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/*
* Copyright 2012-2022 Li Kexian
*
* 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.
*
* A toolkit for Golang development
* https://www.likexian.com/
*/
package xos
import (
"bytes"
"context"
"os"
"os/exec"
"os/user"
"path/filepath"
"strconv"
"syscall"
"time"
)
// Version returns package version
func Version() string {
return "0.7.0"
}
// Author returns package author
func Author() string {
return "[Li Kexian](https://www.likexian.com/)"
}
// License returns package license
func License() string {
return "Licensed under the Apache License 2.0"
}
// Getenv returns system environment variable or default value
func Getenv(name, def string) string {
value := os.Getenv(name)
if value != "" {
return value
}
return def
}
// Exec exec command and returns
func Exec(cmd string, args ...string) (stdout, stderr string, err error) {
bufOut := new(bytes.Buffer)
bufErr := new(bytes.Buffer)
c := exec.Command(cmd, args...)
c.Stdout = bufOut
c.Stderr = bufErr
err = c.Run()
return bufOut.String(), bufErr.String(), err
}
// TimeoutExec exec command with timeout and returns
func TimeoutExec(timeout int, cmd string, args ...string) (stdout, stderr string, err error) {
ctx, cancel := context.WithTimeout(context.Background(), time.Duration(timeout)*time.Second)
defer cancel()
bufOut := new(bytes.Buffer)
bufErr := new(bytes.Buffer)
c := exec.Command(cmd, args...)
c.Stdout = bufOut
c.Stderr = bufErr
c.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
if err = c.Start(); err != nil {
return
}
end := make(chan bool, 1)
defer close(end)
go func() {
select {
case <-ctx.Done():
_ = syscall.Kill(-c.Process.Pid, syscall.SIGKILL)
return
case <-end:
return
}
}()
if err = c.Wait(); err != nil {
return
}
return bufOut.String(), bufErr.String(), err
}
// SetUser Set process user
func SetUser(user string) (err error) {
uid, gid, err := LookupUser(user)
if err != nil {
return
}
err = SetGID(gid)
if err == nil {
err = SetUID(uid)
}
return
}
// LookupUser returns the uid and gid of user
func LookupUser(name string) (uid, gid int, err error) {
u, err := user.Lookup(name)
if err != nil {
return
}
uid, err = strconv.Atoi(u.Uid)
if err == nil {
gid, err = strconv.Atoi(u.Gid)
}
return
}
// SetUID set the uid of process
func SetUID(uid int) (err error) {
_, _, errno := syscall.RawSyscall(syscall.SYS_SETUID, uintptr(uid), 0, 0)
if errno != 0 {
err = errno
}
return
}
// SetGID set the gid of process
func SetGID(gid int) (err error) {
_, _, errno := syscall.RawSyscall(syscall.SYS_SETGID, uintptr(gid), 0, 0)
if errno != 0 {
err = errno
}
return
}
// GetPwd returns the abs dir of current path
func GetPwd() string {
dir, _ := filepath.Abs(filepath.Dir(os.Args[0]))
return dir
}
// GetProcPwd returns the abs dir of current execution file
func GetProcPwd() string {
file, _ := exec.LookPath(os.Args[0])
dir, _ := filepath.Abs(filepath.Dir(file))
return dir
}
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