Use variables set in preup state inside topology file

[patchkez]

Hello,
we would like to set variables in preup state and use them in topology file.

In this example bellow, we try to retrieve openstack network id dynamically and then use the id in topology file without hardcoding it.
We tried something like this.
PinFile:

cinch:
    topology: jslave_topology.yml
    hooks:
      preup:
        - type: ansible
          name: Get Openstack network ID with most usable IPs
          actions:
            - playbook: get_network_id.yml

jslave_topology file:

---
topology_name: jslave-test
resource_groups:
  - resource_group_name: jslave-group
    resource_group_type: openstack
    resource_definitions:
      - name: {{SERVER_NAME}}
        role: "os_server"
        flavor: "ci.m1.small"
        image: {{IMAGE_NAME}}
        count: 1
        keypair: mykeypair
        networks:
          - {{ DYNAMIC_NETWORK_ID }}
    credentials:
      filename: clouds.yaml
      profile: ci-rhos

get_network_id.yml

---
- name: Get Network ID dynamically
  shell: |
      openstack network list -c ID -c Name -f value |
      egrep 'cci_(10|[4-9])' |
      awk '{print $1}' |
      xargs -n1 openstack ip availability show -f shell |
      awk -F ',' '/ip_version='\''4'\''|^id=/{ if ($0 ~ /^id=/) {split($0,uuid,"="); gsub(/"/,"",uuid[2]);
      printf uuid[2]" "} else { split($5,total,"="); split($6,used,"="); gsub(/'\''/,"",total[2]); gsub(/'\''/,"",used[2]); free=total[2]-used[2]; print free} }' |
      sort -nrk2 |
      cut -f1 -d ' ' |
      head -n1
  environment:
    OS_CLOUD: ci-rhos
  register: dynamic_net
 
- name: set dynamic network id as fact
  set_fact:
    DYNAMIC_NETWORK_ID: "{{ dynamic_net.stdout }}"

We use older linchpin and ansible versions:

venv_linch:
  - linchpin==1.6.1
  - ansible==2.7.6

venv_cinch:
  - cinch==1.2.0