use inherit to print output.

src/retry.rs

@@ -0,0 +1,21 @@
+use std::process::{Command, Stdio};
+use std::thread;
+use std::time::Duration;
+
+pub fn retry(cmd: &str, cmd_args: &[String]) {
+    loop {
+        let mut child = Command::new(cmd)
+            .args(cmd_args)
+            .stdout(Stdio::inherit())
+            .stderr(Stdio::inherit())
+            .spawn()
+            .expect("Failed to spawn command.");
+
+        if child.wait().unwrap().success() {
+            break;
+        }
+
+        println!("Error, wait 1s for retry.");
+        thread::sleep(Duration::from_secs(1));
+    }
+}