create_directories throws exception even if error_code is specified

[xuefer@…]

code

	boost::system::error_code errorCode;
	fs::create_directories(backupDirectory, errorCode);

error

Unhandled exception at 0x75c5b9bc in UsbPhoneWD.exe: Microsoft C++ exception: boost::filesystem3::filesystem_error at memory location 0x0257b6d0..

backtrace

>	a.exe!`anonymous namespace'::process_status_failure(const boost::filesystem3::path & p, boost::system::error_code * ec)  Line 623 + 0x4b bytes	C++
 	a.exe!boost::filesystem3::detail::status(const boost::filesystem3::path & p, boost::system::error_code * ec)  Line 1627 + 0x11 bytes	C++
 	a.exe!boost::filesystem3::exists(const boost::filesystem3::path & p)  Line 289 + 0x30 bytes	C++
 	a.exe!boost::filesystem3::detail::create_directories(const boost::filesystem3::path & p, boost::system::error_code * ec)  Line 927 + 0x18 bytes	C++
 	a.exe!boost::filesystem3::create_directories(const boost::filesystem3::path & p, boost::system::error_code & ec)  Line 403 + 0x2b bytes	C++

boost::filesystem3::detail::create_directories Line 927

  BOOST_FILESYSTEM_DECL
  bool create_directories(const path& p, system::error_code* ec)
  {
    if (p.empty() || exists(p)) <- this is Line 927
    {
      if (!p.empty() && !is_directory(p))
      {
        if (ec == 0)
        BOOST_FILESYSTEM_THROW(filesystem_error(
            "boost::filesystem::create_directories", p,
            error_code(system::errc::file_exists, system::generic_category())));
        else ec->assign(system::errc::file_exists, system::generic_category());
      }
      return false;
    }

    // First create branch, by calling ourself recursively
    create_directories(p.parent_path(), ec);
    // Now that parent's path exists, create the directory
    create_directory(p, ec);
    return true;
  }

maybe "error_code dummy" should be pass to exists() and is_directory() to avoid throwing exception, just like create_directory do

[xuefer@…]

btw, it is reproduced when backupDirectory is a directory that has empty permission, every single permission is removed from the directory. (NTFS)

[Beman Dawes]

(In [78721]) Filesystem: fix #6932, create_directories throws exception even if error_code is specified.

[xuefer@…]

before i make some time to test it, i doubt this patch, are you sure it is fixed and the test passes?

the exception is thrown by exists() call because no error_code is pass to it (check the call stack (the backtrace) i post).

in [78721], create_directories still call exists(p) not error_code dummy; exists(p, dummy) like create_directory do currently.

[Beman Dawes]

See 78747.

--Beman