containerd/cmd/ctrd-protobuild/main.go

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package main
import (
"bytes"
"flag"
"fmt"
"log"
"os"
"os/exec"
"path/filepath"
"strings"
"text/template"
)
// defines several variables for parameterizing the protoc command. We can pull
// this out into a toml files in cases where we to vary this per package.
var (
generationPlugin = "gogoctrd"
preIncludePaths = []string{
".",
}
// vendoredIncludes is used for packages that should be included as vendor
// directories. We don't differentiate between packages and projects here.
// This should just be the root of where the protos are included from.
vendoredIncludes = []string{
"github.com/gogo/protobuf",
}
// postIncludePaths defines untouched include paths to be added untouched
// to the protoc command.
postIncludePaths = []string{
"/usr/local/include", // common location for protoc installation of WKTs
}
plugins = []string{
"grpc",
}
// packageMap allows us to map protofile imports to specific Go packages. These
// becomes the M declarations at the end of the declaration.
packageMap = map[string]string{
"google/protobuf/timestamp.proto": "github.com/gogo/protobuf/types",
"google/protobuf/descriptor.proto": "github.com/gogo/protobuf/protoc-gen-gogo/descriptor",
"gogoproto/gogo.proto": "github.com/gogo/protobuf/gogoproto",
}
tmpl = template.Must(template.New("protoc").Parse(`protoc -I
{{- range $index, $include := .Includes -}}
{{if $index}}:{{end -}}
{{.}}
{{- end }} --
{{- .Name -}}_out=plugins={{- range $index, $plugin := .Plugins -}}
{{- if $index}}+{{end}}
{{- $plugin}}
{{- end -}}
,import_path={{.ImportPath}}
{{- range $proto, $gopkg := .PackageMap -}},M
{{- $proto}}={{$gopkg -}}
{{- end -}}
:{{- .OutputDir }}
{{- range .Files}} {{.}}{{end -}}
`))
)
// Protoc defines inputs to a protoc command string.
type Protoc struct {
Name string // backend name
Includes []string
Plugins []string
ImportPath string
PackageMap map[string]string
Files []string
OutputDir string
}
func (p *Protoc) mkcmd() (string, error) {
var buf bytes.Buffer
if err := tmpl.Execute(&buf, p); err != nil {
return "", err
}
return buf.String(), nil
}
func main() {
flag.Parse()
pkgInfos, err := goPkgInfo(flag.Args()...)
if err != nil {
log.Fatalln(err)
}
gopath, err := gopathSrc()
if err != nil {
log.Fatalln(err)
}
gopathCurrent, err := gopathCurrent()
if err != nil {
log.Fatalln(err)
}
// For some reason, the golang protobuf generator makes the god awful
// decision to output the files relative to the gopath root. It doesn't do
// this only in the case where you give it ".".
outputDir := filepath.Join(gopathCurrent, "src")
for _, pkg := range pkgInfos {
var includes []string
includes = append(includes, preIncludePaths...)
vendor, err := closestVendorDir(pkg.Dir)
if err != nil {
log.Fatalln(err)
}
// we also special case the inclusion of gogoproto in the vendor dir.
// We could parameterize this better if we find it to be a common case.
var vendoredIncludesResolved []string
for _, vendoredInclude := range vendoredIncludes {
vendoredIncludesResolved = append(vendoredIncludesResolved,
filepath.Join(vendor, vendoredInclude))
}
includes = append(includes, vendoredIncludesResolved...)
includes = append(includes, vendor, gopath)
includes = append(includes, postIncludePaths...)
protoc := Protoc{
Name: generationPlugin,
ImportPath: pkg.GoImportPath,
PackageMap: packageMap,
Plugins: plugins,
Files: pkg.ProtoFiles,
OutputDir: outputDir,
Includes: includes,
}
arg, err := protoc.mkcmd()
if err != nil {
log.Fatalln(err)
}
fmt.Println(arg)
// pass to sh -c so we don't need to re-split here.
args := []string{"-c", arg}
cmd := exec.Command("sh", args...)
if err := cmd.Run(); err != nil {
log.Fatalln(err)
}
}
}
type protoGoPkgInfo struct {
Dir string
GoImportPath string
ProtoFiles []string
}
func goPkgInfo(golistpath ...string) ([]protoGoPkgInfo, error) {
args := []string{
"list", "-e", "-f", "{{.ImportPath}} {{.Dir}}"}
args = append(args, golistpath...)
cmd := exec.Command("go", args...)
p, err := cmd.Output()
if err != nil {
return nil, err
}
var pkgInfos []protoGoPkgInfo
lines := bytes.Split(p, []byte("\n"))
for _, line := range lines {
if len(line) == 0 {
continue
}
parts := bytes.Fields(line)
if len(parts) != 2 {
return nil, fmt.Errorf("bad output from command: %s", p)
}
pkgInfo := protoGoPkgInfo{
Dir: string(parts[1]),
GoImportPath: string(parts[0]),
}
protoFiles, err := filepath.Glob(filepath.Join(pkgInfo.Dir, "*.proto"))
if err != nil {
return nil, err
}
if len(protoFiles) == 0 {
continue // not a proto directory, skip
}
pkgInfo.ProtoFiles = protoFiles
pkgInfos = append(pkgInfos, pkgInfo)
}
return pkgInfos, nil
}
// gopathSrc modifies GOPATH elements from env to include the src directory.
func gopathSrc() (string, error) {
gopathAll := os.Getenv("GOPATH")
if gopathAll == "" {
return "", fmt.Errorf("must be run from a gopath")
}
var elements []string
for _, element := range strings.Split(gopathAll, ":") { // TODO(stevvooe): Make this work on windows.
elements = append(elements, filepath.Join(element, "src"))
}
return strings.Join(elements, ":"), nil
}
// gopathCurrent provides the top-level gopath for the current generation.
func gopathCurrent() (string, error) {
gopathAll := os.Getenv("GOPATH")
if gopathAll == "" {
return "", fmt.Errorf("must be run from a gopath")
}
return strings.Split(gopathAll, ":")[0], nil
}
// closestVendorDir walks up from dir until it finds the vendor directory.
func closestVendorDir(dir string) (string, error) {
dir = filepath.Clean(dir)
for dir != "" && dir != string(filepath.Separator) { // TODO(stevvooe): May not work on windows
vendor := filepath.Join(dir, "vendor")
fi, err := os.Stat(vendor)
if err != nil {
if os.IsNotExist(err) {
// up we go!
dir = filepath.Dir(dir)
continue
}
return "", err
}
if !fi.IsDir() {
// up we go!
dir = filepath.Dir(dir)
continue
}
return vendor, nil
}
return "", fmt.Errorf("no vendor dir found")
}