dom0-updates: clean local repo when --clean given

dom0-updates/qubes-dom0-update

@@ -27,12 +27,15 @@ GUI=
 CHECK_ONLY=
 ALL_OPTS=$*
 QVMRUN_OPTS=
+CLEAN=
 # Filter out some yum options and collect packages list
 while [ $# -gt 0 ]; do
     case "$1" in
         --enablerepo=*|\
-        --disablerepo=*|\
+        --disablerepo=*)
+            ;;
         --clean)
+            CLEAN=1
             ;;
         --gui)
             GUI=1
@@ -71,6 +74,10 @@ if [ "$CHECK_ONLY" == "1" ] && ! xl domid $UPDATEVM > /dev/null 2>&1; then
     exit 1
 fi
 
+if [ -n "$CLEAN" ]; then
+    rm -f /var/lib/qubes/updates/rpm/*
+fi
+
 # We should ensure the clocks in Dom0 and UpdateVM are in sync
 # becuase otherwise yum might complain about future timestamps
 qvm-sync-clock