#!/usr/bin/python
# -*- coding: utf-8 -*-
# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>, and others
#
# 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 sys
import datetime
import traceback
import re
import shlex
import os
DOCUMENTATION = '''
---
module: command
short_description: Executes a command on a remote node
description:
- The M(command) module takes the command name followed by a list of space-delimited arguments.
- The given command will be executed on all selected nodes. It will not be
processed through the shell, so variables like C($HOME) and operations
like C("<"), C(">"), C("|"), and C("&") will not work. As such, all
paths to commands must be fully qualified
options:
free_form:
description:
- the command module takes a free form command to run
required: true
default: null
aliases: []
creates:
description:
- a filename, when it already exists, this step will B(not) be run.
required: no
default: null
removes:
description:
- a filename, when it does not exist, this step will B(not) be run.
version_added: "0.8"
required: no
default: null
chdir:
description:
- cd into this directory before running the command
version_added: "0.6"
required: false
default: null
executable:
description:
- change the shell used to execute the command. Should be an absolute path to the executable.
required: false
default: null
version_added: "0.9"
examples:
- code: "command: /sbin/shutdown -t now"
description: "Example from Ansible Playbooks"
- code: "command: /usr/bin/make_database.sh arg1 arg2 creates=/path/to/database"
description: "C(creates), C(removes), and C(chdir) can be specified after the command. For instance, if you only want to run a command if a certain file does not exist, use this."
notes:
- If you want to run a command through the shell (say you are using C(<),
C(>), C(|), etc), you actually want the M(shell) module instead. The
M(command) module is much more secure as it's not affected by the user's
environment.
author: Michael DeHaan
'''
def main():
# the command module is the one ansible module that does not take key=value args
# hence don't copy this one if you are looking to build others!
module = CommandModule(argument_spec=dict())
shell = module.params['shell']
chdir = module.params['chdir']
executable = module.params['executable']
args = module.params['args']
creates = module.params['creates']
removes = module.params['removes']
if args.strip() == '':
module.fail_json(rc=256, msg="no command given")
if chdir:
os.chdir(os.path.expanduser(chdir))
if creates:
# do not run the command if the line contains creates=filename
# and the filename already exists. This allows idempotence
# of command executions.
v = os.path.expanduser(creates)
if os.path.exists(v):
module.exit_json(
cmd=args,
stdout="skipped, since %s exists" % v,
skipped=True,
changed=False,
stderr=False,
rc=0
)
if removes:
# do not run the command if the line contains removes=filename
# and the filename does not exist. This allows idempotence
# of command executions.
v = os.path.expanduser(removes)
if not os.path.exists(v):
module.exit_json(
cmd=args,
stdout="skipped, since %s does not exist" % v,
skipped=True,
changed=False,
stderr=False,
rc=0
)
if not shell:
args = shlex.split(args)
startd = datetime.datetime.now()
rc, out, err = module.run_command(args, executable=executable)
endd = datetime.datetime.now()
delta = endd - startd
if out is None:
out = ''
if err is None:
err = ''
module.exit_json(
cmd = args,
stdout = out.rstrip("\r\n"),
stderr = err.rstrip("\r\n"),
rc = rc,
start = str(startd),
end = str(endd),
delta = str(delta),
changed = True
)
# include magic from lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
# only the command module should ever need to do this
# everything else should be simple key=value
class CommandModule(AnsibleModule):
def _handle_aliases(self):
return {}
def _check_invalid_arguments(self):
pass
def _load_params(self):
''' read the input and return a dictionary and the arguments string '''
args = MODULE_ARGS
params = {}
params['chdir'] = None
params['creates'] = None
params['removes'] = None
params['shell'] = False
params['executable'] = None
if args.find("#USE_SHELL") != -1:
args = args.replace("#USE_SHELL", "")
params['shell'] = True
r = re.compile(r'(^|\s)(creates|removes|chdir|executable)=(?P<quote>[\'"])?(.*?)(?(quote)(?<!\\)(?P=quote))((?<!\\)(?=\s)|$)')
for m in r.finditer(args):
v = m.group(4).replace("\\", "")
if m.group(2) == "creates":
params['creates'] = v
elif m.group(2) == "removes":
params['removes'] = v
elif m.group(2) == "chdir":
v = os.path.expanduser(v)
if not (os.path.exists(v) and os.path.isdir(v)):
self.fail_json(rc=258, msg="cannot change to directory '%s': path does not exist" % v)
elif v[0] != os.sep:
self.fail_json(rc=259, msg="the path for 'chdir' argument must be fully qualified")
params['chdir'] = v
elif m.group(2) == "executable":
v = os.path.expanduser(v)
if not (os.path.exists(v)):
self.fail_json(rc=258, msg="cannot use executable '%s': file does not exist" % v)
elif v[0] != '/':
self.fail_json(rc=259, msg="the path for 'executable' argument must be fully qualified")
params['executable'] = v
args = r.sub("", args)
params['args'] = args
return (params, params['args'])
main()