LVM errors with sbuild

Here is a strange one that I fixed but I’m not sure why. Roughly using the SBuildLVM Howto, and the Chef sbuild cookbook, I have an sbuild server. It was working alright for me, but another user was seeing this:

schroot -c lucid
E: 05lvm: File descriptor 3 (socket:[460392]) leaked on lvcreate invocation.
E: lucid-40c0e109-2d5d-4103-bf92-a44288595dcc: Chroot setup failed: stage=setup-start

When he ran with verbose mode, this line was particularly interesting:

E: 05lvm:

When I su’d to his user, it worked fine for me without verbose but failed similarly with the verbose flag.

In the course of debugging, I started trying to redirect output and I found that these changes to /etc/schroot/setup.d/05lvm fixed the problem. Unfortunately I’m running behind on work so I can’t track down the root cause right now.

--- 05lvm.orig	2011-03-10 19:28:17.000000000 +0000
+++ 05lvm	2011-03-10 19:37:54.000000000 +0000
@@ -36,10 +36,10 @@
 	if [ "$AUTH_VERBOSITY" = "verbose" ]; then
 	    lvcreate $VERBOSE --snapshot --name "$CHROOT_LVM_SNAPSHOT_NAME" \
 	    lvcreate $VERBOSE --snapshot --name "$CHROOT_LVM_SNAPSHOT_NAME" \
     elif [ $1 = "setup-stop" ]; then
@@ -57,9 +57,9 @@
 		--pid=$PID || true
 	    if [ "$AUTH_VERBOSITY" = "verbose" ]; then
-		lvremove $VERBOSE -f "$CHROOT_LVM_SNAPSHOT_DEVICE" || true
+		lvremove $VERBOSE -f "$CHROOT_LVM_SNAPSHOT_DEVICE" 2>&1 || true
-		lvremove $VERBOSE -f "$CHROOT_LVM_SNAPSHOT_DEVICE" > /dev/null || true
+		lvremove $VERBOSE -f "$CHROOT_LVM_SNAPSHOT_DEVICE" 2>&1 > /dev/null || true
 	    # The block device no longer exists, or was never created,

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