/
addmod.go
223 lines (200 loc) · 5.61 KB
/
addmod.go
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// Copyright 2018 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.
// The txtar-addmod command adds a module as a txtar archive to the a testdata module directory
// as understood by the goproxytest package (see https://godoc.org/github.com/rogpeppe/go-internal/goproxytest).
//
// Usage:
//
// txtar-addmod dir path@version...
//
// where dir is the directory to add the module to.
//
// In general, it's intended to be used only for very small modules - we do not want to check
// very large files into testdata/mod.
//
// It is acceptable to edit the archive afterward to remove or shorten files.
//
package main
import (
"bytes"
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"os/exec"
"path/filepath"
"strings"
"github.com/rogpeppe/go-internal/module"
"github.com/rogpeppe/go-internal/txtar"
)
func usage() {
fmt.Fprintf(os.Stderr, "usage: txtar-addmod dir path@version...\n")
flag.PrintDefaults()
fmt.Fprintf(os.Stderr, `
The txtar-addmod command adds a module as a txtar archive to the
testdata module directory as understood by the goproxytest package
(see https://godoc.org/github.com/rogpeppe/go-internal/goproxytest).
The dir argument names to directory to add the module to. If dir is "-",
the result will instead be written to the standard output in a form
suitable for embedding directly into a testscript txtar file, with each
file prefixed with the ".gomodproxy" directory.
In general, txtar-addmod is intended to be used only for very small
modules - we do not want to check very large files into testdata/mod.
It is acceptable to edit the archive afterward to remove or shorten files.
`)
os.Exit(2)
}
var tmpdir string
func fatalf(format string, args ...interface{}) {
os.RemoveAll(tmpdir)
log.Fatalf(format, args...)
}
const goCmd = "go"
func main() {
os.Exit(main1())
}
var allFiles = flag.Bool("all", false, "include all source files")
func main1() int {
flag.Usage = usage
flag.Parse()
if flag.NArg() < 2 {
usage()
}
targetDir := flag.Arg(0)
modules := flag.Args()[1:]
log.SetPrefix("txtar-addmod: ")
log.SetFlags(0)
var err error
tmpdir, err = ioutil.TempDir("", "txtar-addmod-")
if err != nil {
log.Fatal(err)
}
run := func(command string, args ...string) string {
cmd := exec.Command(command, args...)
cmd.Dir = tmpdir
var stderr bytes.Buffer
cmd.Stderr = &stderr
out, err := cmd.Output()
if err != nil {
fatalf("%s %s: %v\n%s", command, strings.Join(args, " "), err, stderr.Bytes())
}
return string(out)
}
var goEnv struct {
GOPATH string
GOMODCACHE string
}
if err := json.Unmarshal([]byte(run("go", "env", "-json", "GOPATH", "GOMODCACHE")), &goEnv); err != nil {
fatalf("cannot unmarshal 'go env -json': %v", err)
}
modCache := goEnv.GOMODCACHE
if modCache == "" {
// For Go 1.14 and older.
modCache = filepath.Join(goEnv.GOPATH, "pkg", "mod")
}
exitCode := 0
for _, arg := range modules {
if err := ioutil.WriteFile(filepath.Join(tmpdir, "go.mod"), []byte("module m\n"), 0666); err != nil {
fatalf("%v", err)
}
run(goCmd, "get", "-d", arg)
path := arg
if i := strings.Index(path, "@"); i >= 0 {
path = path[:i]
}
out := run(goCmd, "list", "-m", "-f={{.Path}} {{.Version}} {{.Dir}}", path)
f := strings.Fields(out)
if len(f) != 3 {
log.Printf("go list -m %s: unexpected output %q", arg, out)
exitCode = 1
continue
}
path, vers, dir := f[0], f[1], f[2]
encpath, err := module.EncodePath(path)
if err != nil {
log.Printf("failed to encode path %q: %v", path, err)
continue
}
path = encpath
mod, err := ioutil.ReadFile(filepath.Join(modCache, "cache", "download", path, "@v", vers+".mod"))
if err != nil {
log.Printf("%s: %v", arg, err)
exitCode = 1
continue
}
info, err := ioutil.ReadFile(filepath.Join(modCache, "cache", "download", path, "@v", vers+".info"))
if err != nil {
log.Printf("%s: %v", arg, err)
exitCode = 1
continue
}
a := new(txtar.Archive)
title := arg
if !strings.Contains(arg, "@") {
title += "@" + vers
}
dir = filepath.Clean(dir)
modDir := strings.Replace(path, "/", "_", -1) + "_" + vers
filePrefix := ""
if targetDir == "-" {
filePrefix = ".gomodproxy/" + modDir + "/"
} else {
// No comment if we're writing to stdout.
a.Comment = []byte(fmt.Sprintf("module %s\n\n", title))
}
a.Files = []txtar.File{
{Name: filePrefix + ".mod", Data: mod},
{Name: filePrefix + ".info", Data: info},
}
err = filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
if !info.Mode().IsRegular() {
return nil
}
// TODO: skip dirs like "testdata" or "_foo" unless -all
// is given?
name := info.Name()
switch {
case *allFiles:
case name == "go.mod":
case strings.HasSuffix(name, ".go"):
default:
// the name is not in the whitelist, and we're
// not including all files via -all
return nil
}
data, err := ioutil.ReadFile(path)
if err != nil {
return err
}
a.Files = append(a.Files, txtar.File{
Name: filePrefix + strings.TrimPrefix(path, dir+string(filepath.Separator)),
Data: data,
})
return nil
})
if err != nil {
log.Printf("%s: %v", arg, err)
exitCode = 1
continue
}
data := txtar.Format(a)
if targetDir == "-" {
if _, err := os.Stdout.Write(data); err != nil {
log.Printf("cannot write output: %v", err)
exitCode = 1
break
}
} else {
if err := ioutil.WriteFile(filepath.Join(targetDir, modDir+".txt"), data, 0666); err != nil {
log.Printf("%s: %v", arg, err)
exitCode = 1
continue
}
}
}
os.RemoveAll(tmpdir)
return exitCode
}