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Motivation¶

Our extensive use of YAML merge keys << is hitting limits. Only the top level is merged. In the context of scenarios it can be more desirable to include settings, which are at the second level.

Acceptance criteria¶

• AC1: A "deep merge" of multi-level YAML sections are possible within one YAML document with a special tag

Suggestions¶

tinita wrote:

Just a note: YAML Merge Keys << are not performing a "deep merge". It only merges at the top level.
So in the following example the settings would only contain the ANOTHER_SETTING.

- .testsuite: &crypt_no_lvm
    description: |
      bla bla bla
    settings:
      YAML_SCHEDULE: schedule/yast/encryption/crypt_no_lvm.yaml
      YAML_TEST_DATA: test_data/yast/encryption/encrypt_no_lvm.yaml
- crypt_no_lvm:
    settings:
      ANOTHER_SETTING: foo
    <<: *crypt_no_lvm

Resulting data with resolved merge keys:

- .testsuite:
    description: |
      bla bla bla
    settings:
      YAML_SCHEDULE: schedule/yast/encryption/crypt_no_lvm.yaml
      YAML_TEST_DATA: test_data/yast/encryption/encrypt_no_lvm.yaml
- crypt_no_lvm:
    description: |
      bla bla bla
    settings:
      ANOTHER_SETTING: foo

A custom tag which I will call !inherit could fix that. And although I'm hesistant to diverge from standard YAML, I think we could try and keep it generic and straightforward to implement in e.g. YAML schedules or Python code.

Proposal in #66865#note-1