matrix-docker-ansible-deploy/roles/matrix-server/templates/usr-local-bin/matrix-synapse-register-user.j2

#!/bin/bash

if [ $# -ne 3 ]; then
        echo "Usage: "$0" <username> <password> <admin access: 0 or 1>"
        exit 1
fi

user=$1
password=$2
admin=$3

if [ "$admin" -eq "1" ]; then
        docker exec matrix-synapse register_new_matrix_user -a -u $user -p $password -c /data/homeserver.yaml https://localhost:8448
else
        # If `-a` is not passed, we need to answer to an "admin: yes/no" question
        echo 'no' | docker exec -i matrix-synapse register_new_matrix_user -u $user -p $password $extraFlags -c /data/homeserver.yaml https://localhost:8448
fi