check directory and file and print sane errors

waggle-sensor / waggle_image

Scripts to create waggle disk images

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check directory and file and print sane errors #17

Closed nikhil003 closed 6 years ago

nikhil003 commented 6 years ago

Added some bits of code to check if the directory and image for a preceding stage exists or print a error message and exit. It also checks for the directories (stage*) to be present.