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package layer // import "github.com/docker/docker/layer"
import (
"fmt"
"math/rand"
"os"
"path/filepath"
"strings"
"syscall"
"testing"
"github.com/docker/docker/pkg/stringid"
"github.com/opencontainers/go-digest"
)
func randomLayerID(seed int64) ChainID {
r := rand.New(rand.NewSource(seed))
return ChainID(digest.FromBytes([]byte(fmt.Sprintf("%d", r.Int63()))))
}
func newFileMetadataStore(t *testing.T) (*fileMetadataStore, string, func()) {
td, err := os.MkdirTemp("", "layers-")
if err != nil {
t.Fatal(err)
}
fms, err := newFSMetadataStore(td)
if err != nil {
t.Fatal(err)
}
return fms, td, func() {
if err := os.RemoveAll(td); err != nil {
t.Logf("Failed to cleanup %q: %s", td, err)
}
}
}
func assertNotDirectoryError(t *testing.T, err error) {
perr, ok := err.(*os.PathError)
if !ok {
t.Fatalf("Unexpected error %#v, expected path error", err)
}
if perr.Err != syscall.ENOTDIR {
t.Fatalf("Unexpected error %s, expected %s", perr.Err, syscall.ENOTDIR)
}
}
func TestCommitFailure(t *testing.T) {
fms, td, cleanup := newFileMetadataStore(t)
defer cleanup()
if err := os.WriteFile(filepath.Join(td, "sha256"), []byte("was here first!"), 0o644); err != nil {
t.Fatal(err)
}
tx, err := fms.StartTransaction()
if err != nil {
t.Fatal(err)
}
if err := tx.SetSize(0); err != nil {
t.Fatal(err)
}
err = tx.Commit(randomLayerID(5))
if err == nil {
t.Fatalf("Expected error committing with invalid layer parent directory")
}
assertNotDirectoryError(t, err)
}
func TestStartTransactionFailure(t *testing.T) {
fms, td, cleanup := newFileMetadataStore(t)
defer cleanup()
if err := os.WriteFile(filepath.Join(td, "tmp"), []byte("was here first!"), 0o644); err != nil {
t.Fatal(err)
}
_, err := fms.StartTransaction()
if err == nil {
t.Fatalf("Expected error starting transaction with invalid layer parent directory")
}
assertNotDirectoryError(t, err)
if err := os.Remove(filepath.Join(td, "tmp")); err != nil {
t.Fatal(err)
}
tx, err := fms.StartTransaction()
if err != nil {
t.Fatal(err)
}
if expected := filepath.Join(td, "tmp"); strings.HasPrefix(expected, tx.String()) {
t.Fatalf("Unexpected transaction string %q, expected prefix %q", tx.String(), expected)
}
if err := tx.Cancel(); err != nil {
t.Fatal(err)
}
}
func TestGetOrphan(t *testing.T) {
fms, td, cleanup := newFileMetadataStore(t)
defer cleanup()
layerRoot := filepath.Join(td, "sha256")
if err := os.MkdirAll(layerRoot, 0o755); err != nil {
t.Fatal(err)
}
tx, err := fms.StartTransaction()
if err != nil {
t.Fatal(err)
}
layerid := randomLayerID(5)
err = tx.Commit(layerid)
if err != nil {
t.Fatal(err)
}
layerPath := fms.getLayerDirectory(layerid)
if err := os.WriteFile(filepath.Join(layerPath, "cache-id"), []byte(stringid.GenerateRandomID()), 0o644); err != nil {
t.Fatal(err)
}
orphanLayers, err := fms.getOrphan()
if err != nil {
t.Fatal(err)
}
if len(orphanLayers) != 0 {
t.Fatalf("Expected to have zero orphan layers")
}
layeridSplit := strings.Split(layerid.String(), ":")
newPath := filepath.Join(layerRoot, fmt.Sprintf("%s-%s-removing", layeridSplit[1], stringid.GenerateRandomID()))
err = os.Rename(layerPath, newPath)
if err != nil {
t.Fatal(err)
}
orphanLayers, err = fms.getOrphan()
if err != nil {
t.Fatal(err)
}
if len(orphanLayers) != 1 {
t.Fatalf("Expected to have one orphan layer")
}
}
|
