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helpers.go
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helpers.go
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package testsuite
import (
"context"
"fmt"
"io/ioutil"
"math/rand"
"os"
"github.com/containerd/containerd/fs/fstest"
"github.com/containerd/containerd/mount"
"github.com/containerd/containerd/snapshots"
"github.com/pkg/errors"
)
func applyToMounts(m []mount.Mount, work string, a fstest.Applier) (err error) {
td, err := ioutil.TempDir(work, "prepare")
if err != nil {
return errors.Wrap(err, "failed to create temp dir")
}
defer os.RemoveAll(td)
if err := mount.All(m, td); err != nil {
return errors.Wrap(err, "failed to mount")
}
defer func() {
if err1 := mount.UnmountAll(td, umountflags); err == nil {
err = errors.Wrap(err1, "failed to unmount")
}
}()
return a.Apply(td)
}
// createSnapshot creates a new snapshot in the snapshotter
// given an applier to run on top of the given parent.
func createSnapshot(ctx context.Context, sn snapshots.Snapshotter, parent, work string, a fstest.Applier) (string, error) {
n := fmt.Sprintf("%p-%d", a, rand.Int())
prepare := fmt.Sprintf("%s-prepare", n)
m, err := sn.Prepare(ctx, prepare, parent, opt)
if err != nil {
return "", errors.Wrap(err, "failed to prepare snapshot")
}
if err := applyToMounts(m, work, a); err != nil {
return "", errors.Wrap(err, "failed to apply")
}
if err := sn.Commit(ctx, n, prepare, opt); err != nil {
return "", errors.Wrap(err, "failed to commit")
}
return n, nil
}
func checkSnapshot(ctx context.Context, sn snapshots.Snapshotter, work, name, check string) (err error) {
td, err := ioutil.TempDir(work, "check")
if err != nil {
return errors.Wrap(err, "failed to create temp dir")
}
defer func() {
if err1 := os.RemoveAll(td); err == nil {
err = errors.Wrapf(err1, "failed to remove temporary directory %s", td)
}
}()
view := fmt.Sprintf("%s-view", name)
m, err := sn.View(ctx, view, name, opt)
if err != nil {
return errors.Wrap(err, "failed to create view")
}
defer func() {
if err1 := sn.Remove(ctx, view); err == nil {
err = errors.Wrap(err1, "failed to remove view")
}
}()
if err := mount.All(m, td); err != nil {
return errors.Wrap(err, "failed to mount")
}
defer func() {
if err1 := mount.UnmountAll(td, umountflags); err == nil {
err = errors.Wrap(err1, "failed to unmount view")
}
}()
if err := fstest.CheckDirectoryEqual(check, td); err != nil {
return errors.Wrap(err, "check directory failed")
}
return nil
}
// checkSnapshots creates a new chain of snapshots in the given snapshotter
// using the provided appliers, checking each snapshot created in a view
// against the changes applied to a single directory.
func checkSnapshots(ctx context.Context, sn snapshots.Snapshotter, work string, as ...fstest.Applier) error {
td, err := ioutil.TempDir(work, "flat")
if err != nil {
return errors.Wrap(err, "failed to create temp dir")
}
defer os.RemoveAll(td)
var parentID string
for i, a := range as {
s, err := createSnapshot(ctx, sn, parentID, work, a)
if err != nil {
return errors.Wrapf(err, "failed to create snapshot %d", i+1)
}
if err := a.Apply(td); err != nil {
return errors.Wrapf(err, "failed to apply to check directory on %d", i+1)
}
if err := checkSnapshot(ctx, sn, work, s, td); err != nil {
return errors.Wrapf(err, "snapshot check failed on snapshot %d", i+1)
}
parentID = s
}
return nil
}
// checkInfo checks that the infos are the same
func checkInfo(si1, si2 snapshots.Info) error {
if si1.Kind != si2.Kind {
return errors.Errorf("Expected kind %v, got %v", si1.Kind, si2.Kind)
}
if si1.Name != si2.Name {
return errors.Errorf("Expected name %v, got %v", si1.Name, si2.Name)
}
if si1.Parent != si2.Parent {
return errors.Errorf("Expected Parent %v, got %v", si1.Parent, si2.Parent)
}
if len(si1.Labels) != len(si2.Labels) {
return errors.Errorf("Expected %d labels, got %d", len(si1.Labels), len(si2.Labels))
}
for k, l1 := range si1.Labels {
l2 := si2.Labels[k]
if l1 != l2 {
return errors.Errorf("Expected label %v, got %v", l1, l2)
}
}
if si1.Created != si2.Created {
return errors.Errorf("Expected Created %v, got %v", si1.Created, si2.Created)
}
if si1.Updated != si2.Updated {
return errors.Errorf("Expected Updated %v, got %v", si1.Updated, si2.Updated)
}
return nil
}