Add entryPointPath option

cmd/golangBuild.go

@@ -450,6 +450,9 @@ func runGolangBuildPerArchitecture(config *golangBuildOptions, utils golangBuild
 	if len(ldflags) > 0 {
 		buildOptions = append(buildOptions, "-ldflags", ldflags)
 	}
+	if config.EntryPointPath != "" {
+		buildOptions = append(buildOptions, config.EntryPointPath)
+	}
 
 	if err := utils.RunExecutable("go", buildOptions...); err != nil {
 		log.Entry().Debugf("buildOptions: %v", buildOptions)

cmd/golangBuild_generated.go

@@ -45,6 +45,7 @@ type golangBuildOptions struct {
 	PrivateModules               string   `json:"privateModules,omitempty"`
 	PrivateModulesGitToken       string   `json:"privateModulesGitToken,omitempty"`
 	ArtifactVersion              string   `json:"artifactVersion,omitempty"`
+	EntryPointPath               string   `json:"entryPointPath,omitempty"`
 }
 
 type golangBuildCommonPipelineEnvironment struct {
@@ -236,6 +237,7 @@ func addGolangBuildFlags(cmd *cobra.Command, stepConfig *golangBuildOptions) {
 	cmd.Flags().StringVar(&stepConfig.PrivateModules, "privateModules", os.Getenv("PIPER_privateModules"), "Tells go which modules shall be considered to be private (by setting [GOPRIVATE](https://pkg.go.dev/cmd/go#hdr-Configuration_for_downloading_non_public_code)).")
 	cmd.Flags().StringVar(&stepConfig.PrivateModulesGitToken, "privateModulesGitToken", os.Getenv("PIPER_privateModulesGitToken"), "GitHub personal access token as per https://help.github.com/en/github/authenticating-to-github/creating-a-personal-access-token-for-the-command-line.")
 	cmd.Flags().StringVar(&stepConfig.ArtifactVersion, "artifactVersion", os.Getenv("PIPER_artifactVersion"), "Version of the artifact to be built.")
+	cmd.Flags().StringVar(&stepConfig.EntryPointPath, "entryPointPath", os.Getenv("PIPER_entryPointPath"), "Path to the file with main function. If empty, it is assumed that the main function is in the root of the project.")
 
 	cmd.MarkFlagRequired("targetArchitectures")
 }
@@ -497,6 +499,15 @@ func golangBuildMetadata() config.StepData {
 						Aliases:   []config.Alias{},
 						Default:   os.Getenv("PIPER_artifactVersion"),
 					},
+					{
+						Name:        "entryPointPath",
+						ResourceRef: []config.ResourceReference{},
+						Scope:       []string{"PARAMETERS", "STAGES", "STEPS"},
+						Type:        "string",
+						Mandatory:   false,
+						Aliases:     []config.Alias{},
+						Default:     os.Getenv("PIPER_entryPointPath"),
+					},
 				},
 			},
 			Containers: []config.Container{

cmd/golangBuild_test.go

@@ -84,6 +84,7 @@ func TestRunGolangBuild(t *testing.T) {
 	t.Run("success - no tests", func(t *testing.T) {
 		config := golangBuildOptions{
 			TargetArchitectures: []string{"linux,amd64"},
+			EntryPointPath:      "cmd/server.go",
 		}
 		utils := newGolangBuildTestsUtils()
 		telemetryData := telemetry.CustomData{}
@@ -91,7 +92,7 @@ func TestRunGolangBuild(t *testing.T) {
 		err := runGolangBuild(&config, &telemetryData, utils, &cpe)
 		assert.NoError(t, err)
 		assert.Equal(t, "go", utils.ExecMockRunner.Calls[0].Exec)
-		assert.Equal(t, []string{"build", "-trimpath"}, utils.ExecMockRunner.Calls[0].Params)
+		assert.Equal(t, []string{"build", "-trimpath", "cmd/server.go"}, utils.ExecMockRunner.Calls[0].Params)
 	})
 
 	t.Run("success - tests & ldflags", func(t *testing.T) {

resources/metadata/golangBuild.yaml

@@ -227,6 +227,13 @@ spec:
         resourceRef:
           - name: commonPipelineEnvironment
             param: artifactVersion
+      - name: entryPointPath
+        type: string
+        description: Path to the file with main function. If empty, it is assumed that the main function is in the root of the project.
+        scope:
+          - PARAMETERS
+          - STAGES
+          - STEPS
   outputs:
     resources:
       - name: commonPipelineEnvironment