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package layer // import "github.com/docker/docker/layer"
import (
"bytes"
"io"
"os"
"path/filepath"
"runtime"
"testing"
"github.com/docker/docker/daemon/graphdriver"
"github.com/docker/docker/pkg/stringid"
)
func tarFromFilesInGraph(graph graphdriver.Driver, graphID, parentID string, files ...FileApplier) ([]byte, error) {
t, err := tarFromFiles(files...)
if err != nil {
return nil, err
}
if err := graph.Create(graphID, parentID, nil); err != nil {
return nil, err
}
if _, err := graph.ApplyDiff(graphID, parentID, bytes.NewReader(t)); err != nil {
return nil, err
}
ar, err := graph.Diff(graphID, parentID)
if err != nil {
return nil, err
}
defer ar.Close()
return io.ReadAll(ar)
}
func TestLayerMigrationNoTarsplit(t *testing.T) {
// TODO Windows: Figure out why this is failing
if runtime.GOOS == "windows" {
t.Skip("Failing on Windows")
}
td, err := os.MkdirTemp("", "migration-test-")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(td)
layer1Files := []FileApplier{
newTestFile("/root/.bashrc", []byte("# Boring configuration"), 0o644),
newTestFile("/etc/profile", []byte("# Base configuration"), 0o644),
}
layer2Files := []FileApplier{
newTestFile("/root/.bashrc", []byte("# Updated configuration"), 0o644),
}
graph, err := newVFSGraphDriver(filepath.Join(td, "graphdriver-"))
if err != nil {
t.Fatal(err)
}
graphID1 := stringid.GenerateRandomID()
graphID2 := stringid.GenerateRandomID()
tar1, err := tarFromFilesInGraph(graph, graphID1, "", layer1Files...)
if err != nil {
t.Fatal(err)
}
tar2, err := tarFromFilesInGraph(graph, graphID2, graphID1, layer2Files...)
if err != nil {
t.Fatal(err)
}
root := filepath.Join(td, "layers")
ls, err := newStoreFromGraphDriver(root, graph)
if err != nil {
t.Fatal(err)
}
newTarDataPath := filepath.Join(td, ".migration-tardata")
diffID, size, err := ls.(*layerStore).ChecksumForGraphID(graphID1, "", newTarDataPath)
if err != nil {
t.Fatal(err)
}
layer1a, err := ls.(*layerStore).RegisterByGraphID(graphID1, "", diffID, newTarDataPath, size)
if err != nil {
t.Fatal(err)
}
layer1b, err := ls.Register(bytes.NewReader(tar1), "")
if err != nil {
t.Fatal(err)
}
assertReferences(t, layer1a, layer1b)
// Attempt register, should be same
layer2a, err := ls.Register(bytes.NewReader(tar2), layer1a.ChainID())
if err != nil {
t.Fatal(err)
}
diffID, size, err = ls.(*layerStore).ChecksumForGraphID(graphID2, graphID1, newTarDataPath)
if err != nil {
t.Fatal(err)
}
layer2b, err := ls.(*layerStore).RegisterByGraphID(graphID2, layer1a.ChainID(), diffID, newTarDataPath, size)
if err != nil {
t.Fatal(err)
}
assertReferences(t, layer2a, layer2b)
if metadata, err := ls.Release(layer2a); err != nil {
t.Fatal(err)
} else if len(metadata) > 0 {
t.Fatalf("Unexpected layer removal after first release: %#v", metadata)
}
metadata, err := ls.Release(layer2b)
if err != nil {
t.Fatal(err)
}
assertMetadata(t, metadata, createMetadata(layer2a))
}
|
