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Editing: K01mysql

#!/bin/bash
#
### BEGIN INIT INFO
# Provides:          mysql
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Should-Start:      $network $time
# Should-Stop:       $network $time
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start and stop the mysql database server daemon
# Description:       Controls the main MySQL database server daemon "mysqld"
#                    and its wrapper script "mysqld_safe".
### END INIT INFO
#
set -e
set -u
${DEBIAN_SCRIPT_DEBUG:+ set -v -x}

test -x /usr/bin/mysqld_safe || exit 0

. /lib/lsb/init-functions

SELF=$(cd $(dirname $0); pwd -P)/$(basename $0)
CONF=/etc/mysql/my.cnf
MYADMIN="/usr/bin/mysqladmin --defaults-file=/etc/mysql/debian.cnf"

# priority can be overriden and "-s" adds output to stderr
ERR_LOGGER="logger -p daemon.err -t /etc/init.d/mysql -i"

# Safeguard (relative paths, core dumps..)
cd /
umask 077

# mysqladmin likes to read /root/.my.cnf. This is usually not what I want
# as many admins e.g. only store a password without a username there and
# so break my scripts.
export HOME=/etc/mysql/

## Fetch a particular option from mysql's invocation.
#
# Usage: void mysqld_get_param option
mysqld_get_param() {
	/usr/sbin/mysqld --print-defaults \
		| tr " " "\n" \
		| grep -- "--$1" \
		| tail -n 1 \
		| cut -d= -f2
}

## Do some sanity checks before even trying to start mysqld.
sanity_checks() {
  # check for config file
  if [ ! -r /etc/mysql/my.cnf ]; then
    log_warning_msg "$0: WARNING: /etc/mysql/my.cnf cannot be read. See README.Debian.gz"
    echo                "WARNING: /etc/mysql/my.cnf cannot be read. See README.Debian.gz" | $ERR_LOGGER
  fi

# check for diskspace shortage
  datadir=`mysqld_get_param datadir`
  if LC_ALL=C BLOCKSIZE= df --portability $datadir/. | tail -n 1 | awk '{ exit ($4>4096) }'; then
    log_failure_msg "$0: ERROR: The partition with $datadir is too full!"
    echo                "ERROR: The partition with $datadir is too full!" | $ERR_LOGGER
    exit 1
  fi
}

## Checks if there is a server running and if so if it is accessible.
#
# check_alive insists on a pingable server
# check_dead also fails if there is a lost mysqld in the process list
#
# Usage: boolean mysqld_status [check_alive|check_dead] [warn|nowarn]
mysqld_status () {
    ping_output=`$MYADMIN ping 2>&1`; ping_alive=$(( ! $? ))

ps_alive=0
    pidfile=`mysqld_get_param pid-file`
    if [ -f "$pidfile" ] && ps `cat $pidfile` >/dev/null 2>&1; then ps_alive=1; fi
    
    if [ "$1" = "check_alive"  -a  $ping_alive = 1 ] ||
       [ "$1" = "check_dead"   -a  $ping_alive = 0  -a  $ps_alive = 0 ]; then
	return 0 # EXIT_SUCCESS
    else
  	if [ "$2" = "warn" ]; then
  	    echo -e "$ps_alive processes alive and '$MYADMIN ping' resulted in\n$ping_output\n" | $ERR_LOGGER -p daemon.debug
	fi
  	return 1 # EXIT_FAILURE
    fi
}

#
# main()
#

case "${1:-''}" in
  'start')
	sanity_checks;
	# Start daemon
	log_daemon_msg "Starting MySQL database server" "mysqld"
	if mysqld_status check_alive nowarn; then
	   log_progress_msg "already running"
	   log_end_msg 0
	else
	    # Could be removed during boot
	    test -e /var/run/mysqld || install -m 755 -o mysql -g root -d /var/run/mysqld

# Start MySQL! 
  	    su - mysql -s /bin/sh -c "/usr/bin/mysqld_safe > /dev/null 2>&1 &"

# 6s was reported in #352070 to be too few when using ndbcluster
	    # 14s was reported in #736452 to be too few with large installs
	    for i in $(seq 1 30); do
                sleep 1
	        if mysqld_status check_alive nowarn ; then break; fi
		log_progress_msg "."
	    done
	    if mysqld_status check_alive warn; then
                log_end_msg 0
	        # Now start mysqlcheck or whatever the admin wants.
	        output=$(/etc/mysql/debian-start)
		[ -n "$output" ] && log_action_msg "$output"
	    else
	        log_end_msg 1
		log_failure_msg "Please take a look at the syslog"
	    fi
	fi
	;;

'stop')
	# * As a passwordless mysqladmin (e.g. via ~/.my.cnf) must be possible
	# at least for cron, we can rely on it here, too. (although we have 
	# to specify it explicit as e.g. sudo environments points to the normal
	# users home and not /root)
	log_daemon_msg "Stopping MySQL database server" "mysqld"
	if ! mysqld_status check_dead nowarn; then
	  set +e
	  shutdown_out=`$MYADMIN shutdown 2>&1`; r=$?
	  set -e
	  if [ "$r" -ne 0 ]; then
	    log_end_msg 1
	    [ "$VERBOSE" != "no" ] && log_failure_msg "Error: $shutdown_out"
	    log_daemon_msg "Killing MySQL database server by signal" "mysqld"
	    killall -15 mysqld
            server_down=
	    for i in 1 2 3 4 5 6 7 8 9 10; do
              sleep 1
              if mysqld_status check_dead nowarn; then server_down=1; break; fi
            done
          if test -z "$server_down"; then killall -9 mysqld; fi
	  fi
        fi

if ! mysqld_status check_dead warn; then
	  log_end_msg 1
	  log_failure_msg "Please stop MySQL manually and read /usr/share/doc/mysql-server-5.7/README.Debian.gz!"
	  exit -1
	else
	  log_end_msg 0
        fi
	;;

'restart')
	set +e; $SELF stop; set -e
	$SELF start 
	;;

'reload'|'force-reload')
  	log_daemon_msg "Reloading MySQL database server" "mysqld"
	$MYADMIN reload
	log_end_msg 0
	;;

'status')
	if mysqld_status check_alive nowarn; then
	  log_action_msg "$($MYADMIN version)"
	else
	  log_action_msg "MySQL is stopped."
	  exit 3
	fi
  	;;

# Some success paths end up returning non-zero so exit 0 explicitly. See
# bug #739846.
exit 0

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