helper: rearrange initialisation args

This improves consistency across two different helper implementations.

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

helper/args_test.go

@@ -9,7 +9,7 @@ import (
 	"git.gensokyo.uk/security/fortify/helper"
 )
 
-func Test_argsFD_String(t *testing.T) {
+func Test_argsFd_String(t *testing.T) {
 	wantString := strings.Join(wantArgs, " ")
 	if got := argsWt.(fmt.Stringer).String(); got != wantString {
 		t.Errorf("String(): got %v; want %v",

helper/bwrap.go

@@ -51,17 +51,17 @@ func (b *bubblewrap) Start() error {
 // Function argF returns an array of arguments passed directly to the child process.
 func MustNewBwrap(
 	ctx context.Context,
-	conf *bwrap.Config,
 	name string,
-	setpgid bool,
 	wt io.WriterTo,
-	argF func(argsFD, statFD int) []string,
+	stat bool,
+	argF func(argsFd, statFd int) []string,
 	cmdF func(cmd *exec.Cmd),
+	conf *bwrap.Config,
+	setpgid bool,
 	extraFiles []*os.File,
 	syncFd *os.File,
-	stat bool,
 ) Helper {
-	b, err := NewBwrap(ctx, conf, name, setpgid, wt, argF, cmdF, extraFiles, syncFd, stat)
+	b, err := NewBwrap(ctx, name, wt, stat, argF, cmdF, conf, setpgid, extraFiles, syncFd)
 	if err != nil {
 		panic(err.Error())
 	} else {
@@ -74,20 +74,20 @@ func MustNewBwrap(
 // Function argF returns an array of arguments passed directly to the child process.
 func NewBwrap(
 	ctx context.Context,
-	conf *bwrap.Config,
 	name string,
-	setpgid bool,
 	wt io.WriterTo,
+	stat bool,
 	argF func(argsFd, statFd int) []string,
 	cmdF func(cmd *exec.Cmd),
+	conf *bwrap.Config,
+	setpgid bool,
 	extraFiles []*os.File,
 	syncFd *os.File,
-	stat bool,
 ) (Helper, error) {
 	b := new(bubblewrap)
 
 	b.name = name
-	b.helperCmd = newHelperCmd(ctx, BubblewrapName, wt, argF, extraFiles, stat)
+	b.helperCmd = newHelperCmd(ctx, BubblewrapName, wt, argF, stat, extraFiles)
 	if setpgid {
 		b.Cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
 	}

helper/bwrap_test.go

@@ -33,9 +33,10 @@ func TestBwrap(t *testing.T) {
 
 		h := helper.MustNewBwrap(
 			context.Background(),
-			sc, "fortify", false,
-			argsWt, argF, nil,
-			nil, nil, false,
+			"fortify",
+			argsWt, false,
+			argF, nil,
+			sc, false, nil, nil,
 		)
 
 		if err := h.Start(); !errors.Is(err, os.ErrNotExist) {
@@ -47,9 +48,10 @@ func TestBwrap(t *testing.T) {
 	t.Run("valid new helper nil check", func(t *testing.T) {
 		if got := helper.MustNewBwrap(
 			context.TODO(),
-			sc, "fortify", false,
-			argsWt, argF, nil,
-			nil, nil, false,
+			"fortify",
+			argsWt, false,
+			argF, nil,
+			sc, false, nil, nil,
 		); got == nil {
 			t.Errorf("MustNewBwrap(%#v, %#v, %#v) got nil",
 				sc, argsWt, "fortify")
@@ -68,22 +70,24 @@ func TestBwrap(t *testing.T) {
 
 		helper.MustNewBwrap(
 			context.TODO(),
-			&bwrap.Config{Hostname: "\x00"}, "fortify", false,
-			nil, argF, nil,
-			nil, nil, false,
+			"fortify",
+			nil, false,
+			argF, nil,
+			&bwrap.Config{Hostname: "\x00"}, false, nil, nil,
 		)
 	})
 
 	t.Run("start without pipes", func(t *testing.T) {
 		helper.InternalReplaceExecCommand(t)
 
-		c, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 		defer cancel()
 		stdout, stderr := new(strings.Builder), new(strings.Builder)
 		h := helper.MustNewBwrap(
-			c, sc, "crash-test-dummy", false,
-			nil, argFChecked, func(cmd *exec.Cmd) { cmd.Stdout, cmd.Stderr = stdout, stderr },
-			nil, nil, false,
+			ctx, "crash-test-dummy",
+			nil, false,
+			argFChecked, func(cmd *exec.Cmd) { cmd.Stdout, cmd.Stderr = stdout, stderr },
+			sc, false, nil, nil,
 		)
 
 		if err := h.Start(); err != nil {
@@ -101,8 +105,10 @@ func TestBwrap(t *testing.T) {
 	t.Run("implementation compliance", func(t *testing.T) {
 		testHelper(t, func(ctx context.Context, cmdF func(cmd *exec.Cmd), stat bool) helper.Helper {
 			return helper.MustNewBwrap(
-				ctx, sc, "crash-test-dummy", false,
-				argsWt, argF, cmdF, nil, nil, stat,
+				ctx, "crash-test-dummy",
+				argsWt, stat,
+				argF, cmdF,
+				sc, false, nil, nil,
 			)
 		})
 	})

helper/direct.go

@@ -17,14 +17,14 @@ import (
 // Function argF returns an array of arguments passed directly to the child process.
 func NewDirect(
 	ctx context.Context,
-	wt io.WriterTo,
 	name string,
+	wt io.WriterTo,
+	stat bool,
 	argF func(argsFd, statFd int) []string,
 	cmdF func(cmd *exec.Cmd),
-	stat bool,
 ) Helper {
 	d := new(direct)
-	d.helperCmd = newHelperCmd(ctx, name, wt, argF, nil, stat)
+	d.helperCmd = newHelperCmd(ctx, name, wt, argF, stat, nil)
 	if cmdF != nil {
 		cmdF(d.helperCmd.Cmd)
 	}
@@ -53,9 +53,12 @@ func (h *direct) Start() error {
 }
 
 func newHelperCmd(
-	ctx context.Context, name string,
-	wt io.WriterTo, argF func(argsFd, statFd int) []string,
-	extraFiles []*os.File, stat bool,
+	ctx context.Context,
+	name string,
+	wt io.WriterTo,
+	argF func(argsFd, statFd int) []string,
+	stat bool,
+	extraFiles []*os.File,
 ) (cmd *helperCmd) {
 	cmd = new(helperCmd)
 	cmd.ctx = ctx

helper/direct_test.go

@@ -12,7 +12,7 @@ import (
 
 func TestDirect(t *testing.T) {
 	t.Run("start non-existent helper path", func(t *testing.T) {
-		h := helper.NewDirect(context.Background(), argsWt, "/nonexistent", argF, nil, false)
+		h := helper.NewDirect(context.Background(), "/nonexistent", argsWt, false, argF, nil)
 
 		if err := h.Start(); !errors.Is(err, os.ErrNotExist) {
 			t.Errorf("Start: error = %v, wantErr %v",
@@ -21,7 +21,7 @@ func TestDirect(t *testing.T) {
 	})
 
 	t.Run("valid new helper nil check", func(t *testing.T) {
-		if got := helper.NewDirect(context.TODO(), argsWt, "fortify", argF, nil, false); got == nil {
+		if got := helper.NewDirect(context.TODO(), "fortify", argsWt, false, argF, nil); got == nil {
 			t.Errorf("New(%q, %q) got nil",
 				argsWt, "fortify")
 			return
@@ -30,7 +30,7 @@ func TestDirect(t *testing.T) {
 
 	t.Run("implementation compliance", func(t *testing.T) {
 		testHelper(t, func(ctx context.Context, cmdF func(cmd *exec.Cmd), stat bool) helper.Helper {
-			return helper.NewDirect(ctx, argsWt, "crash-test-dummy", argF, cmdF, stat)
+			return helper.NewDirect(ctx, "crash-test-dummy", argsWt, stat, argF, cmdF)
 		})
 	})
 }