how to select list to update

[pycgo]

yaml

spec:
  groups:
  - name: test
    rules:
    - alert: test1
      labels:
        a: b
        linkflowAlert: warning
    - alert: test2
      labels:
        severity: warning
       ......

i want to change rules(list) --> alert: test2 --> labels add a new lables like this

spec:
  groups:
  - name: test
    rules:
    - alert: test1
      labels:
        a: b
        linkflowAlert: warning
    - alert: test2
      labels:
        severity: warning
        linkflowAlert: warning
     ......

do not use
yq e '.spec.groups[0].rules[1].labels += {"linkflowAlert": "warning"}'
how can i select "alert: test2", then to update labels

[mikefarah]

You can do it this way:

yq ' (.. | select(tag == "!!map" and .alert == "test2") | .labels) += {"a":"c"}' file.yaml

Explanation:

• .. matches all nodes in the yaml document
• select(tag == "!!map" and .alert == "test2") will filter to only include map nodes that have alert: test2

[pycgo]

Thank you very much. You're a great man