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#!/bin/sh
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# This script waits for mysqld to be ready to accept connections
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# (which can be many seconds or even minutes after launch, if there's
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# a lot of crash-recovery work to do).
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# Running this as ExecStartPost is useful so that services declared as
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# "After mysqld" won't be started until the database is really ready.
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# Service file passes us the daemon's PID (actually, mysqld_safe's PID)
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daemon_pid="$1"
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# extract value of a MySQL option from config files
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# Usage: get_mysql_option SECTION VARNAME DEFAULT
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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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result=`/usr/bin/my_print_defaults "$1" | sed -n "s/^--$2=//p" | tail -n 1`
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if [ -z "$result" ]; then
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# not found, use default
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result="$3"
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fi
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}
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# Defaults here had better match what mysqld_safe will default to
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get_mysql_option mysqld datadir "/var/lib/mysql"
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datadir="$result"
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get_mysql_option mysqld socket "/var/lib/mysql/mysql.sock"
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socketfile="$result"
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# Wait for the server to come up or for the mysqld process to disappear
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ret=0
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while /bin/true; do
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RESPONSE=`/usr/bin/mysqladmin --no-defaults --socket="$socketfile" --user=UNKNOWN_MYSQL_USER ping 2>&1`
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mret=$?
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if [ $mret -eq 0 ]; then
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break
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fi
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# exit codes 1, 11 (EXIT_CANNOT_CONNECT_TO_SERVICE) are expected,
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# anything else suggests a configuration error
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if [ $mret -ne 1 -a $mret -ne 11 ]; then
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ret=1
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break
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fi
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# "Access denied" also means the server is alive
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echo "$RESPONSE" | grep -q "Access denied for user" && break
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# Check process still exists
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if ! /bin/kill -0 $daemon_pid 2>/dev/null; then
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ret=1
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break
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fi
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sleep 1
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done
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exit $ret
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