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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 +1,104 @@ | ||
| package build | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "encoding/base64" | ||
| "io" | ||
| "strings" | ||
| "sync" | ||
|
|
||
| "github.com/containerd/containerd/content" | ||
| "github.com/containerd/containerd/content/proxy" | ||
| "github.com/docker/buildx/util/progress" | ||
| controlapi "github.com/moby/buildkit/api/services/control" | ||
| "github.com/moby/buildkit/client" | ||
| "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 { | ||
| var mu sync.Mutex | ||
| pw = progress.ResetTime(pw) | ||
| return progress.Wrap("fetching build record provenance", pw.Write, func(l progress.SubLogger) error { | ||
| cl, err := c.ControlClient().ListenBuildHistory(ctx, &controlapi.BuildHistoryRequest{ | ||
| Ref: ref, | ||
| EarlyExit: true, | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| eg, ctx := errgroup.WithContext(ctx) | ||
| for { | ||
| ev, err := cl.Recv() | ||
| if errors.Is(err, io.EOF) { | ||
| break | ||
| } else if err != nil { | ||
| return err | ||
| } | ||
| if ev.Record == nil { | ||
| continue | ||
| } | ||
| if ev.Record.Result != nil { | ||
| provenanceDgst := provenanceDigest(ev.Record.Result) | ||
| if provenanceDgst == nil { | ||
| continue | ||
| } | ||
| eg.Go(func() error { | ||
| buf := &bytes.Buffer{} | ||
| if err := writeBlob(ctx, c, *provenanceDgst, buf); err != nil { | ||
| return errors.Wrapf(err, "failed to load provenance from build record") | ||
| } | ||
| mu.Lock() | ||
| sr.ExporterResponse["buildx.build.provenance"] = base64.StdEncoding.EncodeToString(buf.Bytes()) | ||
| 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 { | ||
| buf := &bytes.Buffer{} | ||
| if err := writeBlob(ctx, c, *provenanceDgst, buf); err != nil { | ||
| return errors.Wrapf(err, "failed to load provenance from build record") | ||
| } | ||
| mu.Lock() | ||
| sr.ExporterResponse["buildx.build.provenance/"+platform] = base64.StdEncoding.EncodeToString(buf.Bytes()) | ||
| mu.Unlock() | ||
| return nil | ||
| }) | ||
| } | ||
| } | ||
| } | ||
| return 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 writeBlob(ctx context.Context, c *client.Client, dgst digest.Digest, w io.Writer) error { | ||
| store := proxy.NewContentStore(c.ContentClient()) | ||
| ra, err := store.ReaderAt(ctx, ocispecs.Descriptor{ | ||
| Digest: dgst, | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer ra.Close() | ||
| _, err = io.Copy(w, content.NewReader(ra)) | ||
| return err | ||
| } |
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