initial add of ios_template module

This adds a new module for working with IOS devices and building configurations
using templates.

network/ios/ios_template.py

@@ -0,0 +1,217 @@
+#!/usr/bin/python
+#
+# 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/>.
+#
+DOCUMENTATION = """
+---
+module: ios_config
+version_added: "2.1"
+author: "Peter sprygada (@privateip)"
+short_description: Manage Cisco IOS device configurations over SSH
+description:
+  - Manages network device configurations over SSH.  This module
+    allows implementors to work with the device running-config.  It
+    provides a way to push a set of commands onto a network device
+    by evaluting the current running-config and only pushing configuration
+    commands that are not already configured.  The config source can
+    be a set of commands or a template.
+extends_documentation_fragment: ios
+options:
+  src:
+    description:
+      - The path to the config source.  The source can be either a
+        file with config or a template that will be merged during
+        runtime.  By default the task will first search for the source
+        file in role or playbook root folder in templates unless a full
+        path to the file is given.
+    required: false
+    default: null
+  force:
+    description:
+      - The force argument instructs the module not to consider the
+        current device running-config.  When set to true, this will
+        cause the module to push the contents of I(src) into the device
+        without first checking if already configured.
+    required: false
+    default: false
+    choices: BOOLEANS
+  include_defaults:
+    description:
+      - The module, by default, will collect the current device
+        running-config to use as a base for comparision to the commands
+        in I(src).  Setting this value to true will cause the command
+        issued to add any necessary flags to collect all defaults as
+        well as the device configuration.  If the destination device
+        does not support such a flag, this argument is silently ignored.
+    required: false
+    default: false
+    choices: BOOLEANS
+  backup:
+    description:
+      - When this argument is configured true, the module will backup
+        the running-config from the node prior to making any changes.
+        The backup file will be written to backup_{{ hostname }} in
+        the root of the playbook directory.
+    required: false
+    default: false
+    choices: BOOLEANS
+  ignore_missing:
+    description:
+      - This flag instruts the module to ignore lines that are missing
+        from the device configuration.  In some instances, the config
+        command doesn't show up in the running-config because it is the
+    required: false
+    default: false
+    choices: BOOLEANS
+  config:
+    description:
+      - The module, by default, will connect to the remote device and
+        retrieve the current running-config to use as a base for comparing
+        against the contents of source.  There are times when it is not
+        desirable to have the task get the current running-config for
+        every task.  The I(config) argument allows the implementer to
+        pass in the configuruation to use as the base config for
+        comparision.
+    required: false
+    default: null
+"""
+
+EXAMPLES = """
+
+- name: push a configuration onto the device
+  net_config:
+    src: config.j2
+
+- name: forceable push a configuration onto the device
+  net_config:
+    src: config.j2
+    force: yes
+
+- name: provide the base configuration for comparision
+  net_config:
+    src: candidate_config.txt
+    config: current_config.txt
+
+
+"""
+
+RETURN = """
+
+commands:
+  description: The set of commands that will be pushed to the remote device
+  returned: always
+  type: list
+  sample: [...]
+
+"""
+
+def compare(this, other, ignore_missing=False):
+    parents = [item.text for item in this.parents]
+    for entry in other:
+        if this == entry:
+            return None
+    if not ignore_missing:
+        return this
+
+def expand(obj, queue):
+    block = [item.raw for item in obj.parents]
+    block.append(obj.raw)
+
+    current_level = queue
+    for b in block:
+        if b not in current_level:
+            current_level[b] = collections.OrderedDict()
+        current_level = current_level[b]
+    for c in obj.children:
+        if c.raw not in current_level:
+            current_level[c.raw] = collections.OrderedDict()
+
+def flatten(data, obj):
+    for k, v in data.items():
+        obj.append(k)
+        flatten(v, obj)
+    return obj
+
+def get_config(module):
+    config = module.params['config'] or dict()
+    if not config and not module.params['force']:
+        config = module.config
+    return config
+
+def main():
+    """ main entry point for module execution
+    """
+
+    argument_spec = dict(
+        src=dict(),
+        force=dict(default=False, type='bool'),
+        include_defaults=dict(default=True, type='bool'),
+        backup=dict(default=False, type='bool'),
+        ignore_missing=dict(default=False, type='bool'),
+        config=dict(),
+    )
+
+    mutually_exclusive = [('config', 'backup'), ('config', 'force')]
+
+    module = get_module(argument_spec=argument_spec,
+                        mutually_exclusive=mutually_exclusive,
+                        supports_check_mode=True)
+
+    ignore_missing = module.params['ignore_missing']
+
+    result = dict(changed=False)
+
+    candidate = module.parse_config(module.params['src'])
+
+    contents = get_config(module)
+    result['_backup'] = module.config
+
+    config = module.parse_config(contents)
+
+    commands = collections.OrderedDict()
+    toplevel = [c.text for c in config]
+
+    for line in candidate:
+        if line.text in ['!', '']:
+            continue
+
+        if not line.parents:
+            if line.text not in toplevel:
+                expand(line, commands)
+        else:
+            item = compare(line, config, ignore_missing)
+            if item:
+                expand(item, commands)
+
+    commands = flatten(commands, list())
+
+    if commands:
+        if not module.check_mode:
+            commands = [str(c).strip() for c in commands]
+            response = module.configure(commands)
+        result['changed'] = True
+
+    result['commands'] = commands
+    return module.exit_json(**result)
+
+
+from ansible.module_utils.basic import *
+from ansible.module_utils.shell import *
+from ansible.module_utils.netcfg import *
+from ansible.module_utils.ios import *
+if __name__ == '__main__':
+    main()
+