upstream/mercurial-mirror Files · hgext/inotify/common.py

pager: preserve Hg's exit code (and fix Windows support) (issue3225)...

pager: preserve Hg's exit code (and fix Windows support) (issue3225) This changes how the pager extension invokes the pager. Prior to this change, the extension would fork Hg and exec the pager in the parent process. This loses Hg exit code, and it doesn't work on Windows. Now the pager is invoked using the subprocess library, and an atexit handler is registered that makes Hg wait for the pager to exit before it exits itself. Note that if you exit the pager before Hg is done running, you'll get an exit code of 255, which is caused by Python blowing up due to a broken pipe. If you set pager.quiet=True, you'll get the OS-level return code of 141.

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             common.py
        
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      # server.py - inotify common protocol code

      #

      # Copyright 2006, 2007, 2008 Bryan O'Sullivan <bos@serpentine.com>

      # Copyright 2007, 2008 Brendan Cully <brendan@kublai.com>

      #

      # This software may be used and distributed according to the terms of the

      # GNU General Public License version 2 or any later version.

      import cStringIO, socket, struct

      """

        Protocol between inotify clients and server:

        Client sending query:

        1) send protocol version number

        2) send query type (string, 4 letters long)

        3) send query parameters:

           - For STAT, N+1 \0-separated strings:

              1) N different names that need checking

              2) 1 string containing all the status types to match

           - No parameter needed for DBUG

        Server sending query answer:

        1) send protocol version number

        2) send query type

        3) send struct.pack'ed headers describing the length of the content:

            e.g. for STAT, receive 9 integers describing the length of the

            9 \0-separated string lists to be read:

             * one file list for each lmar!?ic status type

             * one list containing the directories visited during lookup

      """

      version = 3

      resphdrfmts = {

          'STAT': '>lllllllll', # status requests

          'DBUG': '>l'          # debugging queries

      }

      resphdrsizes = dict((k, struct.calcsize(v))

                          for k, v in resphdrfmts.iteritems())

      def recvcs(sock):

          cs = cStringIO.StringIO()

          s = True

          try:

              while s:

                  s = sock.recv(65536)

                  cs.write(s)

          finally:

              sock.shutdown(socket.SHUT_RD)

          cs.seek(0)

          return cs

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				# server.py - inotify common protocol code
				#
				# Copyright 2006, 2007, 2008 Bryan O'Sullivan <bos@serpentine.com>
				# Copyright 2007, 2008 Brendan Cully <brendan@kublai.com>
				#
				# This software may be used and distributed according to the terms of the
				# GNU General Public License version 2 or any later version.

				import cStringIO, socket, struct

				"""
				Protocol between inotify clients and server:

				Client sending query:
				1) send protocol version number
				2) send query type (string, 4 letters long)
				3) send query parameters:
				- For STAT, N+1 \0-separated strings:
				1) N different names that need checking
				2) 1 string containing all the status types to match
				- No parameter needed for DBUG

				Server sending query answer:
				1) send protocol version number
				2) send query type
				3) send struct.pack'ed headers describing the length of the content:
				e.g. for STAT, receive 9 integers describing the length of the
				9 \0-separated string lists to be read:
				* one file list for each lmar!?ic status type
				* one list containing the directories visited during lookup

				"""

				version = 3

				resphdrfmts = {
				'STAT': '>lllllllll', # status requests
				'DBUG': '>l' # debugging queries
				}
				resphdrsizes = dict((k, struct.calcsize(v))
				for k, v in resphdrfmts.iteritems())

				def recvcs(sock):
				cs = cStringIO.StringIO()
				s = True
				try:
				while s:
				s = sock.recv(65536)
				cs.write(s)
				finally:
				sock.shutdown(socket.SHUT_RD)
				cs.seek(0)
				return cs