From 7bd9beb8125a3a2b1c4ee137b3fb22ae87f5726b Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 25 Jun 2018 09:31:19 +0200
Subject: Set QEMU_AUDIO_DRV to 'none' to disable audio output

---
 bbot/agent/machine.cxx |  5 +++--
 bbot/utility.hxx       |  6 +++---
 bbot/utility.txx       | 11 ++++-------
 3 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/bbot/agent/machine.cxx b/bbot/agent/machine.cxx
index a8933bb..a1fe9bb 100644
--- a/bbot/agent/machine.cxx
+++ b/bbot/agent/machine.cxx
@@ -296,13 +296,14 @@ namespace bbot
     //
     // 1. echo system_powerdown | socat - UNIX-CONNECT:.../monitor
     //
+    const char* env[] = {"QEMU_AUDIO_DRV=none", // Disable audio output.
+                         nullptr};
     proc = run_io_start (
       trace,
       fdnull (),
       2,
       2,
-      md, // Run from the machine's directory.
-      kvm,
+      process_env (kvm, md, env), // Run from the machine's directory.
       "-boot", "c", // Boot from disk.
       "-no-reboot", // Exit on VM reboot.
       "-m",   to_string (ram / 1024) + "M",
diff --git a/bbot/utility.hxx b/bbot/utility.hxx
index ee74816..c9cd95d 100644
--- a/bbot/utility.hxx
+++ b/bbot/utility.hxx
@@ -61,6 +61,7 @@ namespace bbot
   class tracer;
 
   using butl::process;
+  using butl::process_env;
   using butl::process_exit;
   using butl::process_error;
 
@@ -72,14 +73,13 @@ namespace bbot
   process_exit::code_type
   run_io_exit (tracer&, I&& in, O&& out, E&& err, const P&, A&&...);
 
-  template <typename I, typename O, typename E, typename P, typename... A>
+  template <typename I, typename O, typename E, typename... A>
   process
   run_io_start (tracer&,
                 I&& in,
                 O&& out,
                 E&& err,
-                const dir_path& cwd,
-                const P&,
+                const process_env&,
                 A&&...);
 
   template <typename P>
diff --git a/bbot/utility.txx b/bbot/utility.txx
index b3d6d53..43d995a 100644
--- a/bbot/utility.txx
+++ b/bbot/utility.txx
@@ -15,14 +15,13 @@ namespace bbot
 {
   // run_*()
   //
-  template <typename I, typename O, typename E, typename P, typename... A>
+  template <typename I, typename O, typename E, typename... A>
   process
   run_io_start (tracer& t,
                 I&& in,
                 O&& out,
                 E&& err,
-                const dir_path& cwd,
-                const P& p,
+                const process_env& pe,
                 A&&... args)
   {
     try
@@ -32,12 +31,12 @@ namespace bbot
         forward<I> (in),
         forward<O> (out),
         forward<E> (err),
-        butl::process_env (p, cwd),
+        pe,
         forward<A> (args)...);
     }
     catch (const process_error& e)
     {
-      fail << "unable to execute " << p << ": " << e << endf;
+      fail << "unable to execute " << *pe.path << ": " << e << endf;
     }
   }
 
@@ -78,7 +77,6 @@ namespace bbot
                               forward<I> (in),
                               forward<O> (out),
                               forward<E> (err),
-                              dir_path (),
                               p,
                               forward<A> (args)...));
 
@@ -93,7 +91,6 @@ namespace bbot
                               forward<I> (in),
                               forward<O> (out),
                               forward<E> (err),
-                              dir_path (),
                               p,
                               forward<A> (args)...));
     run_io_finish (t, pr, p);
-- 
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