Replace supervisord with s6-overlay

Also restructure container to have all the container relevant files in
container-root to minimize the amount of COPY instructions and to make
the file structure more organized.

Dockerfiles/rtorrent/Dockerfile

@@ -1,10 +1,15 @@
 FROM buildpack-deps:xenial-scm
 MAINTAINER Kelvin Chen <kelvin@kelvinchen.org>
 
+# For rtorrent
+ENV TERM=xterm
+
 # Install dependencies
-RUN apt-get update \
+RUN curl -sL "https://github.com/just-containers/s6-overlay/releases/download/v1.18.1.5/s6-overlay-amd64.tar.gz" \
+        | tar xz -C / \
+    && apt-get update \
     && apt-get install -y \
-        supervisor \
+        screen \
         rtorrent \
         mediainfo \
         php7.0-fpm \
@@ -28,8 +33,6 @@ VOLUME /config /torrents
 
 EXPOSE 80 49161 49161/udp 6881/udp
 
-COPY init rtorrent.rc supervisord.conf /
-COPY nginx.conf /etc/nginx/nginx.conf
-COPY rutorrent_config.php /opt/rutorrent/conf/config.php
+COPY container-root/ /
 
 CMD ["/init"]

Dockerfiles/rtorrent/container-root/etc/cont-init.d/10-setup

@@ -1,16 +1,11 @@
-#!/usr/bin/env bash
+#!/usr/bin/with-contenv sh
 
 # Make rtorrent session directory
 mkdir -p /config/rtorrent
 
 # Add default config if it does not exist
-cp -n /rtorrent.rc /config/rtorrent/rtorrent.rc
-
-# Remove rtorrent lock file if it exists so rtorrent can start
-rm -f /config/rtorrent/rtorrent.lock
+cp -n /etc/defaults/rtorrent.rc /config/rtorrent/rtorrent.rc
 
 # Make folders for storing rutorrent data
 mkdir -p /config/rutorrent/settings /config/rutorrent/torrents \
     /config/rutorrent/users /config/rutorrent/plugins
-
-exec supervisord -c /supervisord.conf

Dockerfiles/rtorrent/container-root/etc/services.d/nginx/run

@@ -0,0 +1,3 @@
+#!/usr/bin/with-contenv sh
+
+exec nginx -g "daemon off;"

Dockerfiles/rtorrent/container-root/etc/services.d/php/run

@@ -0,0 +1,3 @@
+#!/usr/bin/with-contenv sh
+
+exec php-fpm7.0 -F -R

Dockerfiles/rtorrent/container-root/etc/services.d/rtorrent/finish

@@ -0,0 +1,4 @@
+#!/usr/bin/with-contenv sh
+
+# Make sure lock file is removed after end
+rm -f /config/rtorrent/rtorrent.lock

Dockerfiles/rtorrent/container-root/etc/services.d/rtorrent/run

@@ -0,0 +1,6 @@
+#!/usr/bin/with-contenv sh
+
+# Remove rtorrent lock file if it exists so rtorrent can start
+rm -f /config/rtorrent/rtorrent.lock
+
+exec screen -D -m -S rtorrent rtorrent

Dockerfiles/rtorrent/supervisord.conf

@@ -1,20 +0,0 @@
-; vim: ft=dosini
-
-[supervisord]
-nodaemon = true
-
-[program:rtorrent]
-priority = 1
-environment = TERM=xterm
-command = rtorrent
-autorestart = true
-
-[program:php]
-priority = 2
-command = php-fpm7.0 -F -R
-autorestart = true
-
-[program:nginx]
-priority = 3
-command = nginx -g "daemon off;"
-autorestart = true