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// Copyright 2017 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package osutil
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"time"
)
const (
DefaultDirPerm = 0755
DefaultFilePerm = 0644
DefaultExecPerm = 0755
)
// RunCmd runs "bin args..." in dir with timeout and returns its output.
func RunCmd(timeout time.Duration, dir, bin string, args ...string) ([]byte, error) {
return runCmd(timeout, nil, dir, bin, args...)
}
// RunCmdEnv is the same as RunCmd but also appends env.
func RunCmdEnv(timeout time.Duration, env []string, dir, bin string, args ...string) ([]byte, error) {
return runCmd(timeout, env, dir, bin, args...)
}
func runCmd(timeout time.Duration, env []string, dir, bin string, args ...string) ([]byte, error) {
output := new(bytes.Buffer)
cmd := exec.Command(bin, args...)
cmd.Dir = dir
cmd.Stdout = output
cmd.Stderr = output
cmd.Env = append([]string{}, os.Environ()...)
cmd.Env = append(cmd.Env, env...)
if err := cmd.Start(); err != nil {
return nil, fmt.Errorf("failed to start %v %+v: %v", bin, args, err)
}
done := make(chan bool)
go func() {
select {
case <-time.After(time.Hour):
cmd.Process.Kill()
case <-done:
}
}()
defer close(done)
if err := cmd.Wait(); err != nil {
return nil, fmt.Errorf("failed to run %v %+v: %v\n%v", bin, args, err, output.String())
}
return output.Bytes(), nil
}
var wd string
func init() {
var err error
wd, err = os.Getwd()
if err != nil {
panic(fmt.Sprintf("failed to get wd: %v", err))
}
}
func Abs(path string) string {
if wd1, err := os.Getwd(); err == nil && wd1 != wd {
panic("don't mess with wd in a concurrent program")
}
if path == "" || filepath.IsAbs(path) {
return path
}
return filepath.Join(wd, path)
}
// IsExist returns true if the file name exists.
func IsExist(name string) bool {
_, err := os.Stat(name)
return err == nil
}
// FilesExist returns true if all files exist in dir.
// Files are assumed to be relative names in slash notation.
func FilesExist(dir string, files []string) bool {
for _, f := range files {
if !IsExist(filepath.Join(dir, filepath.FromSlash(f))) {
return false
}
}
return true
}
// CopyFiles copies files from srcDir to dstDir as atomically as possible.
// Files are assumed to be relative names in slash notation.
// All other files in dstDir are removed.
func CopyFiles(srcDir, dstDir string, files []string) error {
// Linux does not support atomic dir replace, so we copy to tmp dir first.
// Then remove dst dir and rename tmp to dst (as atomic as can get on Linux).
tmpDir := dstDir + ".tmp"
if err := os.RemoveAll(tmpDir); err != nil {
return err
}
if err := MkdirAll(tmpDir); err != nil {
return err
}
for _, f := range files {
src := filepath.Join(srcDir, filepath.FromSlash(f))
dst := filepath.Join(tmpDir, filepath.FromSlash(f))
if err := MkdirAll(filepath.Dir(dst)); err != nil {
return err
}
if err := CopyFile(src, dst); err != nil {
return err
}
}
if err := os.RemoveAll(dstDir); err != nil {
return err
}
return os.Rename(tmpDir, dstDir)
}
// LinkFiles creates hard links for files from dstDir to srcDir.
// Files are assumed to be relative names in slash notation.
// All other files in dstDir are removed.
func LinkFiles(srcDir, dstDir string, files []string) error {
if err := os.RemoveAll(dstDir); err != nil {
return err
}
if err := MkdirAll(dstDir); err != nil {
return err
}
for _, f := range files {
src := filepath.Join(srcDir, filepath.FromSlash(f))
dst := filepath.Join(dstDir, filepath.FromSlash(f))
if err := MkdirAll(filepath.Dir(dst)); err != nil {
return err
}
if err := os.Link(src, dst); err != nil {
return err
}
}
return nil
}
func MkdirAll(dir string) error {
return os.MkdirAll(dir, DefaultDirPerm)
}
func WriteFile(filename string, data []byte) error {
return ioutil.WriteFile(filename, data, DefaultFilePerm)
}
func WriteExecFile(filename string, data []byte) error {
return ioutil.WriteFile(filename, data, DefaultExecPerm)
}
// Return all files in a directory.
func ListDir(dir string) ([]string, error) {
f, err := os.Open(dir)
if err != nil {
return nil, err
}
defer f.Close()
return f.Readdirnames(-1)
}
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