I need to start a new process in Go with the following requirements:
Here is an attempt:
var attr = os.ProcAttr {
Dir: "/bin",
Env: os.Environ(),
Files: []*os.File{
os.Stdin,
"stdout.log",
"stderr.log",
},
}
process, err := os.StartProcess("sleep", []string{"1"}, &attr)
This works fine but has the following shortcomings from the requirements:
This needs to run on Linux only if that simplifies things.
Here is a working version of your example (I did not check if process ID's where actually the one set )
package main
import "fmt"
import "os"
import "syscall"
const (
UID = 501
GUID = 100
)
func main() {
// The Credential fields are used to set UID, GID and attitional GIDS of the process
// You need to run the program as root to do this
var cred = &syscall.Credential{ UID, GUID, []uint32{} }
// the Noctty flag is used to detach the process from parent tty
var sysproc = &syscall.SysProcAttr{ Credential:cred, Noctty:true }
var attr = os.ProcAttr{
Dir: ".",
Env: os.Environ(),
Files: []*os.File{
os.Stdin,
nil,
nil,
},
Sys:sysproc,
}
process, err := os.StartProcess("/bin/sleep", []string{"/bin/sleep", "100"}, &attr)
if err == nil {
// It is not clear from docs, but Realease actually detaches the process
err = process.Release();
if err != nil {
fmt.Println(err.Error())
}
} else {
fmt.Println(err.Error())
}
}