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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"
"os"
"os/exec"
"path/filepath"
"strings"
"text/template"
)
var (
tmpl = template.Must(template.New("protoc").Parse(`protoc -I
{{- range $index, $include := .Includes -}}
{{if $index}}` + string(filepath.ListSeparator) + `{{end -}}
{{.}}
{{- end -}}
{{- if .Descriptors}} --include_imports --descriptor_set_out={{.Descriptors}}{{- end -}}
{{ if lt .Version 2 }}
{{- range $index, $name := .Names }} --{{- $name -}}_out={{- $.GoOutV1 }}{{- end -}}
{{- else -}}
{{- range $gen := .Generators }} --{{- $gen.Name -}}_out={{- $gen.OutputDir }}
{{- range $k, $v := $gen.Parameters }} --{{- $gen.Name -}}_opt={{- $k -}}={{- $v -}}{{- end -}}
{{- end -}}
{{- end -}}
{{- range .Files}} {{.}}{{end -}}
`))
)
type generator struct {
Name string
OutputDir string
Parameters map[string]string
}
// protocParams defines inputs to a protoc command string.
type protocCmd struct {
Generators []generator
Includes []string
Descriptors string
Files []string
// Version is Protobuild's version.
Version int
// V1 fields
Names []string
OutputDir string
PackageMap map[string]string
Plugins []string
ImportPath string
}
func (p *protocCmd) mkcmd() (string, error) {
var buf bytes.Buffer
if err := tmpl.Execute(&buf, p); err != nil {
return "", err
}
return buf.String(), nil
}
// GoOutV1 returns the parameter for --go_out= for protoc-gen-go < 1.4.0.
// Note that plugins and import_path are no longer supported by
// newer protoc-gen-go versions.
func (p *protocCmd) GoOutV1() string {
var result string
if len(p.Plugins) > 0 {
result += "plugins=" + strings.Join(p.Plugins, "+") + ","
}
result += "import_path=" + p.ImportPath
for proto, pkg := range p.PackageMap {
result += fmt.Sprintf(",M%s=%s", proto, pkg)
}
result += ":" + p.OutputDir
return result
}
func (p *protocCmd) run() error {
arg, err := p.mkcmd()
if err != nil {
return err
}
// pass to sh -c so we don't need to re-split here.
args := []string{shArg, arg}
cmd := exec.Command(shCmd, args...)
cmd.Stderr = os.Stderr
cmd.Stdout = os.Stdout
return cmd.Run()
}
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