From 3ab6538433fdbed6903e1c5f5b63054e0d056666 Mon Sep 17 00:00:00 2001
From: Werner Koch <wk@gnupg.org>
Date: Wed, 8 Feb 2023 08:23:31 +0100
Subject: [PATCH] tools: Return a better error message if sendmail is not
 usable.

* tools/send-mail.c: Include unistd.h
(run_sendmail): Check for bad sendmail.
--

GnuPG-bug-id: 6321
---
 tools/send-mail.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/send-mail.c b/tools/send-mail.c
index 6492c43c1..d348f28cb 100644
--- a/tools/send-mail.c
+++ b/tools/send-mail.c
@@ -22,6 +22,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>   /* for X_OK */
 
 #include "../common/util.h"
 #include "../common/exectool.h"
@@ -36,6 +37,12 @@ run_sendmail (estream_t data)
   const char pgmname[] = NAME_OF_SENDMAIL;
   const char *argv[3];
 
+  if (!*pgmname || gnupg_access (pgmname, X_OK))
+    {
+      log_error ("sendmail tool '%s' is not correctly installed\n", pgmname);
+      return gpg_error (GPG_ERR_ENOENT);
+    }
+
   argv[0] = "-oi";
   argv[1] = "-t";
   argv[2] = NULL;