// validation.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ObjectMeta metadata = 1;

  // Spec for the ResourceClaim. The entire content is copied unchanged
  // into the ResourceClaim that gets created from this template. The
  // same fields as in a ResourceClaim are also valid here.
  optional ResourceClaimSpec spec = 2;
}

  // For many clients the singular form of the resource will be more understandable to users reading messages and should be used when integrating the name of the resource into a sentence.
  // The command line tool kubectl, for example, allows use of the singular resource name in place of plurals.
  // The singular form of a resource should always be an optional element - when in doubt use the canonical resource name.

  //
  // Requests for TLS serving certificates typically request: "key encipherment", "digital signature", "server auth".
  //
  // Valid values are:
  //  "signing", "digital signature", "content commitment",
  //  "key encipherment", "key agreement", "data encipherment",
  //  "cert sign", "crl sign", "encipher only", "decipher only", "any",
  //  "server auth", "client auth",

  // See:
  // 	https://tools.ietf.org/html/rfc5280#section-4.2.1.3
  // 	https://tools.ietf.org/html/rfc5280#section-4.2.1.12
  //
  // Valid values are:
  //  "signing",
  //  "digital signature",
  //  "content commitment",
  //  "key encipherment",
  //  "key agreement",
  //  "data encipherment",
  //  "cert sign",
  //  "crl sign",
  //  "encipher only",
  //  "decipher only",
  //  "any",

  // As Kubernetes 1.15 doesn't support this field, drivers can only support one mode when
  // deployed on such a cluster and the deployment determines which mode that is, for example
  // via a command line parameter of the driver.
  //
  // This field is immutable.
  //
  // +optional
  optional bool podInfoOnMount = 2;

  // volumeLifecycleModes defines what kind of volumes this CSI volume driver supports.

  // The path to the field that refers the expression.
  // For example, the reference to the expression of the first item of
  // validations is "spec.validations[0].expression"
  optional string fieldRef = 2;

  // The content of type checking information in a human-readable form.
  // Each line of the warning contains the type that the expression is checked
  // against, followed by the type check error from the compiler.
  optional string warning = 3;

// +k8s:deepcopy-gen=true
// +k8s:openapi-gen=true
message Quantity {
  optional string string = 1;
}

// QuantityValue makes it possible to use a Quantity as value for a command
// line parameter.
//
// +protobuf=true
// +protobuf.embed=string
// +protobuf.options.marshal=false
// +protobuf.options.(gogoproto.goproto_stringer)=false
// +k8s:deepcopy-gen=true

  // +optional
  optional string host = 2;
}

// ExecAction describes a "run in container" action.
message ExecAction {
  // Command is the command line to execute inside the container, the working directory for the
  // command  is root ('/') in the container's filesystem. The command is simply exec'd, it is
  // not run inside a shell, so traditional shell instructions ('|', etc) won't work. To use

  // As Kubernetes 1.15 doesn't support this field, drivers can only support one mode when
  // deployed on such a cluster and the deployment determines which mode that is, for example
  // via a command line parameter of the driver.
  //
  // This field is immutable.
  //
  // +optional
  optional bool podInfoOnMount = 2;

  // volumeLifecycleModes defines what kind of volumes this CSI volume driver supports.