license.py

import glob
import os
import zipfile
import tempfile

# https://stackoverflow.com/questions/25738523/how-to-update-one-file-inside-zip-file-using-python
def updateZip(zipname, filename, newFile):
    # generate a temp file
    tmpfd, tmpname = tempfile.mkstemp(dir=os.path.dirname(zipname))
    os.close(tmpfd)

    # create a temp copy of the archive without filename            
    with zipfile.ZipFile(zipname, 'r') as zin:
        with zipfile.ZipFile(tmpname, 'w') as zout:
            zout.comment = zin.comment # preserve the comment
            for item in zin.infolist():
                if item.filename != filename:
                    zout.writestr(item, zin.read(item.filename))

    # replace with the temp archive
    os.remove(zipname)
    os.rename(tmpname, zipname)

    # now add filename with its new data
    with zipfile.ZipFile(zipname, mode='a', compression=zipfile.ZIP_DEFLATED) as zf:
        zf.write(newFile)

def updateCategories(rootUrl, licenseUrl):
    categories = glob.glob(rootUrl)

    for category in categories:
        zipFiles = glob.glob(category + "/*.zip")
        for zipFile in zipFiles:
            updateZip(zipFile, "rkhive.txt", licenseUrl)

licenseFile = "./rkhive.txt"
updateCategories("./new/*", licenseFile)
updateCategories("./rk-download/*", licenseFile)