Add binaries to PATH with Ansible - bash

Question

I'm trying to install the Kiex Version manager for the Elixir programming language using Ansible.
These are the plays I use for this:
- name: Kiex Installation
hosts: web
gather_facts: false
remote_user: deployer
tasks:
- shell: \curl -sSL https://raw.githubusercontent.com/taylor/kiex/master/install | bash -s
- name: Add Kiex Bin to Path
lineinfile:
dest: /home/deployer/.bashrc
regexp: '^test -s'
line: '[[ -s "$HOME/.kiex/scripts/kiex" ]] && source "$HOME/.kiex/scripts/kiex"'
- name: Reload Path
shell: source /home/deployer/.bashrc
args:
executable: /bin/bash
- shell: echo $PATH
register: pathul
- debug:
var: pathul
- name: Elixir Installation
hosts: web
gather_facts: false
remote_user: deployer
tasks:
- shell: echo $PATH
register: pathul
- debug:
var: pathul
- name: Install Elixir Version
command: /home/deployer/.kiex/bin/kiex list
args:
executable: /bin/bash
chdir: /home/deployer/
- name: Set Elixir Version as Default
shell: kiex default 1.4
The Installation of Kiex is a success and if I log in to the remote Machine I am able to run it simply by using the kiex command. I can do this because I sourced the binaries in "~/.kiex/scripts/kiex". When I echo the $PATH variable it shows the kiex binaries path /home/deployer/.kiex/bin in it:
$ echo $PATH
/home/deployer/.kiex/bin:/home/deployer/.kiex/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
However the kiex, kiex list and even the /home/deoployer/.kiex/bin/kiex list in the Elixir Installation Play shown above fail with the message:
TASK [Set Elixir Version as Default] *******************************************
fatal: [local-web-2]: FAILED! => {"changed": true, "cmd": "kiex default 1.4", "delta": "0:00:00.002042", "end": "2017-01-26 22:13:32.898082", "failed": true, "rc": 127, "start": "2017-01-26 22:13:32.896040", "stderr": "/bin/sh: 1: kiex: not found", "stdout": "", "stdout_lines": [], "warnings": []}
Also the pathul variable that registered the result of echoing the path via ansible doesn't contain /home/deployer/.kiex/bin:
"stdout": "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games"
How can I make the kiex command work properly via Ansible?

Answer 1

Just use the full, absolute path, like you tried in the Install Elixir Version task, but mind that you have a typo, both, in the example and in the explanation you posted:
command: /home/deoployer/.kiex/bin/kiex list
[ ] even the /home/deoployer/.kiex/bin/kiex list [ ] fail[s]
It should likely be deployer, like in the first play, not deoployer.
There is no reason otherwise for Ansible to fail with "kiex: not found" message, if you provide the correct path.
Explanations regarding other tasks:
Quoting man bash:
When an interactive shell that is not a login shell is started, bash reads and executes commands from ~/.bashrc, if that file exists.
So your ~/.bashrc is not even read when you execute tasks with Ansible, because it's not an interactive session.
This is for example why your pathul variable does not contain changes applied in the ~/.bashrc.
The following two tasks run separate bash processes. The environment sourced in the first task has no influence on the environment of the second:
- name: Reload Path
shell: source /home/deployer/.bashrc
args:
executable: /bin/bash
- shell: echo $PATH
register: pathul