ansible/library/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/>.
import os
import sys
import shlex
import subprocess
import shutil
import stat
import grp
import pwd
import syslog
try:
import selinux
HAVE_SELINUX=True
except ImportError:
HAVE_SELINUX=False
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def dump_kv(vars):
return " ".join("%s='%s'" % (k,v) for (k,v) in vars.items())
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def exit_kv(rc=0, **kwargs):
if 'path' in kwargs:
add_path_info(kwargs)
print dump_kv(kwargs)
sys.exit(rc)
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def fail_kv(**kwargs):
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kwargs['failed'] = True
exit_kv(rc=1, **kwargs)
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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'] = oct(stat.S_IMODE(st[stat.ST_MODE]))
# secontext not yet supported
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if os.path.islink(path):
kwargs['state'] = 'link'
elif os.path.isfile(path):
kwargs['state'] = 'file'
else:
kwargs['state'] = 'directory'
if HAVE_SELINUX and selinux_enabled():
kwargs['secontext'] = ':'.join(selinux_context(path))
else:
kwargs['state'] = 'absent'
return 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:
fail_kv(path=path, msg='failed to retrieve selinux context')
if ret[0] == -1:
return context
context = ret[1].split(':')
return context
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# ===========================================
argfile = sys.argv[1]
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)
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if not len(items):
fail_kv(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)))
if path:
path = os.path.expanduser(path)
src = params.get('src', None)
if src:
src = os.path.expanduser(src)
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dest = params.get('dest', None)
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mode = params.get('mode', None)
owner = params.get('owner', None)
group = params.get('group', None)
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# 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)
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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]
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if state not in [ 'file', 'directory', 'link', 'absent']:
fail_kv(msg='invalid state: %s' % state)
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if state == 'link' and (src is None or dest is None):
fail_kv(msg='src and dest are required for "link" state')
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elif path is None:
fail_kv(msg='path is required')
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changed = False
# ===========================================
# support functions
def user_and_group(filename):
st = os.stat(filename)
uid = st.st_uid
gid = st.st_gid
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try:
user = pwd.getpwuid(uid)[0]
except KeyError:
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user = str(uid)
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try:
group = grp.getgrgid(gid)[0]
except KeyError:
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group = str(gid)
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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:
fail_kv(path=path, msg='invalid selinux context')
if rc != 0:
fail_kv(path=path, msg='set selinux context failed')
changed = True
return changed
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def set_owner_if_different(path, owner, changed):
if owner is None:
return changed
user, group = user_and_group(path)
if owner != user:
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rc = os.system("/bin/chown -R %s %s 2>/dev/null" % (owner, path))
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if rc != 0:
fail_kv(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:
return changed
old_user, old_group = user_and_group(path)
if old_group != group:
rc = os.system("/bin/chgrp -R %s %s" % (group, path))
if rc != 0:
fail_kv(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:
return changed
try:
# FIXME: support English modes
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mode = int(mode, 8)
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except Exception, e:
fail_kv(path=path, msg='mode needs to be something octalish', details=str(e))
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st = os.stat(path)
prev_mode = stat.S_IMODE(st[stat.ST_MODE])
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if prev_mode != mode:
# FIXME: comparison against string above will cause this to be executed
# every time
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try:
os.chmod(path, mode)
except Exception, e:
fail_kv(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
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return changed
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def rmtree_error(func, path, exc_info):
fail_kv(path=path, msg='failed to remove directory')
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# ===========================================
# go...
prev_state = 'absent'
if os.path.lexists(path):
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if os.path.islink(path):
prev_state = 'link'
elif os.path.isfile(path):
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prev_state = 'file'
else:
prev_state = 'directory'
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:
fail_kv(path=path, msg=str(e))
exit_kv(path=path, changed=True)
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sys.exit(0)
if prev_state != 'absent' and prev_state != state:
fail_kv(path=path, msg='refusing to convert between %s and %s' % (prev_state, state))
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if prev_state == 'absent' and state == 'absent':
exit_kv(path=path, changed=False)
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if state == 'file':
if prev_state == 'absent':
fail_kv(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_kv(path=path, changed=changed)
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elif state == '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, group, changed)
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changed = set_mode_if_different(path, mode, changed)
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exit_kv(path=path, changed=changed)
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elif state == 'link':
if os.path.isabs(src):
abs_src = src
else:
abs_src = os.path.join(os.path.dirname(dest), src)
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if not os.path.exists(abs_src):
fail_kv(dest=dest, src=src, msg='src file does not exist')
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if prev_state == 'absent':
os.symlink(src, dest)
changed = True
elif prev_state == 'link':
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old_src = os.readlink(dest)
if not os.path.isabs(old_src):
old_src = os.path.join(os.path.dirname(dest), old_src)
if old_src != src:
os.unlink(dest)
os.symlink(src, dest)
else:
fail_kv(dest=dest, src=src, msg='unexpected position reached')
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# set modes owners and context as needed
changed = set_context_if_different(dest, secontext, changed)
changed = set_owner_if_different(dest, owner, changed)
changed = set_group_if_different(dest, group, changed)
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changed = set_mode_if_different(dest, mode, changed)
exit_kv(dest=dest, src=src, changed=changed)
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fail_kv(path=path, msg='unexpected position reached')
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sys.exit(0)