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27 lines
606 B
Python
27 lines
606 B
Python
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import sys, json, re
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# Arguments:
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region, version, arch, instance_type = sys.argv[1:]
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# Read bytes from stdin.
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dat = sys.stdin.read()
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# Be flexible. The Ubuntu AMI list is invalid JSON by having a comma
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# following the last element in a list.
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dat = re.sub(r",(\s*)\]", r"\1]", dat)
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# Parse JSON.
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dat = json.loads(dat)
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for item in dat["aaData"]:
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if item[0] == region and item[2] == version and item[3] == arch and item[4] == instance_type:
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ami_link = item[6]
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# The field comes in the form of <a href="...">ami-id</a>
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ami_link = re.sub(r"<.*?>", "", ami_link)
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print(ami_link)
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break
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