Updating logging_facts to be able to pull values from config maps yaml files, use diffs to keep custom changes, white list certain settings when creating diffs

1 files changed, 35 insertions, 0 deletions

diff --git a/roles/openshift_logging/tasks/patch_configmap_file.yaml b/roles/openshift_logging/tasks/patch_configmap_file.yaml
new file mode 100644
index 000000000..30087fe6a
--- /dev/null
+++ b/roles/openshift_logging/tasks/patch_configmap_file.yaml
@@ -0,0 +1,35 @@
+---
+## 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
+
+- 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
+
+- copy:
+    content: "{{ patch_output.raw_patch }}\n"
+    dest: "{{ tempdir }}/patch.patch"
+  when: patch_output.raw_patch | length > 0
+
+- command: >
+    patch --force --quiet -u "{{ configmap_new_file }}" "{{ tempdir }}/patch.patch"
+  when: patch_output.raw_patch | length > 0