Current File : //usr/lib/python2.7/site-packages/salt/utils/minion.py
# -*- coding: utf-8 -*-
'''
Utility functions for minions
'''
# Import Python Libs
from __future__ import absolute_import, unicode_literals
import os
import logging
import threading
# Import Salt Libs
import salt.payload
import salt.utils.files
import salt.utils.platform
import salt.utils.process
log = logging.getLogger(__name__)
def running(opts):
'''
Return the running jobs on this minion
'''
ret = []
proc_dir = os.path.join(opts['cachedir'], 'proc')
if not os.path.isdir(proc_dir):
return ret
for fn_ in os.listdir(proc_dir):
path = os.path.join(proc_dir, fn_)
try:
data = _read_proc_file(path, opts)
if data is not None:
ret.append(data)
except (IOError, OSError):
# proc files may be removed at any time during this process by
# the minion process that is executing the JID in question, so
# we must ignore ENOENT during this process
pass
return ret
def cache_jobs(opts, jid, ret):
'''
Write job information to cache
'''
serial = salt.payload.Serial(opts=opts)
fn_ = os.path.join(
opts['cachedir'],
'minion_jobs',
jid,
'return.p')
jdir = os.path.dirname(fn_)
if not os.path.isdir(jdir):
os.makedirs(jdir)
with salt.utils.files.fopen(fn_, 'w+b') as fp_:
fp_.write(serial.dumps(ret))
def _read_proc_file(path, opts):
'''
Return a dict of JID metadata, or None
'''
serial = salt.payload.Serial(opts)
current_thread = threading.currentThread().name
pid = os.getpid()
with salt.utils.files.fopen(path, 'rb') as fp_:
buf = fp_.read()
fp_.close()
if buf:
data = serial.loads(buf)
else:
# Proc file is empty, remove
try:
os.remove(path)
except IOError:
log.debug('Unable to remove proc file %s.', path)
return None
if not isinstance(data, dict):
# Invalid serial object
return None
if not salt.utils.process.os_is_running(data['pid']):
# The process is no longer running, clear out the file and
# continue
try:
os.remove(path)
except IOError:
log.debug('Unable to remove proc file %s.', path)
return None
if opts.get('multiprocessing'):
if data.get('pid') == pid:
return None
else:
if data.get('pid') != pid:
try:
os.remove(path)
except IOError:
log.debug('Unable to remove proc file %s.', path)
return None
if data.get('jid') == current_thread:
return None
if not data.get('jid') in [x.name for x in threading.enumerate()]:
try:
os.remove(path)
except IOError:
log.debug('Unable to remove proc file %s.', path)
return None
if not _check_cmdline(data):
pid = data.get('pid')
if pid:
log.warning(
'PID %s exists but does not appear to be a salt process.', pid
)
try:
os.remove(path)
except IOError:
log.debug('Unable to remove proc file %s.', path)
return None
return data
def _check_cmdline(data):
'''
In some cases where there are an insane number of processes being created
on a system a PID can get recycled or assigned to a non-Salt process.
On Linux this fn checks to make sure the PID we are checking on is actually
a Salt process.
For non-Linux systems we punt and just return True
'''
if not salt.utils.platform.is_linux():
return True
pid = data.get('pid')
if not pid:
return False
if not os.path.isdir('/proc'):
return True
path = os.path.join('/proc/{0}/cmdline'.format(pid))
if not os.path.isfile(path):
return False
try:
with salt.utils.files.fopen(path, 'rb') as fp_:
if b'salt' in fp_.read():
return True
except (OSError, IOError):
return False
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