diff --git a/main.go b/main.go
index 9b7400a..430cdac 100755
--- a/main.go
+++ b/main.go
@@ -9,6 +9,7 @@ package main
 import (
 	"flag"
 	"log"
+	"os/exec"
 
 	filedriver "github.com/goftp/file-driver"
 	"github.com/goftp/server"
@@ -16,7 +17,7 @@ import (
 
 func main() {
 	var (
-		root = flag.String("root", "", "Root directory to serve")
+		root = flag.String("root", "./tmp", "Root directory to serve")
 		user = flag.String("user", "admin", "Username for login")
 		pass = flag.String("pass", "123456", "Password for login")
 		port = flag.Int("port", 2121, "Port")
@@ -36,7 +37,15 @@ func main() {
 		Factory:  factory,
 		Port:     *port,
 		Hostname: *host,
-		Auth:     &server.SimpleAuth{Name: *user, Password: *pass},
+		Auth: &callbackAuth{
+			realAuth: &server.SimpleAuth{
+				Name:     *user,
+				Password: *pass,
+			},
+			callback: func() {
+				log.Printf("callback: %v", exec.Command("sh", "-c", "cd /wiki; git add -A :/; git commit -m \"ftp upload\"").Run())
+			},
+		},
 	}
 
 	log.Printf("Starting ftp server on %v:%v", opts.Hostname, opts.Port)
@@ -47,3 +56,19 @@ func main() {
 		log.Fatal("Error starting server:", err)
 	}
 }
+
+type callbackAuth struct {
+	realAuth server.Auth
+	callback func()
+}
+
+func (ca *callbackAuth) CheckPasswd(u, p string) (bool, error) {
+	ok, err := ca.realAuth.CheckPasswd(u, p)
+	if !ok || err != nil {
+		return ok, err
+	}
+	if ca.callback != nil {
+		ca.callback()
+	}
+	return ok, err
+}
diff --git a/test.sh b/test.sh
new file mode 100644
index 0000000..a785ff1
--- /dev/null
+++ b/test.sh
@@ -0,0 +1,6 @@
+echo "
+ user admin 123456
+ ascii
+ put Dockerfile
+ bye
+" | ftp -n 127.0.0.1 2121