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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build ignore
// +build ignore
//go:generate go run ./copier.go
// Copier is a tool to automate copy of govulncheck's internal files.
//
// - copy golang.org/x/vuln/internal/osv/ to osv
// - copy golang.org/x/vuln/internal/govulncheck/ to govulncheck
package main
import (
"bytes"
"encoding/json"
"fmt"
"go/parser"
"go/token"
"log"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"golang.org/x/tools/internal/edit"
)
func main() {
log.SetPrefix("copier: ")
log.SetFlags(log.Lshortfile)
srcMod := "golang.org/x/vuln"
srcModVers := "@latest"
srcDir, srcVer := downloadModule(srcMod + srcModVers)
cfg := rewrite{
banner: fmt.Sprintf("// Code generated by copying from %v@%v (go run copier.go); DO NOT EDIT.", srcMod, srcVer),
srcImportPath: "golang.org/x/vuln/internal",
dstImportPath: currentPackagePath(),
}
copyFiles("osv", filepath.Join(srcDir, "internal", "osv"), cfg)
copyFiles("govulncheck", filepath.Join(srcDir, "internal", "govulncheck"), cfg)
}
type rewrite struct {
// DO NOT EDIT marker to add at the beginning
banner string
// rewrite srcImportPath with dstImportPath
srcImportPath string
dstImportPath string
}
func copyFiles(dst, src string, cfg rewrite) {
entries, err := os.ReadDir(src)
if err != nil {
log.Fatalf("failed to read dir: %v", err)
}
if err := os.MkdirAll(dst, 0777); err != nil {
log.Fatalf("failed to create dir: %v", err)
}
for _, e := range entries {
fname := e.Name()
// we need only non-test go files.
if e.IsDir() || !strings.HasSuffix(fname, ".go") || strings.HasSuffix(fname, "_test.go") {
continue
}
data, err := os.ReadFile(filepath.Join(src, fname))
if err != nil {
log.Fatal(err)
}
fset := token.NewFileSet()
f, err := parser.ParseFile(fset, fname, data, parser.ParseComments|parser.ImportsOnly)
if err != nil {
log.Fatalf("parsing source module:\n%s", err)
}
buf := edit.NewBuffer(data)
at := func(p token.Pos) int {
return fset.File(p).Offset(p)
}
// Add banner right after the copyright statement (the first comment)
bannerInsert, banner := f.FileStart, cfg.banner
if len(f.Comments) > 0 && strings.HasPrefix(f.Comments[0].Text(), "Copyright ") {
bannerInsert = f.Comments[0].End()
banner = "\n\n" + banner
}
buf.Replace(at(bannerInsert), at(bannerInsert), banner)
// Adjust imports
for _, spec := range f.Imports {
path, err := strconv.Unquote(spec.Path.Value)
if err != nil {
log.Fatal(err)
}
if strings.HasPrefix(path, cfg.srcImportPath) {
newPath := strings.Replace(path, cfg.srcImportPath, cfg.dstImportPath, 1)
buf.Replace(at(spec.Path.Pos()), at(spec.Path.End()), strconv.Quote(newPath))
}
}
data = buf.Bytes()
if err := os.WriteFile(filepath.Join(dst, fname), data, 0666); err != nil {
log.Fatal(err)
}
}
}
func downloadModule(srcModVers string) (dir, ver string) {
var stdout, stderr bytes.Buffer
cmd := exec.Command("go", "mod", "download", "-json", srcModVers)
cmd.Stdout = &stdout
cmd.Stderr = &stderr
if err := cmd.Run(); err != nil {
log.Fatalf("go mod download -json %s: %v\n%s%s", srcModVers, err, stderr.Bytes(), stdout.Bytes())
}
var info struct {
Dir string
Version string
}
if err := json.Unmarshal(stdout.Bytes(), &info); err != nil {
log.Fatalf("go mod download -json %s: invalid JSON output: %v\n%s%s", srcModVers, err, stderr.Bytes(), stdout.Bytes())
}
return info.Dir, info.Version
}
func currentPackagePath() string {
var stdout, stderr bytes.Buffer
cmd := exec.Command("go", "list", ".")
cmd.Stdout = &stdout
cmd.Stderr = &stderr
if err := cmd.Run(); err != nil {
log.Fatalf("go list: %v\n%s%s", err, stderr.Bytes(), stdout.Bytes())
}
return strings.TrimSpace(stdout.String())
}
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