Revision e9a2d318

b/image_creator/disk.py
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            self.out.success('looks like an image file')
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            sourcedev = self._losetup(self.source)
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        elif not stat.S_ISBLK(mode):
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            raise ValueError("Invalid media source. Only block devices, "
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            raise FatalError("Invalid media source. Only block devices, "
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                             "regular files and directories are supported.")
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        else:
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            self.out.success('looks like a block device')

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