mirror of
https://github.com/genuinetools/reg.git
synced 2024-09-12 06:11:03 -04:00
177 lines
4.3 KiB
Go
177 lines
4.3 KiB
Go
package containerimage
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import (
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"context"
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"encoding/json"
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"runtime"
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"time"
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"github.com/moby/buildkit/cache"
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"github.com/moby/buildkit/util/progress"
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"github.com/moby/buildkit/util/system"
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digest "github.com/opencontainers/go-digest"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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)
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// const (
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// emptyGZLayer = digest.Digest("sha256:4f4fb700ef54461cfa02571ae0db9a0dc1e0cdb5577484a6d75e68dc38e8acc1")
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// )
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func emptyImageConfig() ([]byte, error) {
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img := ocispec.Image{
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Architecture: runtime.GOARCH,
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OS: runtime.GOOS,
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}
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img.RootFS.Type = "layers"
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img.Config.WorkingDir = "/"
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img.Config.Env = []string{"PATH=" + system.DefaultPathEnv}
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dt, err := json.Marshal(img)
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return dt, errors.Wrap(err, "failed to create empty image config")
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}
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func parseHistoryFromConfig(dt []byte) ([]ocispec.History, error) {
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var config struct {
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History []ocispec.History
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}
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if err := json.Unmarshal(dt, &config); err != nil {
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return nil, errors.Wrap(err, "failed to unmarshal history from config")
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}
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return config.History, nil
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}
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func patchImageConfig(dt []byte, dps []digest.Digest, history []ocispec.History) ([]byte, error) {
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m := map[string]json.RawMessage{}
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if err := json.Unmarshal(dt, &m); err != nil {
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return nil, errors.Wrap(err, "failed to parse image config for patch")
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}
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var rootFS ocispec.RootFS
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rootFS.Type = "layers"
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rootFS.DiffIDs = append(rootFS.DiffIDs, dps...)
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dt, err := json.Marshal(rootFS)
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if err != nil {
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return nil, errors.Wrap(err, "failed to marshal rootfs")
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}
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m["rootfs"] = dt
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dt, err = json.Marshal(history)
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if err != nil {
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return nil, errors.Wrap(err, "failed to marshal history")
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}
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m["history"] = dt
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if _, ok := m["created"]; !ok {
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var tm *time.Time
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for _, h := range history {
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if h.Created != nil {
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tm = h.Created
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}
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}
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dt, err = json.Marshal(&tm)
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if err != nil {
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return nil, errors.Wrap(err, "failed to marshal creation time")
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}
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m["created"] = dt
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}
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dt, err = json.Marshal(m)
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return dt, errors.Wrap(err, "failed to marshal config after patch")
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}
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func normalizeLayersAndHistory(diffs []digest.Digest, history []ocispec.History, ref cache.ImmutableRef) ([]digest.Digest, []ocispec.History) {
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refMeta := getRefMetadata(ref, len(diffs))
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var historyLayers int
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for _, h := range history {
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if !h.EmptyLayer {
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historyLayers++
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}
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}
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if historyLayers > len(diffs) {
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// this case shouldn't happen but if it does force set history layers empty
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// from the bottom
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logrus.Warn("invalid image config with unaccounted layers")
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historyCopy := make([]ocispec.History, 0, len(history))
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var l int
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for _, h := range history {
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if l >= len(diffs) {
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h.EmptyLayer = true
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}
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if !h.EmptyLayer {
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l++
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}
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historyCopy = append(historyCopy, h)
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}
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history = historyCopy
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}
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if len(diffs) > historyLayers {
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// some history items are missing. add them based on the ref metadata
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for _, md := range refMeta[historyLayers:] {
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history = append(history, ocispec.History{
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Created: &md.createdAt,
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CreatedBy: md.description,
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Comment: "buildkit.exporter.image.v0",
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})
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}
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}
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var layerIndex int
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for i, h := range history {
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if !h.EmptyLayer {
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if h.Created == nil {
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h.Created = &refMeta[layerIndex].createdAt
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}
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layerIndex++
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}
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history[i] = h
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}
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return diffs, history
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}
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type refMetadata struct {
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description string
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createdAt time.Time
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}
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func getRefMetadata(ref cache.ImmutableRef, limit int) []refMetadata {
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if limit <= 0 {
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return nil
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}
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meta := refMetadata{
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description: "created by buildkit", // shouldn't be shown but don't fail build
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createdAt: time.Now(),
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}
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if ref == nil {
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return append(getRefMetadata(nil, limit-1), meta)
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}
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if descr := cache.GetDescription(ref.Metadata()); descr != "" {
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meta.description = descr
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}
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meta.createdAt = cache.GetCreatedAt(ref.Metadata())
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p := ref.Parent()
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if p != nil {
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defer p.Release(context.TODO())
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}
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return append(getRefMetadata(p, limit-1), meta)
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}
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func oneOffProgress(ctx context.Context, id string) func(err error) error {
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pw, _, _ := progress.FromContext(ctx)
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now := time.Now()
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st := progress.Status{
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Started: &now,
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}
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pw.Write(id, st)
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return func(err error) error {
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// TODO: set error on status
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now := time.Now()
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st.Completed = &now
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pw.Write(id, st)
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pw.Close()
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return err
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}
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}
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