!66 The postun script should distinguish uninstall and upgrade scenarios

From: @BornThisWay 
Reviewed-by: @houmingyong 
Signed-off-by: @houmingyong

linux-sgx.spec

@@ -1,6 +1,6 @@
 Name:           linux-sgx
 Version:        2.15.1
-Release:        7
+Release:        8
 Summary:        Intel(R) Software Guard Extensions for Linux* OS
 ExclusiveArch:	x86_64
 License:        BSD-3-Clause
@@ -887,6 +887,7 @@ echo -e "Installation succeed!"
 systemctl start mpa_registration_tool.service
 
 %postun -n sgx-ra-service
+if [ "$1" = "0" ]; then
     # Generate the script to setup environment variables
     MPA_DST_PATH=/opt/intel/sgx-ra-service
 
@@ -906,6 +907,7 @@ rm -rf $MPA_DST_PATH
 
     #Removing log file
     rm -f /var/log/mpa_registration.log
+fi
 
 echo -e "Uninstallation succeed!"
 
@@ -1030,6 +1032,9 @@ fi
 %files -n libsgx-headers -f %{LINUX_INSTALLER_RPM_DIR}/libsgx-headers/build/list-libsgx-headers
 
 %changelog
+* Sat Sep 24 2022 wangyu <wangyu283@huawei.com> - 2.15.1-8
+- The postun script should distinguish uninstall and upgrade scenarios
+
 * Tue Sep 20 2022 wangyu <wangyu283@huawei.com> - 2.15.1-7
 - add strip compilation option for pck-id-retrieval-tool