Use signal to flush logs when rotating

Using signals has a benefit over mysqladmin call that we don't need to care about password if root has some.

Related: https://issues.redhat.com/browse/RHEL-5470

mysql-flush-logrotate.patch

@@ -0,0 +1,17 @@
+diff -up mysql-8.0.35/support-files/mysql-log-rotate.in.origf mysql-8.0.35/support-files/mysql-log-rotate.in
+--- mysql-8.0.35/support-files/mysql-log-rotate.in.origf	2024-01-29 23:00:32.043257515 +0100
++++ mysql-8.0.35/support-files/mysql-log-rotate.in	2024-01-29 23:02:26.520440388 +0100
+@@ -49,11 +49,7 @@
+         missingok
+         compress
+     postrotate
+-	# just if mysqld is really running
+-	if test -x @bindir@/mysqladmin && \
+-	   @bindir@/mysqladmin ping &>/dev/null
+-	then
+-	   @bindir@/mysqladmin flush-logs
+-	fi
++	# SIGUSR1 makes the daemon to flush the logs, no need to connect
++	@bindir@/kill -USR1 $(systemctl show --property MainPID --value mysqld)
+     endscript
+ }

mysql8.0.spec

@@ -78,7 +78,7 @@
 
 Name:             mysql8.0
 Version:          8.0.36
-Release:          1%{?with_debug:.debug}%{?dist}
+Release:          2%{?with_debug:.debug}%{?dist}
 Summary:          MySQL client programs and shared libraries
 URL:              http://www.mysql.com
 
@@ -121,6 +121,7 @@ Patch52:          %{pkgnamepatch}-rpath.patch
 Patch53:          %{pkgnamepatch}-mtr.patch
 Patch54:          %{pkgnamepatch}-arm32-timer.patch
 Patch55:	  %{pkgnamepatch}-c99.patch
+Patch56:          %{pkgnamepatch}-flush-logrotate.patch
 
 # Patches taken from boost 1.59
 Patch111:         boost-1.58.0-pool.patch
@@ -394,6 +395,7 @@ the MySQL sources.
 %patch -P53 -p1
 %patch -P54 -p1
 %patch -P55 -p1
+%patch -P56 -p1
 
 # Patch Boost
 pushd boost/boost_$(echo %{boost_bundled_version}| tr . _)
@@ -994,6 +996,9 @@ fi
 %endif
 
 %changelog
+* Wed Jan 31 2024 Honza Horak <hhorak@redhat.com> - 8.0.36-2
+- Use signal to flush logs when rotating
+
 * Wed Jan 31 2024 Lukas Javorsky <ljavorsk@redhat.com> - 8.0.36-1
 - Rebase to version 8.0.36