Add doc comments

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

collection.go

@@ -58,6 +58,7 @@ func (c *Collection) unmarshal(strSlice []string) error {
 	return nil
 }
 
+// UnmarshalText implements the json.Marshaler interface.
 func (c *Collection) MarshalJSON() ([]byte, error) {
 	strSlice, err := c.marshal()
 	if err != nil {
@@ -66,6 +67,7 @@ func (c *Collection) MarshalJSON() ([]byte, error) {
 	return json.Marshal(strSlice)
 }
 
+// UnmarshalJSON implements the json.Unmarshaler interface.
 func (c *Collection) UnmarshalJSON(data []byte) error {
 	var strSlice []string
 	if err := json.Unmarshal(data, &strSlice); err != nil {
@@ -74,10 +76,12 @@ func (c *Collection) UnmarshalJSON(data []byte) error {
 	return c.unmarshal(strSlice)
 }
 
+// MarshalYAML implements the yaml.Marshaler interface.
 func (c *Collection) MarshalYAML() (interface{}, error) {
 	return c.marshal()
 }
 
+// UnmarshalYAML implements the yaml.Unmarshaler interface.
 func (c *Collection) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	var strSlice []string
 	if err := unmarshal(&strSlice); err != nil {

version.go

@@ -110,10 +110,12 @@ func (v *Version) Compare(b *Version) int {
 	return 1
 }
 
+// MarshalJSON implements the json.Marshaler interface.
 func (v *Version) MarshalJSON() ([]byte, error) {
 	return []byte(fmt.Sprintf("\"%s\"", v.String())), nil
 }
 
+// MarshalYAML implements the yaml.Marshaler interface.
 func (v *Version) MarshalYAML() (interface{}, error) {
 	return v.String(), nil
 }
@@ -131,10 +133,12 @@ func (v *Version) unmarshal(f func(interface{}) error) error {
 	return nil
 }
 
+// UnmarshalYAML implements the yaml.Unmarshaler interface.
 func (v *Version) UnmarshalYAML(f func(interface{}) error) error {
 	return v.unmarshal(f)
 }
 
+// UnmarshalJSON implements the json.Unmarshaler interface.
 func (v *Version) UnmarshalJSON(b []byte) error {
 	s := strings.TrimSpace(strings.Trim(string(b), "\""))
 	return v.unmarshal(func(i interface{}) error {
@@ -143,7 +147,7 @@ func (v *Version) UnmarshalJSON(b []byte) error {
 	})
 }
 
-// NewVersion creates a new k0s version from a string
+// NewVersion returns a new Version created from the supplied string or an error if the string is not a valid version number
 func NewVersion(v string) (*Version, error) {
 	n, err := goversion.NewVersion(strings.TrimPrefix(v, "v"))
 	if err != nil {