ansible/library/assemble

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# (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/>.
import os
import os.path
import shutil
import tempfile
DOCUMENTATION = '''
---
module: assemble
short_description: Assembles a configuration file from fragments
description:
- Assembles a configuration file from fragments. Often a particular
program will take a single configuration file and does not support a
C(conf.d) style structure where it is easy to build up the configuration
from multiple sources. Assemble will take a directory of files that have
already been transferred to the system, and concatenate them together to
produce a destination file. Files are assembled in string sorting order.
Puppet calls this idea I(fragments).
version_added: "0.5"
options:
src:
description:
- An already existing directory full of source files.
required: true
default: null
aliases: []
dest:
description:
- A file to create using the concatenation of all of the source files.
required: true
default: null
backup:
description:
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- Create a backup file (if C(yes)), including the timestamp information so
you can get the original file back if you somehow clobbered it
incorrectly.
required: false
choices: [ "yes", "no" ]
default: "no"
others:
description:
- all arguments accepted by the M(file) module also work here
required: false
examples:
- code: "assemble: src=/etc/someapp/fragments dest=/etc/someapp/someapp.conf"
description: "Example from Ansible Playbooks"
author: Stephen Fromm
'''
# ===========================================
# Support methods
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
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# ==============================================================
# main
def main():
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module = AnsibleModule(
# not checking because of daisy chain to file module
check_invalid_arguments = False,
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argument_spec = dict(
src = dict(required=True),
dest = dict(required=True),
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backup=dict(default=False, choices=BOOLEANS),
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)
)
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changed=False
pathmd5 = None
destmd5 = None
src = os.path.expanduser(module.params['src'])
dest = os.path.expanduser(module.params['dest'])
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backup = module.boolean(module.params.get('backup', False))
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if not os.path.exists(src):
module.fail_json(msg="Source (%s) does not exist" % src)
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if not os.path.isdir(src):
module.fail_json(msg="Source (%s) is not a directory" % src)
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path = write_temp_file(assemble_from_fragments(src))
pathmd5 = module.md5(path)
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if os.path.exists(dest):
destmd5 = module.md5(dest)
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if pathmd5 != destmd5:
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if backup and destmd5 is not None:
module.backup_local(dest)
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shutil.copy(path, dest)
changed = True
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# Mission complete
module.exit_json(src=src, dest=dest, md5sum=destmd5,
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changed=changed, msg="OK",
daisychain="file", daisychain_args=module.params)
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()