Add facter cache for container configurations

Rather than running all the facts for every invocation of
container-puppet.py, let's cache the facts for the entire container
config step.  This is similar to what used to happen when we ran puppet
in a single instance for a given step. This improves the time it takes
puppet tp execute within the containers. When systems have large number
of interfaces, the fact generation for puppet can come to a crawl given
that puppet is not supposed to be invoked multiple times in parallel. By
pre-caching the facts, we eliminate the need for puppet to do the
network (and other fact) related lookups when running container
configuration generation.

Closes-Bug: #1835959
Change-Id: I6ee3849ff380304a184638493f33882b813bfdff

common/container-puppet.py

@@ -436,6 +436,9 @@ def mp_puppet_config(*args):
                 '--volume', '/etc/pki/tls/certs/ca-bundle.trust.crt:/etc/pki/tls/certs/ca-bundle.trust.crt:ro',
                 '--volume', '/etc/pki/tls/cert.pem:/etc/pki/tls/cert.pem:ro',
                 '--volume', '%s:/var/lib/config-data/:rw' % config_volume_prefix,
+                # facter caching
+                '--volume', '/var/lib/container-puppet/puppetlabs/facter.conf:/etc/puppetlabs/facter/facter.conf:ro',
+                '--volume', '/var/lib/container-puppet/puppetlabs/:/opt/puppetlabs/:ro',
                 # Syslog socket for puppet logs
                 '--volume', '/dev/log:/dev/log:rw']
         if privileged:

common/deploy-steps-tasks.yaml

@@ -421,6 +421,60 @@
         - host_config
       ignore_errors: "{{ ansible_check_mode|bool }}"
 
+    #########################################
+    # Pre-cache facts for container-puppet.py
+    #########################################
+
+    - name: Create puppet caching structures
+      file:
+        path: /var/lib/container-puppet/puppetlabs
+        state: directory
+        setype: svirt_sandbox_file_t
+        selevel: s0
+        recurse: True
+      tags:
+        - container_config
+        - container_config_tasks
+    - name: Write facter cache config
+      copy:
+        dest: /var/lib/container-puppet/puppetlabs/facter.conf
+        content: |
+          facts : {
+            ttls: [
+              { "kernel" : 8 hour },
+              { "memory" : 8 hour },
+              { "networking" : 8 hour },
+              { "operating system" : 8 hour },
+              { "processor" : 8 hour },
+            ]
+          }
+      tags:
+        - container_config
+        - container_config_tasks
+    - name: Cleanup facter cache if exists
+      file:
+        path: /opt/puppetlabs/facter
+        state: absent
+      ignore_errors: True
+      tags:
+        - container_config
+        - container_config_tasks
+    - name: Pre-cache facts
+      command: facter --config /var/lib/container-puppet/puppetlabs/facter.conf
+      no_log: True
+      ignore_errors: True
+      tags:
+        - container_config
+        - container_config_tasks
+    - name: Sync cached facts
+      synchronize:
+        src: /opt/puppetlabs/
+        dest: /var/lib/container-puppet/puppetlabs/
+      delegate_to: "{{ inventory_hostname }}"
+      tags:
+        - container_config
+        - container_config_tasks
+
     ######################################
     # Generate config via container-puppet.py
     ######################################