Dockerfile-alpine.template

{{
	def alpine_version:
		env.variant | ltrimstr("alpine")
-}}
FROM alpine:{{ alpine_version }}

# 70 is the standard uid/gid for "postgres" in Alpine
# https://git.alpinelinux.org/aports/tree/main/postgresql/postgresql.pre-install?h=3.12-stable
RUN set -eux; \
	addgroup -g 70 -S postgres; \
	adduser -u 70 -S -D -G postgres -H -h /var/lib/postgresql -s /bin/sh postgres; \
# also create the postgres user's home directory with appropriate permissions
# see https://github.com/docker-library/postgres/issues/274
	install --verbose --directory --owner postgres --group postgres --mode 1777 /var/lib/postgresql

# grab gosu for easy step-down from root
# https://github.com/tianon/gosu/releases
ENV GOSU_VERSION 1.17
RUN set -eux; \
	\
	apk add --no-cache --virtual .gosu-deps \
		ca-certificates \
		dpkg \
		gnupg \
	; \
	\
	dpkgArch="$(dpkg --print-architecture | awk -F- '{ print $NF }')"; \
	wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch"; \
	wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch.asc"; \
	\
# verify the signature
	export GNUPGHOME="$(mktemp -d)"; \
	gpg --batch --keyserver hkps://keys.openpgp.org --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4; \
	gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu; \
	gpgconf --kill all; \
	rm -rf "$GNUPGHOME" /usr/local/bin/gosu.asc; \
	\
# clean up fetch dependencies
	apk del --no-network .gosu-deps; \
	\
	chmod +x /usr/local/bin/gosu; \
# verify that the binary works
	gosu --version; \
	gosu nobody true
{{ if env.version | IN("12", "13", "14", "15", "16") then ( -}}
RUN set -eux; ln -svf gosu /usr/local/bin/su-exec; su-exec nobody true # backwards compatibility (removed in PostgreSQL 17+)
{{ ) else "" end -}}

# make the "en_US.UTF-8" locale so postgres will be utf-8 enabled by default
# alpine doesn't require explicit locale-file generation
ENV LANG en_US.utf8

RUN mkdir /docker-entrypoint-initdb.d

ENV PG_MAJOR {{ env.version }}
ENV PG_VERSION {{ .version }}
ENV PG_SHA256 {{ .sha256 }}

{{
	def llvmver:
		if alpine_version | split(".") | map(tonumber) < [3, 21] then
			"15"
		else
			"19"
		end
-}}
ENV DOCKER_PG_LLVM_DEPS \
		llvm{{ llvmver }}-dev \
		clang{{ llvmver }}

RUN set -eux; \
	\
	wget -O postgresql.tar.bz2 "https://ftp.postgresql.org/pub/source/v$PG_VERSION/postgresql-$PG_VERSION.tar.bz2"; \
	echo "$PG_SHA256 *postgresql.tar.bz2" | sha256sum -c -; \
	mkdir -p /usr/src/postgresql; \
	tar \
		--extract \
		--file postgresql.tar.bz2 \
		--directory /usr/src/postgresql \
		--strip-components 1 \
	; \
	rm postgresql.tar.bz2; \
	\
	apk add --no-cache --virtual .build-deps \
		$DOCKER_PG_LLVM_DEPS \
		bison \
		coreutils \
		dpkg-dev dpkg \
		flex \
		g++ \
		gcc \
		krb5-dev \
		libc-dev \
		libedit-dev \
		libxml2-dev \
		libxslt-dev \
		linux-headers \
		make \
		openldap-dev \
		openssl-dev \
		perl-dev \
		perl-ipc-run \
		perl-utils \
		python3-dev \
		tcl-dev \
		util-linux-dev \
		zlib-dev \
# https://www.postgresql.org/docs/10/static/release-10.html#id-1.11.6.9.5.13
		icu-dev \
{{ if .major >= 14 then ( -}}
# https://www.postgresql.org/docs/14/release-14.html#id-1.11.6.5.5.3.7
		lz4-dev \
{{ ) else "" end -}}
{{ if .major >= 15 then ( -}}
# https://www.postgresql.org/docs/15/release-15.html "--with-zstd to enable Zstandard builds"
		zstd-dev \
{{ ) else "" end -}}
	; \
	\
	cd /usr/src/postgresql; \
# update "DEFAULT_PGSOCKET_DIR" to "/var/run/postgresql" (matching Debian)
# see https://anonscm.debian.org/git/pkg-postgresql/postgresql.git/tree/debian/patches/51-default-sockets-in-var.patch?id=8b539fcb3e093a521c095e70bdfa76887217b89f
	awk '$1 == "#define" && $2 == "DEFAULT_PGSOCKET_DIR" && $3 == "\"/tmp\"" { $3 = "\"/var/run/postgresql\""; print; next } { print }' src/include/pg_config_manual.h > src/include/pg_config_manual.h.new; \
	grep '/var/run/postgresql' src/include/pg_config_manual.h.new; \
	mv src/include/pg_config_manual.h.new src/include/pg_config_manual.h; \
	gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)"; \
# explicitly update autoconf config.guess and config.sub so they support more arches/libcs
	wget -O config/config.guess 'https://git.savannah.gnu.org/cgit/config.git/plain/config.guess?id=7d3d27baf8107b630586c962c057e22149653deb'; \
	wget -O config/config.sub 'https://git.savannah.gnu.org/cgit/config.git/plain/config.sub?id=7d3d27baf8107b630586c962c057e22149653deb'; \
	\
# https://git.alpinelinux.org/aports/tree/community/postgresql15/APKBUILD?h=3.21-stable&id=40544ade947bec1798edb0f749f4e967e842624b#n172
	export LLVM_CONFIG="/usr/lib/llvm{{ llvmver }}/bin/llvm-config"; \
# https://git.alpinelinux.org/aports/tree/community/postgresql15/APKBUILD?h=3.21-stable&id=40544ade947bec1798edb0f749f4e967e842624b#n177
	export CLANG=clang-{{ llvmver }}; \
	\
# configure options taken from:
# https://anonscm.debian.org/cgit/pkg-postgresql/postgresql.git/tree/debian/rules?h=9.5
	./configure \
		--enable-option-checking=fatal \
		--build="$gnuArch" \
# "/usr/src/postgresql/src/backend/access/common/tupconvert.c:105: undefined reference to `libintl_gettext'"
#		--enable-nls \
		--enable-integer-datetimes \
{{ if .major <= 16 then ( -}}
{{ # in 17: this option is reversed. you need to disable it -}}
		--enable-thread-safety \
{{ ) else "" end -}}
		--enable-tap-tests \
# skip debugging info -- we want tiny size instead
#		--enable-debug \
		--disable-rpath \
		--with-uuid=e2fs \
{{ # in 16: "configure: error: unrecognized options: --with-gnu-ld" -}}
{{ # https://github.com/postgres/postgres/commit/9db49fc5bfdc0126be03f4b8986013e59d93b91d -}}
{{ if .major <= 15 then ( -}}
		--with-gnu-ld \
{{ ) else "" end -}}
		--with-pgport=5432 \
		--with-system-tzdata=/usr/share/zoneinfo \
		--prefix=/usr/local \
		--with-includes=/usr/local/include \
		--with-libraries=/usr/local/lib \
		--with-gssapi \
		--with-ldap \
		--with-tcl \
		--with-perl \
		--with-python \
#		--with-pam \
		--with-openssl \
		--with-libxml \
		--with-libxslt \
		--with-icu \
		--with-llvm \
{{ if .major >= 14 then ( -}}
		--with-lz4 \
{{ ) else "" end -}}
{{ if .major >= 15 then ( -}}
		--with-zstd \
{{ ) else "" end -}}
	; \
	make -j "$(nproc)" world-bin; \
	make install-world-bin; \
	make -C contrib 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 }' \
# Remove plperl, plpython and pltcl dependencies by default to save image size
# To use the pl extensions, those have to be installed in a derived image
			| grep -v -e perl -e python -e tcl \
	)"; \
	apk add --no-cache --virtual .postgresql-rundeps \
		$runDeps \
		bash \
		tzdata \
		zstd \
# https://wiki.alpinelinux.org/wiki/Release_Notes_for_Alpine_3.16.0#ICU_data_split
		icu-data-full \
# nss_wrapper is not availble on ppc64le: "test case segfaults in ppc64le"
# https://git.alpinelinux.org/aports/commit/testing/nss_wrapper/APKBUILD?h=3.17-stable&id=94d81ceeb58cff448d489bbcbe9a6d40c9991663
		$([ "$(apk --print-arch)" != 'ppc64le' ] && echo 'nss_wrapper') \
	; \
	apk del --no-network .build-deps; \
	cd /; \
	rm -rf \
		/usr/src/postgresql \
		/usr/local/share/doc \
		/usr/local/share/man \
	; \
	\
	postgres --version

# make the sample config easier to munge (and "correct by default")
RUN set -eux; \
	cp -v /usr/local/share/postgresql/postgresql.conf.sample /usr/local/share/postgresql/postgresql.conf.sample.orig; \
	sed -ri "s!^#?(listen_addresses)\s*=\s*\S+.*!\1 = '*'!" /usr/local/share/postgresql/postgresql.conf.sample; \
	grep -F "listen_addresses = '*'" /usr/local/share/postgresql/postgresql.conf.sample

RUN install --verbose --directory --owner postgres --group postgres --mode 3777 /var/run/postgresql

ENV PGDATA /var/lib/postgresql/data
# this 1777 will be replaced by 0700 at runtime (allows semi-arbitrary "--user" values)
RUN install --verbose --directory --owner postgres --group postgres --mode 1777 "$PGDATA"
VOLUME /var/lib/postgresql/data

COPY docker-entrypoint.sh docker-ensure-initdb.sh /usr/local/bin/
RUN ln -sT docker-ensure-initdb.sh /usr/local/bin/docker-enforce-initdb.sh
ENTRYPOINT ["docker-entrypoint.sh"]

# We set the default STOPSIGNAL to SIGINT, which corresponds to what PostgreSQL
# calls "Fast Shutdown mode" wherein new connections are disallowed and any
# in-progress transactions are aborted, allowing PostgreSQL to stop cleanly and
# flush tables to disk, which is the best compromise available to avoid data
# corruption.
#
# Users who know their applications do not keep open long-lived idle connections
# may way to use a value of SIGTERM instead, which corresponds to "Smart
# Shutdown mode" in which any existing sessions are allowed to finish and the
# server stops when all sessions are terminated.
#
# See https://www.postgresql.org/docs/12/server-shutdown.html for more details
# about available PostgreSQL server shutdown signals.
#
# See also https://www.postgresql.org/docs/12/server-start.html for further
# justification of this as the default value, namely that the example (and
# shipped) systemd service files use the "Fast Shutdown mode" for service
# termination.
#
STOPSIGNAL SIGINT
#
# An additional setting that is recommended for all users regardless of this
# value is the runtime "--stop-timeout" (or your orchestrator/runtime's
# equivalent) for controlling how long to wait between sending the defined
# STOPSIGNAL and sending SIGKILL (which is likely to cause data corruption).
#
# The default in most runtimes (such as Docker) is 10 seconds, and the
# documentation at https://www.postgresql.org/docs/12/server-start.html notes
# that even 90 seconds may not be long enough in many instances.

EXPOSE 5432
CMD ["postgres"]