#!/bin/sh

# This script creates the mysql data directory during first service start.

# In subsequent starts, it does nothing much.

# extract value of a MySQL option from config files

# Usage: get_mysql_option SECTION VARNAME DEFAULT

# result is returned in $result

# We use my_print_defaults which prints all options from multiple files,

# with the more specific ones later; hence take the last match.

get_mysql_option(){

        result=`/usr/bin/my_print_defaults "$1" | sed -n "s/^--$2=//p" | tail -n 1`

        if [ -z "$result" ]; then

            # not found, use default

            result="$3"

        fi

}

# Defaults here had better match what mysqld_safe will default to

get_mysql_option mysqld datadir "/var/lib/mysql"

datadir="$result"

get_mysql_option mysqld_safe log-error "/var/log/mariadb/mariadb.log"

errlogfile="$result"

get_mysql_option mysqld socket "$datadir/mysql.sock"

socketfile="$result"

# Absorb configuration settings from the specified systemd service file,

# or the default "mysqld" service if not specified

SERVICE_NAME="$1"

if [ x"$SERVICE_NAME" = x ]

then

    SERVICE_NAME=mysqld.service

fi

myuser=`systemctl show -p User "${SERVICE_NAME}" |

  sed 's/^User=//'`

if [ x"$myuser" = x ]

then

    myuser=mysql

fi

mygroup=`systemctl show -p Group "${SERVICE_NAME}" |

  sed 's/^Group=//'`

if [ x"$mygroup" = x ]

then

    mygroup=mysql

fi

# Set up the errlogfile with appropriate permissions

touch "$errlogfile"

chown "$myuser:$mygroup" "$errlogfile"

chmod 0640 "$errlogfile"

[ -x /sbin/restorecon ] && /sbin/restorecon "$errlogfile"

# We check if there is already a process using the socket file,

# since otherwise this systemd service file could report false

# positive result when starting and mysqld_safe could remove

# a socket file, which actually uses a different daemon.

if fuser "$socketfile" &>/dev/null ; then

    echo "Socket file $socketfile exists." >&2

    echo "Is another MySQL daemon already running with the same unix socket?" >&2

    exit 1

fi

# Make the data directory

if [ ! -d "$datadir/mysql" ] ; then

    # First, make sure $datadir is there with correct permissions

    # (note: if it's not, and we're not root, this'll fail ...)

    if [ ! -e "$datadir" -a ! -h "$datadir" ]

    then

        mkdir -p "$datadir" || exit 1

    fi

    chown "$myuser:$mygroup" "$datadir"

    chmod 0755 "$datadir"

    [ -x /sbin/restorecon ] && /sbin/restorecon "$datadir"

    # Now create the database

    echo "Initializing MySQL database"

    /usr/bin/mysql_install_db --datadir="$datadir" --user="$myuser"

    ret=$?

    if [ $ret -ne 0 ] ; then

        echo "Initialization of MySQL database failed." >&2

        echo "Perhaps /etc/my.cnf is misconfigured." >&2

        # Clean up any partially-created database files

        if [ ! -e "$datadir/mysql/user.frm" ] ; then

            rm -rf "$datadir"/*

        fi

        exit $ret

    fi

    # In case we're running as root, make sure files are owned properly

    chown -R "$myuser:$mygroup" "$datadir"

fi

exit 0