50 lines
1 KiB
Go
50 lines
1 KiB
Go
package main
|
|
|
|
import (
|
|
"flag"
|
|
"fmt"
|
|
"os"
|
|
"os/exec"
|
|
"strings"
|
|
"syscall"
|
|
)
|
|
|
|
var rootPath = flag.String("root", "", "path to root directory")
|
|
var initCmd = flag.String("init", "/sbin/init", "init command")
|
|
var workdir = flag.String("workdir", "/", "work directory")
|
|
|
|
func main() {
|
|
flag.Parse()
|
|
|
|
if *rootPath == "" {
|
|
fmt.Println("root directory not set")
|
|
os.Exit(1)
|
|
}
|
|
|
|
initParts := strings.Split(*initCmd, " ")
|
|
cmd := exec.Command(initParts[0], initParts[1:]...)
|
|
cmd.Dir = *workdir
|
|
cmd.SysProcAttr = &syscall.SysProcAttr{
|
|
Chroot: *rootPath,
|
|
Cloneflags: syscall.CLONE_NEWUSER|syscall.CLONE_NEWPID,
|
|
UidMappings: []syscall.SysProcIDMap{
|
|
{ContainerID: 0, HostID: os.Getuid(), Size: 1},
|
|
},
|
|
GidMappings: []syscall.SysProcIDMap{
|
|
{ContainerID: 0, HostID: os.Getgid(), Size: 1},
|
|
},
|
|
}
|
|
cmd.Stdin = os.Stdin
|
|
cmd.Stdout = os.Stdout
|
|
cmd.Stderr = os.Stderr
|
|
err := cmd.Start()
|
|
if err != nil {
|
|
fmt.Printf("failed to start: %s\n", err)
|
|
}
|
|
|
|
err = cmd.Wait()
|
|
if err != nil {
|
|
fmt.Printf("process exited with error: %s\n", err)
|
|
}
|
|
}
|