re-add sha script; it's used in the Makefile

While there, use it in the tests too

regress/lib.sh

@@ -159,23 +159,6 @@ check() {
 	return 1
 }
 
-# usage: sha in out
-# writes the sha256 of `in' to `out'
-sha() {
-	if which sha256 >/dev/null 2>&1; then
-		sha256 < "$1" > "$2"
-		return $?
-	fi
-
-	if which sha256sum >/dev/null 2>&1; then
-		sha256sum "$1" | awk '{print $1}' > "$2"
-		return $?
-	fi
-
-	echo "No sha binary found" >&2
-	exit 1
-}
-
 count() {
 	wc -l | xargs
 }

regress/sha

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+# USAGE: ./sha in out
+# writes the sha256 of in to file out
+
+if which sha256 2>/dev/null >/dev/null; then
+	exec sha256 < "$1" > "$2"
+fi
+
+if which sha256sum 2>/dev/null >/dev/null; then
+	sha256sum "$1" | awk '{print $1}' > "$2"
+	exit $?
+fi
+
+echo "No sha binary found"
+exit 1

regress/tests.sh

@@ -38,7 +38,7 @@ test_serve_big_files() {
 
 	hdr="$(head /bigfile)"
 	get /bigfile > bigfile
-	sha bigfile bigfile.sha
+	./sha bigfile bigfile.sha
 	body="$(cat bigfile.sha)"
 
 	check_reply "20 application/octet-stream" "$(cat testdata/bigfile.sha)"
@@ -99,7 +99,7 @@ test_cgi_big_replies() {
 
 	hdr="$(head /serve-bigfile)"
 	get /bigfile > bigfile
-	sha bigfile bigfile.sha
+	./sha bigfile bigfile.sha
 	body="$(cat bigfile.sha)"
 	check_reply "20 application/octet-stream" "$(cat testdata/bigfile.sha)"
 }