Issue 6821: script to verify rootfs integrity against value stored in kernel

Issue 6821: script to verify rootfs integrity against value stored in kernel

Change-Id: I09b851e5b9e971c281305802f287fe93e9309fe8

BUG=chromium-os:6821
TEST=manually ran script inside chroot for both a USB device and a dev build
of Chrome OS image. USB image has corrupted rootfs and dev build does not. The
script was able to detect both scenarios correctly.

[Tan Gao, 2010-09-17 20:05:17]

Hi Andrew/Will,

This CL provides a stand-alone script for developers and QA to be able to verify
the integrity of their GPT-based image. It certainly came handy during my
debugging!

PTAL thx!
Tan

[adlr, 2010-09-17 23:27:26]

http://codereview.chromium.org/3452013/diff/2001/3001
File verify_rootfs_chksum.sh (right):

http://codereview.chromium.org/3452013/diff/2001/3001#newcode19
verify_rootfs_chksum.sh:19: DEFINE_string from "" "Device or an image path.
Default: (empty)."
call this image rather than from?

http://codereview.chromium.org/3452013/diff/2001/3001#newcode41
verify_rootfs_chksum.sh:41: KERNEL_IMG="${FLAGS_from}2"
KERNEL_IMG=$(make_partition_dev "${FLAGS_from}" 2)

http://codereview.chromium.org/3452013/diff/2001/3001#newcode53
verify_rootfs_chksum.sh:53: dd if="${FLAGS_from}" of=${KERNEL_IMG} bs=512
skip=${kernel_offset} \
as long as you require sudo anyway, it might be nicer to use a loopback device
rather than take up a gig of temp space.

http://codereview.chromium.org/3452013/diff/2001/3001#newcode87
verify_rootfs_chksum.sh:87: ${TMP_FILE})
if you never read TMP_FILE, can you just use /dev/null?

[Tan Gao, 2010-09-20 22:55:10]

http://codereview.chromium.org/3452013/diff/2001/3001
File verify_rootfs_chksum.sh (right):

http://codereview.chromium.org/3452013/diff/2001/3001#newcode19
verify_rootfs_chksum.sh:19: DEFINE_string from "" "Device or an image path.
Default: (empty)."
On 2010/09/17 23:27:27, adlr wrote:
> call this image rather than from?

Done.

http://codereview.chromium.org/3452013/diff/2001/3001#newcode41
verify_rootfs_chksum.sh:41: KERNEL_IMG="${FLAGS_from}2"
On 2010/09/17 23:27:27, adlr wrote:
> KERNEL_IMG=$(make_partition_dev "${FLAGS_from}" 2)
> 

Done.

http://codereview.chromium.org/3452013/diff/2001/3001#newcode53
verify_rootfs_chksum.sh:53: dd if="${FLAGS_from}" of=${KERNEL_IMG} bs=512
skip=${kernel_offset} \
added TODO for myself

http://codereview.chromium.org/3452013/diff/2001/3001#newcode87
verify_rootfs_chksum.sh:87: ${TMP_FILE})
good catch. removed and replace w/ /dev/null

[adlr, 2010-09-21 00:56:33]

LGTM