[PATCH v2] NetBSD hotplug: fix block unconfigure on destroy

[Manuel Bouyer <bouyer@netbsd.org>]

When a domain is destroyed, xparams may not be available any more when
the block script is called to unconfigure the vnd.
Check xparam only at configure time, and just unconfigure any vnd present
in the xenstore.

Signed-off-by: Manuel Bouyer <bouyer@netbsd.org>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
---
 tools/hotplug/NetBSD/block | 37 ++++++++++++++-----------------------
 1 file changed, 14 insertions(+), 23 deletions(-)

diff --git a/tools/hotplug/NetBSD/block b/tools/hotplug/NetBSD/block
index 2a0516f436..c8b31a7b2b 100644
--- a/tools/hotplug/NetBSD/block
+++ b/tools/hotplug/NetBSD/block
@@ -20,37 +20,28 @@ error() {
 xpath=$1
 xstatus=$2
 xparams=$(xenstore-read "$xpath/params")
-if [ -b "$xparams" ]; then
-	xtype="phy"
-elif [ -f "$xparams" ]; then
-	xtype="file"
-elif [ -z "$xparams" ]; then
-	error "$xpath/params is empty, unable to attach block device."
-else
-	error "$xparams is not a valid file type to use as block device." \
-	      "Only block and regular image files accepted."
-fi
 
 case $xstatus in
 6)
 	# device removed
-	case $xtype in
-	file)
-		vnd=$(xenstore-read "$xpath/vnd" || echo none)
-		if [ $vnd != none ]; then
-			vnconfig -u $vnd
-		fi
-		;;
-	phy)
-		;;
-	*)
-		echo "unknown type $xtype" >&2
-		;;
-	esac
+	vnd=$(xenstore-read "$xpath/vnd" || echo none)
+	if [ $vnd != none ]; then
+		vnconfig -u $vnd
+	fi
 	xenstore-rm $xpath
 	exit 0
 	;;
 2)
+	if [ -b "$xparams" ]; then
+		xtype="phy"
+	elif [ -f "$xparams" ]; then
+		xtype="file"
+	elif [ -z "$xparams" ]; then
+		error "$xpath/params is empty, unable to attach block device."
+	else
+		error "$xparams is not a valid file type to use as block device." \
+		      "Only block and regular image files accepted."
+	fi
 	case $xtype in
 	file)
 		# Store the list of available vnd(4) devices in
-- 
2.29.2