From 59c5973c85c27cd71bbc1a2b96c4f537b30c8b49 Mon Sep 17 00:00:00 2001
From: Ben Hutchings <ben@decadent.org.uk>
Date: Sat, 12 Apr 2008 16:51:53 +0000
Subject: [PATCH] Added check for missing or empty output file in
 generate_menu_vob().

---
 generate_dvd.cpp | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/generate_dvd.cpp b/generate_dvd.cpp
index d5185c2..bf1c2b2 100644
--- a/generate_dvd.cpp
+++ b/generate_dvd.cpp
@@ -1,4 +1,4 @@
-// Copyright 2005-6 Ben Hutchings <ben@decadent.org.uk>.
+// Copyright 2005-8 Ben Hutchings <ben@decadent.org.uk>.
 // See the file "COPYING" for licence details.
 
 #include <cerrno>
@@ -10,6 +10,10 @@
 #include <sstream>
 #include <stdexcept>
 
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
 #include <gdkmm/pixbuf.h>
 #include <glibmm/miscutils.h>
 #include <glibmm/spawn.h>
@@ -234,6 +238,9 @@ void dvd_generator::generate_menu_vob(unsigned index,
     if (!spumux_file)
 	throw std::runtime_error("Failed to write control file for spumux");
 
+    std::string output_name(
+	temp_file_name(temp_dir_, "menu-%3d.mpeg", 1 + index));
+
     std::ostringstream command_stream;
     unsigned frame_count(menu_duration_frames(frame_params_));
     if (encoder_ == mpeg_encoder_ffmpeg)
@@ -279,8 +286,7 @@ void dvd_generator::generate_menu_vob(unsigned index,
 	    " | mplex -v0 -f8 -o/dev/stdout /dev/stdin";
     }
     command_stream
-	<< " | spumux -v0 -mdvd " << spumux_name
-	<< " > " << temp_file_name(temp_dir_, "menu-%3d.mpeg", 1 + index);
+	<< " | spumux -v0 -mdvd " << spumux_name << " > " << output_name;
     std::string command(command_stream.str());
     const char * argv[] = {
 	"/bin/sh", "-c", command.c_str(), 0
@@ -295,7 +301,9 @@ void dvd_generator::generate_menu_vob(unsigned index,
 		     sigc::slot<void>(),
 		     0, 0,
 		     &command_result);
-    if (command_result != 0)
+    struct stat stat_buf;
+    if (command_result != 0 || stat(output_name.c_str(), &stat_buf) != 0
+	|| stat_buf.st_size == 0)
 	throw std::runtime_error("spumux pipeline failed");
 }
 
-- 
2.39.2