143 lines
4.2 KiB
Go
143 lines
4.2 KiB
Go
// +build linux
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/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package devmapper
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import (
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"context"
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_ "crypto/sha256"
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"fmt"
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"io/ioutil"
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"os"
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"testing"
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"time"
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"github.com/containerd/continuity/fs/fstest"
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"github.com/hashicorp/go-multierror"
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"github.com/sirupsen/logrus"
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"gotest.tools/assert"
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"github.com/containerd/containerd/mount"
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"github.com/containerd/containerd/namespaces"
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"github.com/containerd/containerd/pkg/testutil"
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"github.com/containerd/containerd/snapshots"
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"github.com/containerd/containerd/snapshots/devmapper/dmsetup"
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"github.com/containerd/containerd/snapshots/devmapper/losetup"
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"github.com/containerd/containerd/snapshots/testsuite"
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)
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func TestSnapshotterSuite(t *testing.T) {
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testutil.RequiresRoot(t)
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logrus.SetLevel(logrus.DebugLevel)
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snapshotterFn := func(ctx context.Context, root string) (snapshots.Snapshotter, func() error, error) {
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// Create loopback devices for each test case
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_, loopDataDevice := createLoopbackDevice(t, root)
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_, loopMetaDevice := createLoopbackDevice(t, root)
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poolName := fmt.Sprintf("containerd-snapshotter-suite-pool-%d", time.Now().Nanosecond())
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err := dmsetup.CreatePool(poolName, loopDataDevice, loopMetaDevice, 64*1024/dmsetup.SectorSize)
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assert.NilError(t, err, "failed to create pool %q", poolName)
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config := &Config{
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RootPath: root,
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PoolName: poolName,
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BaseImageSize: "16Mb",
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}
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snap, err := NewSnapshotter(context.Background(), config)
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if err != nil {
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return nil, nil, err
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}
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// Remove device mapper pool and detach loop devices after test completes
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removePool := func() error {
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result := multierror.Append(
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snap.pool.RemovePool(ctx),
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losetup.DetachLoopDevice(loopDataDevice, loopMetaDevice))
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return result.ErrorOrNil()
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}
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// Pool cleanup should be called before closing metadata store (as we need to retrieve device names)
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snap.cleanupFn = append([]closeFunc{removePool}, snap.cleanupFn...)
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return snap, snap.Close, nil
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}
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testsuite.SnapshotterSuite(t, "devmapper", snapshotterFn)
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ctx := context.Background()
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ctx = namespaces.WithNamespace(ctx, "testsuite")
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t.Run("DevMapperUsage", func(t *testing.T) {
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tempDir, err := ioutil.TempDir("", "snapshot-suite-usage")
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assert.NilError(t, err)
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defer os.RemoveAll(tempDir)
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snapshotter, closer, err := snapshotterFn(ctx, tempDir)
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assert.NilError(t, err)
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defer closer()
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testUsage(t, snapshotter)
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})
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}
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// testUsage tests devmapper's Usage implementation. This is an approximate test as it's hard to
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// predict how many blocks will be consumed under different conditions and parameters.
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func testUsage(t *testing.T, snapshotter snapshots.Snapshotter) {
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ctx := context.Background()
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// Create empty base layer
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_, err := snapshotter.Prepare(ctx, "prepare-1", "")
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assert.NilError(t, err)
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emptyLayerUsage, err := snapshotter.Usage(ctx, "prepare-1")
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assert.NilError(t, err)
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// Should be > 0 as just written file system also consumes blocks
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assert.Assert(t, emptyLayerUsage.Size > 0)
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err = snapshotter.Commit(ctx, "layer-1", "prepare-1")
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assert.NilError(t, err)
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// Create child layer with 1MB file
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var (
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sizeBytes int64 = 1048576 // 1MB
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baseApplier = fstest.Apply(fstest.CreateRandomFile("/a", 12345679, sizeBytes, 0777))
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)
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mounts, err := snapshotter.Prepare(ctx, "prepare-2", "layer-1")
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assert.NilError(t, err)
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err = mount.WithTempMount(ctx, mounts, baseApplier.Apply)
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assert.NilError(t, err)
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err = snapshotter.Commit(ctx, "layer-2", "prepare-2")
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assert.NilError(t, err)
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layer2Usage, err := snapshotter.Usage(ctx, "layer-2")
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assert.NilError(t, err)
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// Should be at least 1 MB + fs metadata
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assert.Assert(t, layer2Usage.Size > sizeBytes)
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assert.Assert(t, layer2Usage.Size < sizeBytes+256*dmsetup.SectorSize)
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}
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