Current File : //usr/lib/python2.7/site-packages/salt/utils/systemd.py
# -*- coding: utf-8 -*-
'''
Contains systemd related help files
'''
# import python libs
from __future__ import absolute_import, print_function, unicode_literals
import logging
import os
import re
import subprocess
# Import Salt libs
from salt.exceptions import SaltInvocationError
import salt.utils.stringutils
log = logging.getLogger(__name__)
def booted(context=None):
'''
Return True if the system was booted with systemd, False otherwise. If the
loader context dict ``__context__`` is passed, this function will set the
``salt.utils.systemd.booted`` key to represent if systemd is running and
keep the logic below from needing to be run again during the same salt run.
'''
contextkey = 'salt.utils.systemd.booted'
if isinstance(context, dict):
# Can't put this if block on the same line as the above if block,
# because it willl break the elif below.
if contextkey in context:
return context[contextkey]
elif context is not None:
raise SaltInvocationError('context must be a dictionary if passed')
try:
# This check does the same as sd_booted() from libsystemd-daemon:
# http://www.freedesktop.org/software/systemd/man/sd_booted.html
ret = bool(os.stat('/run/systemd/system'))
except OSError:
ret = False
try:
context[contextkey] = ret
except TypeError:
pass
return ret
def version(context=None):
'''
Attempts to run systemctl --version. Returns None if unable to determine
version.
'''
contextkey = 'salt.utils.systemd.version'
if isinstance(context, dict):
# Can't put this if block on the same line as the above if block,
# because it will break the elif below.
if contextkey in context:
return context[contextkey]
elif context is not None:
raise SaltInvocationError('context must be a dictionary if passed')
stdout = subprocess.Popen(
['systemctl', '--version'],
close_fds=True,
stdout=subprocess.PIPE, stderr=subprocess.STDOUT).communicate()[0]
outstr = salt.utils.stringutils.to_str(stdout)
try:
ret = int(re.search(r'\w+ ([0-9]+)', outstr.splitlines()[0]).group(1))
except (AttributeError, IndexError, ValueError):
log.error(
'Unable to determine systemd version from systemctl '
'--version, output follows:\n%s', outstr
)
return None
else:
try:
context[contextkey] = ret
except TypeError:
pass
return ret
def has_scope(context=None):
'''
Scopes were introduced in systemd 205, this function returns a boolean
which is true when the minion is systemd-booted and running systemd>=205.
'''
if not booted(context):
return False
_sd_version = version(context)
if _sd_version is None:
return False
return _sd_version >= 205
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