Fix initial python/venv dependencies

If you're running 'ansible-playbook -i inventory/target install.yaml'
install python3-pip on the system as early as possible.

We need to set ansible_python_interpreter to the system, because some
roles set it to {{ bifrost_venv_dir }}/bin/python3, which doesn't
necessarily exist at this moment.

We can now create a venv, and override ansible_python_interpreter

Change-Id: Iee5125c61151f01538371f4140cd5321ab509bba

playbooks/install.yaml

@@ -3,6 +3,33 @@
   name: "Install Ironic on the target host."
   become: yes
   gather_facts: yes
+  vars:
+    bifrost_venv_dir: "{{ lookup('env', 'VENV') or '/opt/stack/bifrost' }}"
+    ansible_python_interpreter: "/usr/bin/env python3"
+  pre_tasks:
+    - name: install pip (and venv) to system
+      package:
+        name: "{{ packages | select | list }}"
+      vars:
+        packages:
+          - python3-pip
+          - "{{ (ansible_facts['os_family'] == 'Debian') | ternary('python3-venv', '') }}"
+
+    - name: create venv
+      command: python3 -m venv {{ bifrost_venv_dir }}
+      args:
+        creates: "{{ bifrost_venv_dir }}/bin/python3"
+
+    # NOTE(ebbex): (incase it's missing, which it shouldn't normally be)
+    - name: install setuptools in venv
+      command: "{{ bifrost_venv_dir }}/bin/pip3 install setuptools"
+      args:
+        creates: "{{ bifrost_venv_dir }}/lib/python*/site-packages/setuptools"
+
+    - name: override ansible_python_interpreter to venv
+      set_fact:
+        ansible_python_interpreter: "{{ bifrost_venv_dir + '/bin/python3' }}"
+
   roles:
     - role: bifrost-prep-for-install
       when: not (skip_install | default(false) | bool)

playbooks/roles/bifrost-ironic-install/defaults/required_defaults_Debian_family.yml

@@ -15,7 +15,6 @@ required_packages:
   - python3-dev
   - python3-mysqldb
   - python3-pymysql
-  - python3-setuptools
   - libffi-dev
   - libxslt1-dev
   - libssl-dev
@@ -33,7 +32,6 @@ required_packages:
   - uuid-runtime
   - curl
   - socat
-  - python3-pip
   - gcc
   - dnsmasq
   - apache2-utils

playbooks/roles/bifrost-ironic-install/defaults/required_defaults_RedHat_family.yml

@@ -33,7 +33,6 @@ required_packages:
   - python3-libselinux
   - python3-policycoreutils
   - gcc
-  - python3-pip
   - socat
   - firewalld
   - python3-firewall