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qapi: Reject -p arguments that break qapi-event.py
qapi-event.py breaks when you ask for a funny prefix like '@'. Protect it. Backports commit 1cf47a15f18312436c7fa2d97be5fbe6df0292f5 from qemu
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@ -1001,6 +1001,12 @@ def parse_command_line(extra_options = "", extra_long_options = []):
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for oa in opts:
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o, a = oa
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if o in ("-p", "--prefix"):
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match = re.match('([A-Za-z_.-][A-Za-z0-9_.-]*)?', a)
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if match.end() != len(a):
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print >>sys.stderr, \
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"%s: 'funny character '%s' in argument of --prefix" \
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% (sys.argv[0], a[match.end()])
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sys.exit(1)
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prefix = a
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elif o in ("-o", "--output-dir"):
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output_dir = a + "/"
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