Fix handling of log_rotate_size: infinity

This should fix issue reported in #3462

ejabberdctl.template

@@ -87,7 +87,7 @@ ERL_INETRC="$ETC_DIR"/inetrc
 
 # define ejabberd parameters
 EJABBERD_OPTS="$EJABBERD_OPTS\
-$(sed '/^log_rotate_size/!d;s/:[ \t]*\([0-9]*\).*/ \1/;s/^/ /' "$EJABBERD_CONFIG_PATH")\
+$(sed '/^log_rotate_size/!d;s/:[ \t]*\([0-9]\{1,\}\).*/ \1/;s/:[ \t]*\(infinity\).*/ \1/;s/^/ /' "$EJABBERD_CONFIG_PATH")\
 $(sed '/^log_rotate_count/!d;s/:[ \t]*\([0-9]*\).*/ \1/;s/^/ /' "$EJABBERD_CONFIG_PATH")"
 [ -n "$EJABBERD_OPTS" ] && EJABBERD_OPTS="-ejabberd $EJABBERD_OPTS"
 EJABBERD_OPTS="-mnesia dir \"$SPOOL_DIR\" $MNESIA_OPTIONS $EJABBERD_OPTS -s ejabberd"

src/ejabberd_logger.erl

@@ -81,6 +81,8 @@ get_integer_env(Name, Default) ->
     case application:get_env(ejabberd, Name) of
         {ok, I} when is_integer(I), I>=0 ->
             I;
+        {ok, infinity} ->
+            infinity;
         undefined ->
             Default;
         {ok, Junk} ->
@@ -142,7 +144,10 @@ do_start(Level) ->
     ErrorLog = filename:join([Dir, "error.log"]),
     CrashLog = filename:join([Dir, "crash.log"]),
     LogRotateDate = get_string_env(log_rotate_date, ""),
-    LogRotateSize = get_integer_env(log_rotate_size, 10*1024*1024),
+    LogRotateSize = case get_integer_env(log_rotate_size, 10*1024*1024) of
+                        infinity -> 0;
+                        V -> V
+                    end,
     LogRotateCount = get_integer_env(log_rotate_count, 1),
     LogRateLimit = get_integer_env(log_rate_limit, 100),
     ConsoleLevel = case get_lager_version() >= "3.6.0" of