修改 pre 和 postun 中对 mysql 用户的处理逻辑

Signed-off-by: herengui <herengui@uniontech.com>

mysql.spec

@@ -7,7 +7,7 @@
 %global boost_bundled_version 1.73.0
 Name:              mysql
 Version:           8.0.26
-Release:           1
+Release:           2
 License:           GPLv2 with exceptions and LGPLv2 and BSD
 Summary:           The world's most popular open source database
 URL:               http://www.mysql.com/
@@ -74,9 +74,9 @@ cmake . -DCMAKE_INSTALL_PREFIX=/usr/local/mysql -DMYSQL_DATADIR=/data/mysql/data
 rm -rf %{buildroot}
 
 %pre
-if ! id %{name} > /dev/null 2>&1;then
-    useradd -M -s /sbin/nologin %{name}
-fi
+/usr/sbin/groupadd -g 27 -o -r mysql >/dev/null 2>&1 || :
+/usr/sbin/useradd -M -N -g mysql -o -r -d %{_sharedstatedir}/mysql -s /sbin/nologin \
+    -c "MySQL Server" -u 27 mysql >/dev/null 2>&1 || :
 
 %post
 if [ -f %{_prefix}/local/%{name}/support-files/mysql.server > /dev/null 2>&1 ]  && [ ! -f %{_initddir}/mysql > /dev/null 2>&1 ];then
@@ -105,9 +105,6 @@ if [ "$1" = 0 ];then
 fi
 
 %postun
-if [ "$1" = 0 ];then
-    userdel -r %{name} &>/dev/null
-fi
 
 %files
 %dir %{_prefix}/local/%{name}
@@ -116,6 +113,10 @@ fi
 %exclude /usr/lib/debug
 
 %changelog
+* Mon Aug 23 2021 herengui <herengui@uniontech.com> - 8.0.26-2
+- The user mysql should not be deleted when mysql is uninstalled
+  Set the mysql user/group to use a fixed uid/gid 27
+
 * Mon Aug 2 2021 liwu <liwu13@huawei.com> - 8.0.26-1
 - Upgrade mysql to 8.0.26,fix CVES:CVE-2021-2356,CVE-2021-2339,CVE-2021-2354
   CVE-2021-2352,CVE-2021-2340