Initial import of the WIP plugin

example/00-data.yml

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+all:
+  hosts:
+
+    localhost:
+
+    # All of this should obviously come from some other inventory plugin.
+
+    evil-vm:
+      inv__data:
+        network: death
+        service: evil
+        instance: chaos
+
+    vm00:
+      inv__data:
+        network: dev
+        service: ldap
+        instance: dev
+        component: front
+        fostack: 1
+    vm01:
+      inv__data:
+        network: dev
+        service: ldap
+        instance: dev
+        component: front
+        fostack: 2
+    vm02:
+      inv__data:
+        network: dev
+        service: ldap
+        instance: dev
+        component: back
+        subcomponent: ro
+        fostack: 1
+    vm03:
+      inv__data:
+        network: dev
+        service: ldap
+        instance: dev
+        component: back
+        subcomponent: ro
+        fostack: 2
+    vm04:
+      inv__data:
+        network: dev
+        service: ldap
+        instance: dev
+        component: back
+        subcomponent: rw
+
+    vm05:
+      inv__data:
+        network: infra
+        service: ldap
+        instance: prod
+        component: front
+        fostack: 1
+    vm06:
+      inv__data:
+        network: infra
+        service: ldap
+        instance: prod
+        component: front
+        fostack: 2
+    vm07:
+      inv__data:
+        network: infra
+        service: ldap
+        instance: prod
+        component: back
+        subcomponent: ro
+        fostack: 1
+    vm08:
+      inv__data:
+        network: infra
+        service: ldap
+        instance: prod
+        component: back
+        subcomponent: ro
+        fostack: 2
+    vm09:
+      inv__data:
+        network: infra
+        service: ldap
+        instance: dev
+        component: back
+        subcomponent: rw

example/01-test-reconstructed.yml

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+---
+plugin: reconstructed
+instructions:
+
+  # Check whether that host is managed
+  - action: set_fact
+    name: inv__managed
+    value: >-
+      {{ inv__data is defined
+         and inv__data.network is defined
+         and inv__data.service is defined
+         and inv__data.instance is defined }}
+  - when: not inv__managed
+    action: stop
+
+  # Fail when the host name starts with "evil".
+  - when: inventory_hostname.startswith( 'evil' )
+    action: fail
+    msg: "{{ inventory_hostname }} is obviously evil, skipping."
+
+  # Only create the managed groups if we *have* managed hosts
+  - loop: [managed, by_environment, by_network, by_failover_stack, by_service]
+    action: create_group
+    group: "{{ item }}"
+  - loop: [by_environment, by_network, by_failover_stack, by_service]
+    action: add_child
+    group: managed
+    child: "{{ item }}"
+
+  # Copy inv__data fields to separate inv__ variables
+  - loop:
+      - component
+      - description
+      - fostack
+      - instance
+      - network
+      - service
+      - subcomponent
+    when: inv__data[item] is defined
+    action: set_fact
+    name: "inv__{{ item }}"
+    value: "{{ inv__data[ item ] }}"
+
+  # Environment variable and groups
+  - action: set_fact
+    name: inv__environment
+    value: >-
+      {{
+        inv__data.environment | default(
+          ( inv__instance == "prod" ) | ternary( "prod", "dev" )
+        )
+      }}
+  - action: create_group
+    group: "env_{{ inv__environment }}"
+  - action: add_child
+    group: by_environment
+    child: "env_{{ inv__environment }}"
+  - action: add_host
+    group: "env_{{ inv__environment }}"
+
+  # Failover stack group
+  - action: set_var
+    name: failover_group
+    value: >-
+      {{
+        ( inv__fostack is defined )
+        | ternary( "fostack_" ~ inv__fostack | default("") , "no_failover" )
+      }}
+  - action: create_group
+    group: "{{ failover_group }}"
+  - action: add_child
+    group: by_failover_stack
+    child: "{{ failover_group }}"
+  - action: add_host
+    group: "{{ failover_group }}"
+
+  # Network group
+  - action: set_var
+    name: network_group
+    value: "net_{{ inv__network }}"
+  - action: create_group
+    group: "{{ network_group }}"
+  - action: add_child
+    group: by_network
+    child: "{{ network_group }}"
+  - action: add_host
+    group: "{{ network_group }}"
+
+  # Service group
+  - action: set_var
+    name: service_group
+    value: "svc_{{ inv__service }}"
+  - action: create_group
+    group: "{{ service_group }}"
+  - action: add_child
+    group: by_service
+    child: "{{ service_group }}"
+
+  # Component group. We add the host directly if there is no subcomponent.
+  - when: inv__component is defined
+    action: set_var
+    name: comp_group
+    value: "svcm_{{ inv__service }}_{{ inv__component }}"
+  - when: inv__component is defined
+    action: create_group
+    group: "{{ comp_group }}"
+  - when: inv__component is defined
+    action: add_child
+    group: "{{ service_group }}"
+    child: "{{ comp_group }}"
+  - when: inv__component is defined and inv__subcomponent is not defined
+    action: add_host
+    group: "{{ comp_group }}"
+
+  # Subcomponent group.
+  - when: inv__component is defined and inv__subcomponent is defined
+    action: set_var
+    name: subcomp_group
+    value: "svcm_{{ inv__service }}_{{ inv__subcomponent }}"
+  - when: inv__component is defined and inv__subcomponent is defined
+    action: create_group
+    group: "{{ subcomp_group }}"
+  - when: inv__component is defined and inv__subcomponent is defined
+    action: add_child
+    group: "{{ comp_group }}"
+    child: "{{ subcomp_group }}"
+  - when: inv__component is defined and inv__subcomponent is defined
+    action: add_host
+    group: "{{ subcomp_group }}"