#!/bin/bash

# Modified from
# https://github.com/GoogleCloudPlatform/compute-docker-mysql which is
# also Apache licensed, like Perkeep.

env
set -e

: ${ROOT:="/mysql"}
: ${INNODB_LOG_FILE_SIZE:=$((64 * 1024 * 1024))}
: ${INNODB_BUFFER_POOL_SIZE_PCT:=40}
: ${INNODB_BUFFER_POOL_SIZE:=$((
      $(cat /proc/meminfo | grep MemTotal: | awk '{print $2}') * 1024 *
      ${INNODB_BUFFER_POOL_SIZE_PCT} / 100
      ))}

bootstrap() {
  if [[ -d ${ROOT}/datadir ]]
  then
    return
  fi

  mkdir -p ${ROOT}/datadir/mysql ${ROOT}/tmp

  (
    echo 'use mysql;'
    cat /usr/share/mysql/mysql_system_tables.sql
    cat /usr/share/mysql/mysql_system_tables_data.sql |
    sed -e "s/^SELECT.*INTO @current_hostname;$/SELECT '%' INTO @current_hostname;/"
  ) |
  /usr/sbin/mysqld \
    --no-defaults --bootstrap \
    --datadir=${ROOT}/datadir \
    --tmpdir=${ROOT}/tmp/ \
    --lc-messages-dir=/usr/share/mysql \
    --character-sets-dir=/usr/share/mysql/charsets \
    --innodb_log_file_size=${INNODB_LOG_FILE_SIZE} \
    --innodb_buffer_pool_size=${INNODB_BUFFER_POOL_SIZE}
}

bootstrap

exec /usr/sbin/mysqld \
  --no-defaults \
  --datadir=${ROOT}/datadir \
  --tmpdir=${ROOT}/tmp/ \
  --lc-messages-dir=/usr/share/mysql \
  --character-sets-dir=/usr/share/mysql/charsets \
  --sock=${ROOT}/mysql.sock \
  --pid-file=${ROOT}/mysql.pid \
  --innodb_file_per_table \
  --skip-name-resolve \
  --user=root \
  --port=3306 \
  --innodb_log_file_size=${INNODB_LOG_FILE_SIZE} \
  --innodb_buffer_pool_size=${INNODB_BUFFER_POOL_SIZE}