mariadb/mysql-check-socket.sh

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#!/bin/sh
# We check if there is already a process using the socket file,
# since otherwise the systemd service file could report false
# positive result when starting and mysqld_safe could remove
# a socket file, which is actually being used by a different daemon.
source "`dirname ${BASH_SOURCE[0]}`/mysql-scripts-common"
if test -e "$socketfile" ; then
echo "Socket file $socketfile exists." >&2
# no write permissions
if ! test -w "$socketfile" ; then
echo "Not enough permission to write to the socket file $socketfile, which is suspicious." >&2
echo "Please, remove $socketfile manually to start the service." >&2
exit 1
fi
# not a socket file
if ! test -S "$socketfile" ; then
echo "The file $socketfile is not a socket file, which is suspicious." >&2
echo "Please, remove $socketfile manually to start the service." >&2
exit 1
fi
# some process uses the socket file
if fuser "$socketfile" &>/dev/null ; then
socketpid=$(fuser "$socketfile" 2>/dev/null)
echo "Is another MySQL daemon already running with the same unix socket?" >&2
echo "Please, stop the process $socketpid or remove $socketfile manually to start the service." >&2
exit 1
fi
# socket file is a garbage
echo "No process is using $socketfile, which means it is a garbage, so it will be removed automatically." >&2
fi
exit 0