docker: Add a docker quick-start directory

diff --git a/docker/Dockerfile b/docker/Dockerfile
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+++ b/docker/Dockerfile
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+FROM ubuntu:18.04
+
+ENV DEBIAN_FRONTEND noninteractive
+
+# Install tools and dependencies
+RUN apt-get update && \
+    apt-get -y install --no-install-recommends \
+      ca-certificates \
+      libsasl2-modules \
+      git \
+      automake \
+      autopoint \
+      autoconf \
+      texinfo \
+      libtool \
+      libltdl-dev \
+      libgpg-error-dev \
+      libidn11-dev \
+      libunistring-dev \
+      libglpk-dev \
+      libbluetooth-dev \
+      libextractor-dev \
+      libmicrohttpd-dev \
+      libgnutls28-dev \
+      libgcrypt20-dev \
+      libpq-dev \
+      libsqlite3-dev && \
+    apt-get clean all && \
+    apt-get -y autoremove && \
+    rm -rf \
+      /var/lib/apt/lists/* \
+      /tmp/*
+
+# Install GNUrl
+ENV GNURL_GIT_URL https://git.taler.net/gnurl.git
+ENV GNURL_GIT_BRANCH gnurl-7.57.0
+
+RUN git clone $GNURL_GIT_URL \
+      --branch $GNURL_GIT_BRANCH \
+      --depth=1 \
+      --quiet && \
+    cd /gnurl && \
+      autoreconf -i && \
+      ./configure \
+        --enable-ipv6 \
+        --with-gnutls \
+        --without-libssh2 \
+        --without-libmetalink \
+        --without-winidn \
+        --without-librtmp \
+        --without-nghttp2 \
+        --without-nss \
+        --without-cyassl \
+        --without-polarssl \
+        --without-ssl \
+        --without-winssl \
+        --without-darwinssl \
+        --disable-sspi \
+        --disable-ntlm-wb \
+        --disable-ldap \
+        --disable-rtsp \
+        --disable-dict \
+        --disable-telnet \
+        --disable-tftp \
+        --disable-pop3 \
+        --disable-imap \
+        --disable-smtp \
+        --disable-gopher \
+        --disable-file \
+        --disable-ftp \
+        --disable-smb && \
+      make install && \
+    cd - && \
+    rm -fr /gnurl
+
+# Install GNUnet
+ENV GNUNET_PREFIX /usr/local/gnunet
+ENV CFLAGS '-g -Wall -O0'
+
+COPY ../ /gnunet
+
+RUN cd /gnunet && \
+      ./bootstrap && \
+      ./configure \
+        --with-nssdir=/lib \
+        --prefix="$GNUNET_PREFIX" \
+        --enable-logging=verbose && \
+      make -j3 && \
+      make install && \
+      ldconfig && \
+    cd - && \
+    rm -fr /gnunet
+
+# Configure GNUnet
+COPY gnunet.conf /etc/gnunet.conf
+COPY docker-entrypoint.sh /usr/local/bin/docker-entrypoint
+RUN chmod 755 /usr/local/bin/docker-entrypoint
+
+ENV LOCAL_PORT_RANGE='40001 40200'
+ENV PATH "$GNUNET_PREFIX/bin:/usr/local/bin:$PATH"
+
+ENTRYPOINT ["docker-entrypoint"]

diff --git a/docker/README.md b/docker/README.md
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index 0000000..4e0e6b9
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+++ b/docker/README.md
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+# gnunet-docker
+A Dockerfile (and maybe later docker-compose.yml) for getting a running GNUnet docker container.
+
+> This README and parts of the Dockerfile were adapted from https://github.com/compiaffe/gnunet-docker
+
+
+## Build it
+This will take quite a while and will consume a bit of data.
+
+```bash
+docker build -t gnunet .
+```
+
+## Start it from the newly created gnunet image
+Start a container from `gnunet` image, which can access /dev/net/tun, has access to the host network. We are going to name it `gnunet1`.
+
+Note the `--rm` that will delete the container as soon as you stop it and `-ti` gives you an interactive terminal.
+
+#### Linux Users
+```bash
+docker run \
+  --rm \
+  -ti \
+  --privileged \
+  --name gnunet1 \
+  --net=host \
+  -v /dev/net/tun:/dev/net/tun \
+  gnunet
+```
+
+#### Mac Users
+```bash
+docker run \
+  --rm \
+  -it \
+  --privileged \
+  --name gnunet1 \
+  -e LOCAL_PORT_RANGE='40001 40200' \
+  -e GNUNET_PORT=2086 \
+  -p 2086:2086 \
+  -p 2086:2086/udp \
+  -p40001-40200:40001-40200 \
+  -p40001-40200:40001-40200/udp \
+  gnunet
+```
+
+This terminal will keep on printing to screen at the moment. So go on in a new terminal please.
+
+Don't worry about warnings too much...
+
+## Check if you are connected
+Open a new terminal and connect to the container we just started:
+
+```bash
+docker exec -it gnunet1 gnunet-peerinfo -i
+```
+
+If you get a list of peers, all is good.
+
+## Multiple containers on the same host
+### Running
+#### Run Container 1
+```bash
+export GPORT=2086 LPORT='40001-40200' GNAME=gnunet1
+docker run \
+  --rm \
+  -it \
+  --privileged \
+  -e GNUNET_PORT=$GPORT \
+  -e LOCAL_PORT_RANGE="${LPORT/-/ }" \
+  -p $GPORT:$GPORT \
+  -p $GPORT:$GPORT/udp \
+  -p$LPORT:$LPORT \
+  -p$LPORT:$LPORT/udp \
+  --name $GNAME \
+  gnunet
+```
+
+#### Run Container 2
+```bash
+export GPORT=2087 LPORT='40201-40400' GNAME=gnunet2
+docker run \
+  --rm \
+  -it \
+  --privileged \
+  -e GNUNET_PORT=$GPORT \
+  -e LOCAL_PORT_RANGE="${LPORT/-/ }" \
+  -p $GPORT:$GPORT \
+  -p $GPORT:$GPORT/udp \
+  -p$LPORT:$LPORT \
+  -p$LPORT:$LPORT/udp \
+  --name $GNAME \
+  gnunet
+```
+
+### Testing cadet example
+#### Container 1
+```bash
+$ docker exec -it gnunet1 bash
+$ gnunet-peerinfo -s
+I am peer `VWPN1NZA6YMM866EJ5J2NY47XG692MQ6H6WASVECF0M18A9SCMZ0'.
+$ gnunet-cadet -o asdasd
+```
+
+#### Container 2
+```bash
+$ docker exec -it gnunet2 bash
+$ gnunet-cadet VWPN1NZA6YMM866EJ5J2NY47XG692MQ6H6WASVECF0M18A9SCMZ0 asdasd
+```
+
+### Testing file sharing example
+#### Container 1
+```bash
+$ docker exec -it gnunet1 bash
+$ echo 'test' > test.txt
+$ gnunet-publish test.txt
+Publishing `/test.txt' done.
+URI is `gnunet://fs/chk/1RZ7A8TAQHMF8DWAGTSZ9CSA365T60C4BC6DDS810VM78D2Q0366CRX8DGFA29EWBT9BW5Y9HYD0Z1EAKNFNJQDJ04QQSGTQ352W28R.7MYB03GYXT17Z93ZRZRVV64AH9KPWFSVDEZGVE84YHD63XZFJ36B86M48KHTZVF87SZ05HBVB44PCXE8CVWAH72VN1SKYPRK1QN2C98.5'.
+```
+
+#### Container 2
+```bash
+$ docker exec -it gnunet2 bash
+$ gnunet-download -o out.file "gnunet://fs/chk/1RZ7A8TAQHMF8DWAGTSZ9CSA365T60C4BC6DDS810VM78D2Q0366CRX8DGFA29EWBT9BW5Y9HYD0Z1EAKNFNJQDJ04QQSGTQ352W28R.7MYB03GYXT17Z93ZRZRVV64AH9KPWFSVDEZGVE84YHD63XZFJ36B86M48KHTZVF87SZ05HBVB44PCXE8CVWAH72VN1SKYPRK1QN2C98.5"
+100% [============================================================]
+Downloading `out.file' done (0 b/s).
+$ cat out.file
+test
+```
+

diff --git a/docker/docker-entrypoint.sh b/docker/docker-entrypoint.sh
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+++ b/docker/docker-entrypoint.sh
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+#!/bin/bash -e
+
+echo "${LOCAL_PORT_RANGE:-49152 65535}" > /proc/sys/net/ipv4/ip_local_port_range
+sed -i 's/$GNUNET_PORT/'${GNUNET_PORT:-2086}'/g' /etc/gnunet.conf
+
+if [[ $# -eq 0 ]]; then
+  exec gnunet-arm \
+    --config=/etc/gnunet.conf \
+    --start \
+    --monitor
+elif [[ -z $1 ]] || [[ ${1:0:1} == '-' ]]; then
+  exec gnunet-arm "$@"
+else
+  exec "$@"
+fi

diff --git a/docker/gnunet.conf b/docker/gnunet.conf
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index 0000000..c8299ef
--- /dev/null
+++ b/docker/gnunet.conf
@@ -0,0 +1,21 @@
+[arm]
+SYSTEM_ONLY = NO
+USER_ONLY = NO
+
+[fs]
+FORCESTART = NO
+
+[nat]
+ENABLE_UPNP = NO
+BEHIND_NAT = YES
+
+[transport-tcp]
+PORT = $GNUNET_PORT
+ADVERTISED_PORT = $GNUNET_PORT
+
+[transport-udp]
+PORT = $GNUNET_PORT
+BROADCAST = YES
+
+[cadet]
+TESTING_IGNORE_KEYS = ACCEPT_FROM;