Merge pull request #4 from yetu/master

Upgrade pip to "latest" version

.gitignore

@@ -0,0 +1 @@
+.idea

README.md

@@ -8,6 +8,9 @@ Role Variables
 --------------
 
 - `pip_download_dest` specifies where `get-pip.py` should be downloaded to. Defaults to `/tmp`
-- `pip_version` specifies which version of pip you want to install. Defaults to `None`, to install the latest version.
+- `pip_version` specifies which version of pip you want to install. 
+  - Defaults to `None`, to install the latest version (If pip is installed, upgrades to the latest pip version available)
+  - Can be set to a specific verion, e.g. `"6.0.8"` to force installation of that version.
+  - Can be set explicitly to `"LATEST"` to force upgrade to the latest available version (same behaviour as `None`).
 - `python` specifies what Python executable to use.  Defaults to `python`.
 - `pip` specifies what pip executable to check and use.  Defaults to `pip`.

tasks/main.yml

@@ -7,6 +7,7 @@
   ignore_errors: true
   changed_when: false
   register: pip_is_installed
+  changed_when: false
 
 - name: download pip
   get_url: url=https://bootstrap.pypa.io/get-pip.py dest={{ pip_download_dest }}
@@ -27,9 +28,16 @@
   shell: "{{ pip }} --version | awk '{print $2}'"
   register: pip_installed_version
   changed_when: false
-  when: pip_version != None
+  when: pip_version != None or pip_version != "LATEST"
 
 - name: install required version of pip
   command: "{{ pip }} install pip=={{ pip_version }}"
   sudo: yes
-  when: pip_version != None and pip_installed_version.stdout != pip_version
+  when: pip_version != None and pip_installed_version.stdout != pip_version and pip_version != "LATEST"
+
+- name: Upgrade to latest version of pip
+  command: "{{ pip }} install -U pip"
+  register: pip_latest_output
+  sudo: yes
+  changed_when: pip_latest_output.stdout.find('Requirement already up-to-date') == -1
+  when: pip_version == None or pip_version == "LATEST"