This is mostly just refactoring to make the code more manageable and extendable. It doesn't introduce any semantic changes, but it "optimizes" the communication with udevd a bit: * If an option is used multiple times, only one command will be sent. If the option takes a value, the value of the final appearance of the option is used. The only exception is --property, which is additive by nature. * Options --start-exec-queue and --stop-exec-queue are handled together. Only one of START_QUEUE/STOP_QUEUE commands will be sent to udevd even if both options appear on the command line.
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