Add a backups abstraction.

state/backups/backups.go

@@ -7,6 +7,24 @@ package backups
 
 import (
 	"github.com/juju/loggo"
+	"github.com/juju/utils/filestorage"
 )
 
 var logger = loggo.GetLogger("juju.state.backups")
+
+// Backups is an abstraction around all juju backup-related functionality.
+type Backups interface {
+}
+
+type backups struct {
+	storage filestorage.FileStorage
+}
+
+// NewBackups returns a new Backups value using the provided DB info and
+// file storage.
+func NewBackups(stor filestorage.FileStorage) Backups {
+	b := backups{
+		storage: stor,
+	}
+	return &b
+}

state/backups/backups_test.go

@@ -0,0 +1,37 @@
+// Copyright 2013,2014 Canonical Ltd.
+// Licensed under the AGPLv3, see LICENCE file for details.
+
+package backups_test
+
+import (
+	"github.com/juju/utils/filestorage"
+	gc "launchpad.net/gocheck"
+
+	"github.com/juju/juju/state/backups"
+	"github.com/juju/juju/testing"
+)
+
+type backupsSuite struct {
+	testing.BaseSuite
+
+	storage filestorage.FileStorage
+	api     backups.Backups
+}
+
+var _ = gc.Suite(&backupsSuite{}) // Register the suite.
+
+func (s *backupsSuite) SetUpTest(c *gc.C) {
+	s.BaseSuite.SetUpTest(c)
+
+	storage, err := filestorage.NewSimpleStorage(c.MkDir())
+	c.Assert(err, gc.IsNil)
+	s.storage = storage
+
+	s.api = backups.NewBackups(s.storage)
+}
+
+func (s *backupsSuite) TestNewBackups(c *gc.C) {
+	api := backups.NewBackups(s.storage)
+
+	c.Check(api, gc.NotNil)
+}