Implement shippable venvs

The change builds venvs in a single repo container and then
ships them to to all targets. The built venvs will be within
the repo servers and will allow for faster deployments,
upgrades, and more consistent deployments for the life cycle
of the deployment.

This will create a versioned tarball that will allow for
greater visablility into the build process as well as giving
deployers/developers the ability to compair a release in
place.

Change-Id: Ieef0b89ebc009d1453c99e19e53a36eb2d70edae
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

defaults/main.yml

@@ -29,6 +29,8 @@ horizon_venv_enabled: true
 #  system path used when the installing.
 horizon_bin: "{{ horizon_venv_bin }}"
 
+horizon_venv_download_url: http://127.0.0.1/venvs/untagged/ubuntu/horizon.tgz
+
 ## System info
 horizon_system_user_name: horizon
 horizon_system_group_name: www-data
@@ -137,6 +139,7 @@ horizon_apt_packages:
 # horizon packages that must be installed before anything else
 horizon_requires_pip_packages:
   - virtualenv
+  - virtualenv-tools
   - python-keystoneclient # Keystoneclient needed to OSA keystone lib
 
 horizon_pip_packages:

tasks/horizon_install.yml

@@ -50,7 +50,9 @@
   delay: 2
   with_items:
     - "{{ horizon_pip_packages }}"
-  when: horizon_venv_enabled | bool
+  when:
+    - horizon_venv_enabled | bool
+    - horizon_get_venv | failed
   tags:
     - horizon-pip-packages
 

tasks/horizon_pre_install.yml

@@ -71,6 +71,58 @@
   tags:
     - horizon-pip-packages
 
+- name: Attempt venv download
+  get_url:
+    url: "{{ horizon_venv_download_url }}"
+    dest: "/var/cache/{{ horizon_venv_download_url | basename }}"
+  ignore_errors: true
+  register: get_venv
+  when: horizon_venv_enabled | bool
+  tags:
+    - horizon-install
+    - horizon-pip-packages
+
+- name: Set horizon get_venv fact
+  set_fact:
+    horizon_get_venv: "{{ get_venv }}"
+  when: horizon_venv_enabled | bool
+  tags:
+    - horizon-install
+    - horizon-pip-packages
+
+- name: Create horizon venv dir
+  file:
+    path: "{{ horizon_venv_bin | dirname }}"
+    state: directory
+  when:
+    - horizon_venv_enabled | bool
+    - horizon_get_venv | success
+  tags:
+    - horizon-install
+    - horizon-pip-packages
+
+- name: Unarchive pre-built venv
+  unarchive:
+    src: "/var/cache/{{ horizon_venv_download_url | basename }}"
+    dest: "{{ horizon_venv_bin | dirname }}"
+    copy: "no"
+  when:
+    - horizon_venv_enabled | bool
+    - horizon_get_venv | success
+  tags:
+    - horizon-install
+    - horizon-pip-packages
+
+- name: Update virtualenv path
+  command: >
+    virtualenv-tools --update-path=auto {{ horizon_venv_bin | dirname }}
+  when:
+    - horizon_venv_enabled | bool
+    - horizon_get_venv | success
+  tags:
+    - horizon-install
+    - horizon-pip-packages
+
 - name: Create horizon venv
   pip:
     name: "{{ item }}"
@@ -80,8 +132,11 @@
     extra_args: "{{ pip_install_options|default('') }}"
   with_items:
     - "{{ horizon_requires_pip_packages }}"
-  when: horizon_venv_enabled | bool
+  when:
+    - horizon_venv_enabled | bool
+    - horizon_get_venv | failed
   tags:
+    - horizon-install
     - horizon-pip-packages
 
 - name: Create horizon links for venv
@@ -96,6 +151,7 @@
       dest: "{{ horizon_lib_dir }}"
   when: horizon_venv_enabled | bool
   tags:
+    - horizon-install
     - horizon-configs
 
 - name: Create static horizon dir