added new types for primitves

this types like WWbool are needed so that they can
have their own command line parses which allows a UNDEF
for e.g. bool or ints.

Signed-off-by: Christian Goll <cgoll@suse.com>

internal/pkg/wwtype/constants.go

@@ -0,0 +1,5 @@
+package wwtype
+
+func GetUnsetVerbs() []string {
+	return []string{"UNSET", "DELETE", "UNDEF", "undef", "--", "nil", "0.0.0.0"}
+}

internal/pkg/wwtype/wwbool.go

@@ -0,0 +1,86 @@
+package wwtype
+
+import (
+	"strconv"
+	"strings"
+
+	"github.com/warewulf/warewulf/internal/pkg/util"
+)
+
+/*
+Type for holding a simple bool, but which can be set via the UNSET parameter
+*/
+type WWbool struct {
+	bool         // the actual value
+	isset   bool // only true if set through yaml or set, so that false can go to disk
+	delnext bool // delete after next iteraion
+}
+
+// Yaml marshaler, calls this to find out, if going to disk
+func (b WWbool) IsZero() bool {
+	return !b.isset
+}
+
+func (b *WWbool) String() string {
+	return strconv.FormatBool(b.bool)
+}
+
+func (b *WWbool) Set(str string) error {
+	if util.InSlice(GetUnsetVerbs(), str) {
+		b.bool = false
+		b.isset = true
+		b.delnext = true
+		return nil
+	}
+
+	if strings.ToLower(str) == "yes" || str == "" {
+		b.bool = true
+		b.isset = true
+		return nil
+	}
+	if strings.ToLower(str) == "no" {
+		b.bool = false
+		b.isset = true
+		return nil
+	}
+	var err error
+	b.bool, err = strconv.ParseBool(str)
+	if err == nil {
+		b.isset = true
+	}
+	return err
+}
+
+func (b *WWbool) Type() string {
+	return "WWbool"
+}
+
+func (b WWbool) MarshalBinary() (buf []byte, err error) {
+	strconv.AppendBool(buf, b.bool)
+	return buf, nil
+}
+
+func (b *WWbool) UnmarshalBinary(data []byte) (err error) {
+	b.bool, err = strconv.ParseBool(string(data))
+	return err
+}
+func (b WWbool) MarshalText() (buf []byte, err error) {
+	if b.bool {
+		buf = append(buf, "true"...)
+	} else if !b.delnext {
+		buf = append(buf, "false"...)
+	} else {
+		buf = append(buf, "delete"...)
+	}
+	return buf, nil
+}
+
+func (b *WWbool) UnmarshalText(data []byte) (err error) {
+	if strings.EqualFold(string(data), "delete") {
+		b.isset = false
+		b.bool = false
+		return nil
+	}
+	b.isset = true
+	return b.Set(string(data))
+}