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#!/bin/sh
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# Some useful functions used in other MySQL helper scripts
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# This scripts defines variables datadir, errlogfile, socketfile
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export LC_ALL=C
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# extract value of a MySQL option from config files
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# Usage: get_mysql_option VARNAME DEFAULT SECTION [ SECTION, ... ]
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# result is returned in $result
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# We use my_print_defaults which prints all options from multiple files,
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# with the more specific ones later; hence take the last match.
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get_mysql_option(){
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if [ $# -ne 3 ] ; then
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echo "get_mysql_option requires 3 arguments: section option default_value"
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return
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fi
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sections="$1"
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option_name="$2"
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default_value="$3"
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result=`@bindir@/my_print_defaults $my_print_defaults_extra_args $sections | sed -n "s/^--${option_name}=//p" | tail -n 1`
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if [ -z "$result" ]; then
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# not found, use default
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result="${default_value}"
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fi
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}
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# For the case of running more instances via systemd, scrits that source
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# this file can get --default-group-suffix or similar option as the first
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# argument. The utility my_print_defaults needs to use it as well, so the
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# scripts sourcing this file work with the same options as the daemon.
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my_print_defaults_extra_args=''
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while echo "$1" | grep -q '^--defaults' ; do
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my_print_defaults_extra_args="${my_print_defaults_extra_args} $1"
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shift
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done
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# Defaults here had better match what mysqld_safe will default to
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# The option values are generally defined on three important places
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# on the default installation:
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# 1) default values are hardcoded in the code of mysqld daemon or
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# mysqld_safe script
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# 2) configurable values are defined in @sysconfdir@/my.cnf
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# 3) default values for helper scripts are specified bellow
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# So, in case values are defined in my.cnf, we need to get that value.
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# In case they are not defined in my.cnf, we need to get the same value
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# in the daemon, as in the helper scripts. Thus, default values here
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# must correspond with values defined in mysqld_safe script and source
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# code itself.
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server_sections="mysqld_safe mysqld server mysqld-@MAJOR_VERSION@.@MINOR_VERSION@ client-server"
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get_mysql_option "$server_sections" datadir "@MYSQL_DATADIR@"
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datadir="$result"
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# if there is log_error in the my.cnf, my_print_defaults still
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# returns log-error
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# log-error might be defined in mysqld_safe and mysqld sections,
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# the former has bigger priority
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get_mysql_option "$server_sections" log-error "$datadir/`hostname`.err"
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errlogfile="$result"
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get_mysql_option "$server_sections" socket "@MYSQL_UNIX_ADDR@"
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socketfile="$result"
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get_mysql_option "$server_sections" pid-file "$datadir/`hostname`.pid"
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pidfile="$result"
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