Fix buildsystem to detect udev > version 124

udev removed the udevinfo symlink from versions higher than 123 and
xen's build-system could not detect if udev is in place and has the
required version.

Signed-off-by: Marc-A. Dahlhaus <mad@wol.de>

install.sh

@@ -30,6 +30,8 @@ echo "Installing Xen from '$src' to '$dst'..."
 [ -x "$(which udevinfo)" ] && \
   UDEV_VERSION=$(udevinfo -V | sed -e 's/^[^0-9]* \([0-9]\{1,\}\)[^0-9]\{0,\}/\1/')
 
+[ -z "$UDEV_VERSION" -a -x /sbin/udevadm ] && UDEV_VERSION=$(/sbin/udevadm -V)
+
 if [ -n "$UDEV_VERSION" ] && [ $UDEV_VERSION -ge 059 ]; then
   echo " - installing for udev-based system"
   rm -rf "$tmp/etc/hotplug"

tools/check/check_udev

@@ -8,8 +8,10 @@ OpenBSD|NetBSD|FreeBSD)
 	has_or_fail vnconfig
 	;;
 Linux)
-	has_or_fail udevinfo
-	[ "`udevinfo -V | awk '{print $NF}'`" -ge 59 ] 2>/dev/null || \
+	has /sbin/udevadm && udevver=`/sbin/udevadm -V`
+	[ -z "$udevver" ] && has_or_fail udevinfo && \
+		udevver=`udevinfo -V | awk '{print $NF}'`
+	[ "$udevver" -ge 59 ] 2>/dev/null || \
 		has hotplug || \
 		fail "udev is too old, upgrade to version 59 or later"
 	;;

tools/hotplug/Linux/Makefile

@@ -24,6 +24,12 @@ XEN_SCRIPT_DATA += vtpm-migration.sh vtpm-impl
 XEN_HOTPLUG_DIR = $(CONFIG_DIR)/hotplug
 XEN_HOTPLUG_SCRIPTS = xen-backend.agent
 
+ifeq ($(shell [ -x /sbin/udevadm ] && echo 1),1)
+UDEVINFO = /sbin/udevadm
+else
+UDEVINFO = /usr/bin/udevinfo
+endif
+
 UDEV_RULES_DIR = $(CONFIG_DIR)/udev
 UDEV_RULES = xen-backend.rules xend.rules
 
@@ -32,7 +38,7 @@ DE = $(if $(DESTDIR),$(shell readlink -f $(DESTDIR)),)
 ifeq ($(findstring $(DI),$(DE)),$(DI))
 HOTPLUGS=install-hotplug install-udev
 else
-ifeq ($(shell [ -x /usr/bin/udevinfo ] && [ `/usr/bin/udevinfo -V | sed -e 's/^[^0-9]* \([0-9]\{1,\}\)[^0-9]\{0,\}/\1/'` -ge 059 ] && echo 1),1)
+ifeq ($(shell [ -x $(UDEVINFO) -a `$(UDEVINFO) -V | sed -e 's/^[^0-9]* \([0-9]\{1,\}\)[^0-9]\{0,\}/\1/'` -ge 059 ] && echo 1),1)
 HOTPLUGS=install-udev
 else
 HOTPLUGS=install-hotplug