Vagrant inventory plugin

Voorbeeld van een aangepaste inventory plugin voor Vagrant in de PHX-referentie-implementatie. De plugin illustreert het opbouwen van inventory, en het gebruik ervan in de ontwikkelomgeving simuleert dynamische inventory met behulp van een statisch Vagrantfile.yml.

De PHX referentie-implementatie  c2platform/phx/ansible bevat een voorbeeld van een aangepaste inventory plugin. De plugin plugins/inventory/vagrant.py leest Vagrantfile.yml om de inventory te genereren. Het voegt hosts toe, stelt variabelen in zoals IP-adressen en wijst groepen toe op basis van prefixen, labels en aanvullende INI-bestanden. Het kan de gegenereerde inventory ook exporteren naar een INI-bestand voor debugging of integratie.

 plugins/inventory/vagrant.py

# pylint: disable=super-with-arguments
#!/usr/bin/env python3
import os
import yaml
from ansible.errors import AnsibleError
from ansible.plugins.inventory import BaseInventoryPlugin
import configparser
import re


class InventoryModule(BaseInventoryPlugin):
    NAME = "vagrant"

    def verify_file(self, path):
        return path.endswith((".yml", ".yaml")) and "Vagrantfile" in os.path.basename(
            path
        )

    def parse(self, inventory, loader, path, cache=True):
        super(InventoryModule, self).parse(inventory, loader, path, cache)
        try:
            with open(path, "r", encoding="utf-8") as file_handle:
                data = yaml.safe_load(file_handle)
        except Exception as exception_error:
            raise AnsibleError(
                f"Error loading Vagrantfile: {str(exception_error)}"
            ) from exception_error
        boxes = data.get("boxes")
        defaults = data.get("defaults", {})
        default_prefix = defaults.get("prefix")
        for node in data.get("nodes", []):
            nodename = node.get("name")
            host_prefix = node.get("prefix", default_prefix)
            host = f"{host_prefix}-{nodename}"
            if not host:
                continue
            self.inventory.add_host(host)
            ip_address = node.get("ip-address")
            if ip_address:
                self.inventory.set_variable(host, "ansible_host", ip_address)
            # Determine environment group based on last letter of prefix
            if host_prefix:
                last_char = host_prefix[-1].lower()
                env_group = None
                if last_char == "d":
                    env_group = "development"
                elif last_char == "t":
                    env_group = "test"
                elif last_char == "a":
                    env_group = "acceptance"
                elif last_char == "p":
                    env_group = "production"
                if env_group:
                    self.inventory.add_group(env_group)
                    self.inventory.add_child(env_group, host)
            # Labels
            node_labels = node.get("labels", [])
            box_labels = boxes.get(node.get("box", ""), {}).get("labels", [])
            for label in node_labels + box_labels:
                self.inventory.add_group(label)
                if label != host:
                    self.inventory.add_child(label, host)

        # Handle additional inventory files
        inventory_files = defaults.get("inventory", [])
        for inv_file in inventory_files:
            inv_path = os.path.join(os.path.dirname(path), inv_file)
            if os.path.exists(inv_path):
                self._parse_ini(inv_path)

        # Export to INI if configured
        inventory_export = defaults.get("inventory_export")
        if inventory_export:
            export_path = os.path.join(os.path.dirname(path), inventory_export)
            self._write_ini(export_path)

    def _parse_ini(self, ini_path):
        print(f"ini_path: {ini_path}")
        config = configparser.ConfigParser(allow_no_value=True)
        with open(ini_path, "r", encoding="utf-8") as f:
            config.read_file(f)

        for section in config.sections():
            if ":" in section:
                group_name, section_type = section.split(":", 1)
                group_name = group_name.strip()
                section_type = section_type.strip()
                if section_type == "children":
                    if group_name not in self.inventory.groups:
                        self.inventory.add_group(group_name)
                    for child in config.options(section):
                        child = child.strip()
                        if child:
                            self.inventory.add_group(child)
                            self.inventory.add_child(group_name, child)
                elif section_type == "vars":
                    if group_name not in self.inventory.groups:
                        self.inventory.add_group(group_name)
                    for var, value in config.items(section):
                        value = value.strip() if value else None
                        self.inventory.set_variable(group_name, var, value)
            else:
                # Regular group
                self.inventory.add_group(section)
                for host in config.options(section):
                    host = host.strip()
                    if host:
                        # Check if it's a host with vars, but in simple ini, options are hosts
                        # If there's value, it might be port or something, but for now assume host
                        self.inventory.add_host(host, group=section)
                        # If there are vars like host=var, but in standard ini, hosts are keys with no value

        # Handle host vars if any, but in standard ini, host vars are in [host:vars] which we handle above

    def _write_ini(self, ini_path):
        config = configparser.ConfigParser(allow_no_value=True)

        # Add groups and hosts
        for group_name, group in self.inventory.groups.items():
            if group_name == 'all' or group_name == 'ungrouped':
                continue
            config.add_section(group_name)
            for host in group.hosts:
                config.set(group_name, host.name, None)

        # Add children
        for group_name, group in self.inventory.groups.items():
            if group.child_groups:
                section = f"{group_name}:children"
                config.add_section(section)
                for child in group.child_groups:
                    config.set(section, child.name, None)

        # Add group vars
        for group_name, group in self.inventory.groups.items():
            vars_dict = group.get_vars()
            if vars_dict:
                section = f"{group_name}:vars"
                config.add_section(section)
                for k, v in vars_dict.items():
                    config.set(section, k, str(v))

        # Add host vars
        for host_name, host in self.inventory.hosts.items():
            vars_dict = host.get_vars()
            # Remove ansible_host as it's usually set separately
            vars_dict = {k: v for k, v in vars_dict.items() if k != 'ansible_host'}
            if vars_dict:
                section = f"{host_name}:vars"
                config.add_section(section)
                for k, v in vars_dict.items():
                    config.set(section, k, str(v))

        # Add [host] sections for hosts with ansible_host
        for host_name, host in self.inventory.hosts.items():
            ansible_host = host.get_vars().get('ansible_host')
            if ansible_host:
                section = host_name
                if not config.has_section(section):
                    config.add_section(section)
                config.set(section, f'ansible_host={ansible_host}')

        with open(ini_path, 'w', encoding='utf-8') as f:
            config.write(f)

De Vagrant inventory plugin is een Ansible inventory plugin die wordt gebruikt voor de ontwikkelomgeving.

Het doel van deze plugin is tweeledig. Ten eerste biedt het een enkele bron van waarheid voor zowel Vagrant als Ansible tijdens ontwikkeling. Dit elimineert de noodzaak om informatie te dupliceren, zoals IP-adressen, in Vagrant- en Ansible-configuraties.

Ten tweede illustreert het hoe inventory voor Ansible kan worden opgebouwd met een aangepaste module of plugin. De toepassing in de ontwikkelomgeving simuleert dynamische inventaris. Veel overheidsorganisaties worstelen met het concept van dynamische inventory. Deze plugin dient als een praktisch voorbeeld van een aangepaste inventory plugin.