matrix-synapse-py3.preinst

#!/bin/sh -e

# Attempt to undo some of the braindamage caused by
# https://github.com/matrix-org/package-synapse-debian/issues/18.
#
# Due to reasons [1], the old python2 matrix-synapse package will not stop the
# service when the package is uninstalled. Our maintainer scripts will do the
# right thing in terms of ensuring the service is enabled and unmasked, but
# then do a `systemctl start matrix-synapse`, which of course does nothing -
# leaving the old (py2) service running.
#
# There should normally be no reason for the service to be running during our
# preinst, so we assume that if it *is* running, it's due to that situation,
# and stop it.
#
# [1] dh_systemd_start doesn't do anything because it sees that there is an
#     init.d script with the same name, so leaves it to dh_installinit.
#
#     dh_installinit doesn't do anything because somebody gave it a --no-start
#     for unknown reasons.

if [ -x /bin/systemctl ]; then
    if /bin/systemctl --quiet is-active -- matrix-synapse; then
        echo >&2 "stopping existing matrix-synapse service"
        /bin/systemctl stop matrix-synapse || true
    fi
fi

#DEBHELPER#

exit 0