Bug#24619033 - UNABLE TO START MYSQLD DUE TO CHANGES IN

MYSQLD_SAFE

DESCRIPTION
===========
Starting a mysql server by running init script:
/etc/init.d/mysqld start

is failing. This is happening after the changes done in
script 'mysqld_safe' as a patch to Bug#24464380.

ANALYSIS
========
Say customer's /etc/my.cnf has following content:

[mysqld_safe]
.
.
ledir  = /mysqld_ledir
mysqld = mysqld_wrapper

Patch to Bug#24464380 prohibits using "mysqld" (and few
other variables) in config file due to privilege reasons.
Since mysqld init scripts internally calls 'mysqld_safe'
script, the existing configuration has started failing.

FIX
===
In the init script, we now pass MYSQLD_OPTS as the first
argument (expected to be read from /etc/sysconfig/mysqld)
to mysqld_safe command. This new variable can have all the
mysqld_safe's special options as a string containing command
line arguments. For example:

MYSQLD_OPTS=" --ledir=/mysqld_ledir --mysqld=my_wrapper "

NOTE TO THE DOCUMENTATION TEAM
==============================
As mentioned above, the prohibited variables have to be
moved from /etc/my.cnf to /etc/sysconfig/mysqld as a string
containing command-line arguments in the form of variable
MYSQLD_OPTS. We can pass mysqld options as well in this new
variable which would be further passed to mysqld process.

packaging/rpm-oel/mysql.init

@@ -23,6 +23,9 @@ prog="mysqld"
 STARTTIMEOUT=120
 STOPTIMEOUT=60
 
+# Set in /etc/sysconfig/mysqld, will be passed to mysqld_safe
+MYSQLD_OPTS=
+
 [ -e /etc/sysconfig/$prog ] && . /etc/sysconfig/$prog
 
 lockfile=/var/lock/subsys/$prog
@@ -110,7 +113,7 @@ start(){
 	# and some users might prefer to configure logging to syslog.)
 	# Note: set --basedir to prevent probes that might trigger SELinux
 	# alarms, per bug #547485
-	$exec   --datadir="$datadir" --socket="$socketfile" \
+	$exec $MYSQLD_OPTS --datadir="$datadir" --socket="$socketfile" \
 		--pid-file="$mypidfile" \
 		--basedir=/usr --user=mysql >/dev/null &
 	safe_pid=$!