fix %postun problem

mysql.spec

@@ -6,7 +6,7 @@
 
 Name:              mysql
 Version:           8.0.17
-Release:           3
+Release:           4
 License:           GPLv2
 Summary:           The world's most popular open source database
 URL:               http://www.mysql.com/
@@ -71,8 +71,10 @@ if [ -f %{_initddir}/mysql ];then
 fi
 
 %postun
-rm -rf %{_prefix}/local/%{name}
-userdel -r %{name} &>/dev/null
+if ["$1" = "0"]; then
+      rm -rf %{_prefix}/local/%{name}
+      userdel -r %{name} &>/dev/null
+fi
 
 %files
 %attr(755, %{name}, %{name}) %{_prefix}/local/%{name}/*
@@ -80,6 +82,9 @@ userdel -r %{name} &>/dev/null
 %exclude /usr/lib/debug
 
 %changelog
+* Tue Jun 16 2020 wutao <wutao61@huawei.com> - 8.0.17-4
+- fix %postun problem
+
 * Wed Mar 1 2020 zhangtao<zhangtao221@huawei.com> 8.0.17-3
 - add fstack-protector-strong
 * Fri Feb 28 2020 catastrowings <jianghuhao1994@163.com> 8.0.17-2