#!/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=`/usr/bin/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 /etc/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 mariadb"

get_mysql_option "$server_sections" datadir "/var/lib/mysql"
datadir="$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 "$server_sections" log-error "`hostname`.err"
errlogfile="$result"

get_mysql_option "$server_sections" socket "/var/lib/mysql/mysql.sock"
socketfile="$result"

get_mysql_option "$server_sections" pid-file "`hostname`.pid"
pidfile="$result"