commit c1a48a018f255485c2a2b54263272a8243b2bdc9
Author: Mikael CAPELLE <mikael.capelle@thalesaleniaspace.com>
Date:   Wed Aug 7 16:10:57 2024 +0200

    Initial commit.

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b6e761a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+**/__pycache__
+usvfs.log
diff --git a/data/.gitkeep b/data/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/list-nt-query.py b/list-nt-query.py
new file mode 100644
index 0000000..2b0c886
--- /dev/null
+++ b/list-nt-query.py
@@ -0,0 +1,99 @@
+import argparse
+import ctypes
+import os.path
+from pathlib import Path
+
+import win32file
+
+
+class FILE_DIRECTORY_INFORMATION(ctypes.Structure):
+    _fields_ = [
+        ("NextEntryOffset", ctypes.c_uint32),
+        ("FileIndex", ctypes.c_uint32),
+        ("CreationTime", ctypes.c_int64),
+        ("LastAccessTime", ctypes.c_int64),
+        ("LastWriteTime", ctypes.c_int64),
+        ("ChangeTime", ctypes.c_int64),
+        ("EndOfFile", ctypes.c_int64),
+        ("AllocationSize", ctypes.c_int64),
+        ("FileAttributes", ctypes.c_uint32),
+        ("FileNameLength", ctypes.c_uint32),
+        ("FileName", ctypes.c_wchar),
+    ]
+
+
+def main():
+    parser = argparse.ArgumentParser("list directory using NtQueryOpenFile")
+    parser.add_argument("-r", "--recurse", action="store_true", help="list recursively")
+    parser.add_argument("directory", type=Path, help="directory to list")
+
+    args = parser.parse_args()
+    recursive: bool = args.recurse
+    directory: Path = args.directory
+
+    kernel32 = ctypes.windll.LoadLibrary("kernel32.dll")
+    ntdll = ctypes.windll.LoadLibrary("ntdll.dll")
+
+    h = kernel32.CreateFileW(
+        os.path.expanduser(str(directory)),
+        win32file.GENERIC_READ,
+        win32file.FILE_SHARE_READ | win32file.FILE_SHARE_WRITE,
+        0,
+        3,
+        win32file.FILE_FLAG_BACKUP_SEMANTICS,
+        0,
+    )
+
+    if h == -1:
+        print("failed to open directory")
+        exit(1)
+
+    print(f"handle={h}")
+
+    io_status_block = ctypes.create_string_buffer(64)
+    length = 1024
+    file_information_buffer = ctypes.create_string_buffer(length)
+
+    while (
+        ntdll.NtQueryDirectoryFile(
+            h,
+            0,
+            0,
+            0,
+            io_status_block,
+            file_information_buffer,
+            length,
+            1,
+            False,
+            0,
+            False,
+        )
+        == 0
+    ):
+        index = 0
+        while index < length:
+            file_information = FILE_DIRECTORY_INFORMATION.from_buffer(
+                file_information_buffer, index
+            )
+            print(
+                "{name} ({length}) -> {offset}".format(
+                    offset=file_information.NextEntryOffset,
+                    length=file_information.FileNameLength,
+                    name=ctypes.wstring_at(
+                        ctypes.addressof(file_information)
+                        + FILE_DIRECTORY_INFORMATION.FileName.offset,
+                        file_information.FileNameLength // 2,
+                    ),
+                )
+            )
+
+            if file_information.NextEntryOffset == 0:
+                break
+
+            index += file_information.NextEntryOffset
+
+    kernel32.CloseHandle(h)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..851be1d
--- /dev/null
+++ b/main.py
@@ -0,0 +1,35 @@
+from pathlib import Path
+
+import usvfs as usvfs_p
+
+usvfs = usvfs_p.USVFS("./usvfs_x64.dll")
+print(f"USVFS version: {usvfs.version()}")
+
+parameters = usvfs.make_parameters()
+parameters.instance_name = "instance"
+parameters.debug_mode = False
+parameters.log_level = usvfs_p.LogLevel.Debug
+parameters.crash_dumps_type = usvfs_p.CrashDumpType.Off
+parameters.crash_dumps_path = ""
+
+filesystem = usvfs.make_virtual_filesystem()
+
+filesystem.link_directory("./virtual", "./data", recursive=True)
+
+usvfs.connect_virtual_filesystem(parameters, filesystem)
+
+usvfs.run_hooked_process(R"cmd.exe /C dir .\data\subvirtual", cwd=Path())
+
+usvfs.run_hooked_process(
+    R"C:\Users\MikaelCAPELLE\.envs\MO2\Scripts\python.exe list-nt-query.py .\data\subvirtual",
+    cwd=Path(),
+)
+
+usvfs.run_hooked_process(
+    R'''python -c "from pathlib import Path; print(list(Path('data').glob('**/*')))"'''
+)
+
+with open("usvfs.log", "w") as fp:
+    fp.write("\n".join(usvfs.get_log_messages()) + "\n")
+
+usvfs.disconnect_virtual_filesystem()
diff --git a/usvfs.py b/usvfs.py
new file mode 100644
index 0000000..5b727ac
--- /dev/null
+++ b/usvfs.py
@@ -0,0 +1,410 @@
+from __future__ import annotations
+
+import ctypes
+import ctypes.util
+import dataclasses
+from datetime import timedelta
+from enum import Enum
+from pathlib import Path
+from typing import Final, Literal, overload
+
+
+class _C_USVFSParameters(ctypes.Structure):
+    _fields_ = (
+        ("instanceName", ctypes.c_char * 65),
+        ("currentSHMName", ctypes.c_char * 65),
+        ("currentInverseSHMName", ctypes.c_char * 65),
+        ("debugMode", ctypes.c_bool),
+        ("logLevel", ctypes.c_uint8),
+        ("crashDumpsType", ctypes.c_uint8),
+        ("crashDumpsPath", ctypes.c_char),
+    )
+
+
+class _C_STARTUPINFOW(ctypes.Structure):
+    _fields_ = (
+        ("cb", ctypes.c_int32),
+        ("lpReserved", ctypes.c_wchar_p),
+        ("lpDesktop", ctypes.c_wchar_p),
+        ("lpTitle", ctypes.c_wchar_p),
+        ("dwX", ctypes.c_int32),
+        ("dwY", ctypes.c_int32),
+        ("dwXSize", ctypes.c_int32),
+        ("dwYSize", ctypes.c_int32),
+        ("dwXCountChars", ctypes.c_int32),
+        ("dwYCountChars", ctypes.c_int32),
+        ("dwFillAttribute", ctypes.c_int32),
+        ("dwFlags", ctypes.c_int32),
+        ("wShowWindow", ctypes.c_int16),
+        ("cbReserved2", ctypes.c_int16),
+        ("lpReserved2", ctypes.POINTER(ctypes.c_int8)),
+        ("hStdInput", ctypes.c_void_p),
+        ("hStdOutput", ctypes.c_void_p),
+        ("hStdError", ctypes.c_void_p),
+    )
+
+
+class _C_PROCESS_INFORMATION(ctypes.Structure):
+    _fields_ = (
+        ("hProcess", ctypes.c_void_p),
+        ("hThread", ctypes.c_void_p),
+        ("dwProcessId", ctypes.c_int32),
+        ("dwThreadId", ctypes.c_int32),
+    )
+
+
+class LogLevel(Enum):
+    Debug = 0
+    Info = 1
+    Warning = 2
+    Error = 3
+
+
+class CrashDumpType(Enum):
+    Off = 0
+    Mini = 1
+    Data = 2
+    Full = 3
+
+
+class USVFSParameters:
+    def __init__(self, usvfs: ctypes.WinDLL):
+        self._usvfs = usvfs
+        self._c_params = usvfs.usvfsCreateParameters()
+
+    def __del__(self):
+        self._usvfs.usvfsFreeParameters(self._c_params)
+
+    @property
+    def instance_name(self) -> str:
+        return self._c_params.contents.instanceName.decode()
+
+    @instance_name.setter
+    def instance_name(self, value: str) -> None:
+        self._usvfs.usvfsSetInstanceName(self._c_params, value.encode())
+
+    @property
+    def current_shm_name(self) -> str:
+        return self._c_params.contents.currentSHMName.decode()
+
+    @property
+    def current_inverse_shm_name(self) -> str:
+        return self._c_params.contents.currentInverseSHMName.decode()
+
+    @property
+    def debug_mode(self) -> bool:
+        return self._c_params.contents.debugMode
+
+    @debug_mode.setter
+    def debug_mode(self, debug: bool) -> None:
+        self._usvfs.usvfsSetDebugMode(self._c_params, debug)
+
+    @property
+    def log_level(self) -> LogLevel:
+        return LogLevel(self._c_params.contents.logLevel)
+
+    @log_level.setter
+    def log_level(self, level: LogLevel) -> None:
+        self._usvfs.usvfsSetLogLevel(self._c_params, level.value)
+
+    @property
+    def crash_dumps_type(self) -> CrashDumpType:
+        return CrashDumpType(self._c_params.contents.crashDumpsType)
+
+    @crash_dumps_type.setter
+    def crash_dumps_type(self, dump_type: CrashDumpType) -> None:
+        self._usvfs.usvfsSetCrashDumpType(self._c_params, dump_type.value)
+
+    @property
+    def crash_dumps_path(self) -> Path:
+        return Path(self._c_params.contents.crashDumpsPath.decode())
+
+    @crash_dumps_path.setter
+    def crash_dumps_path(self, path: Path | str) -> None:
+        self._usvfs.usvfsSetCrashDumpPath(self._c_params, str(path).encode())
+
+
+_LINKFLAG_FAILIFEXISTS = 0x00000001
+_LINKFLAG_MONITORCHANGES = 0x00000002
+_LINKFLAG_CREATETARGET = 0x00000004
+_LINKFLAG_RECURSIVE = 0x00000008
+_LINKFLAG_FAILIFSKIPPED = 0x00000010
+
+
+class VFS:
+    @dataclasses.dataclass(frozen=True)
+    class _Entry:
+        mode: Literal["file", "directory"]
+        source: str
+        target: str
+        flags: int
+
+    def __init__(self) -> None:
+        self._entries: list[VFS._Entry] = []
+
+    def link_file(
+        self,
+        source: Path | str,
+        destination: Path | str,
+        *,
+        fail_if_exists: bool = False,
+        fail_if_skipped: bool = False,
+    ) -> None:
+        self._entries.append(
+            VFS._Entry(
+                mode="file",
+                source=str(Path(source).absolute()),
+                target=str(Path(destination).absolute()),
+                flags=(fail_if_exists and _LINKFLAG_FAILIFEXISTS)
+                | (fail_if_skipped and _LINKFLAG_FAILIFSKIPPED),
+            )
+        )
+
+    def link_directory(
+        self,
+        source: Path | str,
+        destination: Path | str,
+        *,
+        fail_if_exists: bool = False,
+        monitor_changes: bool = False,
+        recursive: bool = False,
+        create_target: bool = False,
+        fail_if_skipped: bool = False,
+    ) -> None:
+        self._entries.append(
+            VFS._Entry(
+                mode="directory",
+                source=str(Path(source).absolute()),
+                target=str(Path(destination).absolute()),
+                flags=(fail_if_exists and _LINKFLAG_FAILIFEXISTS)
+                | (monitor_changes and _LINKFLAG_MONITORCHANGES)
+                | (recursive and _LINKFLAG_RECURSIVE)
+                | (create_target and _LINKFLAG_CREATETARGET)
+                | (fail_if_skipped and _LINKFLAG_FAILIFSKIPPED),
+            )
+        )
+
+
+class Process:
+    def __init__(self, command: str, cwd: Path | None):
+        self.command: Final = command
+        self.cwd: Final = cwd
+
+        self.si = _C_STARTUPINFOW()
+        self.si.cb = ctypes.sizeof(_C_STARTUPINFOW)
+        self.pi = _C_PROCESS_INFORMATION()
+
+    @property
+    def process_handle(self) -> int:
+        return self.pi.hProcess
+
+    @property
+    def thread_handle(self) -> int:
+        return self.pi.hThread
+
+    @property
+    def process_id(self) -> int:
+        return self.pi.dwProcessId
+
+    @property
+    def thread_id(self) -> int:
+        return self.pi.dwThreadId
+
+
+class USVFS:
+    instance: USVFS | None = None
+
+    def __init__(
+        self, path: Path | str, logging: bool | Literal["console"] = True
+    ) -> None:
+        assert USVFS.instance is None
+        USVFS.instance = self
+
+        self._usvfs = ctypes.windll.LoadLibrary(str(path))
+        self._usvfs.usvfsCreateParameters.restype = ctypes.POINTER(_C_USVFSParameters)
+        self._usvfs.usvfsVersionString.restype = ctypes.c_char_p
+        self._usvfs.usvfsGetVFSProcessList2.argtypes = (
+            ctypes.POINTER(ctypes.c_size_t),
+            ctypes.POINTER(ctypes.POINTER(ctypes.c_int32)),
+        )
+
+        self._vfs: VFS | None = None
+
+        self._process_by_id: dict[int, Process] = {}
+
+        if logging:
+            self._usvfs.usvfsInitLogging(logging == "console")
+
+    def version(self) -> str:
+        return self._usvfs.usvfsVersionString().decode()
+
+    def print_debug_info(self):
+        self._usvfs.usvfsPrintDebugInfo()
+
+    def make_parameters(self) -> USVFSParameters:
+        return USVFSParameters(self._usvfs)
+
+    def make_virtual_filesystem(self) -> VFS:
+        return VFS()
+
+    def connect_virtual_filesystem(
+        self, parameters: USVFSParameters, filesystem: VFS, disconnect: bool = False
+    ) -> None:
+        if self._vfs is not None and not disconnect:
+            raise ValueError("cannot connect to two virtual filesystem at once")
+
+        if disconnect:
+            self.disconnect_virtual_filesystem()
+
+        self._usvfs.usvfsConnectVFS(parameters._c_params)  # pyright: ignore[reportPrivateUsage]
+
+        self._vfs = filesystem
+
+        for entry in self._vfs._entries:  # pyright: ignore[reportPrivateUsage]
+            func = (
+                self._usvfs.usvfsVirtualLinkFile
+                if entry.mode == "file"
+                else self._usvfs.usvfsVirtualLinkDirectoryStatic
+            )
+            func(entry.source, entry.target, entry.flags)
+
+    def disconnect_virtual_filesystem(self) -> None:
+        if self._vfs is not None:
+            self._usvfs.usvfsDisconnectVFS()
+            self._vfs = None
+
+    @overload
+    def run_hooked_process(
+        self,
+        command: str,
+        *,
+        cwd: Path | None = None,
+        wait: Literal[False],
+    ) -> Process: ...
+
+    @overload
+    def run_hooked_process(
+        self,
+        command: str,
+        cwd: Path | None = None,
+        wait: timedelta | Literal["infinite"] = "infinite",
+    ) -> Process: ...
+
+    def run_hooked_process(
+        self,
+        command: str,
+        cwd: Path | None = None,
+        wait: timedelta | Literal["infinite"] | Literal[False] = "infinite",
+    ) -> Process | int:
+        p = Process(command, cwd)
+        create_ret = self._usvfs.usvfsCreateProcessHooked(
+            0,
+            command,
+            0,
+            0,
+            False,
+            0,
+            0,
+            0 if cwd is None else str(cwd),
+            ctypes.pointer(p.si),
+            ctypes.pointer(p.pi),
+        )
+
+        if create_ret == 0:
+            raise Exception("failed to create process")
+
+        self._process_by_id[p.process_id] = p
+
+        if wait:
+            return self.wait_for_process(p, wait)
+
+        return p
+
+    def wait_for_process(
+        self, process: Process, wait: timedelta | Literal["infinite"] = "infinite"
+    ) -> int:
+        wait_i: int = 2**32 - 1  # INFINITE
+        if wait != "infinite":
+            wait_i = int(wait.total_seconds() * 1000)
+
+        if (
+            ctypes.windll.kernel32.WaitForSingleObject(process.process_handle, wait_i)
+            != 0
+        ):
+            raise Exception("failed to wait for process")
+
+        exit_code = ctypes.c_int32(99)
+        if not ctypes.windll.kernel32.GetExitCodeProcess(
+            process.process_handle, ctypes.pointer(exit_code)
+        ):
+            raise Exception("failed to get process exist code")
+
+        ctypes.windll.kernel32.CloseHandle(process.process_handle)
+        ctypes.windll.kernel32.CloseHandle(process.pi.hThread)
+
+        del self._process_by_id[process.process_id]
+
+        return exit_code.value
+
+    def get_hooked_processes(self) -> list[Process]:
+        size = ctypes.c_size_t(0)
+        buffer = ctypes.POINTER(ctypes.c_int32)()
+        if (
+            self._usvfs.usvfsGetVFSProcessList2(
+                ctypes.byref(size), ctypes.byref(buffer)
+            )
+            == 0
+        ):
+            raise Exception("failed to get VFS process list")
+
+        if size.value == 0:
+            return []
+
+        processes = [
+            process
+            for i in range(0, size.value)
+            if (process := self._process_by_id.get(buffer[i], None)) is not None
+        ]
+
+        # this crashes, I don't know why
+        # ctypes.cdll.msvcrt.free(ctypes.cast(buffer, ctypes.c_void_p))
+
+        return processes
+
+    def get_log_messages(self) -> list[str]:
+        size = 2048
+        buffer = ctypes.create_string_buffer(size)
+
+        messages: list[str] = []
+        while self._usvfs.usvfsGetLogMessages(buffer, size, False):
+            messages.append(buffer.value.decode())
+
+        return messages
+
+    def add_blacklisted_executable(self, executable: str) -> None:
+        self._usvfs.usvfsBlacklistExecutable(executable)
+
+    def clear_blacklist_executables(self):
+        self._usvfs.usvfsClearExecutableBlacklist()
+
+    def add_force_loaded_library(self, process: str, library: str | Path) -> None:
+        self._usvfs.usvfsForceLoadLibrary(process, str(library))
+
+    def clear_force_loaded_libraries(self):
+        self._usvfs.usvfsClearLibraryForceLoads()
+
+    def add_skip_file_suffix(self, suffix: str) -> None:
+        self._usvfs.usvfsAddSkipFileSuffix(suffix)
+
+    def clear_skip_file_suffixes(self):
+        self._usvfs.usvfsClearSkipFileSuffixes()
+
+    def add_skip_directory(self, name: str) -> None:
+        self._usvfs.usvfsAddSkipDirectory(name)
+
+    def clear_skip_directory(self):
+        self._usvfs.usvfsClearSkipDirectories()
+
+    def __del__(self) -> None:
+        del self._usvfs
+        USVFS.instance = None
diff --git a/usvfs_x64.dll b/usvfs_x64.dll
new file mode 100644
index 0000000..643d669
Binary files /dev/null and b/usvfs_x64.dll differ
diff --git a/virtual/base.txt b/virtual/base.txt
new file mode 100644
index 0000000..e69de29
diff --git a/virtual/subvirtual/sub.txt b/virtual/subvirtual/sub.txt
new file mode 100644
index 0000000..e69de29