Inventory script for Spacewalk servers based on the spacewalk-reports package

plugins/inventory/spacewalk.py

+#!/bin/env python
+
+"""
+Spacewalk external inventory script
+=================================
+
+Ansible has a feature where instead of reading from /etc/ansible/hosts
+as a text file, it can query external programs to obtain the list
+of hosts, groups the hosts are in, and even variables to assign to each host.
+
+To use this, copy this file over /etc/ansible/hosts and chmod +x the file.
+This, more or less, allows you to keep one central database containing
+info about all of your managed instances.
+
+This script is dependent upon the spacealk-reports package being installed
+on the same machine. It is basically a CSV-to-JSON converter from the
+output of "spacewalk-report system-groups-systems|inventory".
+
+Tested with Ansible 1.1
+"""
+# 
+# Author:: Jon Miller <jonEbird@gmail.com>
+# Copyright:: Copyright (c) 2013, Jon Miller
+# 
+# This program 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 2 of the License, or (at
+# your option) any later version.
+# 
+# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+# 
+
+import sys
+import os
+import time
+from optparse import OptionParser
+import subprocess
+
+try:
+    import json
+except:
+    import simplejson as json
+
+base_dir  = os.path.dirname(os.path.realpath(__file__))
+SW_REPORT = '/usr/bin/spacewalk-report'
+CACHE_DIR = os.path.join(base_dir, ".spacewalk_reports")
+CACHE_AGE = 300 # 5min
+
+# Sanity check
+if not os.path.exists(SW_REPORT):
+    print >> sys.stderr, 'Error: %s is required for operation.' % (SW_REPORT)
+    sys.exit(1)
+
+# Pre-startup work
+if not os.path.exists(CACHE_DIR):
+    os.mkdir(CACHE_DIR)
+    os.chmod(CACHE_DIR, 0775)
+
+# Helper functions
+#------------------------------
+
+def spacewalk_report(name):
+    """Yield a dictionary form of each CSV output produced by the specified
+    spacewalk-report
+    """
+    cache_filename = os.path.join(CACHE_DIR, name)
+    if not os.path.exists(cache_filename) or \
+            (time.time() - os.stat(cache_filename).st_mtime) > CACHE_AGE:
+        # Update the cache
+        fh = open(cache_filename, 'w')
+        p = subprocess.Popen([SW_REPORT, name], stdout=fh)
+        p.wait()
+        fh.close()
+        os.chmod(cache_filename, 0664)
+
+    lines = open(cache_filename, 'r').readlines()
+    keys = lines[0].strip().split(',')
+    for line in lines[1:]:
+        values = line.strip().split(',')
+        if len(keys) == len(values):
+            yield dict(zip(keys, values))
+
+
+# Options
+#------------------------------
+
+parser = OptionParser(usage="%prog [options] --list | --host <machine>")
+parser.add_option('--list', default=False, dest="list", action="store_true",
+                  help="Produce a JSON consumable grouping of servers for Ansible")
+parser.add_option('--host', default=None, dest="host",
+                  help="Generate additional host specific details for given host for Ansible")
+parser.add_option('-H', '--human', dest="human",
+                  default=False, action="store_true",
+                  help="Produce a friendlier version of either server list or host detail")
+(options, args) = parser.parse_args()
+
+
+# List out the known server from Spacewalk
+#------------------------------
+if options.list:
+
+    groups = {}
+    try:
+        for system in spacewalk_report('system-groups-systems'):
+            if system['group_name'] not in groups:
+                groups[system['group_name']] = set()
+
+            groups[system['group_name']].add(system['server_name'])
+
+    except (OSError), e:
+        print >> sys.stderr, 'Problem executing the command "%s system-groups-systems": %s' % \
+            (SW_REPORT, str(e))
+        sys.exit(2)
+
+    if options.human:
+        for group, systems in groups.iteritems():
+            print '[%s]\n%s\n' % (group, '\n'.join(systems))
+    else:
+        print json.dumps(dict([ (k, list(s)) for k, s in groups.iteritems() ]))
+
+    sys.exit(0)
+
+
+# Return a details information concerning the spacewalk server
+#------------------------------
+elif options.host:
+
+    host_details = {}
+    try:
+        for system in spacewalk_report('inventory'):
+            if system['hostname'] == options.host:
+                host_details = system
+                break
+
+    except (OSError), e:
+        print >> sys.stderr, 'Problem executing the command "%s inventory": %s' % \
+            (SW_REPORT, str(e))
+        sys.exit(2)
+    
+    if options.human:
+        print 'Host: %s' % options.host
+        for k, v in host_details.iteritems():
+            print '  %s: %s' % (k, '\n    '.join(v.split(';')))
+    else:
+        print json.dumps(host_details)
+
+    sys.exit(0)
+
+else:
+
+    parser.print_help()
+    sys.exit(1)