mariadb/mariadb-scripts-common

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#!/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.
get_mysql_option mysqld datadir "/var/lib/mysql"
datadir="$result"
# if there is log_error in the my.cnf, my_print_defaults still
# returns log-error
# log-error might be defined in mysqld_safe and mysqld sections,
# the former has bigger priority
get_mysql_option "mysqld_safe mysqld" log-error "`hostname`.err"
errlogfile="$result"
get_mysql_option mysqld socket "/var/lib/mysql/mysql.sock"
socketfile="$result"
get_mysql_option mysqld_safe pid-file "`hostname`.pid"
pidfile="$result"