--- a/snap.mk	Sat Aug 13 15:51:59 2022 +0200
+++ b/snap.mk	Sat Aug 13 16:30:38 2022 +0200
@@ -6,6 +6,7 @@
 
 Snap: snap_built
 snap_built: all_sources revisions.txt
-	tar -C $(src) $(tar_opts) -c snap revisions.txt | tar -C sources -x
+	tar -C $(src) $(tar_opts) -c snap | tar -C sources -x
+	cp revisions.txt sources
 	cd sources;  snapcraft --debug 
 	touch $@