abc_save_load_meta.py

import cask, shutil, json

def save_meta(path, meta):
    tmp = path+'.tmp'
    shutil.copy2(path, tmp)
    a = cask.Archive(tmp)
    #exists_prop = a.top.properties
    pr = cask.Property()
    pr.set_value(json.dumps(meta))
    a.top.properties['jmeta'] = pr
    #for k, v in exists_prop.items():
    #    a.top.properties[k] = v
    a.write_to_file(path, 1)
    a.close()
    a = None
    del a
    os.remove(tmp)


def read_meta(path):
    a = cask.Archive(path)
    out = {}
    if a.top.properties.get('jmeta'):
        out = json.loads(a.top.properties['jmeta'].get_value())
    a.close()
    return out