Add runtime warning to `stderr` when calling deprecated API

common/utils/deprecate.hpp

@@ -0,0 +1,30 @@
+/*
+Copyright Contributors to the libdnf project.
+
+This file is part of libdnf: https://github.com/rpm-software-management/libdnf/
+
+Libdnf is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation, either version 2.1 of the License, or
+(at your option) any later version.
+
+Libdnf is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with libdnf.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#ifndef LIBDNF5_UTILS_DEPRACATE_HPP
+#define LIBDNF5_UTILS_DEPRACATE_HPP
+
+#include <iostream>
+
+#define LIBDNF5_DEPRECATED(msg)                                                     \
+    {                                                                               \
+        std::cerr << __PRETTY_FUNCTION__ << " is deprecated: " << msg << std::endl; \
+    }
+
+#endif  // LIBDNF5_UTILS_DEPRACATE_HPP

libdnf5/conf/config_main.cpp

@@ -21,6 +21,7 @@ along with libdnf.  If not, see <https://www.gnu.org/licenses/>.
 
 #include "config.h"
 #include "config_utils.hpp"
+#include "utils/deprecate.hpp"
 #include "utils/system.hpp"
 
 #include "libdnf5/common/xdg.hpp"
@@ -475,9 +476,11 @@ const OptionNumber<std::int32_t> & ConfigMain::get_debuglevel_option() const {
 }
 
 OptionNumber<std::int32_t> & ConfigMain::get_errorlevel_option() {
+    LIBDNF5_DEPRECATED("The option does nothing");
     return p_impl->errorlevel;
 }
 const OptionNumber<std::int32_t> & ConfigMain::get_errorlevel_option() const {
+    LIBDNF5_DEPRECATED("The option does nothing");
     return p_impl->errorlevel;
 }
 
@@ -912,9 +915,11 @@ const OptionString & ConfigMain::get_rpmverbosity_option() const {
 }
 
 OptionBool & ConfigMain::get_strict_option() {
+    LIBDNF5_DEPRECATED("Use get_skip_broken_option() and get_skip_unavailable_option()");
     return p_impl->strict;
 }
 const OptionBool & ConfigMain::get_strict_option() const {
+    LIBDNF5_DEPRECATED("Use get_skip_broken_option() const and get_skip_unavailable_option() const");
     return p_impl->strict;
 }
 
@@ -1142,9 +1147,11 @@ const OptionString & ConfigMain::get_password_option() const {
 }
 
 OptionBool & ConfigMain::get_gpgcheck_option() {
+    LIBDNF5_DEPRECATED("Use get_pkg_gpgcheck_option()");
     return p_impl->pkg_gpgcheck;
 }
 const OptionBool & ConfigMain::get_gpgcheck_option() const {
+    LIBDNF5_DEPRECATED("Use get_pkg_gpgcheck_option() const");
     return p_impl->pkg_gpgcheck;
 }
 

libdnf5/repo/config_repo.cpp

@@ -20,6 +20,7 @@ along with libdnf.  If not, see <https://www.gnu.org/licenses/>.
 #include "libdnf5/repo/config_repo.hpp"
 
 #include "conf/config_utils.hpp"
+#include "utils/deprecate.hpp"
 
 #include "libdnf5/conf/const.hpp"
 #include "libdnf5/utils/bgettext/bgettext-mark-domain.h"
@@ -324,9 +325,11 @@ const OptionChild<OptionStringAppendList> & ConfigRepo::get_protected_packages_o
 }
 
 OptionChild<OptionBool> & ConfigRepo::get_gpgcheck_option() {
+    LIBDNF5_DEPRECATED("Use get_pkg_gpgcheck_option()");
     return p_impl->pkg_gpgcheck;
 }
 const OptionChild<OptionBool> & ConfigRepo::get_gpgcheck_option() const {
+    LIBDNF5_DEPRECATED("Use get_pkg_gpgcheck_option() const");
     return p_impl->pkg_gpgcheck;
 }
 

libdnf5/repo/repo_sack.cpp

@@ -31,6 +31,7 @@ along with libdnf.  If not, see <https://www.gnu.org/licenses/>.
 #include "solv/solver.hpp"
 #include "solv_repo.hpp"
 #include "utils/auth.hpp"
+#include "utils/deprecate.hpp"
 #include "utils/fs/utils.hpp"
 #include "utils/on_scope_exit.hpp"
 #include "utils/string.hpp"
@@ -607,6 +608,7 @@ void RepoSack::Impl::update_and_load_repos(libdnf5::repo::RepoQuery & repos, boo
 
 
 void RepoSack::update_and_load_enabled_repos(bool load_system) {
+    LIBDNF5_DEPRECATED("Use load_repos() which allows specifying repo type.");
     if (load_system) {
         load_repos();
     } else {