Dockerfile.template

{{
	def is_alpine:
		env.variant | startswith("alpine")
	;
	def is_slim:
		env.variant | startswith("slim-")
	;
	def clean_apt:
		# TODO once bookworm is EOL, remove this and just hard-code "apt-get dist-clean" instead
		if env.variant | contains("bookworm") then
			"rm -rf /var/lib/apt/lists/*"
		else "apt-get dist-clean" end
-}}
{{ if is_alpine then ( -}}
FROM alpine:{{ env.variant | ltrimstr("alpine") }}
{{ ) elif is_slim then ( -}}
FROM debian:{{ env.variant | ltrimstr("slim-") }}-slim
{{ ) else ( -}}
FROM buildpack-deps:{{ env.variant }}
{{ ) end -}}

{{ if is_slim then ( -}}
RUN set -eux; \
	apt-get update; \
	apt-get install -y --no-install-recommends \
		ca-certificates \
	; \
	{{ clean_apt }}

{{ ) else "" end -}}
# skip installing gem documentation with `gem install`/`gem update`
RUN set -eux; \
	mkdir -p /usr/local/etc; \
	echo 'gem: --no-document' >> /usr/local/etc/gemrc

ENV LANG C.UTF-8

# https://www.ruby-lang.org/{{ .post | ltrimstr("/") }}
ENV RUBY_VERSION {{ .version }}
ENV RUBY_DOWNLOAD_URL {{ .url.xz }}
ENV RUBY_DOWNLOAD_SHA256 {{ .sha256.xz }}

# 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 -eux; \
	\
{{ if is_alpine then ( -}}
	apk add --no-cache --virtual .ruby-builddeps \
		autoconf \
		bzip2 \
		bzip2-dev \
		ca-certificates \
		coreutils \
		dpkg-dev dpkg \
		g++ \
		gcc \
		gdbm-dev \
		glib-dev \
		gmp-dev \
		libc-dev \
		libffi-dev \
		libxml2-dev \
		libxslt-dev \
		linux-headers \
		make \
		ncurses-dev \
		openssl \
		openssl-dev \
		patch \
		procps \
		yaml-dev \
		zlib-dev \
		ruby \
		tar \
		xz \
		yaml-dev \
		zlib-dev \
	; \
{{ ) else ( -}}
	savedAptMark="$(apt-mark showmanual)"; \
	apt-get update; \
	apt-get install -y --no-install-recommends \
		dpkg-dev \
		libgdbm-dev \
		ruby \
{{ if is_slim then ( -}}
		autoconf \
		bzip2 \
		g++ \
		gcc \
		libbz2-dev \
		libffi-dev \
		libgdbm-compat-dev \
		libglib2.0-dev \
		libgmp-dev \
		libncurses-dev \
		libssl-dev \
		libxml2-dev \
		libxslt-dev \
		libyaml-dev \
		make \
		wget \
		xz-utils \
		zlib1g-dev \
{{ ) else "" end -}}
	; \
{{ ) end -}}
	\
	rustArch=; \
{{ def archVar: if is_alpine then "apkArch" else "dpkgArch" end -}}
	{{ archVar }}="$({{ if is_alpine then "apk --print-arch" else "dpkg --print-architecture" end }})"; \
	case "${{ archVar }}" in \
{{
	(
		.rustup.arches
		| (if is_alpine then "musl" else "glibc" end) as $libcKey
		| to_entries
		| map(
			.key as $bashbrewArch
			| (
				if is_alpine then
					{
						amd64: "x86_64",
						arm32v6: "armhf",
						arm32v7: "armv7",
						arm64v8: "aarch64",
						i386: "x86",
						ppc64le: "ppc64le",
						riscv64: "riscv64",
						s390x: "s390x",
					}
				else
					{
						amd64: "amd64",
						arm32v5: "armel",
						arm32v7: "armhf",
						arm64v8: "arm64",
						i386: "i386",
						mips64le: "mips64el",
						ppc64le: "ppc64el",
						riscv64: "riscv64",
						s390x: "s390x",
					}
				end
			)[$bashbrewArch] as $distroArch
			| select($distroArch)
			| .value
			| select(has($libcKey))
			| .[$libcKey]
			| (
-}}
		{{ $distroArch | @sh }}) rustArch={{ .arch | @sh }}; rustupUrl={{ .url | @sh }}; rustupSha256={{ .sha256 | @sh }} ;; \
{{
			)
		)
		| join("")
	)
-}}
	esac; \
	\
	if [ -n "$rustArch" ]; then \
		mkdir -p /tmp/rust; \
		\
		wget -O /tmp/rust/rustup-init "$rustupUrl"; \
		echo "$rustupSha256 */tmp/rust/rustup-init" | sha256sum --check --strict; \
		chmod +x /tmp/rust/rustup-init; \
		\
		export RUSTUP_HOME='/tmp/rust/rustup' CARGO_HOME='/tmp/rust/cargo'; \
		export PATH="$CARGO_HOME/bin:$PATH"; \
		/tmp/rust/rustup-init -y --no-modify-path --profile minimal --default-toolchain {{ .rust.version | @sh }} --default-host "$rustArch"; \
		\
		rustc --version; \
		cargo --version; \
	fi; \
	\
	wget -O ruby.tar.xz "$RUBY_DOWNLOAD_URL"; \
	echo "$RUBY_DOWNLOAD_SHA256 *ruby.tar.xz" | sha256sum --check --strict; \
	\
	mkdir -p /usr/src/ruby; \
	tar -xJf ruby.tar.xz -C /usr/src/ruby --strip-components=1; \
	rm ruby.tar.xz; \
	\
	cd /usr/src/ruby; \
	\
{{ if is_alpine then ( -}}
# https://github.com/docker-library/ruby/issues/196
# https://bugs.ruby-lang.org/issues/14387#note-13 (patch source)
# https://bugs.ruby-lang.org/issues/14387#note-16 ("Therefore ncopa's patch looks good for me in general." -- only breaks glibc which doesn't matter here)
	wget -O 'thread-stack-fix.patch' 'https://bugs.ruby-lang.org/attachments/download/7081/0001-thread_pthread.c-make-get_main_stack-portable-on-lin.patch'; \
	echo '3ab628a51d92fdf0d2b5835e93564857aea73e0c1de00313864a94a6255cb645 *thread-stack-fix.patch' | sha256sum --check --strict; \
	patch -p1 -i thread-stack-fix.patch; \
	rm thread-stack-fix.patch; \
	\
{{ ) else "" end -}}
	autoconf; \
	gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)"; \
# full RELRO: "-z now" disables lazy binding so the loader can map the GOT read-only at startup
# https://github.com/docker-library/ruby/pull/529
# https://salsa.debian.org/ruby-team/ruby/-/blob/8a55ab83e2c1783d80d0117fecbda533ac75f3e3/debian/rules#L63-67 (Debian's "hardening=+bindnow" produces the same flags)
	export LDFLAGS='-Wl,-z,relro -Wl,-z,now'; \
	./configure \
		--build="$gnuArch" \
		--disable-install-doc \
		--enable-shared \
		${rustArch:+--enable-yjit} \
{{ if env.version | IN("3.3", "3.4") then "" else ( -}}
		${rustArch:+--enable-zjit} \
{{ ) end -}}
	; \
	make -j "$(nproc)"; \
	make install; \
	\
	rm -rf /tmp/rust; \
{{ if is_alpine then ( -}}
	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; \
	apk del --no-network .ruby-builddeps; \
{{ ) else ( -}}
	apt-mark auto '.*' > /dev/null; \
	apt-mark manual $savedAptMark > /dev/null; \
	find /usr/local -type f -executable -not \( -name '*tkinter*' \) -exec ldd '{}' ';' \
		| awk '/=>/ { so = $(NF-1); if (index(so, "/usr/local/") == 1) { next }; gsub("^/(usr/)?", "", so); printf "*%s\n", so }' \
		| sort -u \
		| xargs -r dpkg-query --search \
# https://manpages.debian.org/bookworm/dpkg/dpkg-query.1.en.html#S (we ignore diversions and it'll be really unusual for more than one package to provide any given .so file)
		| awk 'sub(":$", "", $1) { print $1 }' \
		| sort -u \
		| xargs -r apt-mark manual \
	; \
	apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \
	{{ clean_apt }}; \
{{ ) end -}}
	\
	cd /; \
	rm -r /usr/src/ruby; \
# verify we have no "ruby" packages installed
{{ if is_alpine then ( -}}
	if \
		apk --no-network list --installed \
			| grep -v '^[.]ruby-' \
			| grep -i ruby \
	; then \
		exit 1; \
	fi; \
{{ ) else ( -}}
	if dpkg -l | grep -i ruby; then exit 1; fi; \
{{ ) end -}}
	[ "$(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
RUN set -eux; \
	mkdir "$GEM_HOME"; \
# adjust permissions of GEM_HOME for running "gem install" as an arbitrary user
	chmod 1777 "$GEM_HOME"

CMD [ "irb" ]