commands: add implementations for create, use, rm, stop

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

store/util.go

@@ -0,0 +1,32 @@
+package store
+
+import (
+	"os"
+	"strings"
+
+	"github.com/docker/docker/pkg/namesgenerator"
+	"github.com/pkg/errors"
+)
+
+func ValidateName(s string) (string, error) {
+	if !namePattern.MatchString(s) {
+		return "", errors.Errorf("invalid name %s, name needs to start with a letter and may not contain symbols, except ._-", s)
+	}
+	return strings.ToLower(s), nil
+}
+
+func GenerateName(txn *Txn) (string, error) {
+	var name string
+	for i := 0; i < 6; i++ {
+		name = namesgenerator.GetRandomName(i)
+		if _, err := txn.NodeGroupByName(name); err != nil {
+			if !os.IsNotExist(errors.Cause(err)) {
+				return "", err
+			}
+		} else {
+			continue
+		}
+		return name, nil
+	}
+	return "", errors.Errorf("failed to generate random name")
+}