#!/usr/bin/env python3
#
# Copyright (C) 2014-2019  Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

'''Wait for a given port to be open.

WARNING: This may wait for quite a long time. There is no timeout. Or
spoon.

'''

import sys, socket, errno

host = sys.argv[1]
port = int(sys.argv[2])

while True:
    print("Trying %s port %s" % (host, port))
    s = socket.socket()
    try:
        s.connect((host, port))
    except socket.error as e:
        if e.errno == errno.ECONNREFUSED:
            continue
        raise
    s.close()
    break