upstream/mercurial-mirror Files · mercurial/txnutil.py

linelog: be more careful about types before looking for _target attribute...

linelog: be more careful about types before looking for _target attribute Without this, pytype (correctly) complains that fakejge might not have a _cmprev attribute. We're operating on some constraints not expressible in the type system, so we detect the invalid case and raise a nicer exception now. Sadly, we also need an `assert` to give PyType a clue that we know what we're doing, but I can absolutely live with that. Differential Revision: https://phab.mercurial-scm.org/D7271

Augie Fackler - - Load All Authors

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      # txnutil.py - transaction related utilities

      #

      #  Copyright FUJIWARA Katsunori <foozy@lares.dti.ne.jp> and others

      #

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

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

      from __future__ import absolute_import

      import errno

      from . import encoding

      def mayhavepending(root):

          '''return whether 'root' may have pending changes, which are

          visible to this process.

          '''

          return root == encoding.environ.get(b'HG_PENDING')

      def trypending(root, vfs, filename, **kwargs):

          '''Open  file to be read according to HG_PENDING environment variable

          This opens '.pending' of specified 'filename' only when HG_PENDING

          is equal to 'root'.

          This returns '(fp, is_pending_opened)' tuple.

          '''

          if mayhavepending(root):

              try:

                  return (vfs(b'%s.pending' % filename, **kwargs), True)

              except IOError as inst:

                  if inst.errno != errno.ENOENT:

                      raise

          return (vfs(filename, **kwargs), False)

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				# txnutil.py - transaction related utilities
				#
				# Copyright FUJIWARA Katsunori <foozy@lares.dti.ne.jp> and others
				#
				# This software may be used and distributed according to the terms of the
				# GNU General Public License version 2 or any later version.

				from __future__ import absolute_import

				import errno

				from . import encoding


				def mayhavepending(root):
				'''return whether 'root' may have pending changes, which are
				visible to this process.
				'''
				return root == encoding.environ.get(b'HG_PENDING')


				def trypending(root, vfs, filename, **kwargs):
				'''Open file to be read according to HG_PENDING environment variable

				This opens '.pending' of specified 'filename' only when HG_PENDING
				is equal to 'root'.

				This returns '(fp, is_pending_opened)' tuple.
				'''
				if mayhavepending(root):
				try:
				return (vfs(b'%s.pending' % filename, **kwargs), True)
				except IOError as inst:
				if inst.errno != errno.ENOENT:
				raise
				return (vfs(filename, **kwargs), False)