main.go | 4 ++++

diff --git a/main.go b/main.go
index 921a6ad3bfbc5076a1c91645c8e44e9f1cd764cf890feb07b96e8ba125afb6d4..cbf240f0fa42d7aab6a2b109c3d36efce8646b365e5fe548bb724563bc0bd377 100644
--- a/main.go
+++ b/main.go
@@ -170,6 +170,7 @@ 	if v := os.Getenv(EnvDepFd); v != "" {
 		fdDep = mustParseFd(v, EnvDepFd)
 	}
 	BuildUUID = os.Getenv(EnvBuildUUID)
+	tgts := flag.Args()
 	if BuildUUID == "" {
 		raw := new([16]byte)
 		if _, err = io.ReadFull(rand.Reader, raw[:]); err != nil {
@@ -180,6 +181,9 @@ 		BuildUUID = fmt.Sprintf(
 			"%x-%x-%x-%x-%x",
 			raw[0:4], raw[4:6], raw[6:8], raw[8:10], raw[10:],
 		)
+		if len(tgts) == 0 {
+			tgts = []string{"all"}
+		}
 	}
 	statusInit()