Simplified in-memory execution

src/cli/Exec_test.go

@@ -16,6 +16,7 @@ func TestExec(t *testing.T) {
 	assert.Equal(t, cli.Exec([]string{"build", "../../examples/hello", "--dry", "--os", "mac", "--arch", "x86"}), 0)
 	assert.Equal(t, cli.Exec([]string{"build", "../../examples/hello", "--dry", "--os", "windows", "--arch", "arm"}), 0)
 	assert.Equal(t, cli.Exec([]string{"build", "../../examples/hello", "--dry", "--os", "windows", "--arch", "x86"}), 0)
+	assert.Equal(t, cli.Exec([]string{"run", "../../examples/hello"}), 0)
 	assert.Equal(t, cli.Exec([]string{"help"}), 0)
 }
 

src/memfile/Exec_linux.go

@@ -3,45 +3,17 @@
 package memfile
 
 import (
+	"fmt"
 	"os"
-	"strconv"
-	"syscall"
-	"unsafe"
-
-	"golang.org/x/sys/unix"
+	"os/exec"
 )
 
 // Exec executes an in-memory file.
 func Exec(file *os.File) error {
-	empty, err := syscall.BytePtrFromString("")
-
-	if err != nil {
-		return err
-	}
-
-	argv := []string{"/proc/self/fd/" + strconv.Itoa(int(file.Fd()))}
-	argvp, err := syscall.SlicePtrFromStrings(argv)
-
-	if err != nil {
-		return err
-	}
-
-	envv := os.Environ()
-	envvp, err := syscall.SlicePtrFromStrings(envv)
-
-	if err != nil {
-		return err
-	}
-
-	_, _, errno := syscall.Syscall6(
-		unix.SYS_EXECVEAT,
-		file.Fd(),
-		uintptr(unsafe.Pointer(empty)),
-		uintptr(unsafe.Pointer(&argvp[0])),
-		uintptr(unsafe.Pointer(&envvp[0])),
-		uintptr(unix.AT_EMPTY_PATH),
-		0,
-	)
-
-	return errno
+	defer file.Close()
+	cmd := exec.Command(fmt.Sprintf("/proc/self/fd/%d", file.Fd()))
+	cmd.Stdout = os.Stdout
+	cmd.Stdin = os.Stdin
+	cmd.Stderr = os.Stderr
+	return cmd.Run()
 }

src/memfile/New_other.go

@@ -10,7 +10,7 @@ import (
 
 // New creates a new anonymous in-memory file.
 func New(name string) (*os.File, error) {
-	pattern := ""
+	pattern := "*"
 
 	if global.OS == "windows" {
 		pattern = "*.exe"

src/memfile/memfile_test.go

@@ -1,15 +1,42 @@
 package memfile_test
 
 import (
+	"errors"
+	"io/fs"
 	"testing"
 
+	"git.urbach.dev/cli/q/src/build"
+	"git.urbach.dev/cli/q/src/compiler"
+	"git.urbach.dev/cli/q/src/linker"
 	"git.urbach.dev/cli/q/src/memfile"
 	"git.urbach.dev/go/assert"
 )
 
-func TestNew(t *testing.T) {
+func TestEmptyFile(t *testing.T) {
 	file, err := memfile.New("")
 	assert.Nil(t, err)
 	assert.NotNil(t, file)
-	// memfile.Exec can't be tested because it would replace the test executable
+
+	err = memfile.Exec(file)
+	assert.NotNil(t, err)
+
+	err = file.Close()
+	assert.True(t, errors.Is(err, fs.ErrClosed))
+}
+
+func TestHelloExample(t *testing.T) {
+	file, err := memfile.New("")
+	assert.Nil(t, err)
+	assert.NotNil(t, file)
+
+	b := build.New("../../examples/hello")
+	env, err := compiler.Compile(b)
+	assert.Nil(t, err)
+
+	linker.Write(file, b, env)
+	err = memfile.Exec(file)
+	assert.Nil(t, err)
+
+	err = file.Close()
+	assert.True(t, errors.Is(err, fs.ErrClosed))
 }