Re: [Fedora-livecd-list] [PATCH] Don't truncate the overlay file on a reset.
On Wed, Aug 29, 2012 at 9:15 PM, Frederick Grose <fgrose(a)gmail.com> wrote:
commit d0d4f29cdd0a0e6dd1170965decb282ef5511746
Author: Frederick Grose <fgrose(a)sugarlabs.org>
Date: Wed Aug 29 21:02:07 2012 -0400
Don't truncate the overlay file on a reset.
diff --git a/modules.d/90dmsquash-live/dmsquash-live-root.sh
b/modules.d/90dmsquash-live/dmsquash-live-root.sh
index f8bfca6..62340a5 100755
--- a/modules.d/90dmsquash-live/dmsquash-live-root.sh
+++ b/modules.d/90dmsquash-live/dmsquash-live-root.sh
@@ -98,7 +98,7 @@ do_live_overlay() {
if [ -f /run/initramfs/overlayfs$pathspec -a -w
/run/initramfs/overlayfs$pathspec ]; then
losetup $OVERLAY_LOOPDEV /run/initramfs/overlayfs$pathspec
if [ -n "$reset_overlay" ]; then
- dd if=/dev/zero of=$OVERLAY_LOOPDEV bs=64k count=1 2>/dev/null
+ dd if=/dev/zero of=$OVERLAY_LOOPDEV bs=64k count=1
conv=notrunc 2>/dev/null
fi
setup="yes"
fi
Void the above patch.
I don't know why the overlay is NOT truncated without the notrunc
conversion argument to dd.
However, my testing shows that this bug is fixed by using the fsync
conversion argument,
https://bugzilla.redhat.com/show_bug.cgi?id=832884
A revised patch file is attached to the bug ticket.
--Fred