#!/usr/bin/env python # (c) 2012, Stephen Fromm # # 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 . # # ansible-pull is a script that runs ansible in local mode # after checking out a playbooks directory from source repo. There is an # example playbook to bootstrap this script in the examples/ dir which # installs ansible and sets it up to run on cron. # usage: # ansible-pull -d /var/lib/ansible \ # -U http://example.net/content.git [-C production] \ # [path/playbook.yml] # # the -d and -U arguments are required; the -C argument is optional. # # ansible-pull accepts an optional argument to specify a playbook # location underneath the workdir and then searches the source repo # for playbooks in the following order, stopping at the first match: # # 1. $workdir/path/playbook.yml, if specified # 2. $workdir/$hostname.yml # 3. $workdir/local.yml # # the source repo must contain at least one of these playbooks. import os import shutil import subprocess import sys import datetime import socket from ansible import utils DEFAULT_REPO_TYPE = 'git' DEFAULT_PLAYBOOK = 'local.yml' PLAYBOOK_ERRORS = {1: 'File does not exist', 2: 'File is not readable'} def _run(cmd): print >>sys.stderr, "Running: '%s'" % cmd cmd = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE) (out, err) = cmd.communicate() print out if cmd.returncode != 0: print >>sys.stderr, err return cmd.returncode, out def try_playbook(path): if not os.path.exists(path): return 1 if not os.access(path, os.R_OK): return 2 return 0 def select_playbook(path, args): playbook = None if len(args) > 0 and args[0] is not None: playbook = "%s/%s" % (path, args[0]) rc = try_playbook(playbook) if rc != 0: print >>sys.stderr, "%s: %s" % (playbook, PLAYBOOK_ERRORS[rc]) return None return playbook else: hostpb = "%s/%s.yml" % (path, socket.getfqdn()) localpb = "%s/%s" % (path, DEFAULT_PLAYBOOK) errors = [] for pb in [hostpb, localpb]: rc = try_playbook(pb) if rc == 0: playbook = pb break else: errors.append("%s: %s" % (pb, PLAYBOOK_ERRORS[rc])) if playbook is None: print >>sys.stderr, "\n".join(errors) return playbook def main(args): """ Set up and run a local playbook """ usage = "%prog [options] [playbook.yml]" parser = utils.SortedOptParser(usage=usage) parser.add_option('--purge', default=False, action='store_true', help='purge checkout after playbook run') parser.add_option('-o', '--only-if-changed', dest='ifchanged', default=False, action='store_true', help='only run the playbook if the repository has been updated') parser.add_option('-f', '--force', dest='force', default=False, action='store_true', help='run the playbook even if the repository could ' 'not be updated') parser.add_option('-d', '--directory', dest='dest', default=None, help='directory to checkout repository to') parser.add_option('-U', '--url', dest='url', default=None, help='URL of the playbook repository') parser.add_option('-C', '--checkout', dest='checkout', help='branch/tag/commit to checkout. ' 'Defaults to behavior of repository module.') parser.add_option('-i', '--inventory-file', dest='inventory', help="location of the inventory host file") parser.add_option('-m', '--module-name', dest='module_name', default=DEFAULT_REPO_TYPE, help='Module name used to check out repository. ' 'Default is %s.' % DEFAULT_REPO_TYPE) options, args = parser.parse_args(args) hostname = socket.getfqdn() if not options.dest: # use a hostname dependent directory, in case of $HOME on nfs options.dest = utils.prepare_writeable_dir('~/.ansible/pull/%s' % hostname) options.dest = os.path.abspath(options.dest) if not options.url: parser.error("URL for repository not specified, use -h for help") return 1 now = datetime.datetime.now() print >>sys.stderr, now.strftime("Starting ansible-pull at %F %T") inv_opts = 'localhost,' limit_opts = 'localhost:%s:127.0.0.1' % hostname base_opts = '-c local --limit "%s"' % limit_opts repo_opts = "name=%s dest=%s" % (options.url, options.dest) if options.checkout: repo_opts += ' version=%s' % options.checkout path = utils.plugins.module_finder.find_plugin(options.module_name) if path is None: sys.stderr.write("module '%s' not found.\n" % options.module_name) return 1 cmd = 'ansible all -i "%s" %s -m %s -a "%s"' % ( inv_opts, base_opts, options.module_name, repo_opts ) rc, out = _run(cmd) if rc != 0: if options.force: print "Unable to update repository. Continuing with (forced) run of playbook." else: return rc elif options.ifchanged and '"changed": true' not in out: print "Repository has not changed, quitting." return 0 playbook = select_playbook(options.dest, args) if playbook is None: print >>sys.stderr, "Could not find a playbook to run." return 1 cmd = 'ansible-playbook %s %s' % (base_opts, playbook) if options.inventory: cmd += ' -i "%s"' % options.inventory os.chdir(options.dest) rc, out = _run(cmd) if options.purge: os.chdir('/') try: shutil.rmtree(options.dest) except Exception, e: print >>sys.stderr, "Failed to remove %s: %s" % (options.dest, str(e)) return rc if __name__ == '__main__': try: sys.exit(main(sys.argv[1:])) except KeyboardInterrupt, e: print >>sys.stderr, "Exit on user request.\n" sys.exit(1)