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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"os/exec"
"strings"
"github.com/golang/protobuf/proto"
"github.com/golang/protobuf/protoc-gen-go/descriptor"
)
type descriptorSet struct {
merged descriptor.FileDescriptorSet
seen map[string]struct{}
ignoreFiles map[string]struct{}
descProto string
includeDir string
}
func newDescriptorSet(ignoreFiles []string, d string, i string) *descriptorSet {
ifm := make(map[string]struct{}, len(ignoreFiles))
for _, ignore := range ignoreFiles {
ifm[ignore] = struct{}{}
}
return &descriptorSet{
seen: make(map[string]struct{}),
ignoreFiles: ifm,
descProto: d,
includeDir: i,
}
}
func (d *descriptorSet) add(descs ...*descriptor.FileDescriptorProto) {
for _, file := range descs {
name := file.GetName()
if _, ok := d.seen[name]; ok {
continue
}
if _, ok := d.ignoreFiles[name]; ok {
continue
}
// TODO(stevvooe): If we want to filter certain fields in the descriptor,
// this is the place to do it. May be necessary if certain fields are
// noisy, such as option fields.
d.merged.File = append(d.merged.File, file)
d.seen[name] = struct{}{}
}
}
// stabilize outputs the merged protobuf descriptor set into the provided writer.
//
// This is equivalent to the following command:
//
// cat merged.pb | protoc -I /path/to --decode google.protobuf.FileDescriptorSet /path/to/google/protobuf/descriptor.proto
func (d *descriptorSet) marshalTo(w io.Writer) error {
p, err := proto.Marshal(&d.merged)
if err != nil {
return err
}
args := []string{
"protoc",
"-I",
d.includeDir,
"--decode",
"google.protobuf.FileDescriptorSet",
d.descProto,
}
cmd := exec.Command(args[0], args[1:]...)
cmd.Stdin = bytes.NewReader(p)
cmd.Stdout = w
cmd.Stderr = os.Stderr
if !quiet {
fmt.Println(strings.Join(args, " "))
}
return cmd.Run()
}
func readDesc(path string) (*descriptor.FileDescriptorSet, error) {
var desc descriptor.FileDescriptorSet
p, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
if err := proto.Unmarshal(p, &desc); err != nil {
log.Fatalln(err)
}
return &desc, nil
}
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