test execution does not modify sources

tests/integration/functional/hive_fork_manager/test_extension_update.sh

@@ -68,6 +68,7 @@ test_extension_update() {
     COPY_BUILD_PATH="${HAF_DIR}/src_copy/build"
     rm -rf ${COPY_SRC_PATH}
     mkdir -p ${COPY_SRC_PATH}
+    mkdir -p ${COPY_BUILD_PATH}
 
 
     cp -a ${DIR}/. ${COPY_SRC_PATH}
@@ -85,7 +86,7 @@ test_extension_update() {
     # old libhfm has to be removed so in case of an corrupted setup of haf the old libhfm won't be used
     sudo rm -rf /usr/lib/postgresql/${POSTGRES_VERSION}/lib/libhfm-*
     # modify the hived_api.sql file
-    echo -e "CREATE OR REPLACE FUNCTION hive.test() \n    RETURNS void \n    LANGUAGE plpgsql \n    VOLATILE AS \n\$BODY\$ \nBEGIN \nRAISE NOTICE 'test'; \nEND; \n\$BODY\$;" >> "${COPY_SRC_PATH}/hive_fork_manager/hived_api.sql"
+    echo -e "CREATE OR REPLACE FUNCTION hive.test() \n    RETURNS void \n    LANGUAGE plpgsql \n    VOLATILE AS \n\$BODY\$ \nBEGIN \nRAISE NOTICE 'test'; \nEND; \n\$BODY\$;" >> "${COPY_SRC_PATH}/src/hive_fork_manager/hived_api.sql"
     # commit changes to make a new hash
     git -C ${COPY_BUILD_PATH} config --global user.name "abc"
     git -C ${COPY_BUILD_PATH} config --global user.email "abc@example.com"