automatic: Enhance errors reporting

Emitters must be initialized early to ensure they can report errors that
might occur in earlier stages of execution, before transaction
resolution. Also a broader range of exceptions must be caught to
ensure they are communicated to the user through the configured
emitters.
For example "No space left on the device" error can be raised during the
fill_sack() call. This patch should report it via configured emitters.

Resolves: https://issues.redhat.com/browse/RHEL-61882

dnf/automatic/main.py

@@ -311,11 +311,13 @@ def remote_address(url_list):
 
 def main(args):
     (opts, parser) = parse_arguments(args)
+    conf = None
+    emitters = None
 
     try:
         conf = AutomaticConfig(opts.conf_path, opts.downloadupdates,
                                opts.installupdates)
-        emitters = None
+        emitters = build_emitters(conf)
         with dnf.Base() as base:
             cli = dnf.cli.Cli(base)
             cli._read_conf_file()
@@ -349,7 +351,6 @@ def main(args):
                 return 0
 
             lst = output.list_transaction(trans, total_width=80)
-            emitters = build_emitters(conf)
             emitters.notify_available(lst)
             if not conf.commands.download_updates:
                 emitters.commit()
@@ -378,9 +379,9 @@ def main(args):
                 exit_code = os.waitstatus_to_exitcode(os.system(conf.commands.reboot_command))
                 if exit_code != 0:
                     raise dnf.exceptions.Error('reboot command returned nonzero exit code: %d', exit_code)
-    except dnf.exceptions.Error as exc:
+    except Exception as exc:
         logger.error(_('Error: %s'), ucd(exc))
-        if conf.emitters.send_error_messages and emitters != None:
+        if conf is not None and conf.emitters.send_error_messages and emitters is not None:
             emitters.notify_error(_('Error: %s') % str(exc))
             emitters.commit()
         return 1