Implement #9650 Add parameter hooks to inventory plugin iocage (#9651)

* Add parameter hooks to inventory plugin iocage.

* Add changelog fragment.

* Update plugins/inventory/iocage.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* Parameter renamed to hooks_results

* Fix DOCUMENTATION YAML 4-space indentation.

* Fix DOCUMENTATION YAML 2-space indentation.

* Update changelogs/fragments/9651-iocage-inventory-hooks.yml

Co-authored-by: Felix Fontein <felix@fontein.de>

* Add note about activated pool mountpoint.

---------

Co-authored-by: Felix Fontein <felix@fontein.de>

changelogs/fragments/9651-iocage-inventory-hooks.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - iocage inventory plugin - the new parameter ``hooks_results`` of the plugin is a list of files inside a jail that provide configuration parameters for the inventory. The inventory plugin reads the files from the jails and put the contents into the items of created variable ``iocage_hooks`` (https://github.com/ansible-collections/community.general/issues/9650, https://github.com/ansible-collections/community.general/pull/9651).

plugins/inventory/iocage.py

@@ -6,7 +6,7 @@
 
 from __future__ import annotations
 
-DOCUMENTATION = '''
+DOCUMENTATION = r'''
 name: iocage
 short_description: iocage inventory source
 version_added: 10.2.0
@@ -71,6 +71,15 @@ DOCUMENTATION = '''
       - Enable O(sudo_preserve_env) if O(sudo) is enabled.
     type: dict
     default: {}
+  hooks_results:
+    description:
+      - List of paths to the files in a jail.
+      - Content of the files is stored in the items of the list C(iocage_hooks).
+      - If a file is not available the item keeps the dash character C(-).
+      - The variable C(iocage_hooks) is not created if O(hooks_results) is empty.
+    type: list
+    elements: path
+    version_added: 10.4.0
 notes:
   - You might want to test the command C(ssh user@host iocage list -l) on
     the controller before using this inventory plugin with O(user) specified
@@ -82,9 +91,14 @@ DOCUMENTATION = '''
     command C(iocage list -l).
   - The names of these variables correspond to the output columns.
   - The column C(NAME) is used to name the added host.
+  - The option O(hooks_results) expects the C(poolname) of a jail is mounted to
+    C(/poolname). For example, if you activate the pool C(iocage) this plugin
+    expects to find the O(hooks_results) items in the path
+    C(/iocage/iocage/jails/<name>/root). If you mount the C(poolname) to a
+    different path the easiest remedy is to create a symlink.
 '''
 
-EXAMPLES = '''
+EXAMPLES = r'''
 ---
 # file name must end with iocage.yaml or iocage.yml
 plugin: community.general.iocage
@@ -142,6 +156,18 @@ keyed_groups:
     key: iocage_release
   - prefix: state
     key: iocage_state
+
+---
+# Read the file /var/db/dhclient-hook.address.epair0b in the jails and use it as ansible_host
+plugin: community.general.iocage
+host: 10.1.0.73
+user: admin
+hooks_results:
+  - /var/db/dhclient-hook.address.epair0b
+compose:
+  ansible_host: iocage_hooks.0
+groups:
+  test: inventory_hostname.startswith('test')
 '''
 
 import re
@@ -226,6 +252,7 @@ class InventoryModule(BaseInventoryPlugin, Constructable, Cacheable):
         sudo_preserve_env = self.get_option('sudo_preserve_env')
         env = self.get_option('env')
         get_properties = self.get_option('get_properties')
+        hooks_results = self.get_option('hooks_results')
 
         cmd = []
         my_env = os.environ.copy()
@@ -286,6 +313,50 @@ class InventoryModule(BaseInventoryPlugin, Constructable, Cacheable):
 
                 self.get_properties(t_stdout, results, hostname)
 
+        if hooks_results:
+            cmd_get_pool = cmd.copy()
+            cmd_get_pool.append(self.IOCAGE)
+            cmd_get_pool.append('get')
+            cmd_get_pool.append('--pool')
+            try:
+                p = Popen(cmd_get_pool, stdout=PIPE, stderr=PIPE, env=my_env)
+                stdout, stderr = p.communicate()
+                if p.returncode != 0:
+                    raise AnsibleError(
+                        f'Failed to run cmd={cmd_get_pool}, rc={p.returncode}, stderr={to_native(stderr)}')
+                try:
+                    iocage_pool = to_text(stdout, errors='surrogate_or_strict').strip()
+                except UnicodeError as e:
+                    raise AnsibleError(f'Invalid (non unicode) input returned: {e}') from e
+            except Exception as e:
+                raise AnsibleError(f'Failed to get pool: {e}') from e
+
+            for hostname, host_vars in results['_meta']['hostvars'].items():
+                iocage_hooks = []
+                for hook in hooks_results:
+                    path = "/" + iocage_pool + "/iocage/jails/" + hostname + "/root" + hook
+                    cmd_cat_hook = cmd.copy()
+                    cmd_cat_hook.append('cat')
+                    cmd_cat_hook.append(path)
+                    try:
+                        p = Popen(cmd_cat_hook, stdout=PIPE, stderr=PIPE, env=my_env)
+                        stdout, stderr = p.communicate()
+                        if p.returncode != 0:
+                            iocage_hooks.append('-')
+                            continue
+
+                        try:
+                            iocage_hook = to_text(stdout, errors='surrogate_or_strict').strip()
+                        except UnicodeError as e:
+                            raise AnsibleError(f'Invalid (non unicode) input returned: {e}') from e
+
+                    except Exception:
+                        iocage_hooks.append('-')
+                    else:
+                        iocage_hooks.append(iocage_hook)
+
+                results['_meta']['hostvars'][hostname]['iocage_hooks'] = iocage_hooks
+
         return results
 
     def get_jails(self, t_stdout, results):