blueprint: DeepCopy() cannot fail

Don't return an error value, as it is always nil.

Signed-off-by: Tom Gundersen <teg@jklm.no>

internal/blueprint/blueprint.go

@@ -40,7 +40,7 @@ type Group struct {
 
 // DeepCopy returns a deep copy of the blueprint
 // This uses json.Marshal and Unmarshal which are not very efficient
-func (b *Blueprint) DeepCopy() (Blueprint, error) {
+func (b *Blueprint) DeepCopy() Blueprint {
 	bpJSON, err := json.Marshal(b)
 	if err != nil {
 		panic(err)
@@ -51,7 +51,7 @@ func (b *Blueprint) DeepCopy() (Blueprint, error) {
 	if err != nil {
 		panic(err)
 	}
-	return bp, nil
+	return bp
 }
 
 // Initialize ensures that the blueprint has sane defaults for any missing fields

internal/blueprint/blueprint_test.go

@@ -18,8 +18,7 @@ func TestDeepCopy(t *testing.T) {
 			{Name: "dep-package2", Version: "*"}},
 	}
 
-	bpCopy, err := bpOrig.DeepCopy()
-	require.NoError(t, err)
+	bpCopy := bpOrig.DeepCopy()
 	require.Equalf(t, bpOrig, bpCopy, "Blueprints.DeepCopy is different from original.")
 
 	// Modify the copy