Enforce that --source-dir can only be specified once
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		@@ -154,6 +154,8 @@ class MikesBackup:
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				a = a + 1
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									a = a + 1
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			elif arg == "--source-dir":
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								elif arg == "--source-dir":
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				valid_arg = True
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									valid_arg = True
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									if self.__source_dir:
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										raise Exception("--source-dir can only be used once")
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				self.__source_dir = sys.argv[a + 1]
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									self.__source_dir = sys.argv[a + 1]
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				self.log("Found source dir: " + sys.argv[a + 1])
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									self.log("Found source dir: " + sys.argv[a + 1])
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				a = a + 1
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									a = a + 1
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