# vim:set ft=dockerfile:
FROM debian:buster-slim

# add our user and group first to make sure their IDs get assigned consistently, regardless of whatever dependencies get added
RUN groupadd -r mysql && useradd -r -g mysql mysql

# https://bugs.debian.org/830696 (apt uses gpgv by default in newer releases, rather than gpg)
RUN set -ex; \
	apt-get update; \
	if ! which gpg; then \
		apt-get install -y --no-install-recommends gnupg; \
	fi; \
	if ! gpg --version | grep -q '^gpg (GnuPG) 1\.'; then \
# Ubuntu includes "gnupg" (not "gnupg2", but still 2.x), but not dirmngr, and gnupg 2.x requires dirmngr
# so, if we're not running gnupg 1.x, explicitly install dirmngr too
		apt-get install -y --no-install-recommends dirmngr; \
	fi; \
	rm -rf /var/lib/apt/lists/*; 

# add gosu for easy step-down from root
# https://github.com/tianon/gosu/releases
ENV GOSU_VERSION 1.12
RUN set -eux; \
	savedAptMark="$(apt-mark showmanual)"; \
	apt-get update; \
	apt-get install -y --no-install-recommends ca-certificates wget; \
	rm -rf /var/lib/apt/lists/*; \
	dpkgArch="$(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-$dpkgArch.asc"; \
	export GNUPGHOME="$(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 "$GNUPGHOME" /usr/local/bin/gosu.asc; \
	apt-mark auto '.*' > /dev/null; \
	[ -z "$savedAptMark" ] || apt-mark manual $savedAptMark > /dev/null; \
	apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \
	chmod +x /usr/local/bin/gosu; \
	gosu --version; \
	gosu nobody true

RUN mkdir /docker-entrypoint-initdb.d

# install "pwgen" for randomizing passwords
# install "tzdata" for /usr/share/zoneinfo/
# install "xz-utils" for .sql.xz docker-entrypoint-initdb.d files
RUN set -ex; \
	apt-get update; \
	apt-get install -y --no-install-recommends \
		pwgen \
		tzdata \
		xz-utils \
	; \
	rm -rf /var/lib/apt/lists/*

# bashbrew-architectures: amd64 arm64v8 ppc64le
#ENV MARIADB_MAJOR 10.3
#ENV MARIADB_VERSION 1:10.3.22-0+deb10u1
# release-status:RC
# (https://downloads.mariadb.org/mariadb/+releases/)

# add repository pinning to make sure dependencies from this MariaDB repo are preferred over Debian dependencies
#  libmariadbclient18 : Depends: libmysqlclient18 (= 5.5.42+maria-1~wheezy) but 5.5.43-0+deb7u1 is to be installed

# the "/var/lib/mysql" stuff here is because the mysql-server postinst doesn't have an explicit way to disable the mysql_install_db codepath besides having a database already "configured" (ie, stuff in /var/lib/mysql/mysql)
# also, we set debconf keys to make APT a little quieter
RUN set -ex; \
	{ \
		echo "mariadb-server-$MARIADB_MAJOR" mysql-server/root_password password 'unused'; \
		echo "mariadb-server-$MARIADB_MAJOR" mysql-server/root_password_again password 'unused'; \
	} | debconf-set-selections; \
	apt-get update; \
	apt-get install -y \
		"mariadb-server" \
# mariadb-backup is installed at the same time so that `mysql-common` is only installed once from just mariadb repos
		mariadb-backup \
		socat \
	; \
	rm -rf /var/lib/apt/lists/*; \
# comment out any "user" entires in the MySQL config ("docker-entrypoint.sh" or "--user" will handle user switching)
	sed -ri 's/^user\s/#&/' /etc/mysql/my.cnf /etc/mysql/conf.d/*; \
	echo '[mysqld]\ninnodb_use_native_aio = 0\ninnodb_file_per_table = 1\n' >>/etc/mysql/conf.d/innodb_aio.cnf; \
# purge and re-create /var/lib/mysql with appropriate ownership
	rm -rf /var/lib/mysql; \
	mkdir -p /var/lib/mysql /var/run/mysqld; \
	chown -R mysql:mysql /var/lib/mysql /var/run/mysqld; \
# ensure that /var/run/mysqld (used for socket and lock files) is writable regardless of the UID our mysqld instance ends up having at runtime
	chmod 777 /var/run/mysqld; \
# comment out a few problematic configuration values
	find /etc/mysql/ -name '*.cnf' -print0 \
		| xargs -0 grep -lZE '^(bind-address|log)' \
		| xargs -rt -0 sed -Ei 's/^(bind-address|log)/#&/'; \
# don't reverse lookup hostnames, they are usually another container
	echo '[mysqld]\nskip-host-cache\nskip-name-resolve' > /etc/mysql/conf.d/docker.cnf; \
	apt-get clean -y;
	
VOLUME /var/lib/mysql

COPY docker-entrypoint.sh /usr/local/bin/

ENTRYPOINT ["docker-entrypoint.sh"]
EXPOSE 3306
CMD ["mysqld"]