containerd/snapshot/testsuite.go

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package snapshot
import (
"context"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"testing"
"github.com/docker/containerd"
"github.com/docker/containerd/testutil"
"github.com/stretchr/testify/assert"
)
// Create a New Layer on top of base layer with Prepare, Stat on new layer, should return Active layer.
func checkSnapshotterStatActive(t *testing.T, snapshotter Snapshotter, work string) {
ctx := context.TODO()
preparing := filepath.Join(work, "preparing")
if err := os.MkdirAll(preparing, 0777); err != nil {
t.Fatal(err)
}
mounts, err := snapshotter.Prepare(ctx, preparing, "")
if err != nil {
t.Fatal(err)
}
if len(mounts) < 1 {
t.Fatal("expected mounts to have entries")
}
if err = containerd.MountAll(mounts, preparing); err != nil {
t.Fatal(err)
}
defer testutil.Unmount(t, preparing)
if err = ioutil.WriteFile(filepath.Join(preparing, "foo"), []byte("foo\n"), 0777); err != nil {
t.Fatal(err)
}
si, err := snapshotter.Stat(ctx, preparing)
if err != nil {
t.Fatal(err)
}
assert.Equal(t, si.Name, preparing)
assert.Equal(t, KindActive, si.Kind)
assert.Equal(t, "", si.Parent)
}
// Commit a New Layer on top of base layer with Prepare & Commit , Stat on new layer, should return Committed layer.
func checkSnapshotterStatCommitted(t *testing.T, snapshotter Snapshotter, work string) {
ctx := context.TODO()
preparing := filepath.Join(work, "preparing")
if err := os.MkdirAll(preparing, 0777); err != nil {
t.Fatal(err)
}
mounts, err := snapshotter.Prepare(ctx, preparing, "")
if err != nil {
t.Fatal(err)
}
if len(mounts) < 1 {
t.Fatal("expected mounts to have entries")
}
if err = containerd.MountAll(mounts, preparing); err != nil {
t.Fatal(err)
}
defer testutil.Unmount(t, preparing)
if err = ioutil.WriteFile(filepath.Join(preparing, "foo"), []byte("foo\n"), 0777); err != nil {
t.Fatal(err)
}
committed := filepath.Join(work, "committed")
if err = snapshotter.Commit(ctx, committed, preparing); err != nil {
t.Fatal(err)
}
si, err := snapshotter.Stat(ctx, committed)
if err != nil {
t.Fatal(err)
}
assert.Equal(t, si.Name, committed)
assert.Equal(t, KindCommitted, si.Kind)
assert.Equal(t, "", si.Parent)
}
func snapshotterPrepareMount(ctx context.Context, snapshotter Snapshotter, diffPathName string, parent string, work string) (string, error) {
preparing := filepath.Join(work, diffPathName)
if err := os.MkdirAll(preparing, 0777); err != nil {
return "", err
}
mounts, err := snapshotter.Prepare(ctx, preparing, parent)
if err != nil {
return "", err
}
if len(mounts) < 1 {
return "", fmt.Errorf("expected mounts to have entries")
}
if err = containerd.MountAll(mounts, preparing); err != nil {
return "", err
}
return preparing, nil
}
// Given A <- B <- C, B is the parent of C and A is a transitive parent of C (in this case, a "grandparent")
func checkSnapshotterTransitivity(t *testing.T, snapshotter Snapshotter, work string) {
ctx := context.TODO()
preparing, err := snapshotterPrepareMount(ctx, snapshotter, "preparing", "", work)
if err != nil {
t.Fatal(err)
}
defer testutil.Unmount(t, preparing)
if err = ioutil.WriteFile(filepath.Join(preparing, "foo"), []byte("foo\n"), 0777); err != nil {
t.Fatal(err)
}
snapA := filepath.Join(work, "snapA")
if err = snapshotter.Commit(ctx, snapA, preparing); err != nil {
t.Fatal(err)
}
next, err := snapshotterPrepareMount(ctx, snapshotter, "next", snapA, work)
if err != nil {
t.Fatal(err)
}
defer testutil.Unmount(t, next)
if err = ioutil.WriteFile(filepath.Join(next, "foo"), []byte("foo bar\n"), 0777); err != nil {
t.Fatal(err)
}
snapB := filepath.Join(work, "snapB")
if err = snapshotter.Commit(ctx, snapB, next); err != nil {
t.Fatal(err)
}
siA, err := snapshotter.Stat(ctx, snapA)
if err != nil {
t.Fatal(err)
}
siB, err := snapshotter.Stat(ctx, snapB)
if err != nil {
t.Fatal(err)
}
siParentB, err := snapshotter.Stat(ctx, siB.Parent)
if err != nil {
t.Fatal(err)
}
// Test the transivity
assert.Equal(t, "", siA.Parent)
assert.Equal(t, snapA, siB.Parent)
assert.Equal(t, "", siParentB.Parent)
}