@@ -0,0 +1,49 @@
+package config
+
+import (
+	"fmt"
+
+	"github.com/stoewer/go-strcase"
+)
+
+type Fetcher int
+
+const (
+	UnknownFetcher = iota
+	Channel
+	ChannelNixpkgs
+	Download
+)
+
+func (f Fetcher) String() string {
+	switch f {
+	case Channel:
+		return "channel"
+	case ChannelNixpkgs:
+		return "channel-nixpkgs"
+	case Download:
+		return "download"
+	}
+
+	return fmt.Sprintf("Fetcher(%d)", f)
+}
+
+func parseFetcher(name string) (Fetcher, error) {
+	switch strcase.KebabCase(name) {
+	case "channel":
+		return Channel, nil
+	case "channel-nixpkgs":
+		return ChannelNixpkgs, nil
+	case "download":
+		return Download, nil
+	default:
+		return UnknownFetcher, fmt.Errorf("unsupported fetcher %s", name)
+	}
+}
+
+func (f *Fetcher) UnmarshalText(text []byte) error {
+	var err error
+	*f, err = parseFetcher(string(text))
+
+	return err
+}