Introduce Params and Results into StepActions CRD

This PR introduces `params` and `results` into the `StepAction` CRD. It allows the `StepAction` to declare the params it needs and the results it will produce. The follow up PRs will contain the interaction of how a `Task` referencing the `StepAction` resolves them. All the tests were borrowed from `pkg/apis/pipeline/v1/...` that overlapped with `paramSpec` and `Results`.
tektoncd · Nov 2, 2023 · 30d58c8 · 30d58c8
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diff --git a/docs/pipeline-api.md b/docs/pipeline-api.md
@@ -1696,7 +1696,7 @@ parameter.</p>
 <h3 id="tekton.dev/v1.ParamSpecs">ParamSpecs
 (<code>[]github.com/tektoncd/pipeline/pkg/apis/pipeline/v1.ParamSpec</code> alias)</h3>
 <p>
-(<em>Appears on:</em><a href="#tekton.dev/v1.PipelineSpec">PipelineSpec</a>, <a href="#tekton.dev/v1.TaskSpec">TaskSpec</a>)
+(<em>Appears on:</em><a href="#tekton.dev/v1.PipelineSpec">PipelineSpec</a>, <a href="#tekton.dev/v1.TaskSpec">TaskSpec</a>, <a href="#tekton.dev/v1alpha1.StepActionSpec">StepActionSpec</a>)
 </p>
 <div>
 <p>ParamSpecs is a list of ParamSpec</p>
@@ -3201,7 +3201,7 @@ this field is false and so declared workspaces are required.</p>
 <h3 id="tekton.dev/v1.PropertySpec">PropertySpec
 </h3>
 <p>
-(<em>Appears on:</em><a href="#tekton.dev/v1.ParamSpec">ParamSpec</a>, <a href="#tekton.dev/v1.TaskResult">TaskResult</a>)
+(<em>Appears on:</em><a href="#tekton.dev/v1.ParamSpec">ParamSpec</a>, <a href="#tekton.dev/v1.TaskResult">TaskResult</a>, <a href="#tekton.dev/v1alpha1.StepActionResult">StepActionResult</a>)
 </p>
 <div>
 <p>PropertySpec defines the struct for object keys</p>
@@ -6541,6 +6541,34 @@ string
 <p>If Script is not empty, the Step cannot have an Command and the Args will be passed to the Script.</p>
 </td>
 </tr>
+<tr>
+<td>
+<code>Params</code><br/>
+<em>
+<a href="#tekton.dev/v1.ParamSpecs">
+ParamSpecs
+</a>
+</em>
+</td>
+<td>
+<em>(Optional)</em>
+<p>Params is a list of input parameters required to run the stepAction.
+Params must be supplied as inputs in Steps unless they declare a defaultvalue.</p>
+</td>
+</tr>
+<tr>
+<td>
+<code>Results</code><br/>
+<em>
+<a href="#tekton.dev/v1alpha1.StepActionResult">
+[]StepActionResult
+</a>
+</em>
+</td>
+<td>
+<p>Results are values that this StepAction can output</p>
+</td>
+</tr>
 </table>
 </td>
 </tr>
@@ -7024,6 +7052,18 @@ Hub resource: <a href="https://artifacthub.io/*">https://artifacthub.io/*</a>,</
 </tr>
 </tbody>
 </table>
+<h3 id="tekton.dev/v1alpha1.ResultsType">ResultsType
+(<code>string</code> alias)</h3>
+<p>
+(<em>Appears on:</em><a href="#tekton.dev/v1alpha1.StepActionResult">StepActionResult</a>)
+</p>
+<div>
+<p>ResultsType indicates the type of a result;
+Used to distinguish between a single string and an array of strings.
+Note that there is ResultType used to find out whether a
+RunResult is from a task result or not, which is different from
+this ResultsType.</p>
+</div>
 <h3 id="tekton.dev/v1alpha1.RunReason">RunReason
 (<code>string</code> alias)</h3>
 <div>
@@ -7206,6 +7246,76 @@ Refer Go&rsquo;s ParseDuration documentation for expected format: <a href="https
 <div>
 <p>StepActionObject is implemented by StepAction</p>
 </div>
+<h3 id="tekton.dev/v1alpha1.StepActionResult">StepActionResult
+</h3>
+<p>
+(<em>Appears on:</em><a href="#tekton.dev/v1alpha1.StepActionSpec">StepActionSpec</a>)
+</p>
+<div>
+<p>StepActionResult used to describe the results of a task</p>
+</div>
+<table>
+<thead>
+<tr>
+<th>Field</th>
+<th>Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>
+<code>name</code><br/>
+<em>
+string
+</em>
+</td>
+<td>
+<p>Name the given name</p>
+</td>
+</tr>
+<tr>
+<td>
+<code>type</code><br/>
+<em>
+<a href="#tekton.dev/v1alpha1.ResultsType">
+ResultsType
+</a>
+</em>
+</td>
+<td>
+<em>(Optional)</em>
+<p>Type is the user-specified type of the result. The possible type
+is currently &ldquo;string&rdquo; and will support &ldquo;array&rdquo; in following work.</p>
+</td>
+</tr>
+<tr>
+<td>
+<code>properties</code><br/>
+<em>
+<a href="#tekton.dev/v1.PropertySpec">
+map[string]github.com/tektoncd/pipeline/pkg/apis/pipeline/v1.PropertySpec
+</a>
+</em>
+</td>
+<td>
+<em>(Optional)</em>
+<p>Properties is the JSON Schema properties to support key-value pairs results.</p>
+</td>
+</tr>
+<tr>
+<td>
+<code>description</code><br/>
+<em>
+string
+</em>
+</td>
+<td>
+<em>(Optional)</em>
+<p>Description is a human-readable description of the result</p>
+</td>
+</tr>
+</tbody>
+</table>
 <h3 id="tekton.dev/v1alpha1.StepActionSpec">StepActionSpec
 </h3>
 <p>
@@ -7301,6 +7411,34 @@ string
 <p>If Script is not empty, the Step cannot have an Command and the Args will be passed to the Script.</p>
 </td>
 </tr>
+<tr>
+<td>
+<code>Params</code><br/>
+<em>
+<a href="#tekton.dev/v1.ParamSpecs">
+ParamSpecs
+</a>
+</em>
+</td>
+<td>
+<em>(Optional)</em>
+<p>Params is a list of input parameters required to run the stepAction.
+Params must be supplied as inputs in Steps unless they declare a defaultvalue.</p>
+</td>
+</tr>
+<tr>
+<td>
+<code>Results</code><br/>
+<em>
+<a href="#tekton.dev/v1alpha1.StepActionResult">
+[]StepActionResult
+</a>
+</em>
+</td>
+<td>
+<p>Results are values that this StepAction can output</p>
+</td>
+</tr>
 </tbody>
 </table>
 <h3 id="tekton.dev/v1alpha1.VerificationPolicySpec">VerificationPolicySpec

diff --git a/docs/stepactions.md b/docs/stepactions.md
@@ -38,6 +38,8 @@ A `StepAction` definition supports the following fields:
   - `script`
     - cannot be used at the same time as using `command`.
   - `env`
+  - [`params`](#declaring-params)
+  - [`results`](#declaring-results)
 
 The non-functional example below demonstrates the use of most of the above-mentioned fields:
 
@@ -55,6 +57,62 @@ spec:
   args: ["-lh"]
 ```
 
+### Declaring Parameters
+
+Like with `Tasks`, a `StepAction` must declare all the parameters that it used. The same rules for `Parameter` [name](./tasks.md/#parameter-name), [type](./tasks.md/#parameter-type) (including [object](./tasks.md/#object-type), [array](./tasks.md/#array-type) and [string](./tasks.md/#string-type)) apply as when declaring them in `Tasks`. A `StepAction` can also provide [default value](./tasks.md/#default-value) to a `Parameter`. 
+
+ `Parameters` are passed to the `StepAction` from its corresponding `Step` referencing it.
+
+```yaml
+apiVersion: tekton.dev/v1alpha1
+kind: StepAction
+metadata:
+  name: stepaction-using-params
+spec:
+  params:
+    - name: gitrepo
+      type: object
+      properties:
+        url:
+          type: string
+        commit:
+          type: string
+    - name: flags
+      type: array
+    - name: outputPath
+      type: string
+      default: "/workspace"
+  image: some-git-image
+  args: [
+    "-url=$(params.gitrepo.url)",
+    "-revision=$(params.gitrepo.commit)",
+    "-output=$(params.outputPath)",
+    "$(params.flags[*])",
+  ]
+```
+
+### Declaring Results
+
+A `StepAction` also declares the results that it will emit. 
+
+```yaml
+apiVersion: tekton.dev/v1alpha1
+kind: StepAction
+metadata:
+  name: stepaction-declaring-results
+spec:
+  results:
+    - name: current-date-unix-timestamp
+      description: The current date in unix timestamp format
+    - name: current-date-human-readable
+      description: The current date in human readable format
+  image: bash:latest
+  script: |
+    #!/usr/bin/env bash
+    date +%s | tee $(results.current-date-unix-timestamp.path)
+    date | tee $(results.current-date-human-readable.path)
+```
+
 ## Referencing a StepAction
 
 `StepActions` can be referenced from the `Step` using the `ref` field, as follows:

diff --git a/hack/ignored-openapi-violations.list b/hack/ignored-openapi-violations.list
@@ -38,6 +38,12 @@ API rule violation: names_match,github.com/tektoncd/pipeline/pkg/apis/pipeline/v
 API rule violation: names_match,github.com/tektoncd/pipeline/pkg/apis/pipeline/v1beta1,StepTemplate,DeprecatedTerminationMessagePath
 API rule violation: names_match,github.com/tektoncd/pipeline/pkg/apis/pipeline/v1beta1,StepTemplate,DeprecatedTerminationMessagePolicy
 API rule violation: names_match,github.com/tektoncd/pipeline/pkg/apis/resolution/v1alpha1,ResolutionRequestSpec,Parameters
+API rule violation: names_match,github.com/tektoncd/pipeline/pkg/apis/pipeline/v1alpha1,ParamValue,ArrayVal
+API rule violation: names_match,github.com/tektoncd/pipeline/pkg/apis/pipeline/v1alpha1,ParamValue,ObjectVal
+API rule violation: names_match,github.com/tektoncd/pipeline/pkg/apis/pipeline/v1alpha1,ParamValue,StringVal
+API rule violation: names_match,github.com/tektoncd/pipeline/pkg/apis/pipeline/v1alpha1,ParamValue,Type
+API rule violation: names_match,github.com/tektoncd/pipeline/pkg/apis/pipeline/v1alpha1,StepActionSpec,Params
+API rule violation: names_match,github.com/tektoncd/pipeline/pkg/apis/pipeline/v1alpha1,StepActionSpec,Results
 API rule violation: list_type_missing,github.com/tektoncd/pipeline/pkg/apis/pipeline/v1alpha1,RunSpec,Workspaces
 API rule violation: list_type_missing,github.com/tektoncd/pipeline/pkg/apis/pipeline/v1alpha1,VerificationPolicySpec,Authorities
 API rule violation: list_type_missing,github.com/tektoncd/pipeline/pkg/apis/pipeline/v1alpha1,VerificationPolicySpec,Resources
diff --git a/pkg/apis/pipeline/v1/param_types.go b/pkg/apis/pipeline/v1/param_types.go
@@ -103,17 +103,17 @@ func (pp *ParamSpec) setDefaultsForProperties() {
 	}
 }
 
-// getNames returns all the names of the declared parameters
-func (ps ParamSpecs) getNames() []string {
+// GetNames returns all the names of the declared parameters
+func (ps ParamSpecs) GetNames() []string {
 	var names []string
 	for _, p := range ps {
 		names = append(names, p.Name)
 	}
 	return names
 }
 
-// sortByType splits the input params into string params, array params, and object params, in that order
-func (ps ParamSpecs) sortByType() (ParamSpecs, ParamSpecs, ParamSpecs) {
+// SortByType splits the input params into string params, array params, and object params, in that order
+func (ps ParamSpecs) SortByType() (ParamSpecs, ParamSpecs, ParamSpecs) {
 	var stringParams, arrayParams, objectParams ParamSpecs
 	for _, p := range ps {
 		switch p.Type {
@@ -130,9 +130,9 @@ func (ps ParamSpecs) sortByType() (ParamSpecs, ParamSpecs, ParamSpecs) {
 	return stringParams, arrayParams, objectParams
 }
 
-// validateNoDuplicateNames returns an error if any of the params have the same name
-func (ps ParamSpecs) validateNoDuplicateNames() *apis.FieldError {
-	names := ps.getNames()
+// ValidateNoDuplicateNames returns an error if any of the params have the same name
+func (ps ParamSpecs) ValidateNoDuplicateNames() *apis.FieldError {
+	names := ps.GetNames()
 	seen := sets.String{}
 	dups := sets.String{}
 	var errs *apis.FieldError

diff --git a/pkg/apis/pipeline/v1/pipeline_validation.go b/pkg/apis/pipeline/v1/pipeline_validation.go
@@ -394,9 +394,9 @@ func (ps *PipelineSpec) validatePipelineParameterUsage(ctx context.Context) (err
 
 // validatePipelineTaskParameterUsage validates that parameters referenced in the Pipeline Tasks are declared by the Pipeline
 func validatePipelineTaskParameterUsage(tasks []PipelineTask, params ParamSpecs) (errs *apis.FieldError) {
-	allParamNames := sets.NewString(params.getNames()...)
-	_, arrayParams, objectParams := params.sortByType()
-	arrayParamNames := sets.NewString(arrayParams.getNames()...)
+	allParamNames := sets.NewString(params.GetNames()...)
+	_, arrayParams, objectParams := params.SortByType()
+	arrayParamNames := sets.NewString(arrayParams.GetNames()...)
 	objectParameterNameKeys := map[string][]string{}
 	for _, p := range objectParams {
 		for k := range p.Properties {
@@ -437,7 +437,7 @@ func validatePipelineTasksWorkspacesUsage(wss []PipelineWorkspaceDeclaration, pt
 func ValidatePipelineParameterVariables(ctx context.Context, tasks []PipelineTask, params ParamSpecs) (errs *apis.FieldError) {
 	// validates all the types within a slice of ParamSpecs
 	errs = errs.Also(ValidateParameterTypes(ctx, params).ViaField("params"))
-	errs = errs.Also(params.validateNoDuplicateNames())
+	errs = errs.Also(params.ValidateNoDuplicateNames())
 	for i, task := range tasks {
 		errs = errs.Also(task.Params.validateDuplicateParameters().ViaField("params").ViaIndex(i))
 	}

diff --git a/pkg/apis/pipeline/v1/task_validation.go b/pkg/apis/pipeline/v1/task_validation.go
@@ -129,16 +129,16 @@ func (ts *TaskSpec) ValidateBetaFields(ctx context.Context) *apis.FieldError {
 // ValidateUsageOfDeclaredParameters validates that all parameters referenced in the Task are declared by the Task.
 func ValidateUsageOfDeclaredParameters(ctx context.Context, steps []Step, params ParamSpecs) *apis.FieldError {
 	var errs *apis.FieldError
-	_, _, objectParams := params.sortByType()
-	allParameterNames := sets.NewString(params.getNames()...)
+	_, _, objectParams := params.SortByType()
+	allParameterNames := sets.NewString(params.GetNames()...)
 	errs = errs.Also(validateVariables(ctx, steps, "params", allParameterNames))
 	errs = errs.Also(validateObjectUsage(ctx, steps, objectParams))
-	errs = errs.Also(validateObjectParamsHaveProperties(ctx, params))
+	errs = errs.Also(ValidateObjectParamsHaveProperties(ctx, params))
 	return errs
 }
 
-// validateObjectParamsHaveProperties returns an error if any declared object params are missing properties
-func validateObjectParamsHaveProperties(ctx context.Context, params ParamSpecs) *apis.FieldError {
+// ValidateObjectParamsHaveProperties returns an error if any declared object params are missing properties
+func ValidateObjectParamsHaveProperties(ctx context.Context, params ParamSpecs) *apis.FieldError {
 	var errs *apis.FieldError
 	for _, p := range params {
 		if p.Type == ParamTypeObject && p.Properties == nil {
@@ -434,11 +434,11 @@ func (p ParamSpec) ValidateObjectType(ctx context.Context) *apis.FieldError {
 // ValidateParameterVariables validates all variables within a slice of ParamSpecs against a slice of Steps
 func ValidateParameterVariables(ctx context.Context, steps []Step, params ParamSpecs) *apis.FieldError {
 	var errs *apis.FieldError
-	errs = errs.Also(params.validateNoDuplicateNames())
-	stringParams, arrayParams, objectParams := params.sortByType()
-	stringParameterNames := sets.NewString(stringParams.getNames()...)
-	arrayParameterNames := sets.NewString(arrayParams.getNames()...)
-	errs = errs.Also(validateNameFormat(stringParameterNames.Insert(arrayParameterNames.List()...), objectParams))
+	errs = errs.Also(params.ValidateNoDuplicateNames())
+	stringParams, arrayParams, objectParams := params.SortByType()
+	stringParameterNames := sets.NewString(stringParams.GetNames()...)
+	arrayParameterNames := sets.NewString(arrayParams.GetNames()...)
+	errs = errs.Also(ValidateNameFormat(stringParameterNames.Insert(arrayParameterNames.List()...), objectParams))
 	return errs.Also(validateArrayUsage(steps, "params", arrayParameterNames))
 }
 
@@ -559,8 +559,8 @@ func validateVariables(ctx context.Context, steps []Step, prefix string, vars se
 	return errs
 }
 
-// validateNameFormat validates that the name format of all param types follows the rules
-func validateNameFormat(stringAndArrayParams sets.String, objectParams []ParamSpec) (errs *apis.FieldError) {
+// ValidateNameFormat validates that the name format of all param types follows the rules
+func ValidateNameFormat(stringAndArrayParams sets.String, objectParams []ParamSpec) (errs *apis.FieldError) {
 	// checking string or array name format
 	// ----
 	invalidStringAndArrayNames := []string{}