#! /usr/bin/python -E
#
# Copyright (C) 2007  Red Hat
# see file 'COPYING' for use and warranty information
#
# 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 only
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#

import os, sys

def daemonize():
    # fork once so the parent can exit
    try:
        pid = os.fork()
    except OSError, e:
        raise Exception, "%s [%d]" % (e.strerror, e.errno)

    if pid != 0:
        os._exit(0)

    # become session leader
    os.setsid()
    
    # fork again to reparent to init
    try:
        pid = os.fork()
    except OSError, e:
        raise Exception, "%s [%d]" % (e.strerror, e.errno)

    if pid != 0:
        os._exit(0)

    os.chdir("/")
    os.umask(0)

    import resource
    maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
    if (maxfd == resource.RLIM_INFINITY):
        maxfd = 1024
      
    # close all file descriptors
    for fd in range(0, maxfd):
        try:
            os.close(fd)
        except OSError:
            pass

    # stdin
    os.open("/dev/null", os.O_RDWR)
    # stdout
    os.open("/dev/null", os.O_RDWR)
    # stderr
    os.open("/dev/null", os.O_RDWR)

def main():
    # To make development easier, we detect if we are in the development
    # environment to load a different configuration and avoid becoming
    # a daemon
    devel = False
    if os.path.exists(os.path.join(os.path.dirname(__file__), "Makefile.am")):
        devel = True

    if not devel:
        try:
            daemonize()
        except Exception, e:
            sys.stderr.write("error becoming daemon: " + str(e))
            sys.exit(1)

    sys.path.append("/usr/share/ipa/")

    # this must be after sys.path is changed to work correctly
    import pkg_resources
    pkg_resources.require("TurboGears")
    pkg_resources.require("ipa_gui")


    from turbogears import update_config, start_server
    import cherrypy
    cherrypy.lowercase_api = True

    # Load the config - look for a local file first for development
    # and then the system config file
    if devel:
        update_config(configfile="dev.cfg",
                      modulename="ipagui.config")
    else:
        update_config(configfile="/usr/share/ipa/ipa-webgui.cfg",
                      modulename="ipagui.config.app")

    from ipagui.controllers import Root

    start_server(Root())

try:
    main()
except Exception, e:
    print "failed to start web gui: %s" % str(e)
    sys.exit(1)