upstream/mercurial-mirror Files · contrib/showstack.py

rhg: use `Command::exec` instead of `Command::status`...

rhg: use `Command::exec` instead of `Command::status` `rhg` is supposed to be a transparent executable, using a subprocess defeats that purpose. See inline comments for more details. This also introduces the `which` crate to check if the fallback executable actually exists to help debugging (plain `execve` doesn't give much information). The error code 253 is used to signify that the fallback is not found, but may mean in the future that it is otherwise invalid if we start being more specific. Differential Revision: https://phab.mercurial-scm.org/D12578

Gregory Szorc - - Load All Authors

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             showstack.py
        
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      # showstack.py - extension to dump a Python stack trace on signal

      #

      # binds to both SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)

      r"""dump stack trace when receiving SIGQUIT (Ctrl-\) or SIGINFO (Ctrl-T on BSDs)

      """

      from __future__ import absolute_import, print_function

      import signal

      import sys

      import traceback

      def sigshow(*args):

          sys.stderr.write("\n")

          traceback.print_stack(args[1], limit=10, file=sys.stderr)

          sys.stderr.write("----\n")

      def sigexit(*args):

          sigshow(*args)

          print('alarm!')

          sys.exit(1)

      def extsetup(ui):

          signal.signal(signal.SIGQUIT, sigshow)

          signal.signal(signal.SIGALRM, sigexit)

          try:

              signal.signal(signal.SIGINFO, sigshow)

          except AttributeError:

              pass

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				# showstack.py - extension to dump a Python stack trace on signal
				#
				# binds to both SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)
				r"""dump stack trace when receiving SIGQUIT (Ctrl-\) or SIGINFO (Ctrl-T on BSDs)
				"""

				from __future__ import absolute_import, print_function
				import signal
				import sys
				import traceback


				def sigshow(*args):
				sys.stderr.write("\n")
				traceback.print_stack(args[1], limit=10, file=sys.stderr)
				sys.stderr.write("----\n")


				def sigexit(*args):
				sigshow(*args)
				print('alarm!')
				sys.exit(1)


				def extsetup(ui):
				signal.signal(signal.SIGQUIT, sigshow)
				signal.signal(signal.SIGALRM, sigexit)
				try:
				signal.signal(signal.SIGINFO, sigshow)
				except AttributeError:
				pass