Ensure pip/setuptools/wheel are up to date in the wheel build venv

To ensure consistency, we make sure that the venv used for the wheel
build has an up to date and the right versions of pip/setuptools/wheel.

Change-Id: Iac3e5054b5ef482bba2954e40c2c4d32a7f863df

tasks/repo_build_prepare.yml

@@ -73,6 +73,11 @@
       (_wheel_build_constraints | changed) or
       (repo_build_wheel_rebuild | bool)
 
+- name: Create the virtualenv (if it does not exist)
+  command: "virtualenv --never-download --no-site-packages {{ repo_build_bin | dirname }}"
+  args:
+    creates: "{{ repo_build_bin }}/activate"
+
 # Note(odyssey4me):
 # To cater for a situation where the pip packages are changing, but the repo
 # does not yet have the package built, we need to ensure that this task can
@@ -82,6 +87,23 @@
   tags:
     - repo-build-install
   block:
+    - name: Upgrade pip/setuptools/wheel to the versions we want (from repo)
+      pip:
+        name:
+          - pip
+          - setuptools
+          - wheel
+        state: "{{ repo_build_pip_package_state }}"
+        virtualenv: "{{ repo_build_bin | dirname }}"
+        virtualenv_site_packages: "no"
+        extra_args: >-
+          --constraint {{ repo_build_release_path }}/requirements_constraints.txt
+          {{ pip_install_options | default('') }}
+      register: install_packages
+      until: install_packages is success
+      retries: 5
+      delay: 2
+
     - name: Install pip packages (from repo)
       pip:
         name: "{{ repo_pip_packages }}"
@@ -90,12 +112,31 @@
         virtualenv_site_packages: "no"
         extra_args: >-
           --constraint {{ repo_build_release_path }}/requirements_constraints.txt
-          {{ pip_install_options }}
+          {{ pip_install_options | default('') }}
       register: install_packages
       until: install_packages is success
       retries: 5
       delay: 5
   rescue:
+    - name: Upgrade pip/setuptools/wheel to the versions we want (from pypi mirror)
+      pip:
+        name:
+          - pip
+          - setuptools
+          - wheel
+        state: "{{ repo_build_pip_package_state }}"
+        virtualenv: "{{ repo_build_bin | dirname }}"
+        virtualenv_site_packages: "no"
+        extra_args: >-
+          --index-url {{ repo_build_pip_default_index }}
+          --trusted-host {{ repo_build_pip_default_index | netloc_no_port }}
+          --constraint {{ repo_build_release_path }}/requirements_constraints.txt
+          {{ pip_install_options | default('') }}
+      register: install_packages
+      until: install_packages is success
+      retries: 5
+      delay: 2
+
     - name: Install pip packages (from pypi mirror)
       pip:
         name: "{{ repo_pip_packages }}"
@@ -106,7 +147,7 @@
           --index-url {{ repo_build_pip_default_index }}
           --trusted-host {{ repo_build_pip_default_index | netloc_no_port }}
           --constraint {{ repo_build_release_path }}/requirements_constraints.txt
-          {{ pip_install_options }}
+          {{ pip_install_options | default('') }}
       register: install_packages
       until: install_packages is success
       retries: 5