#!/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

def dump_kv(vars):
    return " ".join("%s='%s'" % (k,v) for (k,v) in vars.items())

def exit_kv(rc=0, **kwargs):
    if 'path' in kwargs:
        add_path_info(kwargs)
    print dump_kv(kwargs)
    sys.exit(rc)

if len(sys.argv) == 1:
	exit_kv(rc=1, failed=1, msg="incorrect number of arguments given")

argfile = sys.argv[1]
if not os.path.exists(argfile):
	exit_kv(rc=1, failed=1, msg="file %s does not exist" % (argfile))

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):
	exit_kv(rc=1, failed=1, msg="Source %s failed to transfer" % (src))

if os.path.exists(dest):
    # raise an error if copy has no permission on dest
    if not os.access(dest, os.W_OK):
        exit_kv(rc=1, failed=1, msg="Destination %s not writable" % (dest))
    elif not os.access(dest, os.R_OK):
        exit_kv(rc=1, failed=1, msg="Destination %s not readable" % (dest))
else:
    if not os.access(os.path.dirname(dest), os.W_OK):
        exit_kv(rc=1, failed=1, msg="Destination %s not writable" % (dest))

md5sum = None
changed = False
if os.path.exists(dest):
    md5sum = os.popen("/usr/bin/md5sum %(file)s 2> /dev/null || /sbin/md5 -q %(file)s" % {"file": dest}).read().split()[0]

md5sum2 = os.popen("/usr/bin/md5sum %(file)s 2> /dev/null || /sbin/md5 -q %(file)s" % {"file": 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)
exit_kv(dest=dest, src=src, changed="md5sum=%s changed=%s" % (md5sum2, changed))