Templatize and refactor 5.7+ entrypoint scripts

.template.Debian/docker-entrypoint.sh

@@ -0,0 +1,360 @@
+#!/bin/bash
+set -eo pipefail
+shopt -s nullglob
+
+# logging functions
+mysql_log() {
+	local type="$1"; shift
+	printf '%s [%s] [Entrypoint]: %s\n' "$(date --rfc-3339=seconds)" "$type" "$*"
+}
+mysql_note() {
+	mysql_log Note "$@"
+}
+mysql_warn() {
+	mysql_log Warn "$@" >&2
+}
+mysql_error() {
+	mysql_log ERROR "$@" >&2
+	exit 1
+}
+
+# usage: file_env VAR [DEFAULT]
+#    ie: file_env 'XYZ_DB_PASSWORD' 'example'
+# (will allow for "$XYZ_DB_PASSWORD_FILE" to fill in the value of
+#  "$XYZ_DB_PASSWORD" from a file, especially for Docker's secrets feature)
+file_env() {
+	local var="$1"
+	local fileVar="${var}_FILE"
+	local def="${2:-}"
+	if [ "${!var:-}" ] && [ "${!fileVar:-}" ]; then
+		mysql_error "Both $var and $fileVar are set (but are exclusive)"
+	fi
+	local val="$def"
+	if [ "${!var:-}" ]; then
+		val="${!var}"
+	elif [ "${!fileVar:-}" ]; then
+		val="$(< "${!fileVar}")"
+	fi
+	export "$var"="$val"
+	unset "$fileVar"
+}
+
+# check to see if this file is being run or sourced from another script
+_is_sourced() {
+	# https://unix.stackexchange.com/a/215279
+	[ "${FUNCNAME[${#FUNCNAME[@]} - 1]}" == 'source' ]
+}
+
+# usage: docker_process_init_files [file [file [...]]]
+#    ie: docker_process_init_files /always-initdb.d/*
+# process initializer files, based on file extensions
+docker_process_init_files() {
+	# mysql here for backwards compatibility "${mysql[@]}"
+	mysql=( docker_process_sql )
+
+	echo
+	local f
+	for f; do
+		case "$f" in
+			*.sh)     mysql_note "$0: running $f"; . "$f" ;;
+			*.sql)    mysql_note "$0: running $f"; docker_process_sql < "$f"; echo ;;
+			*.sql.gz) mysql_note "$0: running $f"; gunzip -c "$f" | docker_process_sql; echo ;;
+			*)        mysql_warn "$0: ignoring $f" ;;
+		esac
+		echo
+	done
+}
+
+mysql_check_config() {
+	local toRun=( "$@" --verbose --help ) errors
+	if ! errors="$("${toRun[@]}" 2>&1 >/dev/null)"; then
+		mysql_error $'mysqld failed while attempting to check config\n\tcommand was: '"${toRun[*]}"$'\n\t'"$errors"
+	fi
+}
+
+# Fetch value from server config
+# We use mysqld --verbose --help instead of my_print_defaults because the
+# latter only show values present in config files, and not server defaults
+mysql_get_config() {
+	local conf="$1"; shift
+	"$@" --verbose --help --log-bin-index="$(mktemp -u)" 2>/dev/null \
+		| awk -v conf="$conf" '$1 == conf && /^[^ \t]/ { sub(/^[^ \t]+[ \t]+/, ""); print; exit }'
+	# match "datadir      /some/path with/spaces in/it here" but not "--xyz=abc\n     datadir (xyz)"
+}
+
+# Do a temporary startup of the MySQL server, for init purposes
+docker_temp_server_start() {
+	if [ "${MYSQL_MAJOR}" = '5.6' ]; then
+		"$@" --skip-networking --socket="${SOCKET}" &
+		mysql_note "Waiting for server startup"
+		local i
+		for i in {30..0}; do
+			# only use the root password if the database has already been initializaed
+			# so that it won't try to fill in a password file when it hasn't been set yet
+			extraArgs=()
+			if [ -z "$DATABASE_ALREADY_EXISTS" ]; then
+				extraArgs+=( '--dont-use-mysql-root-password' )
+			fi
+			if docker_process_sql "${extraArgs[@]}" --database=mysql <<<'SELECT 1' &> /dev/null; then
+				break
+			fi
+			sleep 1
+		done
+		if [ "$i" = 0 ]; then
+			mysql_error "Unable to start server."
+		fi
+	else
+		# For 5.7+ the server is ready for use as soon as startup command unblocks
+		if ! "$@" --daemonize --skip-networking --socket="${SOCKET}"; then
+			mysql_error "Unable to start server."
+		fi
+	fi
+}
+
+# Stop the server. When using a local socket file mysqladmin will block until
+# the shutdown is complete.
+docker_temp_server_stop() {
+	if ! mysqladmin --defaults-extra-file=<( _mysql_passfile ) shutdown -uroot --socket="${SOCKET}"; then
+		mysql_error "Unable to shut down server."
+	fi
+}
+
+# Verify that the minimally required password settings are set for new databases.
+docker_verify_minimum_env() {
+	if [ -z "$MYSQL_ROOT_PASSWORD" -a -z "$MYSQL_ALLOW_EMPTY_PASSWORD" -a -z "$MYSQL_RANDOM_ROOT_PASSWORD" ]; then
+		mysql_error $'Database is uninitialized and password option is not specified\n\tYou need to specify one of MYSQL_ROOT_PASSWORD, MYSQL_ALLOW_EMPTY_PASSWORD and MYSQL_RANDOM_ROOT_PASSWORD'
+	fi
+}
+
+# creates folders for the database
+# also ensures permission for user mysql of run as root
+docker_create_db_directories() {
+	local user; user="$(id -u)"
+
+	# TODO other directories that are used by default? like /var/lib/mysql-files
+	# see https://github.com/docker-library/mysql/issues/562
+	mkdir -p "$DATADIR"
+
+	if [ "$user" = "0" ]; then
+		# this will cause less disk access than `chown -R`
+		find "$DATADIR" \! -user mysql -exec chown mysql '{}' +
+	fi
+}
+
+# initializes the database directory
+docker_init_database_dir() {
+	mysql_note "Initializing database files"
+	if [ "$MYSQL_MAJOR" = '5.6' ]; then
+		mysql_install_db --datadir="$DATADIR" --rpm --keep-my-cnf "${@:2}"
+	else
+		"$@" --initialize-insecure
+	fi
+	mysql_note "Database files initialized"
+
+	if command -v mysql_ssl_rsa_setup > /dev/null && [ ! -e "$DATADIR/server-key.pem" ]; then
+		# https://github.com/mysql/mysql-server/blob/23032807537d8dd8ee4ec1c4d40f0633cd4e12f9/packaging/deb-in/extra/mysql-systemd-start#L81-L84
+		mysql_note "Initializing certificates"
+		mysql_ssl_rsa_setup --datadir="$DATADIR"
+		mysql_note "Certificates initialized"
+	fi
+}
+
+# Loads various settings that are used elsewhere in the script
+# This should be called after mysql_check_config, but before any other functions
+docker_setup_env() {
+	# Get config
+	declare -g DATADIR SOCKET
+	DATADIR="$(mysql_get_config 'datadir' "$@")"
+	SOCKET="$(mysql_get_config 'socket' "$@")"
+
+	# Initialize values that might be stored in a file
+	file_env 'MYSQL_ROOT_HOST' '%'
+	file_env 'MYSQL_DATABASE'
+	file_env 'MYSQL_USER'
+	file_env 'MYSQL_PASSWORD'
+	file_env 'MYSQL_ROOT_PASSWORD'
+
+	declare -g DATABASE_ALREADY_EXISTS
+	if [ -d "$DATADIR/mysql" ]; then
+		DATABASE_ALREADY_EXISTS='true'
+	fi
+}
+
+# Execute sql script, passed via stdin
+# usage: docker_process_sql [--dont-use-mysql-root-password] [mysql-cli-args]
+#    ie: docker_process_sql --database=mydb <<<'INSERT ...'
+#    ie: docker_process_sql --dont-use-mysql-root-password --database=mydb <my-file.sql
+docker_process_sql() {
+	passfileArgs=()
+	if [ '--dont-use-mysql-root-password' = "$1" ]; then
+		passfileArgs+=( "$1" )
+		shift
+	fi
+	# args sent in can override this db, since they will be later in the command
+	if [ -n "$MYSQL_DATABASE" ]; then
+		set -- --database="$MYSQL_DATABASE" "$@"
+	fi
+
+	mysql --defaults-file=<( _mysql_passfile "${passfileArgs[@]}") --protocol=socket -uroot -hlocalhost --socket="${SOCKET}" "$@"
+}
+
+# Initializes database with timezone info and root password, plus optional extra db/user
+docker_setup_db() {
+	# Load timezone info into database
+	if [ -z "$MYSQL_INITDB_SKIP_TZINFO" ]; then
+		# sed is for https://bugs.mysql.com/bug.php?id=20545
+		mysql_tzinfo_to_sql /usr/share/zoneinfo \
+			| sed 's/Local time zone must be set--see zic manual page/FCTY/' \
+			| docker_process_sql --dont-use-mysql-root-password --database=mysql
+			# tell docker_process_sql to not use MYSQL_ROOT_PASSWORD since it is not set yet
+	fi
+	# Generate random root password
+	if [ -n "$MYSQL_RANDOM_ROOT_PASSWORD" ]; then
+		export MYSQL_ROOT_PASSWORD="$(pwgen -1 32)"
+		mysql_note "GENERATED ROOT PASSWORD: $MYSQL_ROOT_PASSWORD"
+	fi
+	# Sets root password and creates root users for non-localhost hosts
+	local rootCreate=
+	# default root to listen for connections from anywhere
+	if [ -n "$MYSQL_ROOT_HOST" ] && [ "$MYSQL_ROOT_HOST" != 'localhost' ]; then
+		# no, we don't care if read finds a terminating character in this heredoc
+		# https://unix.stackexchange.com/questions/265149/why-is-set-o-errexit-breaking-this-read-heredoc-expression/265151#265151
+		read -r -d '' rootCreate <<-EOSQL || true
+			CREATE USER 'root'@'${MYSQL_ROOT_HOST}' IDENTIFIED BY '${MYSQL_ROOT_PASSWORD}' ;
+			GRANT ALL ON *.* TO 'root'@'${MYSQL_ROOT_HOST}' WITH GRANT OPTION ;
+		EOSQL
+	fi
+
+	local passwordSet=
+	if [ "$MYSQL_MAJOR" = '5.6' ]; then
+		# no, we don't care if read finds a terminating character in this heredoc (see above)
+		read -r -d '' passwordSet <<-EOSQL || true
+			DELETE FROM mysql.user WHERE user NOT IN ('mysql.sys', 'mysqlxsys', 'root') OR host NOT IN ('localhost') ;
+			SET PASSWORD FOR 'root'@'localhost'=PASSWORD('${MYSQL_ROOT_PASSWORD}') ;
+		EOSQL
+	else
+		# no, we don't care if read finds a terminating character in this heredoc (see above)
+		read -r -d '' passwordSet <<-EOSQL || true
+			ALTER USER 'root'@'localhost' IDENTIFIED BY '${MYSQL_ROOT_PASSWORD}' ;
+		EOSQL
+	fi
+
+	# tell docker_process_sql to not use MYSQL_ROOT_PASSWORD since it is just now being set
+	docker_process_sql --dont-use-mysql-root-password --database=mysql <<-EOSQL
+		-- What's done in this file shouldn't be replicated
+		--  or products like mysql-fabric won't work
+		SET @@SESSION.SQL_LOG_BIN=0;
+
+		${passwordSet}
+		GRANT ALL ON *.* TO 'root'@'localhost' WITH GRANT OPTION ;
+		FLUSH PRIVILEGES ;
+		${rootCreate}
+		DROP DATABASE IF EXISTS test ;
+	EOSQL
+
+	# Creates a custom database and user if specified
+	if [ -n "$MYSQL_DATABASE" ]; then
+		mysql_note "Creating database ${MYSQL_DATABASE}"
+		docker_process_sql --database=mysql <<<"CREATE DATABASE IF NOT EXISTS \`$MYSQL_DATABASE\` ;"
+	fi
+
+	if [ -n "$MYSQL_USER" ] && [ -n "$MYSQL_PASSWORD" ]; then
+		mysql_note "Creating user ${MYSQL_USER}"
+		docker_process_sql --database=mysql <<<"CREATE USER '$MYSQL_USER'@'%' IDENTIFIED BY '$MYSQL_PASSWORD' ;"
+
+		if [ -n "$MYSQL_DATABASE" ]; then
+			mysql_note "Giving user ${MYSQL_USER} access to schema ${MYSQL_DATABASE}"
+			docker_process_sql --database=mysql <<<"GRANT ALL ON \`$MYSQL_DATABASE\`.* TO '$MYSQL_USER'@'%' ;"
+		fi
+
+		docker_process_sql --database=mysql <<<"FLUSH PRIVILEGES ;"
+	fi
+}
+
+_mysql_passfile() {
+	# echo the password to the "file" the client uses
+	# the client command will use process substitution to create a file on the fly
+	# ie: --defaults-file=<( _mysql_passfile )
+	if [ '--dont-use-mysql-root-password' != "$1" ] && [ -n "$MYSQL_ROOT_PASSWORD" ]; then
+		cat <<-EOF
+			[client]
+			password="${MYSQL_ROOT_PASSWORD}"
+		EOF
+	fi
+}
+
+# Mark root user as expired so the password must be changed before anything
+# else can be done (only supported for 5.6+)
+mysql_expire_root_user() {
+	if [ -n "$MYSQL_ONETIME_PASSWORD" ]; then
+		docker_process_sql --database=mysql <<-EOSQL
+			ALTER USER 'root'@'%' PASSWORD EXPIRE;
+		EOSQL
+	fi
+}
+
+# check arguments for an option that would cause mysqld to stop
+# return true if there is one
+_mysql_want_help() {
+	local arg
+	for arg; do
+		case "$arg" in
+			-'?'|--help|--print-defaults|-V|--version)
+				return 0
+				;;
+		esac
+	done
+	return 1
+}
+
+_main() {
+	# if command starts with an option, prepend mysqld
+	if [ "${1:0:1}" = '-' ]; then
+		set -- mysqld "$@"
+	fi
+
+	# skip setup if they aren't running mysqld or want an option that stops mysqld
+	if [ "$1" = 'mysqld' ] && ! _mysql_want_help "$@"; then
+		mysql_note "Entrypoint script for MySQL Server ${MYSQL_VERSION} started."
+
+		mysql_check_config "$@"
+		# Load various environment variables
+		docker_setup_env "$@"
+		docker_create_db_directories
+
+		# If container is started as root user, restart as dedicated mysql user
+		if [ "$(id -u)" = "0" ]; then
+			mysql_note "Switching to dedicated user 'mysql'"
+			exec gosu mysql "$BASH_SOURCE" "$@"
+		fi
+
+		# there's no database, so it needs to be initialized
+		if [ -z "$DATABASE_ALREADY_EXISTS" ]; then
+			docker_verify_minimum_env
+			docker_init_database_dir "$@"
+
+			mysql_note "Starting temporary server"
+			docker_temp_server_start "$@"
+			mysql_note "Temporary server started."
+
+			docker_setup_db
+			docker_process_init_files /docker-entrypoint-initdb.d/*
+
+			mysql_expire_root_user
+
+			mysql_note "Stopping temporary server"
+			docker_temp_server_stop
+			mysql_note "Temporary server stopped"
+
+			echo
+			mysql_note "MySQL init process done. Ready for start up."
+			echo
+		fi
+	fi
+	exec "$@"
+}
+
+# If we are sourced from elsewhere, don't perform any further actions
+if ! _is_sourced; then
+	_main "$@"
+fi