release B).

To make the creation of image more flexible, this CL changes
make_universal_factory_shim to using a "layout file" that can describe any disk
image format we want.

Image creation speed is also improved by aligning partition offsets and
restricting oflag=dsync applied only when being used for block devices so that
make_universal_factory_shim (outputs to a normal temporary file) becomes faster
by utilizing system cache.

For a system with every images already cached:
 - Time for building 3 in 1 factory instal shim:
   Before = 8 seconds, After = 5 seconds.
 - Time for full RMA shim creation:
   Before = 1m25s, After = 40-50 seconds.

BUG=chrome-os-partner:4108
TEST=./make_universal_factory_shim.sh image1 image2 image3 image4
     # boots correctly after being imaged to SD card.
     ./make_factory_package.sh --usbimg RMA ....
     # RMA image can install images and works correctly

Original Reviewed-on: http://gerrit.chromium.org/gerrit/6893
Original Tested-by: Hung-Te Lin <hungte@chromium.org>
Original Reviewed-by: Nick Sanders <nsanders@chromium.org>

Change-Id: I2bf8519d8fc48252aa3df8e3ffacb9feede69f51
Reviewed-on: http://gerrit.chromium.org/gerrit/7320
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: Hung-Te Lin <hungte@chromium.org>