I'm currently finalising a patch that adds key-file support to
cryptodisk::cryptomount and luks.
As well as being able to grub_device_iterate(hook,...) to search the
existing devices for the key-file the code needs to wait for TIMEOUT
seconds for additional (usually USB Mass Storage) devices to be
connected and when they are search them for the key-file.
Is there an existing mechanism to receive such notifications, or a
blocking call that returns if a device is connected or a timeout is hit?
Otherwise it looks like I'll have to track which devices are connected
when the TIMEOUT loop is first entered, grub_sleep(), then
grub_device_iterate() and see if the device list has any new entries.
Secondly: am I correct to think using grub_search_fs_file(keyfile_name,
variable_name, ...) is the correct way to search for the key-file across
all devices, or do I need to use a specific hint type to indicate all
devices should be searched?
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