Creating name of inventory group from a variable

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1

I have a task where I am updating a line in a file with a comma separated list of inventory hosts, this works for the hard coded case:

  • name: Set host list
    lineinfile: dest=/home/project/pom.xml regexp=‘.*’ line='{{ groups.tag_Type_targettype | intersect(‘groups.key_mykey) | join(’, ‘) }}’

key_mykey is a group generated from ec2 properties in a dynamic inventory using:

  • name: Create groups based on ec2 access key
    group_by: key=key_{{ ec2_key_name }}

The issue I’m facing is that I need to be able to generate the intersection ‘key_’ from a variable so that I can generate different intersections at playbook runtime.

I have tried different ways to use a variable for , most give a runtime error, the following does not, but it also generates an empty hosts list.

vars:
ec2keyname: mykey

intersect(‘groups.key_’ + ec2keyname)

Is there a way to use a variable in the intersection groups name?

Andy

2

The solution turned out to be simply to use variable bracket notation instead of dot notation, the value in the brackets can be formed from the concatenation of a string and a variable

line=‘{{ groups.tag_Type_syncgateway | intersect(groups[key_’ + ec2keyname]) | join(‘,’) }}’