first commit

.vscode/settings.json

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+{
+    "go.formatTool": "goimports"
+}

Makefile

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+build:
+	GOOS=js GOARCH=wasm go build -o main.wasm

README.md

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+# dockerbot
+
+in development ...
+
+## Warn
+
+dockerbot/dockerfile2llb package is copied from moby/buildkit. but sygnal package is not used.

docker2dot/docker2dot.go

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+package docker2dot
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"strings"
+
+	"github.com/moby/buildkit/client/llb"
+	"github.com/moby/buildkit/solver/pb"
+	digest "github.com/opencontainers/go-digest"
+	"github.com/pkg/errors"
+	"github.com/po3rin/dockerdot/dockerfile2llb"
+)
+
+// Docker2Dot convert dockerfile to llb Expressed in DOT language.
+func Docker2Dot(df []byte) ([]byte, error) {
+	st, img, err := dockerfile2llb.Dockerfile2LLB(context.Background(), df, dockerfile2llb.ConvertOpt{})
+	if err != nil {
+		return nil, err
+	}
+
+	// ignore image
+	_ = img
+
+	def, err := st.Marshal()
+	if err != nil {
+		return nil, err
+	}
+
+	ops, err := loadLLB(def)
+	if err != nil {
+		return nil, err
+	}
+
+	var b bytes.Buffer
+	writeDot(ops, &b)
+	result := b.Bytes()
+
+	return result, nil
+}
+
+type llbOp struct {
+	Op         pb.Op
+	Digest     digest.Digest
+	OpMetadata pb.OpMetadata
+}
+
+// loadLLB load llbOp from llb.Definition.
+func loadLLB(def *llb.Definition) ([]llbOp, error) {
+	var ops []llbOp
+	for _, dt := range def.Def {
+		var op pb.Op
+		if err := (&op).Unmarshal(dt); err != nil {
+			return nil, errors.Wrap(err, "failed to parse op")
+		}
+		dgst := digest.FromBytes(dt)
+		ent := llbOp{Op: op, Digest: dgst, OpMetadata: def.Metadata[dgst]}
+		ops = append(ops, ent)
+	}
+	return ops, nil
+}
+
+func writeDot(ops []llbOp, w io.Writer) {
+	// TODO: print OpMetadata
+	fmt.Fprintln(w, "digraph {")
+	defer fmt.Fprintln(w, "}")
+	for _, op := range ops {
+		name, shape := attr(op.Digest, op.Op)
+		fmt.Fprintf(w, "  %q [label=%q shape=%q];\n", op.Digest, name, shape)
+	}
+	for _, op := range ops {
+		for i, inp := range op.Op.Inputs {
+			label := ""
+			if eo, ok := op.Op.Op.(*pb.Op_Exec); ok {
+				for _, m := range eo.Exec.Mounts {
+					if int(m.Input) == i && m.Dest != "/" {
+						label = m.Dest
+					}
+				}
+			}
+			fmt.Fprintf(w, "  %q -> %q [label=%q];\n", inp.Digest, op.Digest, label)
+		}
+	}
+}
+
+func attr(dgst digest.Digest, op pb.Op) (string, string) {
+	switch op := op.Op.(type) {
+	case *pb.Op_Source:
+		return op.Source.Identifier, "ellipse"
+	case *pb.Op_Exec:
+		return strings.Join(op.Exec.Meta.Args, " "), "box"
+	case *pb.Op_Build:
+		return "build", "box3d"
+	default:
+		return dgst.String(), "plaintext"
+	}
+}