vendor tsgo

tools/tsgo/internal/nativepath/realpath_windows.go

@@ -0,0 +1,100 @@
+package nativepath
+
+import (
+	"errors"
+	"os"
+	"syscall"
+
+	"golang.org/x/sys/windows"
+)
+
+// This implementation is based on what Node's fs.realpath.native does, via libuv: https://github.com/libuv/libuv/blob/ec5a4b54f7da7eeb01679005c615fee9633cdb3b/src/win/fs.c#L2937
+
+func Realpath(path string) (string, error) {
+	var h windows.Handle
+	if len(path) < 248 {
+		var err error
+		h, err = openMetadata(path)
+		if err != nil {
+			return "", err
+		}
+		defer windows.CloseHandle(h) //nolint:errcheck
+	} else {
+		// For long paths, defer to os.Open to run the path through fixLongPath.
+		f, err := os.Open(path)
+		if err != nil {
+			return "", err
+		}
+		defer f.Close()
+
+		// Works on directories too since https://go.dev/cl/405275.
+		h = windows.Handle(f.Fd())
+	}
+
+	// based on https://github.com/golang/go/blob/f4e3ec3dbe3b8e04a058d266adf8e048bab563f2/src/os/file_windows.go#L389
+
+	const _VOLUME_NAME_DOS = 0
+
+	buf := make([]uint16, 310) // https://github.com/microsoft/go-winio/blob/3c9576c9346a1892dee136329e7e15309e82fb4f/internal/stringbuffer/wstring.go#L13
+	for {
+		n, err := windows.GetFinalPathNameByHandle(h, &buf[0], uint32(len(buf)), _VOLUME_NAME_DOS)
+		if err != nil {
+			return "", err
+		}
+		if n < uint32(len(buf)) {
+			break
+		}
+		buf = make([]uint16, n)
+	}
+
+	s := syscall.UTF16ToString(buf)
+	if len(s) > 4 && s[:4] == `\\?\` {
+		s = s[4:]
+		if len(s) > 3 && s[:3] == `UNC` {
+			// return path like \\server\share\...
+			return `\` + s[3:], nil
+		}
+		return s, nil
+	}
+
+	return "", errors.New("GetFinalPathNameByHandle returned unexpected path: " + s)
+}
+
+func openMetadata(path string) (windows.Handle, error) {
+	// based on https://github.com/microsoft/go-winio/blob/3c9576c9346a1892dee136329e7e15309e82fb4f/pkg/fs/resolve.go#L113
+
+	pathUTF16, err := windows.UTF16PtrFromString(path)
+	if err != nil {
+		return windows.InvalidHandle, err
+	}
+
+	const (
+		_FILE_ANY_ACCESS = 0
+
+		_FILE_SHARE_READ   = 0x01
+		_FILE_SHARE_WRITE  = 0x02
+		_FILE_SHARE_DELETE = 0x04
+
+		_OPEN_EXISTING = 0x03
+
+		_FILE_FLAG_BACKUP_SEMANTICS = 0x0200_0000
+	)
+
+	h, err := windows.CreateFile(
+		pathUTF16,
+		_FILE_ANY_ACCESS,
+		_FILE_SHARE_READ|_FILE_SHARE_WRITE|_FILE_SHARE_DELETE,
+		nil,
+		_OPEN_EXISTING,
+		_FILE_FLAG_BACKUP_SEMANTICS,
+		0,
+	)
+	if err != nil {
+		return 0, &os.PathError{
+			Op:   "CreateFile",
+			Path: path,
+			Err:  err,
+		}
+	}
+	return h, nil
+}