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fork.go
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fork.go
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package main
import (
"fmt"
"os"
"os/exec"
"runtime"
"strconv"
"github.com/gotoz/runq/pkg/vm"
"golang.org/x/sys/unix"
)
func newEntrypoint(entrypoint vm.Entrypoint) (*exec.Cmd, error) {
runtime.LockOSThread()
dataReader, dataWriter, err := os.Pipe()
if err != nil {
return nil, fmt.Errorf("os.Pipe() failed: %w", err)
}
cmd := &exec.Cmd{
Path: "/proc/self/exe",
Args: append([]string{"entrypoint"}, entrypoint.Args...),
ExtraFiles: []*os.File{dataReader},
Stdout: os.Stdout,
Stderr: os.Stderr,
Stdin: os.Stdin,
SysProcAttr: &unix.SysProcAttr{
Setsid: true,
Setctty: true,
Cloneflags: unix.CLONE_NEWPID | unix.CLONE_NEWNS | unix.CLONE_NEWIPC,
},
}
if err := cmd.Start(); err != nil {
return nil, err
}
if err := dataReader.Close(); err != nil {
return nil, fmt.Errorf("dataReader.Close() failed: %w", err)
}
gob, err := vm.Encode(entrypoint)
if err != nil {
return nil, fmt.Errorf("vm.Encode() failed: %w", err)
}
if _, err := dataWriter.Write(gob); err != nil {
return nil, fmt.Errorf("dataWriter.Write() failed: %w", err)
}
if err := dataWriter.Close(); err != nil {
return nil, fmt.Errorf("dataWriter.Close() failed: %w", err)
}
return cmd, nil
}
func newVsockd(vsockd vm.Vsockd, nspid int) (*exec.Cmd, error) {
dataReader, dataWriter, err := os.Pipe()
if err != nil {
return nil, fmt.Errorf("os.Pipe() failed: %w", err)
}
cmd := &exec.Cmd{
Path: "/sbin/vsockd",
Args: []string{"vsockd", strconv.Itoa(nspid)},
ExtraFiles: []*os.File{dataReader},
Stdout: os.Stdout,
Stderr: os.Stderr,
Stdin: os.Stdin,
SysProcAttr: &unix.SysProcAttr{
Setpgid: true,
},
}
if err := cmd.Start(); err != nil {
return nil, err
}
if err := dataReader.Close(); err != nil {
return nil, fmt.Errorf("dataReader.Close() failed: %w", err)
}
gob, err := vm.Encode(vsockd)
if err != nil {
return nil, fmt.Errorf("newVsockd vm.Encode() failed: %w", err)
}
if _, err := dataWriter.Write(gob); err != nil {
return nil, fmt.Errorf("newVsockd dataWriter.Write() failed: %w", err)
}
if err := dataWriter.Close(); err != nil {
return nil, fmt.Errorf("newVsockd dataWriter.Close() failed: %w", err)
}
return cmd, nil
}