ansible/file

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#!/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/>.
try:
import json
except ImportError:
import simplejson as json
import os
import sys
import shlex
import subprocess
import shutil
import stat
import grp
import pwd
def debug(msg):
# ansible ignores stderr, so it's safe to use for debug
print >>sys.stderr, msg
def exit_json(rc=0, **kwargs):
# FIXME: if path exists, include the user, group, mode and context
# in the data if not already present, such that this module is
# also useful for inventory purposes
if 'path' in kwargs:
debug("adding path info")
add_path_info(kwargs)
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print json.dumps(kwargs)
sys.exit(rc)
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def fail_json(**kwargs):
kwargs['failed'] = True
exit_json(rc=1, **kwargs)
def add_path_info(kwargs):
path = kwargs['path']
if os.path.exists(path):
(user, group) = user_and_group(path)
kwargs['user'] = user
kwargs['group'] = group
st = os.stat(path)
kwargs['mode'] = stat.S_IMODE(st[stat.ST_MODE])
# secontext not yet supported
if os.path.isfile(path):
kwargs['state'] = 'file'
else:
kwargs['state'] = 'directory'
else:
kwargs['state'] = 'absent'
return kwargs
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# ===========================================
argfile = sys.argv[1]
args = open(argfile, 'r').read()
items = shlex.split(args)
if not len(items):
fail_json(msg='the module requires arguments -a')
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sys.exit(1)
params = {}
for x in items:
(k, v) = x.split("=")
params[k] = v
state = params.get('state','file')
path = params.get('path', params.get('dest', params.get('name', None)))
link = params.get('link', 'false')
mode = params.get('mode', None)
owner = params.get('owner', None)
group = params.get('group', None)
recurse = params.get('recurse', 'false')
secontext = params.get('secontext', None)
if state not in [ 'file', 'directory', 'absent' ]:
fail_json(msg='invalid state')
if path is None:
fail_json(msg='path is required')
changed = False
# ===========================================
# support functions
def md5sum(filename):
return os.popen("/usr/bin/md5sum %s" % f).read()
def user_and_group(filename):
st = os.stat(filename)
uid = st.st_uid
gid = st.st_gid
user = pwd.getpwuid(uid)[0]
group = grp.getgrgid(gid)[0]
debug("got user=%s and group=%s" % (user, group))
return (user, group)
def set_context_if_different(path, context, changed):
if context is None:
return changed
if context is not None:
fail_json(path=path, msg='context not yet supported')
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def set_owner_if_different(path, owner, changed):
if owner is None:
debug('not tweaking owner')
return changed
user, group = user_and_group(path)
if owner != user:
debug('setting owner')
rc = os.system("/bin/chown -R %s %s" % (owner, path))
if rc != 0:
fail_json(path=path, msg='chown failed')
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return True
return changed
def set_group_if_different(path, group, changed):
if group is None:
debug('not tweaking group')
return changed
old_user, old_group = user_and_group(path)
if old_group != group:
debug('setting group')
rc = os.system("/bin/chgrp -R %s %s" % (group, path))
if rc != 0:
fail_json(path=path, msg='chgrp failed')
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return True
return changed
def set_mode_if_different(path, mode, changed):
if mode is None:
debug('not tweaking mode')
return changed
try:
# FIXME: support English modes
mode = int("0%s" % mode)
except Exception, e:
fail_json(path=path, msg='mode needs to be something octalish', details=str(e))
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st = os.stat(path)
actual_mode = stat.S_IMODE(st[stat.ST_MODE])
if actual_mode != mode:
try:
debug('setting mode')
os.chmod(path, mode)
except Exception, e:
fail_json(path=path, msg='chmod failed', details=str(e))
if os.path.exists(path):
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return True
return changed
def rmtree_error(func, path, exc_info):
fail_json(path=path, msg='failed to remove directory')
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# ===========================================
# go...
prev_state = 'absent'
if os.path.exists(path):
if os.path.isfile(path):
prev_state = 'file'
else:
prev_state = 'directory'
if prev_state != 'absent' and state == 'absent':
debug('requesting absent')
try:
if prev_state == 'directory':
if os.path.islink(path):
os.unlink(path)
else:
shutil.rmtree(path, ignore_errors=False, onerror=rmtree_error)
else:
os.unlink(path)
except Exception, e:
fail_json(path=path, msg=str(e))
exit_json(path=path, changed=True)
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sys.exit(0)
if prev_state != 'absent' and prev_state != state:
fail_json(path=path, msg='refusing to convert between file and directory')
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if prev_state == 'absent' and state == 'absent':
exit_json(path=path, changed=False)
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if state == 'file':
debug('requesting file')
if prev_state == 'absent':
fail_json(path=path, msg='file does not exist, use copy or template module to create')
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# set modes owners and context as needed
changed = set_context_if_different(path, secontext, changed)
changed = set_owner_if_different(path, owner, changed)
changed = set_group_if_different(path, group, changed)
changed = set_mode_if_different(path, mode, changed)
exit_json(path=path, changed=changed)
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elif state == 'directory':
debug('requesting directory')
if prev_state == 'absent':
os.makedirs(path)
changed = True
# set modes owners and context as needed
changed = set_context_if_different(path, secontext, changed)
changed = set_owner_if_different(path, owner, changed)
changed = set_group_if_different(path, owner, changed)
changed = set_mode_if_different(path, owner, changed)
exit_json(path=path, changed=changed)
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fail_json(path=path, msg='unexpected position reached')
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sys.exit(0)