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dumpllb.go
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dumpllb.go
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package debug
import (
"encoding/json"
"fmt"
"io"
"os"
"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/urfave/cli"
)
var DumpLLBCommand = cli.Command{
Name: "dump-llb",
Usage: "dump LLB in human-readable format. LLB can be also passed via stdin. This command does not require the daemon to be running.",
ArgsUsage: "<llbfile>",
Action: dumpLLB,
Flags: []cli.Flag{
cli.BoolFlag{
Name: "dot",
Usage: "Output dot format",
},
},
}
func dumpLLB(clicontext *cli.Context) error {
var r io.Reader
if llbFile := clicontext.Args().First(); llbFile != "" && llbFile != "-" {
f, err := os.Open(llbFile)
if err != nil {
return err
}
defer f.Close()
r = f
} else {
r = os.Stdin
}
ops, err := loadLLB(r)
if err != nil {
return err
}
if clicontext.Bool("dot") {
writeDot(ops, os.Stdout)
} else {
enc := json.NewEncoder(os.Stdout)
for _, op := range ops {
if err := enc.Encode(op); err != nil {
return err
}
}
}
return nil
}
type llbOp struct {
Op pb.Op
Digest digest.Digest
OpMetadata pb.OpMetadata
}
func loadLLB(r io.Reader) ([]llbOp, error) {
def, err := llb.ReadFrom(r)
if err != nil {
return nil, err
}
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"
case *pb.Op_File:
names := []string{}
for _, action := range op.File.Actions {
var name string
switch act := action.Action.(type) {
case *pb.FileAction_Copy:
name = fmt.Sprintf("copy{src=%s, dest=%s}", act.Copy.Src, act.Copy.Dest)
case *pb.FileAction_Mkfile:
name = fmt.Sprintf("mkfile{path=%s}", act.Mkfile.Path)
case *pb.FileAction_Mkdir:
name = fmt.Sprintf("mkdir{path=%s}", act.Mkdir.Path)
case *pb.FileAction_Rm:
name = fmt.Sprintf("rm{path=%s}", act.Rm.Path)
}
names = append(names, name)
}
return strings.Join(names, ","), "note"
default:
return dgst.String(), "plaintext"
}
}