Create a variable that contains other variable values with labels

[Mark Tovey]

    I have a list:

list1

    - value1

    - value2

 

    and I want to use set_fact create a new variable that contains these variables with a label in front of them, so that this debug task:

- debug:

msg:  "{{var1}}"

     would result in output that looks like this:

label value1

label value2 

    This gives me the expected results:

- set_fact:

var1:  |+

"{{'label ' ~ list1[0]}}"

"{{'label ' ~ list1[1]}}" 

    But I need more flexibility than that.  I need to be able to add or remove values to or from the list and not have to modify the set_fact task each time to accommodate the modification.  I tried using the join filter:

- set_fact:

var1:

"{{'label ' ~ list1 | join('\n')}}"

     And that got me:

label value1

value2

    Close, but not quite.  So what is the best method of achieving what I want? 

 

 

[Matthew Davis]

Here is a solution using regex and map. It's not the most computationally efficient, but it works.

---
- hosts: localhost
  tasks:
    - name: set first fact
      set_fact:
        list1:
          - value1
          - value2

    - name: set second fact
      set_fact:
        var1: "{{ list1 | map('regex_replace', '^(.*)$','label \\1')  | list }} "

    - name: print second fact
      debug:
        var: var1

Regards,

Matt

[Mark Tovey - DSV]

 

    Whatever works is what counts.

    Thanks,

    -Mark

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