check the tree even more afterwards, to be safe

scripts/build.sh

@@ -25,3 +25,45 @@ pax -rw LICENSE.txt dist site/
 rm -f site/dist/tests.js
 find site -type d -print0 | xargs -0r chmod 0755 --
 find site -type f -print0 | xargs -0r chmod 0644 --
+set +ex
+rv=0
+x=$(find site \( ! -type d -a ! -type f -a ! -type l \) -ls) || {
+	print -ru2 -- "E: could not check for bogus filetypes"
+	rv=1
+	x=
+}
+[[ -z $x ]] || {
+	print -ru2 -- "E: bogus filetypes found"
+	print -r -- "$x" | sed 's/^/N: /' >&2
+	rv=1
+}
+if [[ $(find --help 2>&1) = *' -printf '* ]]; then
+	x=$(find site -type l -printf '(%Y)%p\n') || {
+		print -ru2 -- "E: could not check for dangling symlinks"
+		rv=1
+		x=
+	}
+	[[ -z $(print -r -- "$x" | grep -v '^[(][dfN][)]') ]] || {
+		print -ru2 -- "E: bad filetypes found"
+		print -r -- "$x" | sed 's/^/N: /' >&2
+		rv=1
+	}
+	x=$(print -r -- "$x" | grep '^[(]N[)]')
+	[[ -z $x ]] || {
+		if [[ -n $IS_ACTUAL_DEBIAN_BUILD ]]; then
+			pf=W:
+			(( rv |= 2 ))
+		else
+			pf=E:
+			rv=1
+		fi
+		print -ru2 -- "$pf dangling symlinks found"
+		print -r -- "$x" | sed 's/^/N: /' >&2
+	}
+fi
+if (( rv & 1 )); then
+	exit 1
+elif (( rv == 0 )); then
+	print -ru2 -- "I: build done"
+fi
+exit 0