initial add of eos_config module

This adds a new module for pushing configuraitons to eos devices in a
reliable and repeatable fashion.  It includes support for templating
configurations and backing up the current config prior to pushing out
changes.  This module works over either CLI or EAPI.

This PR has a dependency on ansible/ansible PR #14009 being merged

network/eos/eos_config.py

@@ -0,0 +1,279 @@
+#!/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: eos_config
+version_added: "2.1"
+author: "Peter sprygada (@privateip)"
+short_description: Manage Arista EOS configuration sections
+description:
+  - Arista EOS configurations use a simple block indent file sytanx
+    for segementing configuration into sections.  This module provides
+    an implementation for working with eos configuration sections in
+    a deterministic way.  This module works with either CLI or eapi
+    transports.
+extends_documentation_fragment: eos
+options:
+  lines:
+    description:
+      - The ordered set of commands that should be configured in the
+        section.  The commands must be the exact same commands as found
+        in the device running-config.  Be sure to note the configuration
+        command syntanx as some commands are automatically modified by the
+        device config parser.
+    required: true
+  parents:
+    description:
+      - The ordered set of parents that uniquely identify the section
+        the commands should be checked against.  If the parents argument
+        is omitted, the commands are checked against the set of top
+        level or global commands.
+    required: false
+    default: null
+  before:
+    description:
+      - The ordered set of commands to push on to the command stack if
+        a change needs to be made.  This allows the playbook designer
+        the opportunity to perform configuration commands prior to pushing
+        any changes without affecting how the set of commands are matched
+        against the system
+    required: false
+    default: null
+  after:
+    description:
+      - The ordered set of commands to append to the end of the command
+        stack if a changed needs to be made.  Just like with I(before) this
+        allows the playbook designer to append a set of commands to be
+        executed after the command set.
+    required: false
+    default: null
+  match:
+    description:
+      - Instructs the module on the way to perform the matching of
+        the set of commands against the current device config.  If
+        match is set to I(line), commands are matched line by line.  If
+        match is set to I(strict), command lines are matched with respect
+        to position.  Finally if match is set to I(exact), command lines
+        must be an equal match.
+    required: false
+    default: line
+    choices: ['line', 'strict', 'exact']
+  replace:
+    description:
+      - Instructs the module on the way to perform the configuration
+        on the device.  If the replace argument is set to I(line) then
+        the modified lines are pushed to the device in configuration
+        mode.  If the replace argument is set to I(block) then the entire
+        command block is pushed to the device in configuration mode if any
+        line is not correct
+    required: false
+    default: line
+    choices: ['line', 'block']
+  force:
+    description:
+      - The force argument instructs the module to not consider the
+        current devices 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
+  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 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 = """
+- eos_config:
+    lines: ['hostname {{ inventory_hostname }}']
+    force: yes
+
+- eos_config:
+    lines:
+      - 10 permit ip 1.1.1.1/32 any log
+      - 20 permit ip 2.2.2.2/32 any log
+      - 30 permit ip 3.3.3.3/32 any log
+      - 40 permit ip 4.4.4.4/32 any log
+      - 50 permit ip 5.5.5.5/32 any log
+    parents: ['ip access-list test']
+    before: ['no ip access-list test']
+    match: exact
+
+- eos_config:
+    lines:
+      - 10 permit ip 1.1.1.1/32 any log
+      - 20 permit ip 2.2.2.2/32 any log
+      - 30 permit ip 3.3.3.3/32 any log
+      - 40 permit ip 4.4.4.4/32 any log
+    parents: ['ip access-list test']
+    before: ['no ip access-list test']
+    replace: block
+
+- eos_config:
+    commands: "{{lookup('file', 'datcenter1.txt'}}"
+    parents: ['ip access-list test']
+    before: ['no ip access-list test']
+    replace: block
+
+"""
+
+RETURN = """
+
+lines:
+  description: The set of commands that will be pushed to the remote device
+  returned: always
+  type: list
+  sample: ['...', '...']
+
+response:
+  description: The set of responses from issuing the commands on the device
+  retured: always
+  type: list
+  sample: ['...', '...']
+
+"""
+import re
+import itertools
+
+def get_config(module):
+    config = module.params['config'] or dict()
+    if not config and not module.params['force']:
+        config = module.config
+    return config
+
+def build_candidate(lines, parents, config, strategy):
+    candidate = list()
+
+    if strategy == 'strict':
+        if len(lines) != len(config):
+            candidate = list(lines)
+        else:
+            for index, cmd in enumerate(lines):
+                try:
+                    if cmd != config[index]:
+                        candidate.append(cmd)
+                except IndexError:
+                    candidate.append(cmd)
+
+    elif strategy == 'exact':
+        if len(lines) != len(config):
+            candidate = list(lines)
+        else:
+            for cmd, cfg in itertools.izip(lines, config):
+                if cmd != cfg:
+                    candidate = list(lines)
+                    break
+
+    else:
+        for cmd in lines:
+            if cmd not in config:
+                candidate.append(cmd)
+
+    return candidate
+
+
+def main():
+    """ main entry point for module execution
+    """
+
+    argument_spec = dict(
+        lines=dict(aliases=['commands'], required=True, type='list'),
+        parents=dict(type='list'),
+        before=dict(type='list'),
+        after=dict(type='list'),
+        match=dict(default='line', choices=['line', 'strict', 'exact']),
+        replace=dict(default='line', choices=['line', 'block']),
+        force=dict(default=False, type='bool'),
+        config=dict()
+    )
+
+    module = get_module(argument_spec=argument_spec,
+                        mutually_exclusive=mutually_exclusive,
+                        supports_check_mode=True)
+
+    lines = module.params['lines']
+    parents = module.params['parents'] or list()
+
+    result = dict(changed=False)
+
+    match = module.params['match']
+    replace = module.params['replace']
+
+    contents = get_config(module)
+    config = module.parse_config(contents)
+
+    if parents:
+        for parent in parents:
+            for item in config:
+                if item.text == parent:
+                    config = item
+
+        try:
+            children = [c.text for c in config.children]
+        except AttributeError:
+            children = [c.text for c in config]
+
+    else:
+        children = [c.text for c in config if not c.parents]
+
+    result = dict(changed=False)
+
+    candidate = build_candidate(lines, parents, children, match)
+
+    if candidate:
+        if replace == 'line':
+            candidate[:0] = parents
+        else:
+            candidate = list(parents)
+            candidate.extend(lines)
+
+        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:
+            response = module.configure(candidate)
+            result['response'] = response
+        result['changed'] = True
+
+    result['lines'] = candidate
+    return module.exit_json(**result)
+
+from ansible.module_utils.basic import *
+from ansible.module_utils.urls import *
+from ansible.module_utils.shell import *
+from ansible.module_utils.netcfg import *
+from ansible.module_utils.eos import *
+if __name__ == '__main__':
+    main()
+