#!/bin/sh

# Some useful functions used in other MySQL helper scripts

# This scripts defines variables datadir, errlogfile, socketfile

export LC_ALL=C

# extract value of a MySQL option from config files

# Usage: get_mysql_option VARNAME DEFAULT SECTION [ SECTION, ... ]

# 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(){

	if [ $# -ne 3 ] ; then

		echo "get_mysql_option requires 3 arguments: section option default_value"

		return

	fi

	sections="$1"

	option_name="$2"

	default_value="$3"

	result=`@bindir@/my_print_defaults $sections | sed -n "s/^--${option_name}=//p" | tail -n 1`

	if [ -z "$result" ]; then

	    # not found, use default

	    result="${default_value}"

	fi

}

# Defaults here had better match what mysqld_safe will default to

# The option values are generally defined on three important places

# on the default installation:

#  1) default values are hardcoded in the code of mysqld daemon or

#     mysqld_safe script

#  2) configurable values are defined in @sysconfdir@/my.cnf

#  3) default values for helper scripts are specified bellow

# So, in case values are defined in my.cnf, we need to get that value.

# In case they are not defined in my.cnf, we need to get the same value

# in the daemon, as in the helper scripts. Thus, default values here

# must correspond with values defined in mysqld_safe script and source

# code itself.

server_sections="mysqld_safe mysqld server mysqld-@MAJOR_VERSION@.@MINOR_VERSION@ client-server"

get_mysql_option "$server_sections" datadir "@MYSQL_DATADIR@"

datadir="$result"

# if there is log_error in the my.cnf, my_print_defaults still

# returns log-error

# log-error might be defined in mysqld_safe and mysqld sections,

# the former has bigger priority

get_mysql_option "$server_sections" log-error "$datadir/`hostname`.err"

errlogfile="$result"

get_mysql_option "$server_sections" socket "@MYSQL_UNIX_ADDR@"

socketfile="$result"

get_mysql_option "$server_sections" pid-file "$datadir/`hostname`.pid"

pidfile="$result"