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util: Document the VolBootable FSCTL #429

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util: Document the VolBootable FSCTL #429

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3 changes: 2 additions & 1 deletion src/util.py
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Original file line number Diff line number Diff line change
Expand Up @@ -366,7 +366,8 @@ def fsctl_apfs_bootable(path, cmd):
func.argtypes = (c_char_p, c_ulong, POINTER(c_int), c_uint)
c_fsctl = func
c_cmd = c_int(cmd)
err = c_fsctl(path.encode(), 0xc0044a57, byref(c_cmd), 0)
APFSIOC_VOL_BOOTABLE = 0xc0044a57 # _IOWR('J', 'W', int32_t)
err = c_fsctl(path.encode(), APFSIOC_VOL_BOOTABLE, byref(c_cmd), 0)
if err == -1:
raise Exception(f'fsctl call failed, errno: {get_errno()}')
return c_cmd.value
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