Changelog information is spread across three headers in rpms.  It would be useful if rpmlib had a method that combined the data and that RpmWrapper objects exposed this through an attribute.  Sample code:

def get_changelogs(hdr, max=-1, timeformat="%a %b %d %Y"):
    if max == 0:
        return
    s = []
    names = get_header_field(hdr, 'CHANGELOGNAME')
    times = get_header_field(hdr, 'CHANGELOGTIME')
    text = get_header_field(hdr, 'CHANGELOGTEXT')
    i = 0
    while (i < max or max < 0) and i < len(names):
        if isinstance(times, int):
            time_value = time.gmtime(times)
        elif isinstance(times, list):
            time_value = time.gmtime(times[i])
        time_text = time.strftime(timeformat, time_value)
        s.append((time_value, "%s %s\n%s" % (time_text, names[i], text[i])))
        i += 1
    return s

@property
def changelogs(self):
    return kobo.rpmlib.get_changelogs(self.header)