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270 lines
8.8 KiB
Python
270 lines
8.8 KiB
Python
# This code is part of Ansible, but is an independent component.
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# This particular file snippet, and this file snippet only, is BSD licensed.
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# Modules you write using this snippet, which is embedded dynamically by Ansible
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# still belong to the author of the module, and may assign their own license
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# to the complete work.
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#
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# Copyright (c) Ansible Inc, 2016
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without modification,
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# are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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import glob
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import os
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import pickle
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import platform
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import select
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import shlex
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import subprocess
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import traceback
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from ansible.module_utils.six import PY2, b
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from ansible.module_utils._text import to_bytes, to_text
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def sysv_is_enabled(name, runlevel=None):
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'''
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This function will check if the service name supplied
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is enabled in any of the sysv runlevels
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:arg name: name of the service to test for
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:kw runlevel: runlevel to check (default: None)
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'''
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if runlevel:
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return bool(glob.glob('/etc/rc%s.d/S??%s' % (runlevel, name)))
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else:
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return bool(glob.glob('/etc/rc?.d/S??%s' % name))
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def get_sysv_script(name):
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'''
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This function will return the expected path for an init script
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corresponding to the service name supplied.
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:arg name: name or path of the service to test for
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'''
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if name.startswith('/'):
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result = name
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else:
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result = '/etc/init.d/%s' % name
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return result
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def sysv_exists(name):
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'''
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This function will return True or False depending on
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the existence of an init script corresponding to the service name supplied.
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:arg name: name of the service to test for
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'''
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return os.path.exists(get_sysv_script(name))
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def get_ps(module, pattern):
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'''
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Last resort to find a service by trying to match pattern to programs in memory
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'''
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found = False
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if platform.system() == 'SunOS':
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flags = '-ef'
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else:
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flags = 'auxww'
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psbin = module.get_bin_path('ps', True)
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(rc, psout, pserr) = module.run_command([psbin, flags])
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if rc == 0:
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for line in psout.splitlines():
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if pattern in line:
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# FIXME: should add logic to prevent matching 'self', though that should be extreemly rare
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found = True
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break
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return found
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def fail_if_missing(module, found, service, msg=''):
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'''
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This function will return an error or exit gracefully depending on check mode status
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and if the service is missing or not.
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:arg module: is an AnsibleModule object, used for it's utility methods
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:arg found: boolean indicating if services was found or not
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:arg service: name of service
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:kw msg: extra info to append to error/success msg when missing
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'''
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if not found:
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if module.check_mode:
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module.exit_json(msg="Service %s not found on %s, assuming it will exist on full run" % (service, msg), changed=True)
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else:
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module.fail_json(msg='Could not find the requested service %s: %s' % (service, msg))
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def fork_process():
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'''
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This function performs the double fork process to detach from the
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parent process and execute.
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'''
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pid = os.fork()
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if pid == 0:
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# Set stdin/stdout/stderr to /dev/null
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fd = os.open(os.devnull, os.O_RDWR)
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# clone stdin/out/err
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for num in range(3):
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if fd != num:
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os.dup2(fd, num)
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# close otherwise
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if fd not in range(3):
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os.close(fd)
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# Make us a daemon
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pid = os.fork()
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# end if not in child
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if pid > 0:
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os._exit(0)
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# get new process session and detach
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sid = os.setsid()
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if sid == -1:
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raise Exception("Unable to detach session while daemonizing")
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# avoid possible problems with cwd being removed
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os.chdir("/")
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pid = os.fork()
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if pid > 0:
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os._exit(0)
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return pid
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def daemonize(module, cmd):
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'''
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Execute a command while detaching as a daemon, returns rc, stdout, and stderr.
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:arg module: is an AnsibleModule object, used for it's utility methods
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:arg cmd: is a list or string representing the command and options to run
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This is complex because daemonization is hard for people.
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What we do is daemonize a part of this module, the daemon runs the command,
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picks up the return code and output, and returns it to the main process.
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'''
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# init some vars
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chunk = 4096 # FIXME: pass in as arg?
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errors = 'surrogate_or_strict'
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# start it!
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try:
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pipe = os.pipe()
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pid = fork_process()
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except OSError:
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module.fail_json(msg="Error while attempting to fork: %s", exception=traceback.format_exc())
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except Exception as exc:
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module.fail_json(msg=to_text(exc), exception=traceback.format_exc())
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# we don't do any locking as this should be a unique module/process
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if pid == 0:
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os.close(pipe[0])
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# if command is string deal with py2 vs py3 conversions for shlex
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if not isinstance(cmd, list):
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if PY2:
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cmd = shlex.split(to_bytes(cmd, errors=errors))
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else:
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cmd = shlex.split(to_text(cmd, errors=errors))
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# make sure we always use byte strings
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run_cmd = []
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for c in cmd:
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run_cmd.append(to_bytes(c, errors=errors))
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# execute the command in forked process
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p = subprocess.Popen(run_cmd, shell=False, stdout=subprocess.PIPE, stderr=subprocess.PIPE, preexec_fn=lambda: os.close(pipe[1]))
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fds = [p.stdout, p.stderr]
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# loop reading output till its done
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output = {p.stdout: b(""), p.sterr: b("")}
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while fds:
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rfd, wfd, efd = select.select(fds, [], fds, 1)
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if (rfd + wfd + efd) or p.poll():
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for out in fds:
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if out in rfd:
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data = os.read(out.fileno(), chunk)
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if not data:
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fds.remove(out)
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output[out] += b(data)
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# even after fds close, we might want to wait for pid to die
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p.wait()
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# Return a pickled data of parent
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return_data = pickle.dumps([p.returncode, to_text(output[p.stdout]), to_text(output[p.stderr])], protocol=pickle.HIGHEST_PROTOCOL)
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os.write(pipe[1], to_bytes(return_data, errors=errors))
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# clean up
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os.close(pipe[1])
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os._exit(0)
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elif pid == -1:
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module.fail_json(msg="Unable to fork, no exception thrown, probably due to lack of resources, check logs.")
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else:
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# in parent
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os.close(pipe[1])
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os.waitpid(pid, 0)
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# Grab response data after child finishes
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return_data = b("")
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while True:
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rfd, wfd, efd = select.select([pipe[0]], [], [pipe[0]])
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if pipe[0] in rfd:
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data = os.read(pipe[0], chunk)
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if not data:
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break
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return_data += b(data)
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# Note: no need to specify encoding on py3 as this module sends the
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# pickle to itself (thus same python interpreter so we aren't mixing
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# py2 and py3)
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return pickle.loads(to_bytes(return_data, errors=errors))
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def check_ps(module, pattern):
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# Set ps flags
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if platform.system() == 'SunOS':
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psflags = '-ef'
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else:
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psflags = 'auxww'
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# Find ps binary
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psbin = module.get_bin_path('ps', True)
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(rc, out, err) = module.run_command('%s %s' % (psbin, psflags))
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# If rc is 0, set running as appropriate
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if rc == 0:
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for line in out.split('\n'):
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if pattern in line:
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return True
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return False
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