virtcontainers: store: Add a Delete API

It's going to be used to completely clean a Store away.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

virtcontainers/store/backend.go

@@ -45,6 +45,7 @@ func newBackend(scheme string) (backend, error) {
 
 type backend interface {
 	new(ctx context.Context, path string, host string) error
+	delete() error
 	load(item Item, data interface{}) error
 	store(item Item, data interface{}) error
 }

virtcontainers/store/filesystem_backend.go

@@ -173,8 +173,8 @@ func (f *filesystem) new(ctx context.Context, path string, host string) error {
 	return f.initialize()
 }
 
-func (f *filesystem) delete() {
-	os.RemoveAll(f.path)
+func (f *filesystem) delete() error {
+	return os.RemoveAll(f.path)
 }
 
 func (f *filesystem) load(item Item, data interface{}) error {

virtcontainers/store/filesystem_backend_test.go

@@ -8,6 +8,7 @@ package store
 import (
 	"context"
 	"io/ioutil"
+	"os"
 	"path/filepath"
 	"testing"
 
@@ -64,3 +65,25 @@ func TestStoreFilesystemLoad(t *testing.T) {
 	assert.Nil(t, err)
 	assert.Equal(t, newData, data)
 }
+
+func TestStoreFilesystemDelete(t *testing.T) {
+	f := filesystem{}
+
+	err := f.new(context.Background(), rootPath, "")
+	assert.Nil(t, err)
+
+	data := TestNoopStructure{
+		Field1: "value1",
+		Field2: "value2",
+	}
+
+	// Store test data
+	err = f.store(State, data)
+	assert.Nil(t, err)
+
+	err = f.delete()
+	assert.Nil(t, err)
+
+	_, err = os.Stat(f.path)
+	assert.NotNil(t, err)
+}

virtcontainers/store/manager.go

@@ -173,6 +173,13 @@ func New(ctx context.Context, storeURL string) (*Store, error) {
 	return s, nil
 }
 
+// DeleteAll deletes all Stores from the manager.
+func DeleteAll() {
+	for _, s := range stores.stores {
+		s.Delete()
+	}
+}
+
 var storeLog = logrus.WithField("source", "virtcontainers/store")
 
 // Logger returns a logrus logger appropriate for logging Store messages
@@ -222,3 +229,22 @@ func (s *Store) Store(item Item, data interface{}) error {
 
 	return s.backend.store(item, data)
 }
+
+// Delete deletes all artifacts created by a Store.
+// The Store is also removed from the manager.
+func (s *Store) Delete() error {
+	span, _ := s.trace("Store")
+	defer span.Finish()
+
+	s.Lock()
+	defer s.Unlock()
+
+	if err := s.backend.delete(); err != nil {
+		return err
+	}
+
+	stores.removeStore(s.url)
+	s.url = ""
+
+	return nil
+}

virtcontainers/store/manager_test.go

@@ -22,6 +22,18 @@ func TestNewStore(t *testing.T) {
 	assert.Equal(t, s.path, "/tmp/root1/")
 }
 
+func TestDeleteStore(t *testing.T) {
+	s, err := New(context.Background(), storeRoot)
+	assert.Nil(t, err)
+
+	err = s.Delete()
+	assert.Nil(t, err)
+
+	// We should no longer find storeRoot
+	newStore := stores.findStore(storeRoot)
+	assert.Nil(t, newStore, "findStore should not have found %s", storeRoot)
+}
+
 func TestManagerAddStore(t *testing.T) {
 	s, err := New(context.Background(), storeRoot)
 	assert.Nil(t, err)