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image.go
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image.go
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package fakes
import (
"archive/tar"
"crypto/sha256"
"encoding/hex"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"strings"
"time"
registryName "github.com/google/go-containerregistry/pkg/name"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/pkg/errors"
"github.com/buildpacks/imgutil"
)
func NewImage(name, topLayerSha string, identifier imgutil.Identifier) *Image {
return &Image{
labels: nil,
env: map[string]string{},
topLayerSha: topLayerSha,
identifier: identifier,
name: name,
cmd: []string{"initialCMD"},
layersMap: map[string]string{},
prevLayersMap: map[string]string{},
createdAt: time.Now(),
savedNames: map[string]bool{},
os: "linux",
osVersion: "",
architecture: "amd64",
savedAnnotations: map[string]string{},
}
}
type Image struct {
deleted bool
layers []string
history []v1.History
layersMap map[string]string
prevLayersMap map[string]string
reusedLayers []string
labels map[string]string
env map[string]string
topLayerSha string
os string
osVersion string
architecture string
variant string
identifier imgutil.Identifier
name string
entryPoint []string
cmd []string
base string
createdAt time.Time
layerDir string
workingDir string
savedNames map[string]bool
manifestSize int64
refName string
savedAnnotations map[string]string
}
func (i *Image) CreatedAt() (time.Time, error) {
return i.createdAt, nil
}
func (i *Image) History() ([]v1.History, error) {
return i.history, nil
}
func (i *Image) Label(key string) (string, error) {
return i.labels[key], nil
}
func (i *Image) Labels() (map[string]string, error) {
copiedLabels := make(map[string]string)
for i, l := range i.labels {
copiedLabels[i] = l
}
return copiedLabels, nil
}
func (i *Image) OS() (string, error) {
return i.os, nil
}
func (i *Image) OSVersion() (string, error) {
return i.osVersion, nil
}
func (i *Image) Architecture() (string, error) {
return i.architecture, nil
}
func (i *Image) Variant() (string, error) {
return i.variant, nil
}
func (i *Image) Rename(name string) {
i.name = name
}
func (i *Image) Name() string {
return i.name
}
func (i *Image) Identifier() (imgutil.Identifier, error) {
return i.identifier, nil
}
func (i *Image) Rebase(baseTopLayer string, newBase imgutil.Image) error {
i.base = newBase.Name()
return nil
}
func (i *Image) SetLabel(k string, v string) error {
if i.labels == nil {
i.labels = map[string]string{}
}
i.labels[k] = v
return nil
}
func (i *Image) RemoveLabel(key string) error {
delete(i.labels, key)
return nil
}
func (i *Image) SetEnv(k string, v string) error {
i.env[k] = v
return nil
}
func (i *Image) SetHistory(history []v1.History) error {
i.history = history
return nil
}
func (i *Image) SetOS(o string) error {
i.os = o
return nil
}
func (i *Image) SetOSVersion(v string) error {
i.osVersion = v
return nil
}
func (i *Image) SetArchitecture(a string) error {
i.architecture = a
return nil
}
func (i *Image) SetVariant(a string) error {
i.variant = a
return nil
}
func (i *Image) SetWorkingDir(dir string) error {
i.workingDir = dir
return nil
}
func (i *Image) SetEntrypoint(v ...string) error {
i.entryPoint = v
return nil
}
func (i *Image) SetCmd(v ...string) error {
i.cmd = v
return nil
}
func (i *Image) SetCreatedAt(t time.Time) error {
i.createdAt = t
return nil
}
func (i *Image) Env(k string) (string, error) {
return i.env[k], nil
}
func (i *Image) TopLayer() (string, error) {
return i.topLayerSha, nil
}
func (i *Image) AddLayer(path string) error {
sha, err := shaForFile(path)
if err != nil {
return err
}
i.layersMap["sha256:"+sha] = path
i.layers = append(i.layers, path)
i.history = append(i.history, v1.History{})
return nil
}
func (i *Image) AddLayerWithDiffID(path string, diffID string) error {
i.layersMap[diffID] = path
i.layers = append(i.layers, path)
i.history = append(i.history, v1.History{})
return nil
}
func (i *Image) AddLayerWithDiffIDAndHistory(path, diffID string, history v1.History) error {
i.layersMap[diffID] = path
i.layers = append(i.layers, path)
i.history = append(i.history, history)
return nil
}
func shaForFile(path string) (string, error) {
rc, err := os.Open(filepath.Clean(path))
if err != nil {
return "", errors.Wrapf(err, "failed to open file")
}
defer rc.Close()
hasher := sha256.New()
if _, err := io.Copy(hasher, rc); err != nil {
return "", errors.Wrapf(err, "failed to copy rc to hasher")
}
return hex.EncodeToString(hasher.Sum(make([]byte, 0, hasher.Size()))), nil
}
func (i *Image) GetLayer(sha string) (io.ReadCloser, error) {
path, ok := i.layersMap[sha]
if !ok {
return nil, fmt.Errorf("failed to get layer with sha '%s'", sha)
}
return os.Open(filepath.Clean(path))
}
func (i *Image) ReuseLayer(sha string) error {
prevLayer, ok := i.prevLayersMap[sha]
if !ok {
return fmt.Errorf("image does not have previous layer with sha '%s'", sha)
}
i.reusedLayers = append(i.reusedLayers, sha)
i.layersMap[sha] = prevLayer
return nil
}
func (i *Image) ReuseLayerWithHistory(sha string, history v1.History) error {
if err := i.ReuseLayer(sha); err != nil {
return err
}
i.history = append(i.history, history)
return nil
}
func (i *Image) Save(additionalNames ...string) error {
return i.SaveAs(i.Name(), additionalNames...)
}
func (i *Image) SaveAs(name string, additionalNames ...string) error {
var err error
i.layerDir, err = ioutil.TempDir("", "fake-image")
if err != nil {
return err
}
for sha, path := range i.layersMap {
newPath := filepath.Join(i.layerDir, filepath.Base(path))
i.copyLayer(path, newPath) // errcheck ignore
i.layersMap[sha] = newPath
}
for l := range i.layers {
layerPath := i.layers[l]
i.layers[l] = filepath.Join(i.layerDir, filepath.Base(layerPath))
}
allNames := append([]string{name}, additionalNames...)
if i.refName != "" {
i.savedAnnotations["org.opencontainers.image.ref.name"] = i.refName
}
var errs []imgutil.SaveDiagnostic
for _, n := range allNames {
_, err := registryName.ParseReference(n, registryName.WeakValidation)
if err != nil {
errs = append(errs, imgutil.SaveDiagnostic{ImageName: n, Cause: err})
} else {
i.savedNames[n] = true
}
}
if len(errs) > 0 {
return imgutil.SaveError{Errors: errs}
}
return nil
}
func (i *Image) SaveFile() (string, error) {
return "", errors.New("not yet implemented")
}
func (i *Image) copyLayer(path, newPath string) error {
src, err := os.Open(filepath.Clean(path))
if err != nil {
return errors.Wrap(err, "opening layer during copy")
}
defer src.Close()
dst, err := os.Create(newPath)
if err != nil {
return errors.Wrap(err, "creating new layer during copy")
}
defer dst.Close()
if _, err := io.Copy(dst, src); err != nil {
return errors.Wrap(err, "copying layers")
}
return nil
}
func (i *Image) Delete() error {
i.deleted = true
return nil
}
func (i *Image) Found() bool {
return !i.deleted
}
func (i *Image) Valid() bool {
return !i.deleted
}
func (i *Image) AnnotateRefName(refName string) error {
i.refName = refName
return nil
}
func (i *Image) GetAnnotateRefName() (string, error) {
return i.refName, nil
}
// test methods
func (i *Image) SetIdentifier(identifier imgutil.Identifier) {
i.identifier = identifier
}
func (i *Image) Cleanup() error {
return os.RemoveAll(i.layerDir)
}
func (i *Image) AppLayerPath() string {
return i.layers[0]
}
func (i *Image) Entrypoint() ([]string, error) {
return i.entryPoint, nil
}
func (i *Image) Cmd() ([]string, error) {
return i.cmd, nil
}
func (i *Image) ConfigLayerPath() string {
return i.layers[1]
}
func (i *Image) ReusedLayers() []string {
return i.reusedLayers
}
func (i *Image) WorkingDir() (string, error) {
return i.workingDir, nil
}
func (i *Image) AddPreviousLayer(sha, path string) {
i.prevLayersMap[sha] = path
}
func (i *Image) FindLayerWithPath(path string) (string, error) {
// we iterate backwards over the layer array b/c later layers could replace a file with a given path
for idx := len(i.layers) - 1; idx >= 0; idx-- {
tarPath := i.layers[idx]
rc, err := os.Open(filepath.Clean(tarPath))
if err != nil {
return "", errors.Wrapf(err, "opening layer file '%s'", tarPath)
}
defer rc.Close()
tr := tar.NewReader(rc)
for {
header, err := tr.Next()
if err == io.EOF {
break
} else if err != nil {
return "", errors.Wrap(err, "finding next header in layer")
}
if header.Name == path {
return tarPath, nil
}
}
}
return "", fmt.Errorf("could not find '%s' in any layer.\n\n%s", path, i.tarContents())
}
func (i *Image) tarContents() string {
var strBuilder = &strings.Builder{}
strBuilder.WriteString("Layers\n-------\n")
for idx, tarPath := range i.layers {
i.writeLayerContents(strBuilder, tarPath)
if idx < len(i.layers)-1 {
strBuilder.WriteString("\n")
}
}
return strBuilder.String()
}
func (i *Image) writeLayerContents(strBuilder *strings.Builder, tarPath string) {
strBuilder.WriteString(fmt.Sprintf("%s\n", filepath.Base(tarPath)))
rc, err := os.Open(filepath.Clean(tarPath))
if err != nil {
strBuilder.WriteString(fmt.Sprintf("Error reading layer files: %s\n", err))
return
}
defer rc.Close()
tr := tar.NewReader(rc)
hasFiles := false
for {
header, err := tr.Next()
if err == io.EOF {
if !hasFiles {
strBuilder.WriteString(" (empty)\n")
}
break
}
var typ = "F"
var extra = ""
switch header.Typeflag {
case tar.TypeDir:
typ = "D"
case tar.TypeSymlink:
typ = "S"
extra = fmt.Sprintf(" -> %s", header.Linkname)
}
strBuilder.WriteString(fmt.Sprintf(" - [%s] %s%s\n", typ, header.Name, extra))
hasFiles = true
}
}
func (i *Image) NumberOfAddedLayers() int {
return len(i.layers)
}
func (i *Image) IsSaved() bool {
return len(i.savedNames) > 0
}
func (i *Image) Base() string {
return i.base
}
func (i *Image) SavedNames() []string {
var names []string
for k := range i.savedNames {
names = append(names, k)
}
return names
}
func (i *Image) SetManifestSize(size int64) {
i.manifestSize = size
}
func (i *Image) ManifestSize() (int64, error) {
return i.manifestSize, nil
}
func (i *Image) SavedAnnotations() map[string]string {
return i.savedAnnotations
}