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mads

setup: use old importlib_metadata version to fix kombu failing on python < 3.8

Many libraries use the importlib_metadata library as fallback when running on
Python versions older than 3.8 . For example setuptools when easy_install is
used for install the Kallithea console_scripts entrypoints in the bin folder.
The dependencies on importlib_metadata were indirect and without constrains on
version number.

The problem is that Celery uses Kombu, which (on Python < 3.8) uses
importlib_metadata in a way that is incompatible with importlib_metadata > 5.

Most obvious, building docs failed as:
Running Sphinx v5.1.1

Configuration error:
There is a programmable error in your configuration file:

Traceback (most recent call last):
File ".../kallithea/venv/lib64/python3.7/site-packages/sphinx/config.py", line 347, in eval_config_file
exec(code, namespace)
File ".../kallithea/docs/conf.py", line 17, in <module>
import kallithea
File ".../kallithea/kallithea/__init__.py", line 45, in <module>
CELERY_APP = celery.Celery() # needed at import time but is lazy and can be configured later
File ".../kallithea/venv/lib64/python3.7/site-packages/celery/local.py", line 492, in __getattr__
[name])
File ".../kallithea/venv/lib64/python3.7/site-packages/celery/app/__init__.py", line 2, in <module>
from celery import _state
File ".../kallithea/venv/lib64/python3.7/site-packages/celery/_state.py", line 15, in <module>
from celery.utils.threads import LocalStack
File ".../kallithea/venv/lib64/python3.7/site-packages/celery/utils/__init__.py", line 16, in <module>
from .nodenames import nodename, nodesplit, worker_direct
File ".../kallithea/venv/lib64/python3.7/site-packages/celery/utils/nodenames.py", line 6, in <module>
from kombu.entity import Exchange, Queue
File ".../kallithea/venv/lib64/python3.7/site-packages/kombu/entity.py", line 7, in <module>
from .serialization import prepare_accept_content
File ".../kallithea/venv/lib64/python3.7/site-packages/kombu/serialization.py", line 440, in <module>
for ep, args in entrypoints('kombu.serializers'): # pragma: no cover
File ".../kallithea/venv/lib64/python3.7/site-packages/kombu/utils/compat.py", line 82, in entrypoints
for ep in importlib_metadata.entry_points().get(namespace, [])
AttributeError: 'EntryPoints' object has no attribute 'get'

That made readthedocs builds fail, when it in the default web configuration
used Python 3.7 .

Fixed by introducing an explicit dependency on importlib_metadata < 5.

/**
 * Sphinx stylesheet -- default theme
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

@import url("basic.css");

/* -- page layout ----------------------------------------------------------- */

body {
    font-family: Arial, sans-serif;
    font-size: 100%;
    background-color: #111;
    color: #555;
    margin: 0;
    padding: 0;
}

div.documentwrapper {
    float: left;
    width: 100%;
}

div.bodywrapper {
    margin: 0 0 0 230px;
}

hr{
    border: 1px solid #B1B4B6;
}

div.document {
    background-color: #eee;
}

div.body {
    background-color: #ffffff;
    color: #3E4349;
    padding: 0 30px 30px 30px;
    font-size: 0.8em;
}

div.footer {
    color: #555;
    width: 100%;
    padding: 13px 0;
    text-align: center;
    font-size: 75%;
}

div.footer a {
    color: #444;
    text-decoration: underline;
}

div.related {
    background-color: #577632;
    line-height: 32px;
    color: #fff;
    text-shadow: 0px 1px 0 #444;
    font-size: 0.80em;
}

div.related a {
    color: #E2F3CC;
}

div.sphinxsidebar {
    font-size: 0.75em;
    line-height: 1.5em;
}

div.sphinxsidebarwrapper{
    padding: 20px 0;
}

div.sphinxsidebar h3,
div.sphinxsidebar h4 {
    font-family: Arial, sans-serif;
    color: #222;
    font-size: 1.2em;
    font-weight: normal;
    margin: 0;
    padding: 5px 10px;
    background-color: #ddd;
    text-shadow: 1px 1px 0 white
}

div.sphinxsidebar h4{
    font-size: 1.1em;
}

div.sphinxsidebar h3 a {
    color: #444;
}

div.sphinxsidebar p {
    color: #888;
    padding: 5px 20px;
}

div.sphinxsidebar p.topless {
}

div.sphinxsidebar ul {
    margin: 10px 20px;
    padding: 0;
    color: #000;
}

div.sphinxsidebar a {
    color: #444;
}

div.sphinxsidebar input {
    border: 1px solid #ccc;
    font-family: sans-serif;
    font-size: 1em;
}

div.sphinxsidebar input[type=text]{
    margin-left: 20px;
}

div.sphinxsidebar input[type=image] {
    border: 0;
}

/* -- body styles ----------------------------------------------------------- */

a {
    color: #005B81;
    text-decoration: none;
}

a:hover {
    color: #E32E00;
    text-decoration: underline;
}

div.body h1,
div.body h2,
div.body h3,
div.body h4,
div.body h5,
div.body h6 {
    font-family: Arial, sans-serif;
    background-color: #BED4EB;
    font-weight: normal;
    color: #212224;
    margin: 30px 0px 10px 0px;
    padding: 5px 0 5px 10px;
    text-shadow: 0px 1px 0 white
}

div.body h1 { border-top: 20px solid white; margin-top: 0; font-size: 200%; }
div.body h2 { font-size: 150%; background-color: #C8D5E3; }
div.body h3 { font-size: 120%; background-color: #D8DEE3; }
div.body h4 { font-size: 110%; background-color: #D8DEE3; }
div.body h5 { font-size: 100%; background-color: #D8DEE3; }
div.body h6 { font-size: 100%; background-color: #D8DEE3; }

a.headerlink {
    color: #c60f0f;
    font-size: 0.8em;
    padding: 0 4px 0 4px;
    text-decoration: none;
}

a.headerlink:hover {
    background-color: #c60f0f;
    color: white;
}

div.body p, div.body dd, div.body li {
    line-height: 1.5em;
}

div.admonition p.admonition-title + p {
    display: inline;
}

div.highlight{
    background-color: white;
}

div.note {
    background-color: #eee;
    border: 1px solid #ccc;
}

div.seealso {
    background-color: #ffc;
    border: 1px solid #ff6;
}

div.topic {
    background-color: #eee;
}

div.warning {
    background-color: #ffe4e4;
    border: 1px solid #f66;
}

p.admonition-title {
    display: inline;
}

p.admonition-title:after {
    content: ":";
}

pre {
    padding: 10px;
    background-color: White;
    color: #222;
    line-height: 1.2em;
    border: 1px solid #C6C9CB;
    font-size: 1.2em;
    margin: 1.5em 0 1.5em 0;
    box-shadow: 1px 1px 1px #d8d8d8;
}

tt {
    background-color: #ecf0f3;
    color: #222;
    padding: 1px 2px;
    font-size: 1.2em;
    font-family: monospace;
}