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Resize image without using a loop device to avoid sync.

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To resize an image, there's no need to use a loop device. We can just operate
on the image directly. This is simpler and avoids doing a sync which can
noticeably delay the build.

BUG=chromium-os:19150
TEST=Run image_to_vm.sh --board=x86-mario

Change-Id: Idbfc99cee9fd890aaad6379fbde511b273cc1d41
Reviewed-on: http://gerrit.chromium.org/gerrit/6036
Reviewed-by: Anush Elangovan <anush@chromium.org>
Reviewed-by: Chris Sosa <sosa@chromium.org>
Tested-by: David James <davidjames@chromium.org>
This commit is contained in:
David James 2011-08-15 17:11:00 -07:00
parent 63f62623d4
commit 596520acd9
1 changed files with 2 additions and 11 deletions
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13
image_to_vm.sh
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@ -157,17 +157,8 @@ else
echo "Resizing stateful partition to ${FLAGS_statefulfs_size}MB"
# Extend the original file size to the new size.
dd if=/dev/zero of="${TEMP_STATE}" bs=1 count=1 \
seek=$((STATEFUL_SIZE_BYTES - 1))
# Resize the partition.
STATEFUL_LOOP_DEV=$(sudo losetup --show -f "${TEMP_STATE}")
if [ -z "${STATEFUL_LOOP_DEV}" ]; then
die "No free loop device. Free up a loop device or reboot. Exiting."
fi
sudo e2fsck -pf "${STATEFUL_LOOP_DEV}"
sudo resize2fs "${STATEFUL_LOOP_DEV}"
sudo sync
sudo losetup -d "${STATEFUL_LOOP_DEV}"
sudo e2fsck -pf "${TEMP_STATE}"
sudo resize2fs "${TEMP_STATE}" ${FLAGS_statefulfs_size}M
fi
fi
TEMP_PMBR="${TEMP_DIR}"/pmbr