[WIP] Compile jessie-slim with jemalloc

2.4/jessie/slim-jemalloc/Dockerfile

@@ -0,0 +1,108 @@
+FROM debian:jessie
+
+RUN apt-get update \
+	&& apt-get install -y --no-install-recommends \
+		bzip2 \
+		ca-certificates \
+    curl \
+		libffi-dev \
+		libgdbm3 \
+		libssl-dev \
+		libyaml-dev \
+		procps \
+		zlib1g-dev \
+    libjemalloc-dev \
+	&& rm -rf /var/lib/apt/lists/*
+
+# skip installing gem documentation
+RUN mkdir -p /usr/local/etc \
+	&& { \
+		echo 'install: --no-document'; \
+		echo 'update: --no-document'; \
+	} >> /usr/local/etc/gemrc
+
+ENV RUBY_MAJOR 2.4
+ENV RUBY_VERSION 2.4.2
+ENV RUBY_DOWNLOAD_SHA256 748a8980d30141bd1a4124e11745bb105b436fb1890826e0d2b9ea31af27f735
+ENV RUBYGEMS_VERSION 2.7.6
+ENV BUNDLER_VERSION 1.16.1
+
+# some of ruby's build scripts are written in ruby
+#   we purge system ruby later to make sure our final image uses what we just built
+RUN set -ex \
+	\
+	&& buildDeps=' \
+		autoconf \
+		bison \
+		dpkg-dev \
+		gcc \
+		libbz2-dev \
+		libgdbm-dev \
+		libglib2.0-dev \
+		libncurses-dev \
+		libreadline-dev \
+		libxml2-dev \
+		libxslt-dev \
+		make \
+		ruby \
+		wget \
+		xz-utils \
+	' \
+	&& apt-get update \
+	&& apt-get install -y --no-install-recommends $buildDeps \
+	&& rm -rf /var/lib/apt/lists/* \
+	\
+	&& wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
+	&& echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.xz" | sha256sum -c - \
+	\
+	&& mkdir -p /usr/src/ruby \
+	&& tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1 \
+	&& rm ruby.tar.xz \
+	\
+	&& cd /usr/src/ruby \
+	\
+# hack in "ENABLE_PATH_CHECK" disabling to suppress:
+#   warning: Insecure world writable dir
+	&& { \
+		echo '#define ENABLE_PATH_CHECK 0'; \
+		echo; \
+		cat file.c; \
+	} > file.c.new \
+	&& mv file.c.new file.c \
+	\
+	&& autoconf \
+	&& gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" \
+	&& ./configure \
+		--build="$gnuArch" \
+    --with-jemalloc \
+		--disable-install-doc \
+		--enable-shared \
+	&& make -j "$(nproc)" \
+	&& make install \
+	\
+	&& dpkg-query --show --showformat '${package}\n' \
+		| grep -P '^libreadline\d+$' \
+		| xargs apt-mark manual \
+	&& apt-get purge -y --auto-remove $buildDeps \
+	&& cd / \
+	&& rm -r /usr/src/ruby \
+	\
+	&& gem update --system "$RUBYGEMS_VERSION" \
+	&& gem install bundler --version "$BUNDLER_VERSION" --force \
+	&& rm -r /root/.gem/
+
+# Debugging output to ensure that libjemalloc is present and used
+RUN ruby -r rbconfig -e "RbConfig::CONFIG['LIBS'].include?('jemalloc') ? puts('Ruby is compiled with jemalloc') : warn('JEMALLOC IS MISSING FROM RUBY')"
+
+# install things globally, for great justice
+# and don't create ".bundle" in all our apps
+ENV GEM_HOME /usr/local/bundle
+ENV BUNDLE_PATH="$GEM_HOME" \
+	BUNDLE_BIN="$GEM_HOME/bin" \
+	BUNDLE_SILENCE_ROOT_WARNING=1 \
+	BUNDLE_APP_CONFIG="$GEM_HOME"
+ENV PATH $BUNDLE_BIN:$PATH
+RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
+	&& chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
+
+CMD [ "irb" ]