Allow the role to only configure pip, not install it

There are times when you may wish to just configure pip,
not install it. This adds a flag to enable that option.

Change-Id: Ibaa3c0b6b323f22dbd640562362106166bbc0a0a

defaults/main.yml

@@ -57,6 +57,12 @@ cache_timeout: 600
 # is intercepting the certificates.
 pip_validate_certs: "yes"
 
+# Boolean variable to set whether the role should
+# install pip if it is found to be missing. There
+# are times when you may just want to only configure
+# pip, instead of also installing it.
+pip_install: true
+
 # Boolean variable to set whether pip.conf should be
 # implemented to adjust pip's default behaviour.
 # By default we do this, but sometimes we want to

tasks/install.yml

@@ -21,3 +21,20 @@
   until: install_packages is success
   retries: 5
   delay: 2
+
+- name: Determine PIP installation script
+  shell: >
+    if [[ $(set -o pipefail; pip --version 2>/dev/null | awk '{print $2}' | cut -d. -f1) -ge 7 ]]; then
+        echo "$(which pip) install --upgrade"
+    else
+        echo "python /opt/get-pip.py"
+    fi
+  args:
+    executable: /bin/bash
+  register: pip_install_script
+  changed_when: False
+
+- include_tasks: "install_{{ pip_offline_install | ternary('offline', 'online') }}.yml"
+  when: pip_install_script.find('get-pip.py') != -1 # skip get-pip.py if a suitable pip is installed
+
+- include_tasks: install_source.yml

tasks/main.yml

@@ -30,27 +30,8 @@
   tags:
     - pip_install-config
 
-- include_tasks: pre_install.yml
+- include_tasks: install.yml
-  tags:
+  when:
-    - pip_install-install
+    - pip_install | bool
-
-- name: Determine PIP installation script
-  shell: >
-    if [[ $(set -o pipefail; pip --version 2>/dev/null | awk '{print $2}' | cut -d. -f1) -ge 7 ]]; then
-        echo "$(which pip) install --upgrade"
-    else
-        echo "python /opt/get-pip.py"
-    fi
-  args:
-    executable: /bin/bash
-  register: pip_install_script
-  changed_when: False
-
-- include_tasks: "install_{{ pip_offline_install | ternary('offline', 'online') }}.yml"
-  tags:
-    - pip_install-install
-  when: pip_install_script.stdout.find('get-pip.py') != -1 # skip get-pip.py if a suitable pip is installed
-
-- include_tasks: install_source.yml
   tags:
     - pip_install-install