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// +build !windows
package osutil
import (
"fmt"
"os"
"os/exec"
"os/user"
"strconv"
"syscall"
)
// IsolateProcess change gpid for the process to avoid bypassing signals to php processes.
func IsolateProcess(cmd *exec.Cmd) {
cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true, Pgid: 0}
}
// ExecuteFromUser may work only if run RR under root user
func ExecuteFromUser(cmd *exec.Cmd, u string) error {
usr, err := user.Lookup(u)
if err != nil {
return err
}
usrI32, err := strconv.Atoi(usr.Uid)
if err != nil {
return err
}
grI32, err := strconv.Atoi(usr.Gid)
if err != nil {
return err
}
// For more information:
// https://www.man7.org/linux/man-pages/man7/user_namespaces.7.html
// https://www.man7.org/linux/man-pages/man7/namespaces.7.html
if _, err := os.Stat("/proc/self/ns/user"); err != nil {
if os.IsNotExist(err) {
return fmt.Errorf("kernel doesn't support user namespaces")
}
if os.IsPermission(err) {
return fmt.Errorf("unable to test user namespaces due to permissions")
}
return fmt.Errorf("failed to stat /proc/self/ns/user: %v", err)
}
cmd.SysProcAttr.Credential = &syscall.Credential{
Uid: uint32(usrI32),
Gid: uint32(grI32),
}
return nil
}
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