Add linux.system.apt state

Change-Id: I1e190f1f5b34a049335efbecffad3dddf7c41644

README.rst

       system:
         purge_repos: true
 
+Setup custom apt config options:
+
+.. code-block:: yaml
+
+    linux:
+      system:
+        apt:
+          config:
+            compression-workaround:
+              "Acquire::CompressionTypes::Order": "gz"
+            docker-clean:
+              "DPkg::Post-Invoke":
+                - "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"
+              "APT::Update::Post-Invoke":
+                - "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"
 
 RC
 ~~

linux/files/apt.conf

+// apt.conf file managed by salt-minion
+// DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
+
+{%- for key, value in config.iteritems() %}
+{{ key }} {% if value is iterable and value is not string %}{ {% for entry in value %}"{{ entry }}";{% endfor %} } {% else %}{{ value }};{% endif %}
+{%- endfor %}
+{#-
+vim: syntax=jinja
+-#}

linux/system/apt.sls

+{%- from "linux/map.jinja" import system with context %}
+{%- if system.enabled %}
+{%- if grains.os_family == 'Debian' %}
+
+{%- if system.repo|length > 0 %}
+include:
+- linux.system.repo
+{%- endif %}
+
+{%- for key, config in system.apt.get('config', {}).iteritems() %}
+
+linux_apt_conf_{{ key }}
+  file.managed:
+  - name: /etc/apt/apt.conf.d/99{{ key }}-salt:
+  - template: jinja
+  - source: salt://linux/files/apt.conf
+  - defaults:
+      config: {{ config|yaml }}
+  {%- if system.repo|length > 0 %}
+  - require_in:
+    - pkg: linux_repo_prereq_pkgs
+  {%- endif %}
+
+{%- endfor %}
+
+{%- endif %}
+{%- endif %}

linux/system/init.sls

 {%- if system.directory is defined %}
 - linux.system.directory
 {%- endif %}
+{%- if system.apt is defined and grains.os_family == 'Debian' %}
+- linux.system.apt
+{%- endif %}