# vim:set ft=dockerfile:
ARG major_version=12
ARG minor_version=0
FROM postgres:$major_version.$minor_version-alpine

ARG major_version
ENV PG_MAJOR $major_version

# build latest snapshot code
RUN set -ex \
	\
	&& apk add --no-cache --virtual .fetch-deps \
		ca-certificates \
		openssl \
		openssl-dev \
		tar \
	\
	&& wget -O postgresql.tar.bz2 "https://ftp.postgresql.org/pub/snapshot/$PG_MAJOR/postgresql-$PG_MAJOR-snapshot.tar.bz2" \
	&& 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 \
		bison \
		coreutils \
		dpkg-dev dpkg \
		flex \
		gcc \
#		krb5-dev \
		libc-dev \
		libedit-dev \
		libxml2-dev \
		libxslt-dev \
		linux-headers \
		make \
#		openldap-dev \
		openssl-dev \
# configure: error: prove not found
#		perl-utils \
# configure: error: Perl module IPC::Run is required to run TAP tests
#		perl-ipc-run \
#		perl-dev \
#		python-dev \
#		python3-dev \
#		tcl-dev \
		util-linux-dev \
		zlib-dev \
	\
	&& 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' \
# configure options taken from:
# https://anonscm.debian.org/cgit/pkg-postgresql/postgresql.git/tree/debian/rules?h=9.5
	&& ./configure \
		--build="$gnuArch" \
# "/usr/src/postgresql/src/backend/access/common/tupconvert.c:105: undefined reference to `libintl_gettext'"
#		--enable-nls \
		--enable-thread-safety \
#		--enable-tap-tests \
# skip debugging info -- we want tiny size instead
#		--enable-debug \
		--disable-rpath \
		--with-uuid=e2fs \
		--with-gnu-ld \
		--with-pgport=5432 \
		--with-system-tzdata=/usr/share/zoneinfo \
		--prefix=/usr/local \
		--with-includes=/usr/local/include \
		--with-libraries=/usr/local/lib \
		\
# these make our image abnormally large (at least 100MB larger), which seems uncouth for an "Alpine" (ie, "small") variant :)
#		--with-krb5 \
#		--with-gssapi \
#		--with-ldap \
#		--with-tcl \
#		--with-perl \
#		--with-python \
#		--with-pam \
		--with-openssl \
		--with-libxml \
		--with-libxslt \
	&& make -j "$(nproc)" world \
	&& make install-world \
	&& 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 }' \
	)" \
	&& apk add --no-cache --virtual .postgresql-rundeps \
		$runDeps \
		bash \
		su-exec \
# tzdata is optional, but only adds around 1Mb to image size and is recommended by Django documentation:
# https://docs.djangoproject.com/en/1.10/ref/databases/#optimizing-postgresql-s-configuration
		tzdata \
	&& apk del .fetch-deps .build-deps \
	&& cd / \
	&& rm -rf \
		/usr/src/postgresql \
		/usr/local/share/doc \
		/usr/local/share/man \
	&& find /usr/local -name '*.a' -delete