add command: retry;

cmd/retry/README.md

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+在程序返回不为0时重试
+
+Usage: `retry -c 10 -i 2s -- <command> <args>`

cmd/retry/go.mod

@@ -0,0 +1,3 @@
+module main
+
+go 1.20

cmd/retry/main.go

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+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"os/exec"
+	"time"
+)
+
+var (
+	count    int
+	interval time.Duration
+)
+
+func main() {
+	flag.IntVar(&count, "c", 5, "maximum execution times")
+	flag.DurationVar(&interval, "i", time.Second, "retry interval")
+	flag.Parse()
+	if count < 1 {
+		count = 1
+	}
+	if interval < 0 {
+		interval = 0
+	}
+	args := flag.Args()
+	if len(args) == 0 {
+		fmt.Println("Please give the command to execute!")
+		os.Exit(1)
+	}
+	var err error
+	for i := 0; i < count; i++ {
+		if i > 0 {
+			fmt.Printf("retry %d after %s...\n", i, interval)
+			time.Sleep(interval)
+		}
+		cmd := exec.Command(args[0], args[1:]...)
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+		err = cmd.Run()
+		if err == nil {
+			break
+		}
+	}
+	if err != nil {
+		os.Exit(1)
+	}
+}