From 095ff1cb4ab3923ac31fb269df8e390438e492b4 Mon Sep 17 00:00:00 2001
From: Todd Gamblin <tgamblin@llnl.gov>
Date: Tue, 12 May 2015 14:52:41 -0700
Subject: [PATCH] Add debug handler to print a stacktrace on Ctrl-C in debug
mode.
---
bin/spack | 4 +++
lib/spack/spack/util/debug.py | 52 +++++++++++++++++++++++++++++++++++
2 files changed, 56 insertions(+)
create mode 100644 lib/spack/spack/util/debug.py
diff --git a/bin/spack b/bin/spack
index 013acf4db8..7dd3dbabbb 100755
--- a/bin/spack
+++ b/bin/spack
@@ -93,6 +93,10 @@ def main():
tty.set_debug(args.debug)
spack.debug = args.debug
+ if spack.debug:
+ import spack.util.debug as debug
+ debug.register_interrupt_handler()
+
spack.spack_working_dir = working_dir
if args.mock:
from spack.packages import PackageDB
diff --git a/lib/spack/spack/util/debug.py b/lib/spack/spack/util/debug.py
new file mode 100644
index 0000000000..37985eccdd
--- /dev/null
+++ b/lib/spack/spack/util/debug.py
@@ -0,0 +1,52 @@
+##############################################################################
+# Copyright (c) 2013-2015, Lawrence Livermore National Security, LLC.
+# Produced at the Lawrence Livermore National Laboratory.
+#
+# This file is part of Spack.
+# Written by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
+# LLNL-CODE-647188
+#
+# For details, see https://scalability-llnl.github.io/spack
+# Please also see the LICENSE file for our notice and the LGPL.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License (as published by
+# the Free Software Foundation) version 2.1 dated February 1999.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
+# conditions of the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+##############################################################################
+"""Debug signal handler: prints a stack trace and enters interpreter.
+
+``register_interrupt_handler()`` enables a ctrl-C handler that prints
+a stack trace and drops the user into an interpreter.
+
+"""
+import os
+import code
+import traceback
+import signal
+
+def debug_handler(sig, frame):
+ """Interrupt running process, and provide a python prompt for
+ interactive debugging."""
+ d = {'_frame':frame} # Allow access to frame object.
+ d.update(frame.f_globals) # Unless shadowed by global
+ d.update(frame.f_locals)
+
+ i = code.InteractiveConsole(d)
+ message = "Signal received : entering python shell.\nTraceback:\n"
+ message += ''.join(traceback.format_stack(frame))
+ i.interact(message)
+ os._exit(1) # Use os._exit to avoid test harness.
+
+
+def register_interrupt_handler():
+ """Register a handler to print a stack trace and enter an interpreter on Ctrl-C"""
+ signal.signal(signal.SIGINT, debug_handler)
--
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