view mercurial/txnutil.py @ 37012:fc8939825632

debugcommands: support connecting to HTTP peers Now that we have the plumbing for logging socket activity, let's hook it up to `hg debugwireproto` so we can collect low-level activity on sockets. The new code is a bit incomplete. But it is better than nothing: `hg debugwireproto` is still heavily evolving. The added test demonstrates some interesting behavior. For example, we're calling socket.makefile() and doing I/O on that. TIL. We're also sending an "Accept-Encoding: identity" request header. Differential Revision: https://phab.mercurial-scm.org/D2726
author Gregory Szorc <gregory.szorc@gmail.com>
date Tue, 13 Mar 2018 10:02:03 -0700
parents 206532700213
children 2372284d9457
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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('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('%s.pending' % filename, **kwargs), True)
        except IOError as inst:
            if inst.errno != errno.ENOENT:
                raise
    return (vfs(filename, **kwargs), False)