devmapper: add snapshotter

Signed-off-by: Maksym Pavlenko <makpav@amazon.com>

snapshots/devmapper/snapshotter_test.go

@@ -0,0 +1,78 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package devmapper
+
+import (
+	"context"
+	_ "crypto/sha256"
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/containerd/containerd/pkg/testutil"
+	"github.com/containerd/containerd/snapshots"
+	"github.com/containerd/containerd/snapshots/devmapper/dmsetup"
+	"github.com/containerd/containerd/snapshots/devmapper/losetup"
+	"github.com/containerd/containerd/snapshots/testsuite"
+	"github.com/sirupsen/logrus"
+	"gotest.tools/assert"
+)
+
+func TestSnapshotterSuite(t *testing.T) {
+	testutil.RequiresRoot(t)
+
+	logrus.SetLevel(logrus.DebugLevel)
+
+	testsuite.SnapshotterSuite(t, "devmapper", func(ctx context.Context, root string) (snapshots.Snapshotter, func() error, error) {
+		// Create loopback devices for each test case
+		_, loopDataDevice := createLoopbackDevice(t, root)
+		_, loopMetaDevice := createLoopbackDevice(t, root)
+
+		poolName := fmt.Sprintf("containerd-snapshotter-suite-pool-%d", time.Now().Nanosecond())
+		err := dmsetup.CreatePool(poolName, loopDataDevice, loopMetaDevice, 64*1024/dmsetup.SectorSize)
+		assert.NilError(t, err, "failed to create pool %q", poolName)
+
+		config := &Config{
+			RootPath:      root,
+			PoolName:      poolName,
+			BaseImageSize: "16Mb",
+		}
+
+		snap, err := NewSnapshotter(context.Background(), config)
+		if err != nil {
+			return nil, nil, err
+		}
+
+		// Remove device mapper pool after test completes
+		removePool := func() error {
+			return snap.pool.RemovePool(ctx)
+		}
+
+		// Pool cleanup should be called before closing metadata store (as we need to retrieve device names)
+		snap.cleanupFn = append([]closeFunc{removePool}, snap.cleanupFn...)
+
+		return snap, func() error {
+			err := snap.Close()
+			assert.NilError(t, err, "failed to close snapshotter")
+
+			err = losetup.DetachLoopDevice(loopDataDevice, loopMetaDevice)
+			assert.NilError(t, err, "failed to detach loop devices")
+
+			return err
+		}, nil
+	})
+}