shell module: Bash <(process substitution) with ansible - shell

Question

I want to run a command:
- name: install pip
shell: "python <(curl https://bootstrap.pypa.io/get-pip.py)"
But achieve an error
failed: [default] => {"changed": true, "cmd": "python <(curl https://bootstrap.pypa.io/get-pip.py)", "delta": "0:00:00.002073", "end": "2014-12-03 15:52:01.780837", "rc": 2, "start": "2014-12-03 15:52:01.778764", "warnings": []}
stderr: /bin/sh: 1: Syntax error: "(" unexpected
I tried to change it to something like:
python <$(curl https://bootstrap.pypa.io/get-pip.py)
but it doesn't work. Any thoughts?
NB: this question about using < operator in shell module and I know that better to use apt for install something

Answer 1

Use command module if you actually do not need shell.
Also you will be better off using get_url module for downloading the file instead of relying on curl being installed on remote server.
Recent versions of Ansible will display a warning when you try to use curl instead of get_url module also:
"warnings": ["Consider using get_url module rather than running curl"]
Here is how I would do this:
- name: Download pip installer
get_url:
url=https://bootstrap.pypa.io/get-pip.py
dest=/tmp/get-pip.py
mode=0440
- name: Install pip
command: /usr/bin/python /tmp/get-pip.py
For extra options to get_url module visit: http://docs.ansible.com/get_url_module.html

Answer 2

EDIT: though this answers this the question I think mgsk's answer is a better answer since I agree that it's not the right way to go about it with Ansible.
This should fix your issue:
- name: install pip
shell: "python <(curl https://bootstrap.pypa.io/get-pip.py)" executable=/bin/bash
If you are wondering the difference between these two commands:
python <(curl https://bootstrap.pypa.io/get-pip.py)
python <$(curl https://bootstrap.pypa.io/get-pip.py)
The first one uses process substitution which is a bash feature which is why you cannot use it with /bin/sh as your shell. What it's doing is taking the output of the curl command (which is a python script), writing it to a temporary file and using that file as an argument to python which takes a python script as its first argument.
The second one is an ambiguous redirect because the python script that is generated from the curl is not a file

Answer 3

- name: configure zookeeper /etc/zookeeper/conf/zoo.cfg
shell: "{{ item }}"
with_items:
if [ -f /etc/zookeeper/conf/zoo_cfg.org ] ;
then cp /etc/zookeeper/conf/zoo_cfg.org /etc/zookeeper/conf/zoo.cfg ;
else cp /etc/zookeeper/conf/zoo.cfg /etc/zookeeper/conf/zoo_cfg.org;
fi;
cat /vagrant/zoo.cfg.j2 >> /etc/zookeeper/conf/zoo.cfg;