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community.general/library/file
Michael DeHaan e170d7304b Added documentation on file force parameter
2012-10-03 20:57:36 -04:00

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# (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 shutil
import stat
import grp
import pwd
try:
import selinux
HAVE_SELINUX=True
except ImportError:
HAVE_SELINUX=False
DOCUMENTATION = '''
---
module: file
short_description: Sets attributes of files
description:
- Sets attributes of files, symlinks, and directories, or removes
files/symlinks/directories. Many other modules support the same options as
the file module - including M(copy), M(template), and M(assmeble).
options:
dest:
description:
- defines the file being managed, unless when used with I(state=link), and then sets the destination to create a symbolic link to using I(src)
required: true
default: []
aliases: []
state:
description:
- If C(directory), all immediate subdirectories will be created if they
do not exist. If C(file), the file will NOT be created if it does not
exist, see the M(copy) or M(template) module if you want that behavior.
If C(link), the symbolic link will be created or changed. If C(absent),
directories will be recursively deleted, and files or symlinks will be
unlinked.
required: false
default: file
choices: [ file, link, directory, absent ]
mode:
required: false
default: null
choices: []
description:
- mode the file or directory should be, such as 0644 as would be fed to
owner:
required: false
default: null
choices: []
description:
- name of the user that should own the file/directory, as would be fed to I(chown)
group:
required: false
default: null
choices: []
description:
- name of the group that should own the file/directory, as would be fed to I(chown)
src:
required: false
default: null
choices: []
description:
- path of the file to link to (applies only to C(state=link)).
seuser:
required: false
default: null
choices: []
description:
- user part of SELinux file context. Will default to system policy, if
applicable. If set to C(_default), it will use the C(user) portion of the
the policy if available
serole:
required: false
default: null
choices: []
description:
- role part of SELinux file context, C(_default) feature works as for I(seuser).
setype:
required: false
default: null
choices: []
description:
- type part of SELinux file context, C(_default) feature works as for I(seuser).
selevel:
required: false
default: "s0"
choices: []
description:
- level part of the SELinux file context. This is the MLS/MCS attribute,
sometimes known as the C(range). C(_default) feature works as for
I(seuser).
context:
required: false
default: null
choices: [ "default" ]
description:
- accepts only C(default) as value. This will restore a file's SELinux context
in the policy. Does nothing if no default value is available.
force:
required: false
default: null
choices: []
description:
- force is required when changing an existing file to a directory, or a link to a directory, and so on. Use this with caution.
examples:
- code: file path=/etc/foo.conf owner=foo group=foo mode=0644
description: Example from Ansible Playbooks
- code: file src=/file/to/link/to dest=/path/to/symlink owner=foo group=foo state=link
notes:
- See also M(copy), M(template), M(assemble)
requirements: [ ]
author: Michael DeHaan
'''
def add_path_info(kwargs):
path = kwargs['path']
if os.path.exists(path):
(user, group) = user_and_group(path)
kwargs['owner'] = user
kwargs['group'] = group
st = os.stat(path)
kwargs['mode'] = oct(stat.S_IMODE(st[stat.ST_MODE]))
# secontext not yet supported
if os.path.islink(path):
kwargs['state'] = 'link'
elif os.path.isdir(path):
kwargs['state'] = 'directory'
else:
kwargs['state'] = 'file'
if HAVE_SELINUX and selinux_enabled():
kwargs['secontext'] = ':'.join(selinux_context(path))
else:
kwargs['state'] = 'absent'
return kwargs
def module_exit_json(**kwargs):
add_path_info(kwargs)
module.exit_json(**kwargs)
def module_fail_json(**kwargs):
add_path_info(kwargs)
module.fail_json(**kwargs)
# Detect whether using selinux that is MLS-aware.
# While this means you can set the level/range with
# selinux.lsetfilecon(), it may or may not mean that you
# will get the selevel as part of the context returned
# by selinux.lgetfilecon().
def selinux_mls_enabled():
if not HAVE_SELINUX:
return False
if selinux.is_selinux_mls_enabled() == 1:
return True
else:
return False
def selinux_enabled():
if not HAVE_SELINUX:
return False
if selinux.is_selinux_enabled() == 1:
return True
else:
return False
# Determine whether we need a placeholder for selevel/mls
def selinux_initial_context():
context = [None, None, None]
if selinux_mls_enabled():
context.append(None)
return context
# If selinux fails to find a default, return an array of None
def selinux_default_context(path, mode=0):
context = selinux_initial_context()
if not HAVE_SELINUX or not selinux_enabled():
return context
try:
ret = selinux.matchpathcon(path, mode)
except OSError:
return context
if ret[0] == -1:
return context
context = ret[1].split(':')
return context
def selinux_context(path):
context = selinux_initial_context()
if not HAVE_SELINUX or not selinux_enabled():
return context
try:
ret = selinux.lgetfilecon(path)
except:
module_fail_json(path=path, msg='failed to retrieve selinux context')
if ret[0] == -1:
return context
context = ret[1].split(':')
return context
# ===========================================
# support functions
def user_and_group(filename):
st = os.stat(filename)
uid = st.st_uid
gid = st.st_gid
try:
user = pwd.getpwuid(uid)[0]
except KeyError:
user = str(uid)
try:
group = grp.getgrgid(gid)[0]
except KeyError:
group = str(gid)
return (user, group)
def set_context_if_different(path, context, changed):
if not HAVE_SELINUX or not selinux_enabled():
return changed
cur_context = selinux_context(path)
new_context = list(cur_context)
# Iterate over the current context instead of the
# argument context, which may have selevel.
for i in range(len(cur_context)):
if context[i] is not None and context[i] != cur_context[i]:
new_context[i] = context[i]
if cur_context != new_context:
try:
rc = selinux.lsetfilecon(path, ':'.join(new_context))
except OSError:
module_fail_json(path=path, msg='invalid selinux context')
if rc != 0:
module_fail_json(path=path, msg='set selinux context failed')
changed = True
return changed
def set_owner_if_different(path, owner, changed):
if owner is None:
return changed
user, group = user_and_group(path)
if owner != user:
try:
uid = pwd.getpwnam(owner).pw_uid
except KeyError:
module_fail_json(path=path, msg='chown failed: failed to look up user %s' % owner)
try:
os.chown(path, uid, -1)
except OSError:
module_fail_json(path=path, msg='chown failed')
return True
return changed
def set_group_if_different(path, group, changed):
if group is None:
return changed
old_user, old_group = user_and_group(path)
if old_group != group:
try:
gid = grp.getgrnam(group).gr_gid
except KeyError:
module_fail_json(path=path, msg='chgrp failed: failed to look up group %s' % group)
try:
os.chown(path, -1, gid)
except OSError:
module_fail_json(path=path, msg='chgrp failed')
return True
return changed
def set_mode_if_different(path, mode, changed):
if mode is None:
return changed
try:
# FIXME: support English modes
mode = int(mode, 8)
except Exception, e:
module_fail_json(path=path, msg='mode needs to be something octalish', details=str(e))
st = os.stat(path)
prev_mode = stat.S_IMODE(st[stat.ST_MODE])
if prev_mode != mode:
# FIXME: comparison against string above will cause this to be executed
# every time
try:
os.chmod(path, mode)
except Exception, e:
module_fail_json(path=path, msg='chmod failed', details=str(e))
st = os.stat(path)
new_mode = stat.S_IMODE(st[stat.ST_MODE])
if new_mode != prev_mode:
return True
return changed
def rmtree_error(func, path, exc_info):
module_fail_json(path=path, msg='failed to remove directory')
def main():
# FIXME: pass this around, should not use global
global module
module = AnsibleModule(
check_invalid_arguments = False,
argument_spec = dict(
state = dict(choices=['file','directory','link','absent'], default='file'),
path = dict(aliases=['dest', 'name'], required=True),
src = dict(),
force = dict(default='no', choices=['yes', 'no']),
mode = dict(),
owner = dict(),
group = dict(),
seuser = dict(),
serole = dict(),
selevel = dict(),
setype = dict(),
)
)
params = module.params
state = params['state']
path = os.path.expanduser(params['path'])
src = params.get('src', None)
if src:
src = os.path.expanduser(src)
force = module.boolean(params['force'])
mode = params.get('mode', None)
owner = params.get('owner', None)
group = params.get('group', None)
# selinux related options
seuser = params.get('seuser', None)
serole = params.get('serole', None)
setype = params.get('setype', None)
selevel = params.get('serange', 's0')
secontext = [seuser, serole, setype]
if selinux_mls_enabled():
secontext.append(selevel)
default_secontext = selinux_default_context(path)
for i in range(len(default_secontext)):
if i is not None and secontext[i] == '_default':
secontext[i] = default_secontext[i]
if state == 'link' and (src is None or path is None):
module_fail_json(msg='src and dest are required for "link" state')
elif path is None:
module_fail_json(msg='path is required')
changed = False
prev_state = 'absent'
if os.path.lexists(path):
if os.path.islink(path):
prev_state = 'link'
elif os.path.isdir(path):
prev_state = 'directory'
else:
prev_state = 'file'
if prev_state != 'absent' and state == '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:
module_fail_json(path=path, msg=str(e))
module_exit_json(path=path, changed=True)
if prev_state != 'absent' and prev_state != state and not force:
module_fail_json(path=path, msg='refusing to convert between %s and %s' % (prev_state, state))
if prev_state == 'absent' and state == 'absent':
module_exit_json(path=path, changed=False)
if state == 'file':
if prev_state != 'file':
module_fail_json(path=path, msg='file does not exist, use copy or template module to create')
# 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)
module_exit_json(path=path, changed=changed)
elif state == 'directory':
if prev_state == 'absent':
os.makedirs(path)
changed = True
elif prev_state != 'directory' and force:
try:
os.unlink(path)
except Exception, e:
module_fail_json(path=path, msg=str(e))
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, group, changed)
changed = set_mode_if_different(path, mode, changed)
module_exit_json(path=path, changed=changed)
elif state == 'link':
if os.path.isabs(src):
abs_src = src
else:
module.fail_json(msg="absolute paths are required")
if not os.path.exists(abs_src):
module_fail_json(path=path, src=src, msg='src file does not exist')
if prev_state == 'absent':
os.symlink(src, path)
changed = True
elif prev_state != 'link' and force:
try:
if os.path.isfile(path):
os.unlink(path)
else:
shutil.rmtree(path, ignore_errors=False, onerror=rmtree_error)
except Exception, e:
module_fail_json(path=path, msg=str(e))
os.symlink(src, path)
changed = True
elif prev_state == 'link':
old_src = os.readlink(path)
if not os.path.isabs(old_src):
old_src = os.path.join(os.path.dirname(path), old_src)
if old_src != src:
os.unlink(path)
os.symlink(src, path)
changed = True
else:
module_fail_json(dest=path, src=src, msg='unexpected position reached')
# 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)
module.exit_json(dest=path, src=src, changed=changed)
module_fail_json(path=path, msg='unexpected position reached')
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()
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