yaml - yq:如何读取兄弟元素的值？

Question

我正在探索 yq 以修改我的 YAML，我想在 name == openshift45 的 ImageStream 的 spec 下添加一个新元素

apiVersion: v1
items:
- apiVersion: image.openshift.io/v1
  kind: ImageStream
  metadata:
    annotations:
      openshift.io/generated-by: OpenShiftNewApp
    creationTimestamp: null
    labels:
      app: openshift45
      app.kubernetes.io/component: openshift45
      app.kubernetes.io/instance: openshift45
    name: nodejs-10
  spec:
    lookupPolicy:
      local: false
    tags:
    - annotations:
        openshift.io/imported-from: registry.access.redhat.com/ubi8/nodejs-10
      from:
        kind: DockerImage
        name: registry.access.redhat.com/ubi8/nodejs-10
      generation: null
      importPolicy: {}
      name: latest
      referencePolicy:
        type: ""
  status:
    dockerImageRepository: ""
- apiVersion: image.openshift.io/v1
  kind: ImageStream
  metadata:
    annotations:
      openshift.io/generated-by: OpenShiftNewApp
    creationTimestamp: null
    labels:
      app: openshift45
      app.kubernetes.io/component: openshift45
      app.kubernetes.io/instance: openshift45
    name: openshift45
  spec:
    lookupPolicy:
      local: false
  status:
    dockerImageRepository: ""

下面的命令返回有效的 metadata 元素。现在，我想移动到父级，然后选择 spec。 yq 是否可行 - https://github.com/mikefarah/yq ？

yq r openshift45.yaml --printMode pv "items(kind==ImageStream).(name==openshift45)"

返回

items.[1].metadata:
  annotations:
    openshift.io/generated-by: OpenShiftNewApp
  creationTimestamp: null
  labels:
    app: openshift45
    app.kubernetes.io/component: openshift45
    app.kubernetes.io/instance: openshift45
  name: openshift45

预期输出:

apiVersion: v1
items:
- apiVersion: image.openshift.io/v1
  kind: ImageStream
  metadata:
    annotations:
      openshift.io/generated-by: OpenShiftNewApp
    creationTimestamp: null
    labels:
      app: openshift45
      app.kubernetes.io/component: openshift45
      app.kubernetes.io/instance: openshift45
    name: nodejs-10
  spec:
    lookupPolicy:
      local: false
    tags:
    - annotations:
        openshift.io/imported-from: registry.access.redhat.com/ubi8/nodejs-10
      from:
        kind: DockerImage
        name: registry.access.redhat.com/ubi8/nodejs-10
      generation: null
      importPolicy: {}
      name: latest
      referencePolicy:
        type: ""
  status:
    dockerImageRepository: ""
- apiVersion: image.openshift.io/v1
  kind: ImageStream
  metadata:
    annotations:
      openshift.io/generated-by: OpenShiftNewApp
    creationTimestamp: null
    labels:
      app: openshift45
      app.kubernetes.io/component: openshift45
      app.kubernetes.io/instance: openshift45
    name: openshift45
  spec:
    *dockerImageRepository: <$MYREGISTRY>/<$MYNAMESPACE>/<$MYPROJECT>*
    lookupPolicy:
      local: false
  status:
    dockerImageRepository: ""

Answer 1

Path Expressions in mikefarah/yq没有完整的文档来展示如何使用多个条件来获得所需对象的真实示例。因此，对于有问题的 YAML，使用一个独特的条件，您可以执行如下操作。在 yq 版本 3.3.2

中验证

yq w openshift45.yaml 'items.(metadata.name == openshift45).spec.dockerImageRepository' '<$MYREGISTRY>/<$MYNAMESPACE>/<$MYPROJECT>'

您可以使用 -i 标志和 write 来就地修改 YAML。参见 Updating files in-place

如果这不是您想要的，并且您需要多个条件选择才能获得所需的对象，建议在 GitHub 页面上提出问题 - https://github.com/mikefarah/yq/issues请求正确的语法。