vars: Ignore unreadable vars files.

If there is an item in the vars directory that is either inaccessible
(e.g. permission denied) or cannot be read from (e.g. a directory),
skip this item and write a warning to the log.

libdnf5/conf/vars.cpp

@@ -22,6 +22,7 @@ along with libdnf. If not, see <https://www.gnu.org/licenses/>.
 #include "rpm/rpm_log_guard.hpp"
 #include "utils/fs/file.hpp"
 
+#include "libdnf5/base/base.hpp"
 #include "libdnf5/common/exception.hpp"
 #include "libdnf5/utils/bgettext/bgettext-mark-domain.h"
 
@@ -297,6 +298,7 @@ static void dir_close(DIR * d) {
 }
 
 void Vars::load_from_dir(const std::string & directory) {
+ auto & logger = *base->get_logger();
  if (DIR * dir = opendir(directory.c_str())) {
  std::unique_ptr<DIR, decltype(&dir_close)> dir_guard(dir, &dir_close);
  while (auto ent = readdir(dir)) {
@@ -310,9 +312,14 @@ void Vars::load_from_dir(const std::string & directory) {
  }
  full_path += dname;
 
- utils::fs::File file(full_path, "r");
  std::string line;
- file.read_line(line);
+ try {
+ utils::fs::File file(full_path, "r");
+ file.read_line(line);
+ } catch (const std::filesystem::filesystem_error & e) {
+ logger.warning("Cannot load variable from file \"{}\": {}", full_path.c_str(), e.what());
+ continue;
+ }
  set(dname, line, Priority::VARSDIR);
  }
  }