Adding Dockerfile with support files to build a minimal docker image running i2p.

Docker.entrypoint.sh

+#!/bin/sh
+
+export JAVA_HOME=/opt/jdk/jre
+
+# Ensure user rights
+chown -R i2p:nobody /opt/i2p
+chmod -R u+rwx /opt/i2p
+
+gosu i2p /opt/i2p/i2psvc /opt/i2p/wrapper.config wrapper.pidfile=/var/tmp/i2p.pid \
+   wrapper.name=i2p \
+   wrapper.displayname="I2P Service" \
+   wrapper.statusfile=/var/tmp/i2p.status \
+   wrapper.java.statusfile=/var/tmp/i2p.java.status \
+   wrapper.logfile=/var/tmp/wrapper.log

Docker.expt

+#!/usr/bin/expect
+set timeout 15;
+spawn java -jar /tmp/i2pinstall.jar -console
+expect {
+ -re ".*press 1 to continue, 2 to quit, 3 to redisplay" {send "1\r"; exp_continue;}
+ -re "Select target path *" {send "/opt/i2p\r"; exp_continue;}
+}

Dockerfile

+FROM meeh/java8server:latest
+# Docker image based on Alpine with Java.
+
+# We use Oracle Java to run I2P, but uses the openjdk to build it.
+
+
+MAINTAINER Mikal Villa <mikal@sigterm.no>
+
+ENV GIT_BRANCH="master"
+ENV I2P_PREFIX="/opt/i2p"
+ENV PATH=${I2P_PREFIX}/bin:$PATH
+ENV JAVA_HOME=/usr/lib/jvm/default-jvm
+
+ENV GOSU_VERSION=1.7
+ENV GOSU_SHASUM="34049cfc713e8b74b90d6de49690fa601dc040021980812b2f1f691534be8a50  /usr/local/bin/gosu"
+
+RUN mkdir /user && adduser -S -h /user i2p && chown -R i2p:nobody /user
+
+# Adding files first, since Docker.expt is required for installation
+ADD Docker.expt /tmp/Docker.expt
+ADD Docker.entrypoint.sh /entrypoint.sh
+
+# Required for wget https
+RUN apk add --no-cache openssl
+# Gosu is a replacement for su/sudo in docker and not a backdoor :) See https://github.com/tianon/gosu
+RUN wget -O /usr/local/bin/gosu https://github.com/tianon/gosu/releases/download/${GOSU_VERSION}/gosu-amd64 \
+    && echo "${GOSU_SHASUM}" | sha256sum -c && chmod +x /usr/local/bin/gosu
+
+#
+# Each RUN is a layer, adding the dependencies and building i2pd in one layer takes around 8-900Mb, so to keep the
+# image under 200mb we need to remove all the build dependencies in the same "RUN" / layer.
+#
+
+# The main layer
+RUN apk --no-cache add build-base git gettext tar bzip2 apache-ant openjdk8 expect \
+    && mkdir -p /usr/src/build \
+    && cd /usr/src/build \
+    && git clone -b ${GIT_BRANCH} https://github.com/i2p/i2p.i2p.git \
+    && cd /usr/src/build/i2p.i2p \
+    && echo "noExe=true" >> build.properties \
+    && ant installer-linux \
+    && cp i2pinstall*.jar /tmp/i2pinstall.jar \
+    && mkdir -p /opt \
+    && chown i2p:root /opt \
+    && chmod u+rw /opt \
+    && gosu i2p expect -f /tmp/Docker.expt \
+    && cd ${I2P_PREFIX} \
+    && rm -fr man docs *.bat *.command *.app /tmp/i2pinstall.jar /tmp/Docker.expt \
+    && rm -fr /usr/src/build \
+    && apk --purge del build-base apache-ant expect tcl expat git openjdk8 openjdk8-jre openjdk8-jre-base openjdk8-jre-lib bzip2 tar \
+      binutils-libs binutils pkgconfig libcurl libc-dev musl-dev g++ make fortify-headers pkgconf giflib libssh2 libxdmcp libxcb \
+      libx11 pcre alsa-lib libxi libxrender libxml2 readline bash openssl \
+    && rm -fr /usr/lib/jvm/default-jre \
+    && ln -sf /opt/jdk/jre /usr/lib/jvm/default-jre \
+    && chmod a+x /entrypoint.sh
+
+
+
+EXPOSE 7654 7656 7657 7658 4444 6668 8998 7659 7660 4445 15000-20000
+
+ENTRYPOINT [ "/entrypoint.sh" ]
+

README.md

+Just to trigger automatic builds of docker image.
+
+Sorry for the mess in the root directory.
+
+TODO: Change content :)
+
+(hub.docker.io requires a Dockerfile + README.md in root, to build from a repo)
+