tesh: rerun the command in valgrind if it segfaults

This is particuly useful when experiencing segfaults in our test suite
on some exotic OS that has valgrind (say hello to FreeBSD here)

diff --git a/tools/tesh/tesh.py b/tools/tesh/tesh.py
index bec4533..1a6d8f3 100755 (executable)
--- a/tools/tesh/tesh.py
+++ b/tools/tesh/tesh.py
@@ -237,6 +237,7 @@ class Cmd:
         self.output_display = False
 
         self.sort = -1
+        self.rerun_with_valgrind = False
 
         self.ignore_regexps = TeshState().ignore_regexps_common
 
@@ -302,6 +303,12 @@ class Cmd:
             _thread.start_new_thread(Cmd._run, (self, lock))
         else:
             self._run()
+            if self.rerun_with_valgrind:
+                print('\n\n\nXXXXXXXXX Rerunning this test with valgrind to help debugging it XXXXXXXXX')
+                print('(this will fail if valgrind is not installed, of course)\n\n\n')
+
+                self.args = "valgrind " + self.args
+                self._run()
         return True
 
     def _run(self, lock=None):
@@ -470,6 +477,8 @@ class Cmd:
                     else:
                         logs.append("In addition, <{cmd}> got signal {sig}.".format(cmd=cmd_name,
                             sig=SIGNALS_TO_NAMES_DICT[-proc.returncode]))
+                    if proc.returncode == -signal.SIGSEGV:
+                        self.rerun_with_valgrind = True
 
                 if lock is not None:
                     lock.release()
@@ -505,6 +514,10 @@ class Cmd:
             logs.append("Test suite `{file}': NOK (<{cmd}> got signal {sig})".format(
                 file=FileReader().filename, cmd=cmd_name,
                 sig=SIGNALS_TO_NAMES_DICT[-proc.returncode]))
+
+            if proc.returncode == -signal.SIGSEGV:
+                self.rerun_with_valgrind = True
+
             if lock is not None:
                 lock.release()
             TeshState().set_return_code(max(-proc.returncode, 1))