Implement aodh venv support

This commit conditionally allows the os_aodh role to
install build and deploy within a venv. This is the new
default behavior of the role however the functionality
can be disabled.

Change-Id: I9f9e09b2a68e843da1d92a782cd29fc563379a6d
Implements: blueprint enable-venv-support-within-the-roles
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

defaults/main.yml

@@ -17,6 +17,18 @@
 debug: False
 verbose: False
 
+# Name of the virtual env to deploy into
+aodh_venv_tag: untagged
+aodh_venv_bin: "/openstack/venvs/aodh-{{ aodh_venv_tag }}/bin"
+
+# Set this to enable or disable installing in a venv
+aodh_venv_enabled: true
+
+# The bin path defaults to the venv path however if installation in a
+#  venv is disabled the bin path will be dynamically set based on the
+#  system path used when the installing.
+aodh_bin: "{{ aodh_venv_bin }}"
+
 ## System info
 aodh_system_user_name: aodh
 aodh_system_group_name: aodh
@@ -70,6 +82,11 @@ aodh_service_adminurl: "{{ aodh_service_adminuri }}"
 aodh_apt_packages:
   - rpcbind
 
+# aodh packages that must be installed before anything else
+aodh_requires_pip_packages:
+  - virtualenv
+  - python-keystoneclient # Keystoneclient needed to OSA keystone lib
+
 # Common pip packages
 aodh_pip_packages:
   - aodh

tasks/aodh_install.yml

@@ -25,10 +25,43 @@
   delay: 2
   with_items: aodh_apt_packages
   tags:
+    - aodh-install
     - aodh-apt-packages
 
+- name: Install requires pip packages
+  pip:
+    name: "{{ item }}"
+    state: present
+    extra_args: "{{ pip_install_options|default('') }}"
+  register: install_packages
+  until: install_packages|success
+  retries: 5
+  delay: 2
+  with_items:
+    - "{{ aodh_requires_pip_packages }}"
+  tags:
+    - aodh-install
+    - aodh-pip-packages
 
-- name: Install pip packages
+- name: Install pip packages (venv)
+  pip:
+    name: "{{ item }}"
+    state: present
+    virtualenv: "{{ aodh_venv_bin | dirname }}"
+    virtualenv_site_packages: "no"
+    extra_args: "{{ pip_install_options|default('') }}"
+  register: install_packages
+  until: install_packages|success
+  retries: 5
+  delay: 2
+  with_items:
+    - "{{ aodh_pip_packages }}"
+  when: aodh_venv_enabled | bool
+  tags:
+    - aodh-install
+    - aodh-pip-packages
+
+- name: Install pip packages (no venv)
   pip:
     name: "{{ item }}"
     state: present
@@ -39,5 +72,7 @@
   delay: 2
   with_items:
     - "{{ aodh_pip_packages }}"
+  when: not aodh_venv_enabled | bool
   tags:
+    - aodh-install
     - aodh-pip-packages

tasks/aodh_post_install.yml

@@ -13,6 +13,22 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+- name: Get aodh command path
+  command: which aodh
+  register: aodh_command_path
+  when:
+    - not aodh_venv_enabled | bool
+  tags:
+    - aodh-command-bin
+
+- name: Set aodh command path
+  set_fact:
+    aodh_bin: "{{ aodh_command_path.stdout | dirname }}"
+  when:
+    - not aodh_venv_enabled | bool
+  tags:
+    - aodh-command-bin
+
 - name: Copy aodh config
   config_template:
     src: "{{ item.src }}"
@@ -39,4 +55,3 @@
   tags:
     - aodh-config
     - aodh-post-install
-

tasks/aodh_pre_install.yml

@@ -48,6 +48,17 @@
   tags:
     - aodh-dirs
 
+- name: Create aodh venv dir
+  file:
+    path: "{{ item.path }}"
+    state: directory
+  with_items:
+    - { path: "/openstack/venvs" }
+    - { path: "{{ aodh_venv_bin }}" }
+  when: aodh_venv_enabled | bool
+  tags:
+    - aodh-dirs
+
 - name: Test for log directory or link
   shell: |
     if [ -h "/var/log/aodh"  ]; then

templates/aodh-upstart-init.j2

@@ -12,7 +12,7 @@ respawn
 respawn limit 10 5
 
 # Set the RUNBIN environment variable
-env RUNBIN="/usr/local/bin/{{ program_name }}"
+env RUNBIN="{{ aodh_bin }}/{{ program_name }}"
 
 # Change directory to service users home
 chdir "{{ service_home }}"
@@ -24,6 +24,11 @@ pre-start script
 
   mkdir -p "/var/lock/{{ program_name }}"
   chown {{ system_user }}:{{ system_group }} "/var/lock/{{ program_name }}"
+
+  {% if aodh_venv_enabled | bool -%}
+  . {{ aodh_bin }}/activate
+  {%- endif %}
+
 end script
 
 # Post stop actions