initial add of junos_template

This adds a new module, junos_template, that can read in a template
config and push the changes to the device.  It can also backup the
current config.  This module is implemented over cli

Author: Peter Sprygada

network/junos/junos_template.py

@@ -0,0 +1,181 @@
+#!/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: junos_template
+version_added: "2.1"
+author: "Peter sprygada (@privateip)"
+short_description: Manage Juniper JUNOS device configurations
+description:
+  - Manages network device configurations over SSH.  This module
+    allows implementors to work with the device configuration.  It
+    provides a way to push a set of commands onto a network device
+    by evaluting the current configuration and only pushing
+    commands that are not already configured.
+extends_documentation_fragment: junos
+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 search for the source
+        file in role or playbook root folder in templates directory.
+    required: false
+    default: null
+  force:
+    description:
+      - The force argument instructs the module to not consider the
+        current devices configuration.  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
+  backup:
+    description:
+      - When this argument is configured true, the module will backup
+        the configuration 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
+  config:
+    description:
+      - The module, by default, will connect to the remote device and
+        retrieve the current configuration 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 configuration for
+        every task in a playbook.  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
+  junos_template:
+    src: config.j2
+
+- name: forceable push a configuration onto the device
+  junos_template:
+    src: config.j2
+    force: yes
+
+- name: provide the base configuration for comparision
+  junos_template:
+    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):
+    parents = [item.text for item in this.parents]
+    for entry in other:
+        if this == entry:
+            return None
+    return this
+
+def expand(obj, action='set'):
+    cmd = [action]
+    cmd.extend([p.text for p in obj.parents])
+    cmd.append(obj.text)
+    return ' '.join(cmd)
+
+def flatten(data, obj):
+    for k, v in data.items():
+        obj.append(k)
+        flatten(v, obj)
+    return obj
+
+def to_lines(config):
+    lines = list()
+    for item in config:
+        if item.raw.endswith(';'):
+            line = [p.text for p in item.parents]
+            line.append(item.text)
+            lines.append(' '.join(line))
+    return lines
+
+def get_config(module):
+    config = module.params['config'] or list()
+    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'),
+        backup=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)
+
+    result = dict(changed=False)
+
+    parsed = module.parse_config(module.params['src'])
+    commands = to_lines(parsed)
+
+    contents = get_config(module)
+    result['_backup'] = module.config
+
+    parsed = module.parse_config(contents)
+    config = to_lines(parsed)
+
+    candidate = list()
+    for item in commands:
+        if item not in config:
+            candidate.append('set %s' % item)
+
+    if candidate:
+        if not module.check_mode:
+            module.configure(candidate)
+        result['changed'] = True
+
+    result['updates'] = candidate
+    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.junos import *
+if __name__ == '__main__':
+    main()
+