Backup and restore of Salt master's state: pki and generated metadata

Change-Id: I5c88d22589ec1fa6a9806c1a625b752dd4fc8b54

README.rst

           ".*":
           - x509.sign_remote_certificate
 
+
+Salt master backup configuration
+
+.. code-block:: yaml
+
+    salt:
+      master:
+        backup: true
+        initial_data:
+          engine: backupninja
+          source: backup-node-host
+          host: original-salt-master-id
+
 Configure verbosity of state output (used for `salt` command)
 
 .. code-block:: yaml

salt/files/restore.sh

+#!/bin/sh
+{%- from "salt/map.jinja" import master with context %}
+
+{%- if master.initial_data is defined %}
+mv /etc/salt/pki/* /etc/salt/pki.bak
+scp -r backupninja@{{ master.initial_data.source }}:/srv/backupninja/{{ master.initial_data.host }}/etc/salt/pki/pki.0/* /etc/salt/pki
+{%- if master.pillar.engine == 'reclass' or (master.pillar.engine == 'composite' and master.pillar.reclass is defined) %}
+scp -r backupninja@{{ master.initial_data.source }}:/srv/backupninja/{{ master.initial_data.host }}/srv/salt/reclass/nodes/_generated/_generated.0/* /srv/salt/reclass/nodes/_generated
+{%- endif %}
+{%- endif %}

salt/master/restore.sls

+{%- from "salt/map.jinja" import master with context %}
+{%- if master.enabled %}
+
+{%- if master.initial_data is defined %}
+
+/srv/salt/restore.sh:
+  file:
+  - managed
+  - source: salt://salt/files/restore.sh
+  - mode: 700
+  - template: jinja
+
+salt_master_restore_state:
+  cmd.run:
+  - name: /srv/salt/restore.sh
+  - unless: "test -e /srv/salt/master-restored"
+  - cwd: /root
+  - require:
+    - file: /srv/salt/restore.sh
+
+salt_master_restore_completed:
+  file.managed:
+  - name: /srv/salt/master-restored
+  - source: {}
+  - require:
+    - cmd: salt_master_restore_state
+
+{%- endif %}
+
+{%- endif %}

salt/meta/backupninja.yml

   {%- from "salt/map.jinja" import master with context %}
 backup:
   salt:
+    {%- if master.get('backup', False) %}
     fs_includes:
-    - /srv/salt
-    - /etc/salt
+    {%- if master.pillar.engine == 'reclass' or (master.pillar.engine == 'composite' and master.pillar.reclass is defined) %}
+    - /srv/salt/reclass/nodes/_generated
+    {%- endif %}
+    - /etc/salt/pki
+    {%- else %}
+    fs_includes: []
+    {%- endif %}
     fs_excludes: []
 {%- endif %}

tests/pillar/master_backup.sls

+git:
+  client:
+    enabled: true
+linux:
+  system:
+    enabled: true
+salt:
+  master:
+    enabled: true
+    source:
+      engine: pkg
+    pillar:
+      engine: salt
+      source:
+        engine: local
+    environment:
+      prd:
+        formula: {}
+    initial_data:
+      engine: backupninja
+      source: backup-node-host
+      host: original-salt-master-id