Update installation mechanism

The following adjustments are made in order to modernise
bring the role into line with the other mainline roles:

1. Simplify the constraints mechanism.

2. Add the developer mode constraints functionality.

3. Clean up developer mode logic to allow pip installs
   into an existing venv if the deployer chooses to do so.

4. Normalise the distro package install task to make it
   use the same name, to add retries and ensure that the
   cache updates appropriately.

5. Clean up some commented vars and tasks which were not
   used.

6. Simplify the use of checksums for the venv downloads
   to use modern Ansible functionality.

7. Add additional python venv prep for SuSE/CentOS.

8. Add the recording of the current venv tag deployed.

Change-Id: I9daa4352aa818db03f682eb0d1a65eefff9bb6f6

defaults/main.yml

@@ -27,18 +27,13 @@ tacker_pip_package_state: "latest"
 
 tacker_git_repo: https://git.openstack.org/openstack/tacker
 tacker_git_install_branch: master
-tacker_requirements_git_repo: https://git.openstack.org/openstack/requirements
-tacker_requirements_git_install_branch: master
 tacker_developer_mode: false
 tacker_developer_constraints:
   - "git+{{ tacker_git_repo }}@{{ tacker_git_install_branch }}#egg=tacker"
 
-#tacker_venv_enabled: true
-
 # Name of the virtual env to deploy into
 tacker_venv_tag: untagged
 tacker_bin: "/openstack/venvs/tacker-{{ tacker_venv_tag }}/bin"
-#tacker_venv_bin: "/openstack/venvs/tacker-{{ tacker_venv_tag }}/bin"
 
 # Set the etc dir path where tacker is installed.
 #  This is used for role access to the db migrations.
@@ -46,6 +41,9 @@ tacker_bin: "/openstack/venvs/tacker-{{ tacker_venv_tag }}/bin"
 #  tacker_etc_dir: "/usr/local/etc/tacker"
 tacker_etc_dir: "/etc/tacker"
 
+# venv_download, even when true, will use the fallback method of building the
+# venv from scratch if the venv download fails.
+tacker_venv_download: "{{ not tacker_developer_mode | bool }}"
 tacker_venv_download_url: http://127.0.0.1/venvs/untagged/ubuntu/tacker.tgz
 
 

tasks/tacker_install.yml

@@ -15,10 +15,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-- name: Install tacker packages
+- name: Install distro packages
   package:
     name: "{{ tacker_distro_packages }}"
     state: "{{ tacker_package_state }}"
+    update_cache: "{{ (ansible_pkg_mgr in ['apt', 'zypper']) | ternary('yes', omit) }}"
+    cache_valid_time: "{{ (ansible_pkg_mgr == 'apt') | ternary(cache_timeout, omit) }}"
+  register: install_packages
+  until: install_packages|success
+  retries: 5
+  delay: 2
 
 - name: Create developer mode constraint file
   copy:
@@ -30,65 +36,34 @@
   when:
     - tacker_developer_mode | bool
 
-- name: Clone requirements git repository
-  git:
-    repo: "{{ tacker_requirements_git_repo }}"
-    dest: "/opt/requirements"
-    clone: yes
-    update: yes
-    version: "{{ tacker_requirements_git_install_branch }}"
-  when:
-    - tacker_developer_mode | bool
-
-- name: Add constraints to pip_install_options fact for developer mode
-  set_fact:
-    pip_install_options_fact: "{{ pip_install_options|default('') }} --constraint /opt/developer-pip-constraints.txt --constraint /opt/requirements/upper-constraints.txt"
-  when:
-    - tacker_developer_mode | bool
-
-- name: Set pip_install_options_fact when not in developer mode
-  set_fact:
-    pip_install_options_fact: "{{ pip_install_options|default('') }}"
-  when:
-    - not tacker_developer_mode | bool
-
 - name: Install requires pip packages
   pip:
-    name: "{{ tacker_requires_pip_packages | join(' ') }}"
+    name: "{{ tacker_requires_pip_packages }}"
     state: "{{ tacker_pip_package_state }}"
-    extra_args: "{{ pip_install_options_fact }}"
+    extra_args: >-
+      {{ tacker_developer_mode | ternary(pip_install_developer_constraints | default('--constraint /opt/developer-pip-constraints.txt'), '') }}
+      {{ (pip_install_upper_constraints is defined) | ternary('--constraint ' + pip_install_upper_constraints | default(''),'') }}
+      {{ pip_install_options | default('') }}
   register: install_packages
   until: install_packages|success
   retries: 5
   delay: 2
-  tags:
-    - skip_ansible_lint
 
-- name: Get local venv checksum
-  stat:
-    path: "/var/cache/{{ tacker_venv_download_url | basename }}"
-    get_md5: False
-  when:
-    - not tacker_developer_mode | bool
-  register: local_venv_stat
-
-- name: Get remote venv checksum
+- name: Retrieve checksum for venv download
   uri:
     url: "{{ tacker_venv_download_url | replace('tgz', 'checksum') }}"
-    return_content: True
-  when:
-    - not tacker_developer_mode | bool
+    return_content: yes
   register: tacker_venv_checksum
+  when: tacker_venv_download | bool
 
 - name: Attempt venv download
   get_url:
     url: "{{ tacker_venv_download_url }}"
     dest: "/var/cache/{{ tacker_venv_download_url | basename }}"
     checksum: "sha1:{{ tacker_venv_checksum.content | trim }}"
-  ignore_errors: true
   register: tacker_get_venv
   when:
-    - not tacker_developer_mode | bool
+    - tacker_venv_download | bool
 
 - name: Remove existing venv
   file:
@@ -102,6 +77,8 @@
     path: "{{ tacker_bin | dirname }}"
     state: directory
   register: tacker_venv_dir
+  when:
+    - tacker_get_venv | changed
 
 - name: Unarchive pre-built venv
   unarchive:
@@ -109,28 +86,36 @@
     dest: "{{ tacker_bin | dirname }}"
     copy: "no"
   when:
-    - not tacker_developer_mode | bool
-    - tacker_get_venv | changed or tacker_venv_dir | changed
+    - tacker_get_venv | changed
   notify:
     - Restart tacker services
 
 - name: Install pip packages
   pip:
-    name: "{{ tacker_pip_packages | join(' ') }}"
+    name: "{{ tacker_pip_packages }}"
     state: "{{ tacker_pip_package_state }}"
     virtualenv: "{{ tacker_bin | dirname }}"
     virtualenv_site_packages: "no"
-    extra_args: "{{ pip_install_options_fact }}"
+    extra_args: >-
+      {{ tacker_developer_mode | ternary(pip_install_developer_constraints | default('--constraint /opt/developer-pip-constraints.txt'), '') }}
+      {{ (pip_install_upper_constraints is defined) | ternary('--constraint ' + pip_install_upper_constraints | default(''),'') }}
+      {{ pip_install_options | default('') }}
   register: install_packages
   until: install_packages|success
   retries: 5
   delay: 2
   when:
-    - tacker_get_venv | failed or tacker_developer_mode | bool
+    - tacker_get_venv | failed or tacker_get_venv | skipped
   notify:
     - Restart tacker services
-  tags:
-    - skip_ansible_lint
+
+- name: Remove python from path first (CentOS, openSUSE)
+  file:
+    path:  "{{ tacker_bin | dirname }}/bin/python2.7"
+    state: "absent"
+  when:
+    - ansible_pkg_mgr in ['yum', 'dnf', 'zypper']
+    - tacker_get_venv | changed
 
 - name: Update virtualenv path
   shell: |
@@ -140,5 +125,11 @@
   tags:
     - skip_ansible_lint
   when:
-    - not tacker_developer_mode | bool
-    - tacker_get_venv | success
+    - tacker_get_venv | changed
+
+- name: Record the venv tag deployed
+  ini_file:
+    dest: "/etc/ansible/facts.d/openstack_ansible.fact"
+    section: tacker
+    option: venv_tag
+    value: "{{ tacker_venv_tag }}"

tasks/tacker_post_install.yml

@@ -15,22 +15,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-#- name: Get tacker command path
-  #command: which {{ tacker_program_name }}
-  #register: tacker_command_path
-  #when:
-    #- not tacker_venv_enabled | bool
-  #tags:
-    #- tacker-command-bin
-
-#- name: Set tacker command path
-  #set_fact:
-    #tacker_bin: "{{ tacker_command_path.stdout | dirname }}"
-  #when:
-    #- not tacker_venv_enabled | bool
-  #tags:
-    #- tacker-command-bin
-
 - name: Drop tacker Config(s)
   config_template:
     src: "{{ item.src }}"