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crosutils: Improve dd in image_to_usb.sh

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1. add oflags=sync to allow interrupting dd without hanging system I/O for a long time
   (since bs=4M, the speed is almost the same)
2. use pv to provide progress report if available.
   (add pv into host-depends in http://codereview.chromium.org/3608004)

BUG=none
TEST=manually:
1. install pv in chroot, then execute image_to_usb.sh --to /dev/sdX and verified there's progress bar
2. ctrl-c to break the dd process and verified it can stop immediately
3. remove pv from chroot, then execute image_to_usb.sh and verify that it still works

Change-Id: I62fc373a4feee6d7e61897325d9e1e6d84a74d63

Review URL: http://codereview.chromium.org/3581007
This commit is contained in:
Hung-Te Lin 2010-10-04 11:01:11 +08:00
parent 3ede50ed4e
commit 4732d5d0c3
1 changed files with 5 additions and 1 deletions
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6
image_to_usb.sh
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@ -236,7 +236,11 @@ then
if [ ${FLAGS_install} -ne ${FLAGS_TRUE} ]; then
echo "Copying ${SRC_IMAGE} to ${FLAGS_to}..."
sudo dd if="${SRC_IMAGE}" of="${FLAGS_to}" bs=4M
if type pv >/dev/null 2>&1; then
sudo pv -ptre "${SRC_IMAGE}" | sudo dd of="${FLAGS_to}" bs=4M oflag=sync
else
sudo dd if="${SRC_IMAGE}" of="${FLAGS_to}" bs=4M oflag=sync
fi
sync
else
if [ ${INSIDE_CHROOT} -ne 1 ]; then