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Location: kallithea/init.d/celeryd-upstart.conf - annotation

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.
# celeryd - run the celeryd daemon as an upstart job for kallithea
# Change variables/paths as necessary and place file /etc/init/celeryd.conf
# start/stop/restart as normal upstart job (ie: $ start celeryd)

description     "Celery for Kallithea Mercurial Server"
author          "Matt Zuba <matt.zuba@goodwillaz.org"

start on starting kallithea
stop on stopped kallithea

respawn

umask 0022

env PIDFILE=/tmp/celeryd.pid
env APPINI=/var/hg/kallithea/production.ini
env HOME=/var/hg
env USER=hg
# To use group (if different from user), you must edit sudoers file and change
# root's entry from (ALL) to (ALL:ALL)
# env GROUP=hg

script
    COMMAND="/var/hg/.virtualenvs/kallithea/bin/kallithea-cli celery-run -c $APPINI -- --pidfile=$PIDFILE"
    if [ -z "$GROUP" ]; then
        exec sudo -u $USER $COMMAND
    else
        exec sudo -u $USER -g $GROUP $COMMAND
    fi
end script

post-stop script
    rm -f $PIDFILE
end script