mirror of
https://github.com/dortania/OpenCore-Legacy-Patcher.git
synced 2026-04-11 16:27:19 +10:00
110 lines
3.3 KiB
Python
110 lines
3.3 KiB
Python
"""
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properties.py: Query volume properties for a given path using macOS's getattrlist.
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"""
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import ctypes
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class attrreference_t(ctypes.Structure):
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_fields_ = [
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("attr_dataoffset", ctypes.c_int32),
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("attr_length", ctypes.c_uint32)
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]
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class attrlist_t(ctypes.Structure):
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_fields_ = [
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("bitmapcount", ctypes.c_ushort),
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("reserved", ctypes.c_uint16),
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("commonattr", ctypes.c_uint),
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("volattr", ctypes.c_uint),
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("dirattr", ctypes.c_uint),
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("fileattr", ctypes.c_uint),
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("forkattr", ctypes.c_uint)
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]
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class volattrbuf(ctypes.Structure):
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_fields_ = [
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("length", ctypes.c_uint32),
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("mountPoint", attrreference_t),
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("volCapabilities", ctypes.c_uint64),
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("mountPointSpace", ctypes.c_char * 1024),
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]
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class PathAttributes:
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def __init__(self, path: str) -> None:
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self._path = path
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if not isinstance(self._path, str):
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try:
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self._path = str(self._path)
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except:
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raise ValueError(f"Invalid path: {path}")
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_libc = ctypes.CDLL("/usr/lib/libc.dylib")
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# Reference:
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# https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getattrlist.2.html
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try:
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self._getattrlist = _libc.getattrlist
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except AttributeError:
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return
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self._getattrlist.argtypes = [
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ctypes.c_char_p, # Path
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ctypes.POINTER(attrlist_t), # Attribute list
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ctypes.c_void_p, # Attribute buffer
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ctypes.c_ulong, # Attribute buffer size
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ctypes.c_ulong # Options
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]
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self._getattrlist.restype = ctypes.c_int
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# Reference:
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# https://github.com/apple-oss-distributions/xnu/blob/xnu-10063.121.3/bsd/sys/attr.h
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ATTR_BIT_MAP_COUNT = 0x00000005
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ATTR_VOL_MOUNTPOINT = 0x00001000
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ATTR_VOL_CAPABILITIES = 0x00020000
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attrList = attrlist_t()
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attrList.bitmapcount = ATTR_BIT_MAP_COUNT
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attrList.volattr = ATTR_VOL_MOUNTPOINT | ATTR_VOL_CAPABILITIES
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volAttrBuf = volattrbuf()
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if self._getattrlist(self._path.encode(), ctypes.byref(attrList), ctypes.byref(volAttrBuf), ctypes.sizeof(volAttrBuf), 0) != 0:
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return
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self._volAttrBuf = volAttrBuf
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def supports_clonefile(self) -> bool:
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"""
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Verify if path provided supports Apple's clonefile function.
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Equivalent to checking for Copy on Write support.
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"""
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VOL_CAP_INT_CLONE = 0x00010000
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if not hasattr(self, "_volAttrBuf"):
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return False
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if self._volAttrBuf.volCapabilities & VOL_CAP_INT_CLONE:
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return True
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return False
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def mount_point(self) -> str:
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"""
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Return mount point of path.
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"""
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if not hasattr(self, "_volAttrBuf"):
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return ""
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mount_point_ptr = ctypes.cast(
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ctypes.addressof(self._volAttrBuf.mountPoint) + self._volAttrBuf.mountPoint.attr_dataoffset,
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ctypes.POINTER(ctypes.c_char * self._volAttrBuf.mountPoint.attr_length)
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)
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return mount_point_ptr.contents.value.decode() |