/
util.go
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/
util.go
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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package build
import (
"bufio"
"bytes"
"flag"
"fmt"
"go/parser"
"go/token"
"io"
"log"
"os"
"os/exec"
"path"
"path/filepath"
"strings"
"text/template"
"time"
)
var DryRunFlag = flag.Bool("n", false, "dry run, don't execute commands")
// MustRun executes the given command and exits the host process for
// any error.
func MustRun(cmd *exec.Cmd) {
fmt.Println(">>>", strings.Join(cmd.Args, " "))
if !*DryRunFlag {
cmd.Stderr = os.Stderr
cmd.Stdout = os.Stdout
if err := cmd.Run(); err != nil {
log.Fatal(err)
}
}
}
func MustRunCommand(cmd string, args ...string) {
MustRun(exec.Command(cmd, args...))
}
var warnedAboutGit bool
// RunGit runs a git subcommand and returns its output.
// The command must complete successfully.
func RunGit(args ...string) string {
cmd := exec.Command("git", args...)
var stdout, stderr bytes.Buffer
cmd.Stdout, cmd.Stderr = &stdout, &stderr
if err := cmd.Run(); err != nil {
if e, ok := err.(*exec.Error); ok && e.Err == exec.ErrNotFound {
if !warnedAboutGit {
log.Println("Warning: can't find 'git' in PATH")
warnedAboutGit = true
}
return ""
}
log.Fatal(strings.Join(cmd.Args, " "), ": ", err, "\n", stderr.String())
}
return strings.TrimSpace(stdout.String())
}
// readGitFile returns content of file in .git directory.
func readGitFile(file string) string {
content, err := os.ReadFile(path.Join(".git", file))
if err != nil {
return ""
}
return strings.TrimSpace(string(content))
}
// Render renders the given template file into outputFile.
func Render(templateFile, outputFile string, outputPerm os.FileMode, x interface{}) {
tpl := template.Must(template.ParseFiles(templateFile))
render(tpl, outputFile, outputPerm, x)
}
// RenderString renders the given template string into outputFile.
func RenderString(templateContent, outputFile string, outputPerm os.FileMode, x interface{}) {
tpl := template.Must(template.New("").Parse(templateContent))
render(tpl, outputFile, outputPerm, x)
}
func render(tpl *template.Template, outputFile string, outputPerm os.FileMode, x interface{}) {
if err := os.MkdirAll(filepath.Dir(outputFile), 0755); err != nil {
log.Fatal(err)
}
out, err := os.OpenFile(outputFile, os.O_CREATE|os.O_WRONLY|os.O_EXCL, outputPerm)
if err != nil {
log.Fatal(err)
}
if err := tpl.Execute(out, x); err != nil {
log.Fatal(err)
}
if err := out.Close(); err != nil {
log.Fatal(err)
}
}
// UploadSFTP uploads files to a remote host using the sftp command line tool.
// The destination host may be specified either as [user@]host[: or as a URI in
// the form sftp://[user@]host[:port].
func UploadSFTP(identityFile, host, dir string, files []string) error {
sftp := exec.Command("sftp")
sftp.Stderr = os.Stderr
if identityFile != "" {
sftp.Args = append(sftp.Args, "-i", identityFile)
}
sftp.Args = append(sftp.Args, host)
fmt.Println(">>>", strings.Join(sftp.Args, " "))
if *DryRunFlag {
return nil
}
stdin, err := sftp.StdinPipe()
if err != nil {
return fmt.Errorf("can't create stdin pipe for sftp: %v", err)
}
stdout, err := sftp.StdoutPipe()
if err != nil {
return fmt.Errorf("can't create stdout pipe for sftp: %v", err)
}
if err := sftp.Start(); err != nil {
return err
}
in := io.MultiWriter(stdin, os.Stdout)
for _, f := range files {
fmt.Fprintln(in, "put", f, path.Join(dir, filepath.Base(f)))
}
fmt.Fprintln(in, "exit")
// Some issue with the PPA sftp server makes it so the server does not
// respond properly to a 'bye', 'exit' or 'quit' from the client.
// To work around that, we check the output, and when we see the client
// exit command, we do a hard exit.
// See
// https://github.com/kolban-google/sftp-gcs/issues/23
// https://github.com/mscdex/ssh2/pull/1111
aborted := false
go func() {
scanner := bufio.NewScanner(stdout)
for scanner.Scan() {
txt := scanner.Text()
fmt.Println(txt)
if txt == "sftp> exit" {
// Give it .5 seconds to exit (server might be fixed), then
// hard kill it from the outside
time.Sleep(500 * time.Millisecond)
aborted = true
sftp.Process.Kill()
}
}
}()
stdin.Close()
err = sftp.Wait()
if aborted {
return nil
}
return err
}
// FindMainPackages finds all 'main' packages in the given directory and returns their
// package paths.
func FindMainPackages(dir string) []string {
var commands []string
cmds, err := os.ReadDir(dir)
if err != nil {
log.Fatal(err)
}
for _, cmd := range cmds {
pkgdir := filepath.Join(dir, cmd.Name())
pkgs, err := parser.ParseDir(token.NewFileSet(), pkgdir, nil, parser.PackageClauseOnly)
if err != nil {
log.Fatal(err)
}
for name := range pkgs {
if name == "main" {
path := "./" + filepath.ToSlash(pkgdir)
commands = append(commands, path)
break
}
}
}
return commands
}