container: remove setup pipe helper

The API forces use of finalizer to close the read end of the setup pipe, which is no longer considered acceptable. Exporting this as part of package container also imposes unnecessary maintenance burden.

Signed-off-by: Ophestra <cat@gensokyo.uk>

container/params_test.go

@@ -1,10 +1,8 @@
 package container_test
 
 import (
-	"encoding/gob"
 	"errors"
 	"os"
-	"slices"
 	"strconv"
 	"syscall"
 	"testing"
@@ -52,74 +50,4 @@ func TestSetupReceive(t *testing.T) {
 			t.Errorf("Receive: error = %v, want %v", err, syscall.EDOM)
 		}
 	})
-
-	t.Run("setup receive", func(t *testing.T) {
-		check := func(t *testing.T, useNilFdp bool) {
-			const key = "TEST_SETUP_RECEIVE"
-			payload := []uint64{syscall.MS_MGC_VAL, syscall.MS_MGC_MSK, syscall.MS_ASYNC, syscall.MS_ACTIVE}
-
-			encoderDone := make(chan error, 1)
-			extraFiles := make([]*os.File, 0, 1)
-			deadline, _ := t.Deadline()
-			if fd, f, err := container.Setup(&extraFiles); err != nil {
-				t.Fatalf("Setup: error = %v", err)
-			} else if fd != 3 {
-				t.Fatalf("Setup: fd = %d, want 3", fd)
-			} else {
-				if err = f.SetDeadline(deadline); err != nil {
-					t.Fatal(err.Error())
-				}
-				go func() { encoderDone <- gob.NewEncoder(f).Encode(payload) }()
-			}
-
-			if len(extraFiles) != 1 {
-				t.Fatalf("extraFiles: len = %v, want 1", len(extraFiles))
-			}
-
-			var dupFd int
-			if fd, err := syscall.Dup(int(extraFiles[0].Fd())); err != nil {
-				t.Fatalf("Dup: error = %v", err)
-			} else {
-				syscall.CloseOnExec(fd)
-				dupFd = fd
-				t.Setenv(key, strconv.Itoa(fd))
-			}
-
-			var (
-				gotPayload []uint64
-				fdp        *uintptr
-			)
-			if !useNilFdp {
-				fdp = new(uintptr)
-			}
-			var closeFile func() error
-			if f, err := container.Receive(key, &gotPayload, fdp); err != nil {
-				t.Fatalf("Receive: error = %v", err)
-			} else {
-				closeFile = f
-
-				if !slices.Equal(payload, gotPayload) {
-					t.Errorf("Receive: %#v, want %#v", gotPayload, payload)
-				}
-			}
-			if !useNilFdp {
-				if int(*fdp) != dupFd {
-					t.Errorf("Fd: %d, want %d", *fdp, dupFd)
-				}
-			}
-
-			if err := <-encoderDone; err != nil {
-				t.Errorf("Encode: error = %v", err)
-			}
-
-			if closeFile != nil {
-				if err := closeFile(); err != nil {
-					t.Errorf("Close: error = %v", err)
-				}
-			}
-		}
-
-		t.Run("fp", func(t *testing.T) { check(t, false) })
-		t.Run("nil", func(t *testing.T) { check(t, true) })
-	})
 }