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mariadb: Do not use mysqladmin in init

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Rewrite init script as mysqladmin requires access to the MySQL which is
hard to guarantee. Use standard signals instead.

Signed-off-by: Michal Hrusecky <michal.hrusecky@turris.com>
This commit is contained in:
Michal Hrusecky 2020-10-12 12:52:42 +02:00
parent 7c628580a6
commit a01637ddf0
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GPG key ID: 7B7562FE6F4D91EF
1 changed files with 34 additions and 18 deletions
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52
utils/mariadb/files/mysqld.init
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@ -11,10 +11,11 @@ NAME=mysqld
LOGGER="/usr/bin/logger -p user.err -s -t $NAME --"
[ -x "$LOGGER" ] || LOGGER="echo"
MYSQLADMIN="/usr/bin/mysqladmin"
MYSQLD="/usr/bin/$NAME"
MYSQLDSAFE="/usr/bin/mysqld_safe"
pidfile=""
# mysqladmin likes to read /root/.my.cnf which could cause issues.
export HOME="/etc/mysql"
@ -22,31 +23,39 @@ export HOME="/etc/mysql"
cd /
mysqld_get_param() {
/usr/bin/mysqld --help --verbose | sed -n 's|^'"$1"'[[:blank:]]\+||p'
"$MYSQLD" --help --verbose | sed -n 's|^'"$1"'[[:blank:]]\+||p'
}
# Send kill signal to MariaDB process
#
# Usage: boolean mysqld_kill signal
mysql_kill() {
[ -n "$pidfile" ] || pidfile="$(mysqld_get_param pid-file)"
[ -f "$pidfile" ] || return 1
pid="$(cat $pidfile)"
[ -n "$pid" ] || return 2
kill "$1" "$pid"
}
# Checks if a server is running and accessible.
#
# check_alive insists on a pingable server
# check_dead also fails if there is a lost mysqld in the process list
# Supported modes are 'check_alive' and 'check_dead'.
# Both check for pidfile and whether the specified process is running and is
# indeed mysqld. We could use mysqladmin for the check, but to be able to do
# so, mysqladmin requires access to the database, which sounds like overkill
# and potential security issue.
#
# Usage: boolean mysqld_status [check_alive|check_dead]
mysqld_status() {
if $MYSQLADMIN ping >/dev/null 2>&1; then
ping_alive=1
else
ping_alive=0
fi
ps_alive=0
pidfile="$(mysqld_get_param pid-file)"
if [ -f "$pidfile" ] && kill -0 "$(cat "$pidfile")" >/dev/null 2>&1; then
if [ -f "$pidfile" ] && mysql_kill -0 2> /dev/null && \
[ "$(readlink "/proc/$(cat "$pidfile")/exe")" = "$MYSQLD" ]; then
ps_alive=1
fi
if { [ "$1" = check_alive ] && [ $ping_alive = 1 ]; } || \
{ [ "$1" = check_dead ] && [ $ping_alive = 0 ] \
&& [ $ps_alive = 0 ]; }
if { [ "$1" = check_alive ] && [ $ps_alive = 1 ]; } || \
{ [ "$1" = check_dead ] && [ $ps_alive = 0 ]; }
then
return 0 # EXIT_SUCCESS
else
@ -60,8 +69,8 @@ start() {
rundir=/var/run/mysqld
hint="please fix your server configuration in /etc/mysql/"
for i in "$MYSQLD" "$MYSQLADMIN" "$MYSQLDSAFE"; do
for i in "$MYSQLD" "$MYSQLDSAFE"; do
if [ ! -x "$i" ]; then
$LOGGER "$i is missing"
exit 1
@ -133,14 +142,21 @@ start() {
}
stop() {
timeout="0"
while mysqld_status check_alive && [ "$timeout" -lt 60 ]; do
mysql_kill -TERM
sleep 1
timeout="$(($timeout + 1))"
done
if ! mysqld_status check_dead; then
"$MYSQLADMIN" shutdown
$LOGGER "server is failing to stop"
mysql_kill -KILL
fi
}
reload() {
if mysqld_status check_alive; then
"$MYSQLADMIN" reload
mysql_kill -HUP
else
$LOGGER "server is not running"
fi