ansible/library/assemble

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#!/usr/bin/python
# (c) 2012, Stephen Fromm <sfromm@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/>.
try:
import json
except ImportError:
import simplejson as json
import os
import os.path
import sys
import shlex
import shutil
import syslog
import tempfile
try:
import hashlib
HAVE_HASHLIB=True
except ImportError:
import md5
HAVE_HASHLIB=False
# Since hashlib is only available in 2.5 and onwards, this module
# uses md5 which is available in 2.4.
# ===========================================
# Support methods
def exit_json(rc=0, **kwargs):
print json.dumps(kwargs)
sys.exit(rc)
def fail_json(**kwargs):
kwargs['failed'] = True
exit_json(rc=1, **kwargs)
def assemble_from_fragments(path):
''' assemble a file from a directory of fragments '''
assembled = []
for f in sorted(os.listdir(path)):
fragment = "%s/%s" % (path, f)
if os.path.isfile(fragment):
assembled.append(file(fragment).read())
return "".join(assembled)
def write_temp_file(data):
fd, path = tempfile.mkstemp()
os.write(fd, data)
os.close(fd)
return path
def file_digest(path):
if HAVE_HASHLIB:
digest = hashlib.md5(file(path).read()).hexdigest()
else:
digest = md5.new(file(path).read()).hexdigest()
return digest
# ===========================================
if len(sys.argv) == 1:
fail_json(msg="the assemble module requires arguments (-a)")
argfile = sys.argv[1]
if not os.path.exists(argfile):
fail_json(msg="Argument file not found")
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)
if not len(items):
fail_json(msg="the assemble module requires arguments (-a)")
params = {}
for x in items:
(k, v) = x.split("=")
params[k] = v
changed = False
pathmd5 = None
destmd5 = None
src = params.get('src', None)
dest = params.get('dest', None)
if src:
src = os.path.expanduser(src)
if dest:
dest = os.path.expanduser(dest)
if not os.path.exists(src):
fail_json(msg="Source (%s) does not exist" % src)
if not os.path.isdir(src):
fail_json(msg="Source (%s) is not a directory" % src)
path = write_temp_file(assemble_from_fragments(src))
pathmd5 = file_digest(path)
if os.path.exists(dest):
destmd5 = file_digest(dest)
if pathmd5 != destmd5:
shutil.copy(path, dest)
changed = True
exit_json(md5sum=pathmd5, changed=changed)