Add debugging log.

src/in

@@ -16,6 +16,9 @@ if [ "$computed_version"  != "$VERSION" ]; then
 fi
 
 script="$(envsubst "$(< scripts/get_files.vars)" < "scripts/get_files.sh")"
+echo "tar c script:" >&2
+echo "$script" >&2
+
 if [ -n "$FILES" ]; then
     (
         cd "$1"

src/out

@@ -10,6 +10,8 @@ if [ -z "$FILES" ]; then
     extract=false
 fi
 script="$(EXTRACT="$extract" envsubst "$(< scripts/put_files.vars)" < scripts/put_files.sh)"
+echo "tar x script:" >&2
+echo "$script" >&2
 (
     cd "$1"
     pipe="$(tmpname)"