log: only allow new roller related options in a block

fix issue #1529
Signed-off-by: Tw <tw19881113@gmail.com>

caddyhttp/log/setup.go

@@ -41,12 +41,13 @@ func logParse(c *caddy.Controller) ([]*Rule, error) {
 			}
 			where := c.Val()
 
-			if httpserver.IsLogRollerSubdirective(what) {
-				var err error
-				err = httpserver.ParseRoller(logRoller, what, where)
-				if err != nil {
-					return nil, err
+			// only support roller related options inside a block
+			if !httpserver.IsLogRollerSubdirective(what) {
+				return nil, c.ArgErr()
 			}
+
+			if err := httpserver.ParseRoller(logRoller, what, where); err != nil {
+				return nil, err
 			}
 		}
 

caddyhttp/log/setup_test.go

@@ -205,6 +205,8 @@ func TestLogParse(t *testing.T) {
 				Format: "{when}",
 			}},
 		}}},
+		{`log access.log { rotate_size }`, true, nil},
+		{`log access.log { invalid_option 1 }`, true, nil},
 	}
 	for i, test := range tests {
 		c := caddy.NewTestController("http", test.inputLogRules)