Pass Docker daemon connection params from inventory to connection plugin (#157)

* Move variable handling to doc fragment, and make them known to module_utils.

* Pass Daemon connection options to connection plugin.

* Add changelog fragment.

* Fix syntax error.

* Forgot 'options:'.

changelogs/fragments/157-inventory-connection-options.yml

@@ -0,0 +1,2 @@
+minor_changes:
+- "docker_containers inventory plugin - when ``connection_type=docker-api``, now pass Docker daemon connection options from inventory plugin to connection plugin. This can be disabled by setting ``configure_docker_daemon=false`` (https://github.com/ansible-collections/community.docker/pull/157)."

plugins/connection/docker_api.py

@@ -33,41 +33,9 @@ options:
             - name: ansible_host
             - name: ansible_docker_host
 
-    # The following are options from the docs fragment. We want to allow the user to
-    # specify them with Ansible variables.
-    docker_host:
-        vars:
-            - name: ansible_docker_docker_host
-    tls_hostname:
-        vars:
-            - name: ansible_docker_tls_hostname
-    api_version:
-        vars:
-            - name: ansible_docker_api_version
-    timeout:
-        vars:
-            - name: ansible_docker_timeout
-    ca_cert:
-        vars:
-            - name: ansible_docker_ca_cert
-    client_cert:
-        vars:
-            - name: ansible_docker_client_cert
-    client_key:
-        vars:
-            - name: ansible_docker_client_key
-    ssl_version:
-        vars:
-            - name: ansible_docker_ssl_version
-    tls:
-        vars:
-            - name: ansible_docker_tls
-    validate_certs:
-        vars:
-            - name: ansible_docker_validate_certs
-
 extends_documentation_fragment:
     - community.docker.docker
+    - community.docker.docker.var_names
     - community.docker.docker.docker_py_1_documentation
 '''
 

plugins/doc_fragments/docker.py

@@ -116,6 +116,42 @@ notes:
     and use C($DOCKER_CONFIG/config.json) otherwise.
 '''
 
+    # For plugins: allow to define common options with Ansible variables
+
+    VAR_NAMES = r'''
+options:
+    docker_host:
+        vars:
+            - name: ansible_docker_docker_host
+    tls_hostname:
+        vars:
+            - name: ansible_docker_tls_hostname
+    api_version:
+        vars:
+            - name: ansible_docker_api_version
+    timeout:
+        vars:
+            - name: ansible_docker_timeout
+    ca_cert:
+        vars:
+            - name: ansible_docker_ca_cert
+    client_cert:
+        vars:
+            - name: ansible_docker_client_cert
+    client_key:
+        vars:
+            - name: ansible_docker_client_key
+    ssl_version:
+        vars:
+            - name: ansible_docker_ssl_version
+    tls:
+        vars:
+            - name: ansible_docker_tls
+    validate_certs:
+        vars:
+            - name: ansible_docker_validate_certs
+'''
+
     # Additional, more specific stuff for minimal Docker SDK for Python version < 2.0
 
     DOCKER_PY_1_DOCUMENTATION = r'''

plugins/inventory/docker_containers.py

@@ -44,6 +44,8 @@ options:
               R(docker connection plugin,ansible_collections.community.docker.docker_connection),
               and C(docker-api) selects the
               R(docker_api connection plugin,ansible_collections.community.docker.docker_api_connection).
+            - When C(docker-api) is used, all Docker daemon configuration values are passed from the inventory plugin
+              to the connection plugin. This can be controlled with I(configure_docker_daemon).
         type: str
         default: docker-api
         choices:
@@ -51,6 +53,14 @@ options:
             - docker-cli
             - docker-api
 
+    configure_docker_daemon:
+        description:
+            - Whether to pass all Docker daemon configuration from the inventory plugin to the connection plugin.
+            - Only used when I(connection_type=docker-api).
+        type: bool
+        default: true
+        version_added: 1.8.0
+
     verbose_output:
         description:
             - Toggle to (not) include all available inspection metadata.
@@ -138,6 +148,7 @@ from ansible.plugins.inventory import BaseInventoryPlugin, Constructable
 
 from ansible_collections.community.docker.plugins.module_utils.common import (
     RequestException,
+    DOCKER_COMMON_ARGS_VARS,
 )
 from ansible_collections.community.docker.plugins.plugin_utils.common import (
     AnsibleDockerClient,
@@ -180,6 +191,13 @@ class InventoryModule(BaseInventoryPlugin, Constructable):
             self.inventory.add_group('running')
             self.inventory.add_group('stopped')
 
+        extra_facts = {}
+        if self.get_option('configure_docker_daemon'):
+            for option_name, var_name in DOCKER_COMMON_ARGS_VARS.items():
+                value = self.get_option(option_name)
+                if value is not None:
+                    extra_facts[var_name] = value
+
         for container in containers:
             id = container.get('Id')
             short_id = id[:13]
@@ -256,6 +274,7 @@ class InventoryModule(BaseInventoryPlugin, Constructable):
                     ansible_host=full_name,
                     ansible_connection='community.docker.docker_api',
                 ))
+                facts.update(extra_facts)
 
             full_facts.update(facts)
             for key, value in inspect.items():

plugins/module_utils/common.py

@@ -96,6 +96,12 @@ DOCKER_COMMON_ARGS = dict(
     debug=dict(type='bool', default=False)
 )
 
+DOCKER_COMMON_ARGS_VARS = dict([
+    [option_name, 'ansible_docker_%s' % option_name]
+    for option_name in DOCKER_COMMON_ARGS
+    if option_name != 'debug'
+])
+
 DOCKER_MUTUALLY_EXCLUSIVE = []
 
 DOCKER_REQUIRED_TOGETHER = [