docker-mastodon/rootfs/usr/local/bin/run

#!/bin/sh

echo "
---------------------------------------------
     _____         _         _
    |     |___ ___| |_ ___ _| |___ ___
    | | | | .'|_ -|  _| . | . | . |   |
    |_|_|_|__,|___|_| |___|___|___|_|_|

A GNU Social-compatible microblogging server
   https://github.com/tootsuite/mastodon
---------------------------------------------
UID/GID settings
---------------------------------------------
User  ID : ${UID}
Group ID : ${GID}
---------------------------------------------
Logs location
---------------------------------------------
Sidekiq   : /mastodon/log/sidekiq.log
Streaming : /mastodon/log/streaming.log
Web       : /mastodon/log/web.log
---------------------------------------------
"

echo "Creating mastodon user..."
addgroup -g ${GID} mastodon &>/dev/null
adduser -h /mastodon -s /bin/sh -D -G mastodon -u ${UID} mastodon &>/dev/null

echo "Updating permissions, this can take a while..."
find /mastodon -path /mastodon/public/system -prune -o -print0 | xargs -0 chown -f mastodon:mastodon
chown -R mastodon:mastodon /etc/s6.d

if [ "$RUN_DB_MIGRATIONS" == "true" ]; then
  echo "Running database migrations task..."
  su-exec mastodon:mastodon bundle exec rake db:migrate
fi

echo "Executing process(es)..."
if [ '$@' == '' ]; then
    exec su-exec mastodon:mastodon /bin/s6-svscan /etc/s6.d
else
    exec su-exec mastodon:mastodon "$@"
fi