mercurial/sshpeer.py

35978:80a2b8ae42a1

    def badresponse():
        msg = _('no suitable response from remote hg')
        hint = ui.config('ui', 'ssherrorhint')
        raise error.RepoError(msg, hint=hint)

    requestlog = ui.configbool('devel', 'debug.peer-request')

    try:
        pairsarg = '%s-%s' % ('0' * 40, '0' * 40)
        handshake = [

    else:
        badresponse()

    caps = set()
    for l in reversed(lines):
        if l.startswith('capabilities:'):
            caps.update(l[:-1].split(':')[1].split())
            break

    return caps

35979:a622a927fe03

    def badresponse():
        msg = _('no suitable response from remote hg')
        hint = ui.config('ui', 'ssherrorhint')
        raise error.RepoError(msg, hint=hint)

    # The handshake consists of sending 2 wire protocol commands:
    # ``hello`` and ``between``.
    #
    # The ``hello`` command (which was introduced in Mercurial 0.9.1)
    # instructs the server to advertise its capabilities.
    #
    # The ``between`` command (which has existed in all Mercurial servers
    # for as long as SSH support has existed), asks for the set of revisions
    # between a pair of revisions.
    #
    # The ``between`` command is issued with a request for the null
    # range. If the remote is a Mercurial server, this request will
    # generate a specific response: ``1\n\n``. This represents the
    # wire protocol encoded value for ``\n``. We look for ``1\n\n``
    # in the output stream and know this is the response to ``between``
    # and we're at the end of our handshake reply.
    #
    # The response to the ``hello`` command will be a line with the
    # length of the value returned by that command followed by that
    # value. If the server doesn't support ``hello`` (which should be
    # rare), that line will be ``0\n``. Otherwise, the value will contain
    # RFC 822 like lines. Of these, the ``capabilities:`` line contains
    # the capabilities of the server.
    #
    # In addition to the responses to our command requests, the server
    # may emit "banner" output on stdout. SSH servers are allowed to
    # print messages to stdout on login. Issuing commands on connection
    # allows us to flush this banner output from the server by scanning
    # for output to our well-known ``between`` command. Of course, if
    # the banner contains ``1\n\n``, this will throw off our detection.

    requestlog = ui.configbool('devel', 'debug.peer-request')

    try:
        pairsarg = '%s-%s' % ('0' * 40, '0' * 40)
        handshake = [

    else:
        badresponse()

    caps = set()
    for l in reversed(lines):
        # Look for response to ``hello`` command. Scan from the back so
        # we don't misinterpret banner output as the command reply.
        if l.startswith('capabilities:'):
            caps.update(l[:-1].split(':')[1].split())
            break

    return caps