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Mads Kiilerich

ishell: specify ipython minimum version 4

`gearbox ishell` has an "optional" dependency on ipython as it fails with:
Kallithea ishell requires the IPython Python package
Before the previous change, after installing ipython < 4, it would however
still fail the same way.
With the previous change, it would fail in a slightly more helpful way with:
ImportError: No module named traitlets.config.loader

With ipython < 4, after installing the missing traitlets (4.3.2) as hinted,
ishell still failed with:
TraitError: The 'config' trait of an InteractiveShellEmbed instance must be a Config or None, but a value of class 'traitlets.config.loader.Config' (i.e. {'InteractiveShellEmbed': {'confirm_exit': False}}) was specified.

With ipython >= 4, traitlets is installed as dependency, and ishell works.
Tested with both ipython 4.0 and current latest version 5.8 .

Thus, just clarify that we only support ipython >= 4 .

# 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/gearbox celeryd -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