1 files changed, 38 insertions, 44 deletions

diff --git a/src/launch.c b/src/launch.c
index e58add54..234f42e4 100644
--- a/src/launch.c
+++ b/src/launch.c
@@ -73,6 +73,7 @@
 
 static int launch_appliance (guestfs_h *g);
 static int64_t timeval_diff (const struct timeval *x, const struct timeval *y);
+static void print_qemu_command_line (guestfs_h *g, char **argv);
 static int connect_unix_socket (guestfs_h *g, const char *sock);
 static int qemu_supports (guestfs_h *g, const char *option);
 
@@ -650,9 +651,6 @@ launch_appliance (guestfs_h *g)
     incr_cmdline_size (g);
     g->cmdline[g->cmdline_size-1] = NULL;
 
-    if (g->verbose)
-      guestfs___print_timestamped_argv (g, (const char **)g->cmdline);
-
     if (!g->direct) {
       /* Set up stdin, stdout, stderr. */
       close (0);
@@ -682,6 +680,10 @@ launch_appliance (guestfs_h *g)
       close (rfd[1]);
     }
 
+    /* Dump the command line (after setting up stderr above). */
+    if (g->verbose)
+      print_qemu_command_line (g, g->cmdline);
+
     /* Put qemu in a new process group. */
     if (g->pgroup)
       setpgid (0, 0);
@@ -1002,47 +1004,9 @@ timeval_diff (const struct timeval *x, const struct timeval *y)
   return msec;
 }
 
-void
-guestfs___print_timestamped_argv (guestfs_h *g, const char * argv[])
-{
-  int i = 0;
-  int needs_quote;
-  char *buf = NULL;
-  size_t len;
-  FILE *fp;
-
-  fp = open_memstream (&buf, &len);
-  if (fp == NULL) {
-    warning (g, "open_memstream: %m");
-    return;
-  }
-
-  struct timeval tv;
-  gettimeofday (&tv, NULL);
-  fprintf (fp, "[%05" PRIi64 "ms] ", timeval_diff (&g->launch_t, &tv));
-
-  while (argv[i]) {
-    if (argv[i][0] == '-') /* -option starts a new line */
-      fprintf (fp, " \\\n   ");
-
-    if (i > 0) fputc (' ', fp);
-
-    /* Does it need shell quoting?  This only deals with simple cases. */
-    needs_quote = strcspn (argv[i], " ") != strlen (argv[i]);
-
-    if (needs_quote) fputc ('\'', fp);
-    fprintf (fp, "%s", argv[i]);
-    if (needs_quote) fputc ('\'', fp);
-    i++;
-  }
-
-  fclose (fp);
-
-  debug (g, "%s", buf);
-
-  free (buf);
-}
-
+/* Note that since this calls 'debug' it should only be called
+ * from the parent process.
+ */
 void
 guestfs___print_timestamped_message (guestfs_h *g, const char *fs, ...)
 {
@@ -1064,6 +1028,36 @@ guestfs___print_timestamped_message (guestfs_h *g, const char *fs, ...)
   free (msg);
 }
 
+/* This is called from the forked subprocess just before qemu runs, so
+ * it can just print the message straight to stderr, where it will be
+ * picked up and funnelled through the usual appliance event API.
+ */
+static void
+print_qemu_command_line (guestfs_h *g, char **argv)
+{
+  int i = 0;
+  int needs_quote;
+
+  struct timeval tv;
+  gettimeofday (&tv, NULL);
+  fprintf (stderr, "[%05" PRIi64 "ms] ", timeval_diff (&g->launch_t, &tv));
+
+  while (argv[i]) {
+    if (argv[i][0] == '-') /* -option starts a new line */
+      fprintf (stderr, " \\\n   ");
+
+    if (i > 0) fputc (' ', stderr);
+
+    /* Does it need shell quoting?  This only deals with simple cases. */
+    needs_quote = strcspn (argv[i], " ") != strlen (argv[i]);
+
+    if (needs_quote) fputc ('\'', stderr);
+    fprintf (stderr, "%s", argv[i]);
+    if (needs_quote) fputc ('\'', stderr);
+    i++;
+  }
+}
+
 static int read_all (guestfs_h *g, FILE *fp, char **ret);
 
 /* Test qemu binary (or wrapper) runs, and do 'qemu -help' and