ceph-container-common: modify requirement flow

Until now it was not possible to install a specific container package
because it was somehow hardcoded.
This patch allows to override the container package name (docker.io
vs docker-ce) and refacts the package installation. This could be
achieve via the container_package_name variable.
Instead of using one task per distribution we can set the package and
service name in vars. This allows to have a unified package task.
Also refactorize the debian_prerequisites tasks because the content
was outdated.

https://docs.docker.com/install/linux/docker-ce/debian/
https://docs.docker.com/install/linux/docker-ce/ubuntu/

Resolves: #3609

Signed-off-by: Dimitri Savineau <dsavinea@redhat.com>

roles/ceph-container-common/tasks/pre_requisites/debian_prerequisites.yml

@@ -1,70 +1,22 @@
 ---
+- name: uninstall old docker versions
+  package:
+    name: ['docker', 'docker-engine', 'docker.io', 'containerd', 'runc']
+    state: absent
+
 - name: allow apt to use a repository over https (debian)
   package:
-    name: ['apt-transport-https', 'ca-certificates', 'curl', 'software-properties-common']
-    state: present
+    name: ['apt-transport-https', 'ca-certificates', 'software-properties-common']
     update_cache: yes
   register: result
   until: result is succeeded
 
 - name: add docker's gpg key
   apt_key:
-    url: https://apt.dockerproject.org/gpg
-    state: present
+    url: 'https://download.docker.com/linux/{{ ansible_distribution | lower }}/gpg'
   register: result
   until: result is succeeded
 
-- name: add docker and debian testing repository
+- name: add docker repository
   apt_repository:
-    repo: "{{ item }}"
-    state: present
-    update_cache: no
-  register: add_docker_apt_repo
-  with_items:
-    - "deb https://apt.dockerproject.org/repo/ debian-{{ ansible_distribution_release }} main"
-    - "deb http://http.us.debian.org/debian/ testing contrib main"
-
-- name: update apt cache
-  apt:
-    update_cache: yes
-  when: add_docker_apt_repo | changed
-  register: update_docker_apt_cache
-  until: update_docker_apt_cache | success
-  retries: 5
-  delay: 2
-
-- name: install pip from testing on debian
-  package:
-    name: python-pip
-    state: present
-    default_release: testing
-    update_cache: yes
-  register: result
-  until: result is succeeded
-
-- name: install docker-py via pip for debian
-  pip:
-    name: docker-py
-    state: latest
-  register: result
-  until: result is succeeded
-  tags:
-    - skip_ansible_lint
-
-
-- name: install docker on debian
-  package:
-    name: "{{ 'docker-ce' if ansible_architecture == 'aarch64' else 'docker-engine' }}"
-    state: present
-    update_cache: yes
-  register: result
-  until: result is succeeded
-
-# NOTE (jimcurtis): need at least version 1.9.0 of six or we get:
-# re:NameError: global name 'DEFAULT_DOCKER_API_VERSION' is not defined
-- name: install six via pip
-  pip:
-    name: six
-    version: 1.9.0
-  register: result
-  until: result is succeeded
+    repo: "deb https://download.docker.com/linux/{{ ansible_distribution | lower}} {{ ansible_distribution_release }} stable"

roles/ceph-container-common/tasks/pre_requisites/prerequisites.yml

@@ -1,46 +1,20 @@
 ---
+- name: include specific variables
+  include_vars: "{{ item }}"
+  with_first_found:
+    - "{{ ansible_distribution }}-{{ ansible_distribution_major_version }}.yml"
+    - "{{ ansible_os_family }}.yml"
+
 - name: include remove_ceph_udev_rules.yml
   include_tasks: remove_ceph_udev_rules.yml
 
 - name: debian based systems tasks
-  when:
-    - ansible_distribution == 'Debian'
-  block:
-    - name: include debian_prerequisites.yml
   include_tasks: debian_prerequisites.yml
-      tags:
-        with_pkg
-    - name: install python-six
-      package:
-        name: python-six
-        state: present
-        update_cache: yes
-      register: result
-      until: result is succeeded
-      tags:
-        with_pkg
-
-- name: ubuntu based systems tasks
   when:
-    - ansible_distribution == 'Ubuntu'
+    - ansible_os_family == 'Debian'
+    - container_package_name == 'docker-ce'
   tags:
     with_pkg
-  block:
-    - name: install docker on ubuntu
-      package:
-        name: ['docker.io', 'python-docker']
-        state: present
-        update_cache: yes
-      register: result
-      until: result is succeeded
-    - name: install python3-docker on bionic
-      package:
-        name: python3-docker
-        state: present
-        update_cache: yes
-      register: result
-      until: result is succeeded
-      when: ansible_lsb.codename == 'bionic'
 
 # ensure extras enabled for docker
 - name: enable extras on centos
@@ -54,46 +28,16 @@
   tags:
     with_pkg
 
-- name: red hat based systems tasks
-  when:
-    - ansible_os_family == 'RedHat'
-  block:
-    - name: red hat 7 based systems tasks
-      when:
-        - ansible_distribution_major_version == '7'
-      block:
-        - name: install python-docker-py on red hat / centos
+- name: install container package
   package:
-            name: ['docker', 'python-docker-py']
-            state: present
-          register: result
-          until: result is succeeded
+    name: ['{{ container_package_name }}', '{{ container_binding_name }}']
+    update_cache: true
   tags:
     with_pkg
 
-        - name: pause after docker install before starting (on openstack vms)
-          pause: seconds=5
-          when:
-            - ceph_docker_on_openstack
-          tags:
-            with_pkg
-
-    - name: red hat 8 based systems tasks
-      when:
-        - ansible_distribution_major_version == '8'
-      block:
-        - name: install podman
-          package:
-            name: 'podman'
-            state: present
-          register: result
-          until: result is succeeded
-          tags:
-            with_pkg
-
-- name: start docker service
+- name: start container service
   service:
-    name: docker
+    name: '{{ container_service_name }}'
     state: started
     enabled: yes
   tags:

roles/ceph-container-common/vars/Debian.yml

@@ -0,0 +1,4 @@
+---
+container_package_name: docker-ce
+container_service_name: docker
+container_binding_name: python-docker

roles/ceph-container-common/vars/RedHat-8.yml

@@ -0,0 +1,3 @@
+---
+container_package_name: podman
+container_binding_name: podman

roles/ceph-container-common/vars/RedHat.yml

@@ -0,0 +1,4 @@
+---
+container_package_name: docker
+container_service_name: docker
+container_binding_name: python-docker-py

roles/ceph-container-common/vars/Ubuntu-16.yml

@@ -0,0 +1,4 @@
+---
+container_package_name: docker.io
+container_service_name: docker
+container_binding_name: python-docker

roles/ceph-container-common/vars/Ubuntu-18.yml

@@ -0,0 +1,4 @@
+---
+container_package_name: docker.io
+container_service_name: docker
+container_binding_name: python3-docker