Pass --verbose to `snap info` so that it includes the base.

debian/changelog

@@ -1,3 +1,9 @@
+livecd-rootfs (2.646) UNRELEASED; urgency=medium
+
+  * Pass --verbose to `snap info` so that it includes the base.
+
+ -- Iain Lane <iain.lane@canonical.com>  Mon, 24 Feb 2020 09:55:46 +0000
+
 livecd-rootfs (2.645) focal; urgency=medium
 
   [ Robert C Jennings ]

live-build/functions

@@ -490,7 +490,7 @@ _snap_preseed() {
             # Determine if and what core snap is needed
             local snap_info
 
-            snap_info=$(snap info "${SNAP_NAME}")
+            snap_info=$(snap info --verbose "${SNAP_NAME}")
 
             if [ $? -ne 0 ]; then
                 echo "Failed to retrieve base of $SNAP_NAME!"