mirror of https://github.com/commaai/openpilot.git
46 lines
1.6 KiB
Python
46 lines
1.6 KiB
Python
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import os
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from cffi import FFI
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# Workaround for the EON/termux build of Python having os.*xattr removed.
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ffi = FFI()
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ffi.cdef("""
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int setxattr(const char *path, const char *name, const void *value, size_t size, int flags);
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ssize_t getxattr(const char *path, const char *name, void *value, size_t size);
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ssize_t listxattr(const char *path, char *list, size_t size);
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int removexattr(const char *path, const char *name);
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""")
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libc = ffi.dlopen(None)
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def setxattr(path, name, value, flags=0):
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path = path.encode()
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name = name.encode()
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if libc.setxattr(path, name, value, len(value), flags) == -1:
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raise OSError(ffi.errno, f"{os.strerror(ffi.errno)}: setxattr({path}, {name}, {value}, {flags})")
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def getxattr(path, name, size=128):
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path = path.encode()
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name = name.encode()
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value = ffi.new(f"char[{size}]")
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l = libc.getxattr(path, name, value, size)
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if l == -1:
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# errno 61 means attribute hasn't been set
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if ffi.errno == 61:
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return None
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raise OSError(ffi.errno, f"{os.strerror(ffi.errno)}: getxattr({path}, {name}, {size})")
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return ffi.buffer(value)[:l]
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def listxattr(path, size=128):
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path = path.encode()
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attrs = ffi.new(f"char[{size}]")
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l = libc.listxattr(path, attrs, size)
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if l == -1:
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raise OSError(ffi.errno, f"{os.strerror(ffi.errno)}: listxattr({path}, {size})")
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# attrs is b'\0' delimited values (so chop off trailing empty item)
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return [a.decode() for a in ffi.buffer(attrs)[:l].split(b"\0")[0:-1]]
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def removexattr(path, name):
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path = path.encode()
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name = name.encode()
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if libc.removexattr(path, name) == -1:
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raise OSError(ffi.errno, f"{os.strerror(ffi.errno)}: removexattr({path}, {name})")
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