okd/roles/openshift_logging/tasks/patch_configmap_file.yaml

---
## The purpose of this task file is to get a patch that is based on the diff
##  between configmap_current_file and configmap_new_file. The module
##  logging_patch takes the paths of two files to compare and also a list of
##  variables whose line we exclude from the diffs.
##  We then patch the new configmap file so that we can build a configmap
##  using that file later. We then use oc apply to idempotenly modify any
##  existing configmap.

## The following variables are expected to be provided when including this task:
# __configmap_output         -- This is provided to us from patch_configmap_files.yaml
#                                it is a dict of the configmap where configmap_current_file exists
# configmap_current_file     -- The name of the data file in the __configmap_output
# configmap_new_file         -- The path to the file that we intend to oc apply later
#                                we apply our generated patch to this file.
# configmap_protected_lines  -- The list of variables to exclude from the diff

- when:
  - configmap_current_file in __configmap_output.results.results[0]['data']
  block:
  - copy:
      content: "{{ __configmap_output.results.results[0]['data'][configmap_current_file] }}"
      dest: "{{ tempdir }}/current.yml"

  - logging_patch:
      original_file: "{{ tempdir }}/current.yml"
      new_file: "{{ configmap_new_file }}"
      whitelist: "{{ configmap_protected_lines | default([]) }}"
    register: patch_output

- when:
  - patch_output.raw_patch is defined
  - patch_output.raw_patch | length > 0
  block:
  - slurp:
      src: "{{ configmap_new_file }}"
    register: new_file_slurp

  - local_action: copy content="{{ patch_output.raw_patch }}\n" dest={{ local_tmp.stdout }}/patch.patch
    become: false

  - local_action: copy content={{ new_file_slurp['content'] | b64decode }} dest={{ local_tmp.stdout }}/configmap_new_file
    become: false

  - local_action: command patch --force --quiet -u {{ local_tmp.stdout }}/configmap_new_file {{ local_tmp.stdout }}/patch.patch
    become: false

  - copy:
      src: "{{ local_tmp.stdout }}/configmap_new_file"
      dest: "{{ configmap_new_file }}"