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build: set record provenance in response
Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,198 @@ | ||
| package build | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "strings" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/cenkalti/backoff/v4" | ||
| "github.com/containerd/containerd/content/proxy" | ||
| "github.com/docker/buildx/util/confutil" | ||
| "github.com/docker/buildx/util/progress" | ||
| controlapi "github.com/moby/buildkit/api/services/control" | ||
| "github.com/moby/buildkit/client" | ||
| provenancetypes "github.com/moby/buildkit/solver/llbsolver/provenance/types" | ||
| "github.com/opencontainers/go-digest" | ||
| ocispecs "github.com/opencontainers/image-spec/specs-go/v1" | ||
| "github.com/pkg/errors" | ||
| "golang.org/x/sync/errgroup" | ||
| ) | ||
|
|
||
| func setRecordProvenance(ctx context.Context, c *client.Client, sr *client.SolveResponse, ref string, pw progress.Writer) error { | ||
| mode := confutil.MetadataProvenance() | ||
| if mode == confutil.MetadataProvenanceModeNone { | ||
| return nil | ||
| } | ||
| pw = progress.ResetTime(pw) | ||
| return progress.Wrap("resolve build record provenance", pw.Write, func(l progress.SubLogger) error { | ||
| bo := backoff.NewExponentialBackOff() | ||
| bo.MaxElapsedTime = 5 * time.Second | ||
| return backoff.Retry(func() error { | ||
| res, err := fetchProvenance(ctx, c, ref, mode, l) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| for k, v := range res { | ||
| sr.ExporterResponse[k] = v | ||
| } | ||
| return nil | ||
| }, bo) | ||
| }) | ||
| } | ||
|
|
||
| func fetchProvenance(ctx context.Context, c *client.Client, ref string, mode confutil.MetadataProvenanceMode, l progress.SubLogger) (out map[string]string, err error) { | ||
| cl, err := c.ControlClient().ListenBuildHistory(ctx, &controlapi.BuildHistoryRequest{ | ||
| Ref: ref, | ||
| EarlyExit: true, | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| var mu sync.Mutex | ||
| eg, ctx := errgroup.WithContext(ctx) | ||
| for { | ||
| ev, err := cl.Recv() | ||
| if errors.Is(err, io.EOF) { | ||
| break | ||
| } else if err != nil { | ||
| return nil, err | ||
| } | ||
| if ev.Record == nil { | ||
| continue | ||
| } | ||
| if ev.Record.Result != nil { | ||
| provenanceDgst := provenanceDigest(ev.Record.Result) | ||
| if provenanceDgst == nil { | ||
| continue | ||
| } | ||
| eg.Go(func() error { | ||
| dt, err := getBlob(ctx, c, *provenanceDgst, "", l) | ||
| if err != nil { | ||
| return errors.Wrapf(err, "failed to load provenance from build record") | ||
| } | ||
| prv, err := encodeProvenance(dt, mode) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| mu.Lock() | ||
| if out == nil { | ||
| out = make(map[string]string) | ||
| } | ||
| out["buildx.build.provenance"] = prv | ||
| mu.Unlock() | ||
| return nil | ||
| }) | ||
| } else if ev.Record.Results != nil { | ||
| for platform, res := range ev.Record.Results { | ||
| platform := platform | ||
| provenanceDgst := provenanceDigest(res) | ||
| if provenanceDgst == nil { | ||
| continue | ||
| } | ||
| eg.Go(func() error { | ||
| dt, err := getBlob(ctx, c, *provenanceDgst, platform, l) | ||
| if err != nil { | ||
| return errors.Wrapf(err, "failed to load provenance from build record") | ||
| } | ||
| prv, err := encodeProvenance(dt, mode) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| mu.Lock() | ||
| if out == nil { | ||
| out = make(map[string]string) | ||
| } | ||
| out["buildx.build.provenance/"+platform] = prv | ||
| mu.Unlock() | ||
| return nil | ||
| }) | ||
| } | ||
| } | ||
| } | ||
| return out, eg.Wait() | ||
| } | ||
|
|
||
| func provenanceDigest(res *controlapi.BuildResultInfo) *digest.Digest { | ||
| for _, a := range res.Attestations { | ||
| if a.MediaType == "application/vnd.in-toto+json" && strings.HasPrefix(a.Annotations["in-toto.io/predicate-type"], "https://slsa.dev/provenance/") { | ||
| return &a.Digest | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func encodeProvenance(dt []byte, mode confutil.MetadataProvenanceMode) (string, error) { | ||
| if mode == confutil.MetadataProvenanceModeMax { | ||
| return base64.StdEncoding.EncodeToString(dt), nil | ||
| } | ||
|
|
||
| var prv provenancetypes.ProvenancePredicate | ||
| if err := json.Unmarshal(dt, &prv); err != nil { | ||
| return "", errors.Wrapf(err, "failed to unmarshal provenance") | ||
| } | ||
|
|
||
| // remove buildConfig and metadata for minimal provenance | ||
| prv.BuildConfig = nil | ||
| prv.Metadata = nil | ||
|
|
||
| dtmin, err := json.Marshal(prv) | ||
| if err != nil { | ||
| return "", errors.Wrapf(err, "failed to marshal minimal provenance") | ||
| } | ||
|
|
||
| return base64.StdEncoding.EncodeToString(dtmin), nil | ||
| } | ||
|
|
||
| func getBlob(ctx context.Context, c *client.Client, dgst digest.Digest, platform string, l progress.SubLogger) (dt []byte, err error) { | ||
| id := "fetching " + dgst.String() | ||
| if platform != "" { | ||
| id = fmt.Sprintf("[%s] fetching %s", platform, dgst.String()) | ||
| } | ||
| st := &client.VertexStatus{ | ||
| ID: id, | ||
| } | ||
|
|
||
| defer func() { | ||
| now := time.Now() | ||
| st.Completed = &now | ||
| if err == nil { | ||
| st.Total = st.Current | ||
| } | ||
| l.SetStatus(st) | ||
| }() | ||
|
|
||
| now := time.Now() | ||
| st.Started = &now | ||
| l.SetStatus(st) | ||
|
|
||
| store := proxy.NewContentStore(c.ContentClient()) | ||
| ra, err := store.ReaderAt(ctx, ocispecs.Descriptor{ | ||
| Digest: dgst, | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer ra.Close() | ||
|
|
||
| for { | ||
| buf := make([]byte, 1024) | ||
| n, err := ra.ReadAt(buf, st.Current) | ||
| if err != nil && err != io.EOF { | ||
| return nil, err | ||
| } | ||
| dt = append(dt, buf[:n]...) | ||
| st.Current += int64(n) | ||
| l.SetStatus(st) | ||
| if err == io.EOF { | ||
| break | ||
| } | ||
| } | ||
|
|
||
| return dt, nil | ||
| } |
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