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writer.go
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writer.go
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package mobyexporter
import (
"context"
"encoding/json"
"time"
"github.com/containerd/containerd/platforms"
"github.com/moby/buildkit/cache"
"github.com/moby/buildkit/util/progress"
"github.com/moby/buildkit/util/system"
"github.com/opencontainers/go-digest"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
func emptyImageConfig() ([]byte, error) {
pl := platforms.Normalize(platforms.DefaultSpec())
img := ocispec.Image{}
img.Architecture = pl.Architecture
img.OS = pl.OS
img.Variant = pl.Variant
img.RootFS.Type = "layers"
img.Config.WorkingDir = "/"
img.Config.Env = []string{"PATH=" + system.DefaultPathEnv(pl.OS)}
dt, err := json.Marshal(img)
return dt, errors.Wrap(err, "failed to create empty image config")
}
func parseHistoryFromConfig(dt []byte) ([]ocispec.History, error) {
var config struct {
History []ocispec.History
}
if err := json.Unmarshal(dt, &config); err != nil {
return nil, errors.Wrap(err, "failed to unmarshal history from config")
}
return config.History, nil
}
func patchImageConfig(dt []byte, dps []digest.Digest, history []ocispec.History, cache []byte) ([]byte, error) {
m := map[string]json.RawMessage{}
if err := json.Unmarshal(dt, &m); err != nil {
return nil, errors.Wrap(err, "failed to parse image config for patch")
}
var rootFS ocispec.RootFS
rootFS.Type = "layers"
rootFS.DiffIDs = append(rootFS.DiffIDs, dps...)
dt, err := json.Marshal(rootFS)
if err != nil {
return nil, errors.Wrap(err, "failed to marshal rootfs")
}
m["rootfs"] = dt
dt, err = json.Marshal(history)
if err != nil {
return nil, errors.Wrap(err, "failed to marshal history")
}
m["history"] = dt
if _, ok := m["created"]; !ok {
var tm *time.Time
for _, h := range history {
if h.Created != nil {
tm = h.Created
}
}
dt, err = json.Marshal(&tm)
if err != nil {
return nil, errors.Wrap(err, "failed to marshal creation time")
}
m["created"] = dt
}
if cache != nil {
dt, err := json.Marshal(cache)
if err != nil {
return nil, err
}
m["moby.buildkit.cache.v0"] = dt
}
dt, err = json.Marshal(m)
return dt, errors.Wrap(err, "failed to marshal config after patch")
}
func normalizeLayersAndHistory(diffs []digest.Digest, history []ocispec.History, ref cache.ImmutableRef) ([]digest.Digest, []ocispec.History) {
refMeta := getRefMetadata(ref, len(diffs))
var historyLayers int
for _, h := range history {
if !h.EmptyLayer {
historyLayers++
}
}
if historyLayers > len(diffs) {
// this case shouldn't happen but if it does force set history layers empty
// from the bottom
logrus.Warn("invalid image config with unaccounted layers")
historyCopy := make([]ocispec.History, 0, len(history))
var l int
for _, h := range history {
if l >= len(diffs) {
h.EmptyLayer = true
}
if !h.EmptyLayer {
l++
}
historyCopy = append(historyCopy, h)
}
history = historyCopy
}
if len(diffs) > historyLayers {
// some history items are missing. add them based on the ref metadata
for _, md := range refMeta[historyLayers:] {
history = append(history, ocispec.History{
Created: md.createdAt,
CreatedBy: md.description,
Comment: "buildkit.exporter.image.v0",
})
}
}
var layerIndex int
for i, h := range history {
if !h.EmptyLayer {
if h.Created == nil {
h.Created = refMeta[layerIndex].createdAt
}
layerIndex++
}
history[i] = h
}
// Find the first new layer time. Otherwise, the history item for a first
// metadata command would be the creation time of a base image layer.
// If there is no such then the last layer with timestamp.
var created *time.Time
var noCreatedTime bool
for _, h := range history {
if h.Created != nil {
created = h.Created
if noCreatedTime {
break
}
} else {
noCreatedTime = true
}
}
// Fill in created times for all history items to be either the first new
// layer time or the previous layer.
noCreatedTime = false
for i, h := range history {
if h.Created != nil {
if noCreatedTime {
created = h.Created
}
} else {
noCreatedTime = true
h.Created = created
}
history[i] = h
}
return diffs, history
}
type refMetadata struct {
description string
createdAt *time.Time
}
func getRefMetadata(ref cache.ImmutableRef, limit int) []refMetadata {
if ref == nil {
return make([]refMetadata, limit)
}
layerChain := ref.LayerChain()
defer layerChain.Release(context.TODO())
if limit < len(layerChain) {
layerChain = layerChain[len(layerChain)-limit:]
}
metas := make([]refMetadata, len(layerChain))
for i, layer := range layerChain {
meta := &metas[i]
if description := layer.GetDescription(); description != "" {
meta.description = description
} else {
meta.description = "created by buildkit" // shouldn't be shown but don't fail build
}
createdAt := layer.GetCreatedAt()
meta.createdAt = &createdAt
}
return metas
}
func oneOffProgress(ctx context.Context, id string) func(err error) error {
pw, _, _ := progress.NewFromContext(ctx)
now := time.Now()
st := progress.Status{
Started: &now,
}
_ = pw.Write(id, st)
return func(err error) error {
// TODO: set error on status
now := time.Now()
st.Completed = &now
_ = pw.Write(id, st)
_ = pw.Close()
return err
}
}