Ignore lines starting with '//' and empty lines in yaml code-CodePudding

I'm trying to read all lines in a .txt file except the lines starting with two forward slashes '//' and empty lines using lookup in my yaml code, this is what my code looks like:

---
- name: playbook for API release deployment
  hosts: api
  become: yes
  ignore_errors: true
  vars:
    date: "{{ lookup('pipe', 'date  %Y.%m.%d-%H.%M') }}"

  tasks:
    - name: deploy-api | upgrade Addons using loop
      command: "{{ module_install }} -u {{ item }} --stop-after-init"
      args:
        chdir: /opt/app/
      with_items:
        - "{{ lookup('file', 'addons.txt') | grep -v '^(//)' }}"

This is what the .txt file looks like:

// Comment 1
// Commment 2
// Comment 3

// Comment 4

addons 1
addons 2
addons 3

Ansible throws me an error:

fatal: FAILED! => {"msg": "template error while templating string: expected token 'end of print statement', got 'string'. String: {{ lookup('file', 'addons.txt') | grep -v '^(//)' }}"}

I'm not sure on how to do this, how should I escape those lines starting with '//' and empty lines?

CodePudding user response：

Consider rethinking your code. Instead of addons.txt just use a proper Ansible array variable.

// inventory/all/all.yml
# comment
addons:
  - addons 1
  - addons 2
  - addons 3

// playbook.yml
      with_items: '{{ addons }}'

Anyway, untested, something like the following can make you started:

with_items: "{{
   lookup('file', 'addons.txt').splitlines() |
   reject('match', '^//') |
   join('\n')
   }}"

CodePudding user response：

Q: "How should I escape lines starting with '//' and empty lines?"

A: reject matching lines. See Testing strings. For example,

  lines: "{{ lookup('file', 'addons.txt').splitlines()|
             reject('regex', '^//')|
             reject('regex', '^$') }}"

gives

  lines:
  - addons 1
  - addons 2
  - addons 3

^{Example of a complete playbook for testing
- hosts: localhost

vars:

module_install: install
lines: "{{ lookup('file', 'addons.txt').splitlines()|
reject('regex', '^//')|
reject('regex', '^$') }}"

tasks:

- debug:
var: lines

- debug:
msg: "{{ module_install }} -u {{ item }} --stop-after-init"
loop: "{{ lines }}"

gives
PLAY [localhost] *****************************************************************************

TASK [debug] *********************************************************************************
ok: [localhost] =>
lines:
- addons 1
- addons 2
- addons 3

TASK [debug] *********************************************************************************
ok: [localhost] => (item=addons 1) =>
msg: install -u addons 1 --stop-after-init
ok: [localhost] => (item=addons 2) =>
msg: install -u addons 2 --stop-after-init
ok: [localhost] => (item=addons 3) =>
msg: install -u addons 3 --stop-after-init

PLAY RECAP ***********************************************************************************
localhost: ok=2 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0}