Add save_ansible_facts.yml playbook for saving facts "in-tree"

docs/usage.md

@@ -7,6 +7,11 @@ First, generate Ansible output for your hosts:
     mkdir out
     ansible -m setup --tree out/ all
 
+In case you want to generate Ansible facts output in your existing
+playbooks, you can use/include the
+[save_ansible_facts.yml](https://github.com/fboender/ansible-cmdb/blob/master/example/playbooks/save_ansible_facts.yml)
+playbook which is provided in the examples.
+
 Next, call ansible-cmdb on the resulting `out/` directory to generate the CMDB
 overview page:
 
@@ -401,4 +406,3 @@ Generate the overview:
     ./ansible-cmdb out/ out_custom/ > overview.html
 
 The software items will be listed under the "*Custom facts*" heading.
-

example/playbooks/save_ansible_facts.yml

@@ -0,0 +1,21 @@
+---
+# .. vim: foldmarker=[[[,]]]:foldmethod=marker
+
+- name: Save Ansible facts
+  hosts: [ 'all_managed_hosts' ]
+  become: False
+  gather_facts: False
+
+  tasks:
+
+    - name: Write Ansible facts to facts directory
+      command: ansible -m setup --tree {{ inventory_facts_path|d((inventory_dir | realpath) + "/../../facts") | quote }} {{ inventory_hostname }} --become
+      become: False
+      delegate_to: 'localhost'
+
+    - name: Remove often changing facts to make facts deterministic and suitable to be put under version control
+      shell: jq '{{ inventory_facts_jq_filter|d("del(.ansible_facts.ansible_date_time, .ansible_facts.ansible_env.SUDO_COMMAND, .ansible_facts.ansible_uptime_seconds)") }}' --sort-keys {{ (inventory_hostname) | quote }} > {{ (inventory_hostname + ".tmp") | quote }} && mv {{ (inventory_hostname + ".tmp") | quote }} {{ (inventory_hostname) | quote }};
+      args:
+        chdir: '{{ inventory_facts_path|d((inventory_dir | realpath) + "/../../facts") }}'
+      become: False
+      delegate_to: 'localhost'