remove regress/sha

we can use cmp to tell if two files are different, which also has
the benefit of being available everywhere and reporting the byte
offset of the first difference.  Reduces the test dependencies on
some systems.

ChangeLog

@@ -1,3 +1,7 @@
+2023-06-13  Omar Polo  <op@omarpolo.com>
+
+	* regress/sha: remove regress/sha; sha256/sha256sum is no more required for the regress suite.
+
 2022-09-10  Omar Polo  <op@omarpolo.com>
 
 	* parse.y (string): retire the deprecated `mime' and `map' config options

regress/Makefile

@@ -16,7 +16,6 @@ DISTFILES =	Makefile \
 		puny-test.c \
 		regress \
 		serve-bigfile \
-		sha \
 		slow \
 		tests.sh \
 		valid.ext
@@ -96,9 +95,7 @@ clean:
 testdata: fill-file
 	mkdir testdata
 	./fill-file testdata/bigfile
-	./sha testdata/bigfile testdata/bigfile.sha
 	printf "# hello world\n" > testdata/index.gmi
-	./sha testdata/index.gmi testdata/index.gmi.sha
 	cp hello slow err invalid serve-bigfile env testdata/
 	cp max-length-reply testdata
 	mkdir testdata/dir
@@ -111,4 +108,4 @@ dist: ${DISTFILES}
 	mkdir -p ${DESTDIR}/
 	${INSTALL} -m 0644 ${DISTFILES} ${DESTDIR}/
 	cd ${DESTDIR}/ && chmod +x env err hello invalid \
-		max-length-reply regress sha slow
+		max-length-reply regress slow

regress/sha

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

regress/tests.sh

@@ -48,10 +48,20 @@ test_serve_big_files() {
 
 	hdr="$(head /bigfile)"
 	get /bigfile > bigfile
-	./sha bigfile bigfile.sha
-	body="$(cat bigfile.sha)"
 
-	check_reply "20 application/octet-stream" "$(cat testdata/bigfile.sha)"
+	want="20 application/octet-stream"
+	if [ "$hdr" != "$want" ]; then
+		echo "Header mismatch" >&2
+		echo "wants : $want"   >&2
+		echo "got   : $hdr"    >&2
+		return 1
+	fi
+
+	if ! cmp -s bigfile testdata/bigfile; then
+		echo "received bigfile is not as expected"
+		cmp bigfile testdata/bigfile
+		return 1
+	fi
 }
 
 test_dont_execute_scripts() {