Sunday, July 10, 2022

[SOLVED] curl command with pipe not working in Ansible

Issue

I am trying to execute below command which is part of Docker installation, but it got stuck.

The gpg part of the command got stuck, if I remove gpg after pipe, it works.

---
- hosts: all
  become: yes

  tasks:

    - name: add docker GPG key
      shell: "curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.gpg"

Solution

General Ansible advise: if you just feed all your command lines in shell tasks in Ansible, then you are doing it wrong.
Ansible does have existing module, that are purposed to serve the idempotency idea that is at the root of Ansible goal and that will greatly simplify all tasks you will try to achieve.

This being said, you now have to understand what that specific line of the Docker manual is trying to achieve.

curl -fsSL https://download.docker.com/linux/ubuntu/gpg \ 
| gpg --dearmor -o /etc/apt/keyrings/docker.gpg

It's actually a line that would add the GPG key of Docker to a trusted keyring on the node, so it can validate the authenticity of the package you will later use in a package task.

So the purposed module, in this case is the apt_key one.

Your task ends up being:

- name: add docker GPG key
  apt_key:
    url: https://download.docker.com/linux/ubuntu/gpg


Answered By - β.εηοιτ.βε
Answer Checked By - Cary Denson (WPSolving Admin)
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