Merge ea8c6b4b80 into 7a9d0abe4d

Having to deal with a process that fails or doesn't fail depending on
whether there are coredumps or not is incredibly annoying for users.
So let's compromise and not fail if JSON output is enabled and there
are no coredumps.

man/coredumpctl.xml

@@ -391,7 +391,7 @@
     <title>Exit status</title>
     <para>On success, 0 is returned; otherwise, a non-zero failure
     code is returned. Not finding any matching core dumps is treated as
-    failure.
+    failure unless JSON output is enabled.
     </para>
   </refsect1>
 

src/coredump/coredumpctl.c

@@ -965,6 +965,8 @@ static int dump_list(int argc, char **argv, void *userdata) {
                 if (!arg_field && n_found <= 0) {
                         if (!arg_quiet)
                                 log_notice("No coredumps found.");
+
+                        if (!sd_json_format_enabled(arg_json_format_flags))
                                 return -ESRCH;
                 }
         }