Add RHN subscription_manager module

The subscription_manager module acts as a wrapper to the command
'subscription-manager'.  The subscription-manager utility allows users
to manage RHN registration, subscription and yum repositories from the
Red Hat Entitlement platform.

Currently, this module supports the following sub-commands:
 * config
 * [un]register
 * subscribe

library/packaging/subscription_manager

@@ -0,0 +1,335 @@
+#!/usr/bin/python
+
+DOCUMENTATION = '''
+---
+module: subscription-manager
+short_description: Define interface to subscription-manager
+description:
+    - Adds or removes Red Hat software channels on a system
+version_added: 1.0
+author: James Laska
+notes:
+    - this module fetches the systemid from rhn. A function
+      to use the local systemid is provided (get_localsystem)
+      but not integrated
+requirements:
+    - none
+options:
+    username:
+        description
+            - RHN username
+        required: false
+        default: null
+    password:
+        description:
+            - RHN password
+        required: false
+        default: null
+    server_hostname:
+        description:
+            - Specify an alternative RHN server
+        required: false
+    server_insecure:
+        description:
+            - Allow RHN traffic over insecure http
+        required: false
+        default: false
+    rhsm_baseurl:
+        description:
+            - Specify CDN baseurl
+        required: false
+        default: false
+    autosubscribe:
+        description:
+            - Upon successful registration, auto-consume available subscriptions
+        required: false
+        default: false
+    activationkey:
+        description:
+            - supply an activation key for use with registration
+        required: false
+        default: null
+    pool:
+        description:
+            - A pool to subscribe to (accepts regular expression syntax)
+        required: false
+        default: '^$'
+examples:
+    - code: subscription_manager action=register username=rhsm_user password=somepass autosubscribe=true
+'''
+
+import os
+import re
+import types
+import subprocess
+import ConfigParser
+import shlex
+
+
+class CommandException(Exception):
+    pass
+
+
+def run_command(args):
+    '''
+        Convenience method to run a command, specified as a list of arguments.
+        Returns:
+            * tuple - (stdout, stder, retcode)
+    '''
+
+    # Coerce into a string
+    if isinstance(args, str):
+        args = shlex.split(args)
+
+    # Run desired command
+    proc = subprocess.Popen(args, stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT)
+    (stdout, stderr) = proc.communicate()
+    returncode = proc.poll()
+    if returncode != 0:
+        cmd = ' '.join(args)
+        raise CommandException("Command failed (%s): %s\n%s" % (returncode, cmd, stdout))
+    return (stdout, stderr, returncode)
+
+
+class RhsmPool(object):
+    def __init__(self, **kwargs):
+        for k,v in kwargs.items():
+            setattr(self, k, v)
+    def __str__(self):
+        return str(self.__getattribute__('_name'))
+    def subscribe(self):
+        (stdout, stderr, retcode) = run_command("subscription-manager subscribe --pool %s" % self.PoolId)
+        return True
+
+
+class RhsmPools(object):
+    """
+        This class is used for manipulating pools subscriptions with RHSM
+    """
+    def __init__(self):
+        self.products = self._load_product_list()
+
+    def __iter__(self):
+        return self.products.__iter__()
+
+    def _load_product_list(self):
+        """
+            Loads list of all availaible pools for system in data structure
+        """
+        (stdout, stderr, retval) = run_command("subscription-manager list --available")
+
+        products = []
+        for line in stdout.split('\n'):
+            # Remove leading+trailing whitespace
+            line = line.strip()
+            # An empty line implies the end of a output group
+            if len(line) == 0:
+                continue
+            # If a colon ':' is found, parse
+            elif ':' in line:
+                (key, value) = line.split(':',1)
+                key = key.strip().replace(" ", "")  # To unify
+                value = value.strip()
+                if key in ['ProductName', 'SubscriptionName']:
+                    # Remember the name for later processing
+                    products.append(RhsmPool(_name=value, key=value))
+                elif products:
+                    # Associate value with most recently recorded product
+                    products[-1].__setattr__(key, value)
+                # FIXME - log some warning?
+                #else:
+                    # warnings.warn("Unhandled subscription key/value: %s/%s" % (key,value))
+        return products
+
+    def filter(self, regexp='^$'):
+        '''
+            Return a list of RhsmPools whose name matches the provided regular expression
+        '''
+        r = re.compile(regexp)
+        for product in self.products:
+            if r.search(product._name):
+                yield product
+
+
+def read_rhsm_config(rhsm_conf='/etc/rhsm/rhsm.conf'):
+    '''
+        Load RHSM configuration from /etc/rhsm/rhsm.conf.
+        Returns:
+         * ConfigParser object
+    '''
+
+    # Read RHSM defaults ...
+    cp = ConfigParser.ConfigParser()
+    if os.path.isfile(rhsm_conf):
+        cp.read(rhsm_conf)
+
+    # Add support for specifying a default value w/o having to standup some configuration
+    # Yeah, I know this should be subclassed ... but, oh well
+    def get_option_default(self, key, default=''):
+        sect, opt = key.split('.', 1)
+        if self.has_section(sect) and self.has_option(sect, opt):
+            return self.get(sect, opt)
+        else:
+            return default
+
+    cp.get_option = types.MethodType(get_option_default, cp, ConfigParser.ConfigParser)
+
+    return cp
+
+
+def is_registered():
+    '''
+        Determine whether the current system
+        Returns:
+          * Boolean - whether the current system is currently registered to
+                      RHN.
+    '''
+    # Quick version...
+    if False:
+        return os.path.isfile('/etc/pki/consumer/cert.pem') and \
+               os.path.isfile('/etc/pki/consumer/key.pem')
+
+    args = ['subscription-manager', 'identity']
+    try:
+        (stdout, stderr, retcode) =  run_command(args)
+    except CommandException, e:
+        return False
+    else:
+        # Display some debug output
+        return True
+
+
+def configure(**kwargs):
+    '''
+        Configure the system as directed for registration with RHN
+        Raises:
+          * Exception - if error occurs while running command
+    '''
+    args = ['subscription-manager', 'config']
+
+    # Pass supplied **kwargs as parameters to subscription-manager.  Ignore
+    # non-configuration parameters and replace '_' with '.'.  For example,
+    # 'server_hostname' becomes '--system.hostname'.
+    for k,v in kwargs.items():
+        if re.search(r'^(system|rhsm)_', k):
+            args.append('--%s=%s' % (k.replace('_','.'), v))
+
+    run_command(args)
+
+
+def register(username, password, autosubscribe, activationkey):
+    '''
+        Register the current system to the provided RHN server
+        Raises:
+          * Exception - if error occurs while running command
+    '''
+    args = ['subscription-manager', 'register']
+
+    # Generate command arguments
+    if activationkey:
+        args.append('--activationkey "%s"' % activationkey)
+    else:
+        if autosubscribe:
+            args.append('--autosubscribe')
+        if username:
+            args.extend(['--username', username])
+        if password:
+            args.extend(['--password', password])
+
+    # Do the needful...
+    run_command(args)
+
+
+def subscribe(regexp):
+    '''
+        Subscribe current system to available pools matching the specified
+        regular expression
+        Raises:
+          * Exception - if error occurs while running command
+    '''
+
+    # Available pools ready for subscription
+    available_pools = RhsmPools()
+
+    for pool in available_pools.filter(regexp):
+        pool.subscribe()
+
+
+def unregister():
+    '''
+        Unregister a currently registered system
+        Raises:
+          * Exception - if error occurs while running command
+    '''
+    args = ['subscription-manager', 'unregister']
+    return run_command(args)
+
+
+def main():
+
+    # Load RHSM configuration from file
+    cp = read_rhsm_config()
+
+    module = AnsibleModule(
+                argument_spec = dict(
+                    state = dict(default='present', choices=['present', 'absent']),
+                    username = dict(default=None, required=False),
+                    password = dict(default=None, required=False),
+                    server_hostname = dict(default=cp.get_option('server.hostname'), required=False),
+                    server_insecure = dict(default=cp.get_option('server.insecure'), required=False),
+                    rhsm_baseurl = dict(default=cp.get_option('rhsm.baseurl'), required=False),
+                    autosubscribe = dict(default=False, type='bool'),
+                    activationkey = dict(default=None, required=False),
+                    pool = dict(default='^$', required=False, type='str'),
+                )
+            )
+
+    state = module.params['state']
+    username = module.params['username']
+    password = module.params['password']
+    server_hostname = module.params['server_hostname']
+    server_insecure = module.params['server_insecure']
+    rhsm_baseurl = module.params['rhsm_baseurl']
+    autosubscribe = module.params['autosubscribe'] == True
+    activationkey = module.params['activationkey']
+    pool = module.params['pool']
+
+    # Ensure system is registered
+    if state == 'present':
+
+        # Check for missing parameters ...
+        if not (activationkey or username or password):
+            module.fail_json(msg="Missing arguments, must supply an activationkey (%s) or username (%s) and password (%s)" % (activationkey, username, password))
+        if not activationkey and not (username and password):
+            module.fail_json(msg="Missing arguments, If registering without an activationkey, must supply username or password")
+
+        # Register system
+        if is_registered():
+            module.exit_json(changed=False, msg="System already registered.")
+        else:
+            try:
+                configure(**module.params)
+                register(username, password, autosubscribe, activationkey)
+                subscribe(pool)
+            except CommandException, e:
+                module.fail_json(msg="Failed to register with '%s': %s" % (server_hostname, e))
+            else:
+                module.exit_json(changed=True, msg="System successfully registered to '%s'." % server_hostname)
+
+    # Ensure system is *not* registered
+    if state == 'absent':
+        if not is_registered():
+            module.exit_json(changed=False, msg="System already unregistered.")
+        else:
+            try:
+                unregister()
+            except CommandException, e:
+                module.fail_json(msg="Failed to unregister: %s" % e)
+            else:
+                module.exit_json(changed=True, msg="System successfully unregistered from %s." % server_hostname)
+
+
+# include magic from lib/ansible/module_common.py
+#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
+main()