ansible/library/files/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
import re
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. M(assemble) will take a directory of files that can be
local or 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"
delimiter:
description:
- A delimiter to separate the file contents.
version_added: "1.4"
required: false
default: null
remote_src:
description:
- If False, it will search for src at originating/master machine, if True it will
go to the remote/target machine for the src. Default is True.
choices: [ "True", "False" ]
required: false
default: "True"
version_added: "1.4"
regexp:
description:
- Assemble files only if C(regex) matches the filename. If not set,
all files are assembled. All "\\" (backslash) must be escaped as
"\\\\" to comply yaml syntax. Uses Python regular expressions; see
U(http://docs.python.org/2/library/re.html).
required: false
default: null
others:
description:
- all arguments accepted by the M(file) module also work here
required: false
author: Stephen Fromm
'''
EXAMPLES = '''
# Example from Ansible Playbooks
- assemble: src=/etc/someapp/fragments dest=/etc/someapp/someapp.conf
# When a delimiter is specified, it will be inserted in between each fragment
- assemble: src=/etc/someapp/fragments dest=/etc/someapp/someapp.conf delimiter='### START FRAGMENT ###'
'''
# ===========================================
# Support method
def assemble_from_fragments(src_path, delimiter=None, compiled_regexp=None):
''' assemble a file from a directory of fragments '''
tmpfd, temp_path = tempfile.mkstemp()
tmp = os.fdopen(tmpfd,'w')
delimit_me = False
add_newline = False
for f in sorted(os.listdir(src_path)):
if compiled_regexp and not compiled_regexp.search(f):
continue
fragment = "%s/%s" % (src_path, f)
if not os.path.isfile(fragment):
continue
fragment_content = file(fragment).read()
# always put a newline between fragments if the previous fragment didn't end with a newline.
if add_newline:
tmp.write('\n')
# delimiters should only appear between fragments
if delimit_me:
if delimiter:
# un-escape anything like newlines
delimiter = delimiter.decode('unicode-escape')
tmp.write(delimiter)
# always make sure there's a newline after the
# delimiter, so lines don't run together
if delimiter[-1] != '\n':
tmp.write('\n')
tmp.write(fragment_content)
delimit_me = True
if fragment_content.endswith('\n'):
add_newline = False
else:
add_newline = True
tmp.close()
return temp_path
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# ==============================================================
# main
def main():
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module = AnsibleModule(
# not checking because of daisy chain to file module
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argument_spec = dict(
src = dict(required=True),
delimiter = dict(required=False),
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dest = dict(required=True),
backup=dict(default=False, type='bool'),
remote_src=dict(default=False, type='bool'),
regexp = dict(required=False),
),
add_file_common_args=True
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)
changed = False
pathmd5 = None
destmd5 = None
src = os.path.expanduser(module.params['src'])
dest = os.path.expanduser(module.params['dest'])
backup = module.params['backup']
delimiter = module.params['delimiter']
regexp = module.params['regexp']
compiled_regexp = None
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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)
if regexp != None:
try:
compiled_regexp = re.compile(regexp)
except re.error, e:
module.fail_json(msg="Invalid Regexp (%s) in \"%s\"" % (e, regexp))
path = assemble_from_fragments(src, delimiter, compiled_regexp)
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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
os.remove(path)
file_args = module.load_file_common_arguments(module.params)
changed = module.set_fs_attributes_if_different(file_args, changed)
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# Mission complete
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module.exit_json(src=src, dest=dest, md5sum=pathmd5, changed=changed, msg="OK")
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# import module snippets
from ansible.module_utils.basic import *
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main()