Make template for 5.7+ entrypoint script

5.7 and 8.0 can use the exact same entrypoint script, so
simply have the update script copy it from a template location.

template.Debian/docker-entrypoint.sh

@@ -0,0 +1,216 @@
+#!/bin/bash
+set -eo pipefail
+shopt -s nullglob
+
+# if command starts with an option, prepend mysqld
+if [ "${1:0:1}" = '-' ]; then
+	set -- mysqld "$@"
+fi
+
+# skip setup if they want an option that stops mysqld
+wantHelp=
+for arg; do
+	case "$arg" in
+		-'?'|--help|--print-defaults|-V|--version)
+			wantHelp=1
+			break
+			;;
+	esac
+done
+
+# usage: file_env VAR [DEFAULT]
+#    ie: file_env 'XYZ_DB_PASSWORD' 'example'
+# (will allow for "$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
+		echo >&2 "error: both $var and $fileVar are set (but are exclusive)"
+		exit 1
+	fi
+	local val="$def"
+	if [ "${!var:-}" ]; then
+		val="${!var}"
+	elif [ "${!fileVar:-}" ]; then
+		val="$(< "${!fileVar}")"
+	fi
+	export "$var"="$val"
+	unset "$fileVar"
+}
+
+# usage: process_init_file FILENAME MYSQLCOMMAND...
+#    ie: process_init_file foo.sh mysql -uroot
+# (process a single initializer file, based on its extension. we define this
+# function here, so that initializer scripts (*.sh) can use the same logic,
+# potentially recursively, or override the logic used in subsequent calls)
+process_init_file() {
+	local f="$1"; shift
+	local mysql=( "$@" )
+
+	case "$f" in
+		*.sh)     echo "$0: running $f"; . "$f" ;;
+		*.sql)    echo "$0: running $f"; "${mysql[@]}" < "$f"; echo ;;
+		*.sql.gz) echo "$0: running $f"; gunzip -c "$f" | "${mysql[@]}"; echo ;;
+		*)        echo "$0: ignoring $f" ;;
+	esac
+	echo
+}
+
+_check_config() {
+	toRun=( "$@" --verbose --help )
+	if ! errors="$("${toRun[@]}" 2>&1 >/dev/null)"; then
+		cat >&2 <<-EOM
+
+			ERROR: mysqld failed while attempting to check config
+			command was: "${toRun[*]}"
+
+			$errors
+		EOM
+		exit 1
+	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
+_get_config() {
+	local conf="$1"; shift
+	"$@" --verbose --help --log-bin-index="$(mktemp -u)" 2>/dev/null \
+		| awk '$1 == "'"$conf"'" && /^[^ \t]/ { sub(/^[^ \t]+[ \t]+/, ""); print; exit }'
+	# match "datadir      /some/path with/spaces in/it here" but not "--xyz=abc\n     datadir (xyz)"
+}
+
+# allow the container to be started with `--user`
+if [ "$1" = 'mysqld' -a -z "$wantHelp" -a "$(id -u)" = '0' ]; then
+	_check_config "$@"
+	DATADIR="$(_get_config 'datadir' "$@")"
+	mkdir -p "$DATADIR"
+	chown -R mysql:mysql "$DATADIR"
+	exec gosu mysql "$BASH_SOURCE" "$@"
+fi
+
+if [ "$1" = 'mysqld' -a -z "$wantHelp" ]; then
+	# still need to check config, container may have started with --user
+	_check_config "$@"
+	# Get config
+	DATADIR="$(_get_config 'datadir' "$@")"
+
+	if [ ! -d "$DATADIR/mysql" ]; then
+		file_env 'MYSQL_ROOT_PASSWORD'
+		if [ -z "$MYSQL_ROOT_PASSWORD" -a -z "$MYSQL_ALLOW_EMPTY_PASSWORD" -a -z "$MYSQL_RANDOM_ROOT_PASSWORD" ]; then
+			echo >&2 'error: database is uninitialized and password option is not specified '
+			echo >&2 '  You need to specify one of MYSQL_ROOT_PASSWORD, MYSQL_ALLOW_EMPTY_PASSWORD and MYSQL_RANDOM_ROOT_PASSWORD'
+			exit 1
+		fi
+
+		mkdir -p "$DATADIR"
+
+		echo 'Initializing database'
+		"$@" --initialize-insecure
+		echo 'Database initialized'
+
+		if command -v mysql_ssl_rsa_setup > /dev/null && [ ! -e "$DATADIR/server-key.pem" ]; then
+			# https://github.com/mysql/mysql-server/blob/23032807537d8dd8ee4ec1c4d40f0633cd4e12f9/packaging/deb-in/extra/mysql-systemd-start#L81-L84
+			echo 'Initializing certificates'
+			mysql_ssl_rsa_setup --datadir="$DATADIR"
+			echo 'Certificates initialized'
+		fi
+
+		SOCKET="$(_get_config 'socket' "$@")"
+		"$@" --skip-networking --socket="${SOCKET}" &
+		pid="$!"
+
+		mysql=( mysql --protocol=socket -uroot -hlocalhost --socket="${SOCKET}" )
+
+		for i in {30..0}; do
+			if echo 'SELECT 1' | "${mysql[@]}" &> /dev/null; then
+				break
+			fi
+			echo 'MySQL init process in progress...'
+			sleep 1
+		done
+		if [ "$i" = 0 ]; then
+			echo >&2 'MySQL init process failed.'
+			exit 1
+		fi
+
+		if [ -z "$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/' | "${mysql[@]}" mysql
+		fi
+
+		if [ ! -z "$MYSQL_RANDOM_ROOT_PASSWORD" ]; then
+			export MYSQL_ROOT_PASSWORD="$(pwgen -1 32)"
+			echo "GENERATED ROOT PASSWORD: $MYSQL_ROOT_PASSWORD"
+		fi
+
+		rootCreate=
+		# default root to listen for connections from anywhere
+		file_env 'MYSQL_ROOT_HOST' '%'
+		if [ ! -z "$MYSQL_ROOT_HOST" -a "$MYSQL_ROOT_HOST" != 'localhost' ]; then
+			# no, we don't care if read finds a terminating character in this heredoc
+			# https://unix.stackexchange.com/questions/265149/why-is-set-o-errexit-breaking-this-read-heredoc-expression/265151#265151
+			read -r -d '' rootCreate <<-EOSQL || true
+				CREATE USER 'root'@'${MYSQL_ROOT_HOST}' IDENTIFIED BY '${MYSQL_ROOT_PASSWORD}' ;
+				GRANT ALL ON *.* TO 'root'@'${MYSQL_ROOT_HOST}' WITH GRANT OPTION ;
+			EOSQL
+		fi
+
+		"${mysql[@]}" <<-EOSQL
+			-- What's done in this file shouldn't be replicated
+			--  or products like mysql-fabric won't work
+			SET @@SESSION.SQL_LOG_BIN=0;
+
+			ALTER USER 'root'@'localhost' IDENTIFIED BY '${MYSQL_ROOT_PASSWORD}' ;
+			GRANT ALL ON *.* TO 'root'@'localhost' WITH GRANT OPTION ;
+			${rootCreate}
+			DROP DATABASE IF EXISTS test ;
+			FLUSH PRIVILEGES ;
+		EOSQL
+
+		if [ ! -z "$MYSQL_ROOT_PASSWORD" ]; then
+			mysql+=( -p"${MYSQL_ROOT_PASSWORD}" )
+		fi
+
+		file_env 'MYSQL_DATABASE'
+		if [ "$MYSQL_DATABASE" ]; then
+			echo "CREATE DATABASE IF NOT EXISTS \`$MYSQL_DATABASE\` ;" | "${mysql[@]}"
+			mysql+=( "$MYSQL_DATABASE" )
+		fi
+
+		file_env 'MYSQL_USER'
+		file_env 'MYSQL_PASSWORD'
+		if [ "$MYSQL_USER" -a "$MYSQL_PASSWORD" ]; then
+			echo "CREATE USER '$MYSQL_USER'@'%' IDENTIFIED BY '$MYSQL_PASSWORD' ;" | "${mysql[@]}"
+
+			if [ "$MYSQL_DATABASE" ]; then
+				echo "GRANT ALL ON \`$MYSQL_DATABASE\`.* TO '$MYSQL_USER'@'%' ;" | "${mysql[@]}"
+			fi
+
+			echo 'FLUSH PRIVILEGES ;' | "${mysql[@]}"
+		fi
+
+		echo
+		for f in /docker-entrypoint-initdb.d/*; do
+			process_init_file "$f" "${mysql[@]}"
+		done
+
+		if [ ! -z "$MYSQL_ONETIME_PASSWORD" ]; then
+			"${mysql[@]}" <<-EOSQL
+				ALTER USER 'root'@'%' PASSWORD EXPIRE;
+			EOSQL
+		fi
+		if ! kill -s TERM "$pid" || ! wait "$pid"; then
+			echo >&2 'MySQL init process failed.'
+			exit 1
+		fi
+
+		echo
+		echo 'MySQL init process done. Ready for start up.'
+		echo
+	fi
+fi
+
+exec "$@"

update.sh

@@ -14,7 +14,14 @@ declare -A debianVariants=(
 	#[5.5]='jessie'
 )
 
+# Copy entrypoint template
+templateVersions=( "5.7 8.0" )
+for version in ${templateVersions}; do
+	cp "template.Debian/docker-entrypoint.sh" "${version}/"
+done
+
 for version in "${versions[@]}"; do
+	if [ "${version}" = "template.Debian" ]; then continue; fi # If update.sh is run without arguments, the template directory is included in the list
 	debianVariant="${debianVariants[$version]:-$defaultDebianVariant}"
 	debianSuite="${debianVariant%%-*}" # "stretch", etc