Apply CUE templates to all list items, not just the first

[cueckoo]

Originally opened by @jdstone-ig in cuelang/cue#416

I have the following template. If the definition contains more than one container (shown below), the second and subsequent containers (if any) don't contain the tz-config volumeMount. Only the first container, mysql contains the tz-config volumeMount. The second container, sanitizer just shows {} in its place. The actual evaluation and the expected evaluation are below.

NOTE: I've pulled out a bunch of irrelevant information for easier readability.

template.cue

deployment: [ID=_]: _spec & {
  kind:       "Deployment"
  apiVersion: "apps/v1"
}

_spec: {
  spec: template: spec: {
      containers: [{
        volumeMounts: [
          close({
            name:      "tz-config"
            mountPath: "/etc/localtime"
            readOnly:  true
          }), ...,
        ]
      }]
    }
  }
}

deployment.cue

deployment: "test-name": {
  let Image = "test-image"

  spec: template: spec: {
    containers: [
      {
        name:            "mysql"
        image:           Image
        imagePullPolicy: "Always"
        command: ["/usr/local/bin/start_mysql.sh"]
        volumeMounts: [
          {},
          {
            name:      "test-name-mysql"
            mountPath: "/var/lib/mysql"
          },
        ]
      },
      {
        name:            "sanitizer"
        image:           Image
        imagePullPolicy: "Always"
        command: ["/usr/local/bin/sanitize.sh"]
        volumeMounts: [
          {},
          {
            name:      "test-name-mysql"
            mountPath: "/var/lib/mysql"
          },
        ]
      },
    ]
  }
}

actual evaluation

deployment: {
  "test-name": {
    kind:       "Deployment"
    spec: {
      template: {
        spec: {
          containers: [
            {
              name: "mysql"
              command: ["/usr/local/bin/start_mysql.sh"]
              volumeMounts: [
                {
                  name:      "tz-config"
                  mountPath: "/etc/localtime"
                  readOnly:  true
                },
                {
                  name:      "test-name-mysql"
                  mountPath: "/var/lib/mysql"
                }
              ]
              image:           "test-image"
              imagePullPolicy: "Always"
            }, {
              name: "sanitizer"
              command: ["/usr/local/bin/sanitize.sh"]
              volumeMounts: [
                {},                                        <--- NOTICE this is empty
                {
                  name:      "test-name-mysql"
                  mountPath: "/var/lib/mysql"
                }
              ]
              image:           "test-image"
              imagePullPolicy: "Always"
            }
          ]
        }
      }
      backoffLimit: 2
    }
  }
}

expected evaluation

deployment: {
  "test-name": {
    kind:       "Deployment"
    spec: {
      template: {
        spec: {
          containers: [
            {
              name: "mysql"
              command: ["/usr/local/bin/start_mysql.sh"]
              volumeMounts: [
                {
                  name:      "tz-config"
                  mountPath: "/etc/localtime"
                  readOnly:  true
                },
                {
                  name:      "test-name-mysql"
                  mountPath: "/var/lib/mysql"
                }
              ]
              image:           "test-image"
              imagePullPolicy: "Always"
            }, {
              name: "sanitizer"
              command: ["/usr/local/bin/sanitize.sh"]
              volumeMounts: [
                {
                  name:      "tz-config"
                  mountPath: "/etc/localtime"       <--- THIS is how it should look
                  readOnly:  true
                },
                {
                  name:      "test-name-mysql"
                  mountPath: "/var/lib/mysql"
                }
              ]
              image:           "test-image"
              imagePullPolicy: "Always"
            }
          ]
        }
      }
      backoffLimit: 2
    }
  }
}

[cueckoo]

Original reply by @verdverm in cuelang/cue#416 (comment)

containers: [...{ < put vol def here >}]

You've applied the template to the first element only and you want to apply a def to the entire list. This will look just like defining any constrained list, where you can apply other defs/vals to an existing def/val

containers: [...#myShema]
containers: volumeMoo: [...tzVolume]
containers: [...#prodPSP]

(this example does not perfectly align with what you have / want, it will depend on how you want to build up the final spec and pieces)