Coder asked:
I am very new to Ansible and having an issue.
I want to run the module only if a condition is met but if the condition is failed, it should fail the task and report to user.
Currently what I have done, it will only skip it rather than failing it.
Below is my code, I have the when condition to check and only run if result.stdout == ‘valid’ but I want to fail the task if its ‘invalid’.Currently it just skips it if condition not met.
---
- name: Check Value
become: yes
shell: /usr/bin/python3 check.py
args:
chdir: "mydir/scripts/"
register: result
tags: data_merge
- name: Merge Data
become: yes
when: result.stdout == 'valid'
local_action:
module: some_module
provider: "{{some_provider}}"
role_path: "{{role_path}}"
run_once: true
tags: data_merge
My answer:
You should fail yourself explicitly in this scenario.
- name: Fail when value is not valid
fail:
msg: "A custom message to tell the user what went wrong"
when: result.stdout != 'valid'
You can also simply check the result directly in the play which runs your check script.
- name: Check Value
become: yes
shell: /usr/bin/python3 check.py
args:
chdir: "mydir/scripts/"
register: result
tags: data_merge
failed_when: "'invalid' in result.stdout"
You should consider using exit codes in your application to indicate success or failure, as most programs already do. This makes for a much more reliable check than checking for text on stdout. Use sys.exit() in Python to do this. In that case, checking for failure is simply when result.rc != 0.
(And of course you should use command instead of shell whenever possible.)
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