mariadb/mysql-systemd-helper

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#!/bin/bash
die() {
echo "$1"
exit 1
}
# Read options from config file
read_config() {
# Initial settings
MYSQLVER="$(echo @MYSQLVER@ | sed 's|\.[0-9]\+$||')"
mysql_daemon_user=mysql
mysql_daemon_group=mysql
# status information directory (e.g. info about a necessity of upgrade, current version etc)
mariadb_status_dir="/var/lib/misc"
if [[ -z "$INSTANCE" ]]; then
datadir=/var/lib/mysql
socket="/run/mysql/mysql.sock"
else
datadir="/var/lib/mysql-$INSTANCE"
socket="/run/mysql/mysql.${INSTANCE}.sock"
fi
# Read options - important for multi setup
if [[ -n "$INSTANCE" ]]; then
opts="$(/usr/bin/my_print_defaults --defaults-extra-file=/etc/my${INSTANCE}.cnf mysqld mysqld_multi "$INSTANCE")"
tmp_opts="$opts"
config="/etc/my${INSTANCE}.cnf"
else
opts="$(/usr/bin/my_print_defaults mysqld)"
tmp_opts="$opts"
config="/etc/my.cnf"
fi
# Update local variables according to the settings from config
for arg in $tmp_opts; do
case "$arg" in
--basedir=*) basedir="$(echo "$arg" | sed -e 's/^[^=]*=//')" ;;
--socket=*) socket="$(echo "$arg" | sed -e 's/^[^=]*=//')" ;;
--datadir=*) datadir="$(echo "$arg" | sed -e 's/^[^=]*=//')" ;;
--user=*) mysql_daemon_user="$(echo "$arg" | sed -e 's/^[^=]*=//')" ;;
--group=*) mysql_daemon_group="$(echo "$arg" | sed -e 's/^[^=]*=//')" ;;
esac
done
# work-around for lost+found directory in $datadir (bug #986251)
if [ -d "$datadir/lost+found" ]
then
ignore_db_dir="--ignore-db-dir=lost+found"
else
ignore_db_dir=""
fi
}
# Create new empty database if needed
mysql_install() {
if [[ ! -d "$datadir/mysql" ]]; then
echo "Creating MySQL privilege database... "
mysql_install_db --rpm --user="$mysql_daemon_user" --datadir="$datadir" || \
die "Creation of MySQL database in $datadir failed"
echo -n "$MYSQLVER" > "$mariadb_status_dir"/mariadb_upgrade_info
fi
}
# Upgrade database if needed
mysql_upgrade() {
# Run mysql_upgrade on every package install/upgrade. Not always
# necessary, but doesn't do any harm.
if [[ -f "$mariadb_status_dir/.mariadb_run_upgrade" ]]; then
echo "Checking MySQL configuration for obsolete options..."
sed -i -e 's|^\([[:blank:]]*\)skip-locking|\1skip-external-locking|' \
-e 's|^\([[:blank:]]*skip-federated\)|#\1|' /etc/my.cnf
# instead of running mysqld --bootstrap, which wouldn't allow
# us to run mysql_upgrade, we start a full-featured server with
# --skip-grant-tables and restict access to it by unix
# permissions of the named socket
echo "Trying to run upgrade of MySQL databases..."
# Check whether upgrade process is not already running
protected="$(cat "/run/mysql/protecteddir.$INSTANCE" 2> /dev/null)"
if [[ -n "$protected" && -d "$protected" ]]; then
pid="$(cat "$protected/mysqld.pid" 2> /dev/null)"
if [[ "$pid" && -d "/proc/$pid" ]] &&
[[ $(readlink "/proc/$pid/exe" | grep -q "mysql") ]]; then
die "Another upgrade in already in progress!"
else
echo "Stale files from previous upgrade detected, cleaned them up"
rm -rf "$protected"
rm -f "/run/mysql/protecteddir.$INSTANCE"
fi
fi
protected="$(mktemp -d -p /var/tmp mysql-protected.XXXXXX | tee "/run/mysql/protecteddir.$INSTANCE")"
[ -n "$protected" ] || die "Can't create a tmp dir '$protected'"
# Create a secure tmp dir
chown --no-dereference "$mysql_daemon_user:$mysql_daemon_group" "$protected" || die "Failed to set group/user to '$protected'"
chmod 0700 "$protected" || die "Failed to set permissions to '$protected'"
# Run protected MySQL accessible only though socket in our directory
echo "Running protected MySQL... "
/usr/sbin/mysqld \
--defaults-file="$config" \
--user="$mysql_daemon_user" \
--skip-networking \
--skip-grant-tables \
$ignore_db_dir \
--log-error="$protected/log_upgrade_run" \
--socket="$protected/mysql.sock" \
--pid-file="$protected/mysqld.pid" &
mysql_wait "$protected/mysql.sock" || die "MySQL didn't start, can't continue"
# Run upgrade itself
echo "Running upgrade itself..."
echo "It will do some chek first and report all errors and tries to correct them"
echo
if /usr/bin/mysql_upgrade --no-defaults --force --socket="$protected/mysql.sock"; then
echo "Everything upgraded successfully"
up_ok=""
rm -f "$mariadb_status_dir/.mariadb_run_upgrade"
[[ $(grep -q "^$MYSQLVER" "$mariadb_status_dir/mariadb_upgrade_info" 2> /dev/null) ]] || \
echo -n "$MYSQLVER" > "$mariadb_status_dir/mariadb_upgrade_info"
else
echo "Upgrade failed"
up_ok="false"
fi
# Shut down MySQL
echo "Shutting down protected MySQL"
protected_pid=$(cat "$protected/mysqld.pid")
kill $protected_pid
for i in {1..30}; do
/usr/bin/mysqladmin --socket="$protected/mysql.sock" ping > /dev/null 2>&1
# Check both ping response and the pid in a process list as it can take some time till the process is terminated.
# Otherwise it can lead to "found left-over process" situation when regular mariadb is started.
if [[ $? -eq 1 ]] && ! ps -p $protected_pid > /dev/null 2>&1; then
break
fi
sleep 1
done
/usr/bin/mysqladmin --socket="$protected/mysql.sock" ping > /dev/null 2>&1 && kill -9 $protected_pid
# Cleanup
echo "Final cleanup"
if [[ -z "$up_ok" ]]; then
rm -rf "$protected" "/run/mysql/protecteddir.$INSTANCE"
else
die "Something failed during upgrade, please check logs"
fi
fi
}
mysql_wait() {
[[ -z "$1" ]] || socket="$1"
echo "Waiting for MySQL to start"
for i in {1..60}; do
/usr/bin/mysqladmin --socket="$socket" ping > /dev/null 2>&1 && break
sleep 1
done
if /usr/bin/mysqladmin --socket="$socket" ping > /dev/null 2>&1; then
echo "MySQL is alive"
return 0
else
echo "MySQL is still dead"
return 1
fi
}
mysql_start() {
exec /usr/sbin/mysqld \
--defaults-file="$config" \
$ignore_db_dir \
--user="$mysql_daemon_user" \
--socket="$socket"
}
# We rely on output in english at some points
LC_ALL=C
INSTANCE="$2"
read_config
# Make sure that /run/mysql is created and has correct permissions (bsc#1038740)
systemd-tmpfiles --create /usr/lib/tmpfiles.d/mariadb.conf
case "$1" in
install)
mysql_install ;;
upgrade)
mysql_upgrade ;;
start)
mysql_start ;;
wait)
mysql_wait ;;
*)
echo "Supported commands are:"
echo " install - creates empty database if needed"
echo " upgrade - tries to migrate data to newer version if needed"
echo " start - tries to start instance"
echo " wait - waits till instance is pingable"
echo "All commands can take extra argument which is group from 'mysqld_multi' you want to work with"
;;
esac