nixpkgs/pkgs/build-support/docker/detjson.py

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Deterministic layer json: https://github.com/docker/hub-feedback/issues/488
import sys
reload(sys)
sys.setdefaultencoding('UTF8')
import json
# If any of the keys below are equal to a certain value
# then we can delete it because it's the default value
SAFEDELS = {
"Size": 0,
"config": {
"ExposedPorts": None,
"MacAddress": "",
"NetworkDisabled": False,
"PortSpecs": None,
"VolumeDriver": ""
}
}
SAFEDELS["container_config"] = SAFEDELS["config"]
def makedet(j, safedels):
for k,v in safedels.items():
if k not in j:
continue
if type(v) == dict:
makedet(j[k], v)
elif j[k] == v:
del j[k]
def main():
j = json.load(sys.stdin)
makedet(j, SAFEDELS)
json.dump(j, sys.stdout, sort_keys=True)
if __name__ == '__main__':
main()