#!/usr/bin/python

# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
#
# This file is part of Ansible
#
# Ansible 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, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible 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 Ansible.  If not, see <http://www.gnu.org/licenses/>.
#

import sys
import os
import shlex
import syslog

# ===========================================
# convert arguments of form a=b c=d
# to a dictionary
# FIXME: make more idiomatic

if len(sys.argv) == 1:
    sys.exit(1)
argfile = sys.argv[1]
if not os.path.exists(argfile):
    sys.exit(1)

args = open(argfile, 'r').read()
items = shlex.split(args)
syslog.openlog('ansible-%s' % os.path.basename(__file__))
syslog.syslog(syslog.LOG_NOTICE, 'Invoked with %s' % args)


params = {}
for x in items:
    (k, v) = x.split("=")
    params[k] = v

src  = params['src']
dest = params['dest']
if src:
    src = os.path.expanduser(src)
if dest:
    dest = os.path.expanduser(dest)
 
# raise an error if there is no src file
if not os.path.exists(src):
    print "failed=1 msg='Source %s failed to transfer'" % src
    sys.exit(1)

md5sum = None
changed = False
if os.path.exists(dest):
    md5sum = os.popen("md5sum %s" % dest).read().split()[0]

md5sum2 = os.popen("md5sum %s" % src).read().split()[0]

if md5sum != md5sum2:
    os.system("cp %s %s" % (src, dest))
    changed = True

# mission accomplished
print "md5sum=%s changed=%s" % (md5sum2, changed)