From 9fdc4956027b4e1617a834424745af41cd85dc70 Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Wed, 21 Jun 2017 16:08:29 +0100
Subject: [PATCH] appliance/init: Allow daemon stack traces to be captured by
 gdb.

This fragment, not enabled by default, allows stack traces to be
captured and displayed by gdb in case the daemon crashes.
---
 appliance/init | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/appliance/init b/appliance/init
index 50a1dc3bd..44230d6f6 100755
--- a/appliance/init
+++ b/appliance/init
@@ -171,6 +171,19 @@ fi
 if test "$guestfs_network" = 1; then
     cmd="$cmd --network"
 fi
+if false; then
+    # To get a stack trace if the daemon crashes:
+    # (1) change this section to 'if true'
+    # (2) add 'gdb' to 'appliance/packagelist.in'
+    unset LD_PRELOAD
+    echo set pagination off  > /tmp/gdb-script
+    echo run                >> /tmp/gdb-script
+    echo info registers     >> /tmp/gdb-script
+    echo 'x/16i $pc'        >> /tmp/gdb-script
+    echo t a a bt           >> /tmp/gdb-script
+    echo quit               >> /tmp/gdb-script
+    cmd="gdb -batch -x /tmp/gdb-script --args $cmd"
+fi
 if ! test "$guestfs_rescue" = 1; then
     echo $cmd
     $cmd