xbps-src: add strict mode

common/environment/setup/vsed.sh

@@ -57,8 +57,13 @@ vsed() {
 			newdigest="$($XBPS_DIGEST_CMD "$f")"
 			newdigest="${newdigest%% *}"
 
+			msgfunc=msg_warn
+			if [ -n "$XBPS_STRICT" ]; then
+				msgfunc=msg_error
+			fi
+
 			if [ "$olddigest" = "$newdigest" ]; then
-				msg_warn "$pkgver: vsed: regex \"$rx\" didn't change file \"$f\"\n"
+				$msgfunc "$pkgver: vsed: regex \"$rx\" didn't change file \"$f\"\n"
 			fi
 			olddigest="${newdigest}"
 		done