[component] make Type implement MarshalText (#9856)

**Description:**
Adds `MarshalText` function so that `Type` can be properly marshaled as yaml.

**Link to tracking Issue:** Fixes #9855

.chloggen/fix-componets-command.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: component
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Fix issue where the `components` command wasn't properly printing the component type.
+
+# One or more tracking issues or pull requests related to the change
+issues: [9856]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

component/config.go

@@ -119,6 +119,11 @@ func (t Type) String() string {
 	return t.name
 }
 
+// MarshalText marshals returns the Type name.
+func (t Type) MarshalText() ([]byte, error) {
+	return []byte(t.name), nil
+}
+
 // typeRegexp is used to validate the type of a component.
 // A type must start with an ASCII alphabetic character and
 // can only contain ASCII alphanumeric characters and '_'.

otelcol/command_components_test.go

@@ -5,19 +5,17 @@ package otelcol
 
 import (
 	"bytes"
+	"os"
 	"path/filepath"
 	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"gopkg.in/yaml.v3"
 
 	"go.opentelemetry.io/collector/component"
 )
 
-var nopType = component.MustNewType("nop")
-
 func TestNewBuildSubCommand(t *testing.T) {
 	cfgProvider, err := NewConfigProvider(newDefaultConfigProviderSettings([]string{filepath.Join("testdata", "otelcol-nop.yaml")}))
 	require.NoError(t, err)
@@ -30,56 +28,7 @@ func TestNewBuildSubCommand(t *testing.T) {
 	cmd := NewCommand(set)
 	cmd.SetArgs([]string{"components"})
 
-	ExpectedYamlStruct := componentsOutput{
-		BuildInfo: component.NewDefaultBuildInfo(),
-		Receivers: []componentWithStability{{
-			Name: nopType,
-			Stability: map[string]string{
-				"logs":    "Stable",
-				"metrics": "Stable",
-				"traces":  "Stable",
-			},
-		}},
-		Processors: []componentWithStability{{
-			Name: nopType,
-			Stability: map[string]string{
-				"logs":    "Stable",
-				"metrics": "Stable",
-				"traces":  "Stable",
-			},
-		}},
-		Exporters: []componentWithStability{{
-			Name: nopType,
-			Stability: map[string]string{
-				"logs":    "Stable",
-				"metrics": "Stable",
-				"traces":  "Stable",
-			},
-		}},
-		Connectors: []componentWithStability{{
-			Name: nopType,
-			Stability: map[string]string{
-				"logs-to-logs":    "Development",
-				"logs-to-metrics": "Development",
-				"logs-to-traces":  "Development",
-
-				"metrics-to-logs":    "Development",
-				"metrics-to-metrics": "Development",
-				"metrics-to-traces":  "Development",
-
-				"traces-to-logs":    "Development",
-				"traces-to-metrics": "Development",
-				"traces-to-traces":  "Development",
-			},
-		}},
-		Extensions: []componentWithStability{{
-			Name: nopType,
-			Stability: map[string]string{
-				"extension": "Stable",
-			},
-		}},
-	}
-	ExpectedOutput, err := yaml.Marshal(ExpectedYamlStruct)
+	ExpectedOutput, err := os.ReadFile(filepath.Join("testdata", "components-output.yaml"))
 	require.NoError(t, err)
 
 	b := bytes.NewBufferString("")
@@ -89,5 +38,5 @@ func TestNewBuildSubCommand(t *testing.T) {
 
 	// Trim new line at the end of the two strings to make a better comparison as string() adds an extra new
 	// line that makes the test fail.
-	assert.Equal(t, strings.Trim(string(ExpectedOutput), "\n"), strings.Trim(b.String(), "\n"))
+	assert.Equal(t, strings.ReplaceAll(strings.ReplaceAll(string(ExpectedOutput), "\n", ""), "\r", ""), strings.ReplaceAll(strings.ReplaceAll(b.String(), "\n", ""), "\r", ""))
 }

otelcol/testdata/components-output.yaml

@@ -0,0 +1,38 @@
+buildinfo:
+    command: otelcol
+    description: OpenTelemetry Collector
+    version: latest
+receivers:
+    - name: nop
+      stability:
+        logs: Stable
+        metrics: Stable
+        traces: Stable
+processors:
+    - name: nop
+      stability:
+        logs: Stable
+        metrics: Stable
+        traces: Stable
+exporters:
+    - name: nop
+      stability:
+        logs: Stable
+        metrics: Stable
+        traces: Stable
+connectors:
+    - name: nop
+      stability:
+        logs-to-logs: Development
+        logs-to-metrics: Development
+        logs-to-traces: Development
+        metrics-to-logs: Development
+        metrics-to-metrics: Development
+        metrics-to-traces: Development
+        traces-to-logs: Development
+        traces-to-metrics: Development
+        traces-to-traces: Development
+extensions:
+    - name: nop
+      stability:
+        extension: Stable