Clean up version: null from "k0sctl init" output (#641)

Signed-off-by: Kimmo Lehto <[email protected]>

Author: kke

phase/default_k0s_version.go

@@ -21,7 +21,7 @@ func (p *DefaultK0sVersion) Title() string {
 }
 
 func (p *DefaultK0sVersion) Run() error {
-	isStable := p.Config.Spec.K0s.VersionChannel == "stable"
+	isStable := p.Config.Spec.K0s.VersionChannel == "" || p.Config.Spec.K0s.VersionChannel == "stable"
 
 	var msg string
 	if isStable {

pkg/apis/k0sctl.k0sproject.io/v1beta1/cluster/k0s.go

@@ -31,10 +31,10 @@ var (
 
 // K0s holds configuration for bootstraping a k0s cluster
 type K0s struct {
-	Version        *version.Version `yaml:"version"`
-	VersionChannel string           `yaml:"versionChannel" default:"stable"`
-	DynamicConfig  bool             `yaml:"dynamicConfig"`
-	Config         dig.Mapping      `yaml:"config"`
+	Version        *version.Version `yaml:"version,omitempty"`
+	VersionChannel string           `yaml:"versionChannel,omitempty"`
+	DynamicConfig  bool             `yaml:"dynamicConfig,omitempty" default:"false"`
+	Config         dig.Mapping      `yaml:"config,omitempty"`
 	Metadata       K0sMetadata      `yaml:"-"`
 }
 
@@ -56,6 +56,26 @@ func (k *K0s) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	return defaults.Set(k)
 }
 
+// MarshalYAML implements yaml.Marshaler interface
+func (k *K0s) MarshalYAML() (interface{}, error) {
+	if k == nil {
+		return nil, nil
+	}
+	type k0s K0s
+	yk := (*k0s)(k)
+
+	yml, err := yaml.Marshal(yk)
+	if err != nil {
+		return nil, fmt.Errorf("marshal k0s: %w", err)
+	}
+
+	if string(yml) == "{}\n" {
+		return nil, nil
+	}
+
+	return yk, nil
+}
+
 // SetDefaults sets default values
 func (k *K0s) SetDefaults() {
 	if k.Version == nil {
@@ -88,7 +108,7 @@ func (k *K0s) Validate() error {
 	return validation.ValidateStruct(k,
 		validation.Field(&k.Version, validation.By(validateVersion)),
 		validation.Field(&k.DynamicConfig, validation.By(k.validateMinDynamic())),
-		validation.Field(&k.VersionChannel, validation.In("stable", "latest")),
+		validation.Field(&k.VersionChannel, validation.In("stable", "latest"), validation.When(k.VersionChannel != "")),
 	)
 }
 

pkg/apis/k0sctl.k0sproject.io/v1beta1/cluster/spec.go

@@ -9,8 +9,8 @@ import (
 
 // Spec defines cluster config spec section
 type Spec struct {
-	Hosts Hosts `yaml:"hosts"`
-	K0s   *K0s  `yaml:"k0s"`
+	Hosts Hosts `yaml:"hosts,omitempty"`
+	K0s   *K0s  `yaml:"k0s,omitempty"`
 
 	k0sLeader *Host
 }
@@ -28,6 +28,19 @@ func (s *Spec) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	return defaults.Set(s)
 }
 
+// MarshalYAML implements yaml.Marshaler interface
+func (s *Spec) MarshalYAML() (interface{}, error) {
+	k0s, err := s.K0s.MarshalYAML()
+	if err != nil {
+		return nil, err
+	}
+	if k0s == nil {
+		return Spec{Hosts: s.Hosts}, nil
+	}
+
+	return s, nil
+}
+
 // SetDefaults sets defaults
 func (s *Spec) SetDefaults() {
 	if s.K0s == nil {