view mercurial/txnutil.py @ 35503:bbcd2e478391

test-lfs: add tests covering http exchanges

This tries to test every combination of having the extension enabled/disabled
on each side, and then push/pull/clone/identify lfs and non-lfs content.  SSH is
ignored here, because there's enough going on as it is.

The root issue here is again that requirements are not exchanged and preserved
on push/pull/clone.  Doing so should eliminate the cryptic error messages when
using `hg serve`.  The 500 server error is triggered by "ValueError: no common
changegroup version", because the extension forces changegroup3.  Or, if
changegroup3 is enabled manually, it is triggered by "abort: missing processor
for flag '0x2000'!".

Sadly, run-tests.py doesn't support conditionalizing the exit code like it does
lines of output.  Therefore, a couple of tests blot out the exit code by
appending "|| true", since these failures will go away shortly anyway.

# txnutil.py - transaction related utilities
#
#  Copyright FUJIWARA Katsunori <[e-mail]> 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)