commit 7214ce27662ea05cb4f001f4d634a7828b1cd4d2
Author: Maksym Bordun <maksym.bordun@ynd.co>
Date:   Fri Aug 21 16:08:41 2020 +0200

    Add initial templates and Dockerfile generator

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..71686ab
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+alpine/
+centos/
diff --git a/Dockerfile.alpine.template b/Dockerfile.alpine.template
new file mode 100644
index 0000000..1dcac69
--- /dev/null
+++ b/Dockerfile.alpine.template
@@ -0,0 +1,148 @@
+FROM alpine:{DISTRO_VERSION}
+
+RUN apk add --no-cache \
+		gmp-dev
+
+# skip installing gem documentation
+RUN set -eux; \
+	mkdir -p /usr/local/etc; \
+	{ \
+		echo 'install: --no-document'; \
+		echo 'update: --no-document'; \
+	} >> /usr/local/etc/gemrc
+
+ENV LANG C.UTF-8
+
+# 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
+# readline-dev vs libedit-dev: https://bugs.ruby-lang.org/issues/11869 and https://github.com/docker-library/ruby/issues/75
+RUN set -eux; \
+	\
+	apk add --no-cache --virtual .ruby-builddeps \
+		autoconf \
+		bison \
+		bzip2 \
+		bzip2-dev \
+		ca-certificates \
+		coreutils \
+		dpkg-dev dpkg \
+		gcc \
+		gdbm-dev \
+		glib-dev \
+		libc-dev \
+		libffi-dev \
+		libxml2-dev \
+		libxslt-dev \
+		linux-headers \
+		make \
+		ncurses-dev \
+		openssl \
+		openssl-dev \
+		patch \
+		procps \
+		readline-dev \
+		ruby \
+		tar \
+		xz \
+		yaml-dev \
+		zlib-dev \
+	; \
+	\
+	wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/{RUBY_MAJOR}/ruby-{RUBY_VERSION}.tar.xz"; \
+	\
+	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; \
+	\
+# https://github.com/docker-library/ruby/issues/196
+# https://bugs.ruby-lang.org/issues/14387#note-13 (patch source)
+# https://bugs.ruby-lang.org/issues/14387#note-16 ("Therefore ncopa's patch looks good for me in general." -- only breaks glibc which doesn't matter here)
+	wget -O 'thread-stack-fix.patch' 'https://bugs.ruby-lang.org/attachments/download/7081/0001-thread_pthread.c-make-get_main_stack-portable-on-lin.patch'; \
+	echo '3ab628a51d92fdf0d2b5835e93564857aea73e0c1de00313864a94a6255cb645 *thread-stack-fix.patch' | sha256sum --check --strict; \
+	patch -p1 -i thread-stack-fix.patch; \
+	rm thread-stack-fix.patch; \
+	\
+# 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="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)"; \
+# the configure script does not detect isnan/isinf as macros
+	export ac_cv_func_isnan=yes ac_cv_func_isinf=yes; \
+	./configure \
+		--build="$gnuArch" \
+		--disable-install-doc \
+		--enable-shared \
+	; \
+	make -j "$(nproc)"; \
+	make install; \
+	\
+	runDeps="$( \
+		scanelf --needed --nobanner --format '%n#p' --recursive /usr/local \
+			| tr ',' '\n' \
+			| sort -u \
+			| awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
+	)"; \
+	apk add --no-network --virtual .ruby-rundeps \
+		$runDeps \
+		bzip2 \
+		ca-certificates \
+		libffi-dev \
+		procps \
+		yaml-dev \
+		zlib-dev \
+	; \
+	apk del --no-network .ruby-builddeps; \
+	\
+	cd /; \
+	rm -r /usr/src/ruby; \
+# verify we have no "ruby" packages installed
+	! apk --no-network list --installed \
+		| grep -v '^[.]ruby-rundeps' \
+		| grep -i ruby \
+	; \
+	[ "$(command -v ruby)" = '/usr/local/bin/ruby' ]; \
+# rough smoke test
+	ruby --version; \
+	gem --version; \
+	bundle --version
+
+# don't create ".bundle" in all our apps
+ENV GEM_HOME /usr/local/bundle
+ENV BUNDLE_SILENCE_ROOT_WARNING=1 \
+	BUNDLE_APP_CONFIG="$GEM_HOME"
+ENV PATH $GEM_HOME/bin:$PATH
+# adjust permissions of a few directories for running "gem install" as an arbitrary user
+RUN mkdir -p "$GEM_HOME" && chmod 777 "$GEM_HOME"
+
+# Packages installed to the 'world' and used in applications
+RUN apk -q --update --no-cache add \
+  bc \
+  build-base \
+  less \
+  git \
+  openssh \
+  bash \
+  curl \
+  curl-dev \
+  jq \
+  netcat-openbsd \
+  postgresql-client \
+  postgresql-dev \
+  libxml2 \
+  libxml2-dev \
+  libxslt \
+  libxslt-dev \
+  nodejs \
+  graphviz \
+  yarn
+
+CMD [ "irb" ]
diff --git a/Dockerfile.centos.template b/Dockerfile.centos.template
new file mode 100644
index 0000000..0d1d940
--- /dev/null
+++ b/Dockerfile.centos.template
@@ -0,0 +1,40 @@
+FROM centos:{DISTRO_VERSION}
+
+RUN yum install -q -y \
+	https://yum.postgresql.org/11/redhat/rhel-{DISTRO_VERSION}-x86_64/pgdg-redhat-repo-latest.noarch.rpm \
+	epel-release
+
+# Install basic deps
+RUN yum install -q -y \
+  bash \
+  bc \
+  cups \
+  curl \
+  curl \
+  epel-release \
+  fontconfig \
+  git \
+  git-core \
+  graphviz \
+  jq \
+  less \
+  nc \
+  openssl \
+  postgresql11-11.7 \
+  postgresql11-devel-11.7 \
+  postgresql11-libs-11.7 \
+  ImageMagick ImageMagick-devel \
+  vim \
+  wget \
+  zip unzip \
+  xorg-x11-fonts-75dpi \
+  xorg-x11-fonts-Type1 && \
+  yum clean all
+
+# Install specific Ruby version via RVM and set it as default
+RUN curl -sSL https://rvm.io/mpapis.asc | gpg --import - && \
+    curl -sSL https://rvm.io/pkuczynski.asc | gpg --import - && \
+    curl -sSL https://get.rvm.io | bash -s stable && \
+    bash -lc 'rvm install {RUBY_VERSION};rvm alias create default {RUBY_VERSION}' && \
+    ruby --version; \
+  	gem --version
diff --git a/hooks/pre_build b/hooks/pre_build
new file mode 100755
index 0000000..097032d
--- /dev/null
+++ b/hooks/pre_build
@@ -0,0 +1,24 @@
+#!/bin/bash
+# Script is used to generate all the necessary Dockerfiles based on the templates
+
+declare -a ruby_versions=("2.5.3" "2.6.2" "2.6.3" "2.6.5")
+declare -a distributions=("alpine:3.12" "centos:7")
+
+for i in "${distributions[@]}"
+do
+  DISTRO_NAME="$(cut -d ':' -f1 <<< $i)"
+  DISTRO_VERSION="$(cut -d ':' -f2 <<< $i)"
+
+  for j in "${ruby_versions[@]}"
+  do
+    # E.g. ./alpine/3.11/2.5.3
+    TARGET_DIR="./$DISTRO_NAME/$DISTRO_VERSION/$j"
+    RUBY_MAJOR="$(echo $j | grep --only-matching -E '[[:digit:]]+\.[[:digit:]]+')"
+    mkdir --parents $TARGET_DIR
+    cp ./Dockerfile.$DISTRO_NAME.template $TARGET_DIR/Dockerfile
+
+    sed -i "s/{RUBY_VERSION}/$j/g" $TARGET_DIR/Dockerfile
+    sed -i "s/{RUBY_MAJOR}/$RUBY_MAJOR/g" $TARGET_DIR/Dockerfile
+    sed -i "s/{DISTRO_VERSION}/$DISTRO_VERSION/g" $TARGET_DIR/Dockerfile
+  done
+done