Simple Webhook (exec shell script)

webhook.go

package main

import (
	"net/http"
	"log"
	"flag"
	"os"
	"os/exec"
	"sync"
	"fmt"
)

var SHELL = ""
var PORT = 10086
var mu sync.Mutex

func init() {
	flag.StringVar(&SHELL, "shell", SHELL, "exec shell script when call deploy")
	flag.IntVar(&PORT, "port", PORT, "Listen port")
	flag.Parse()
}

func main() {

	if len(SHELL) == 0 {
		log.Fatal("Unknown shell script")
	}

	if _, err := os.Stat(SHELL); os.IsNotExist(err) {
		log.Fatalf("Shell script not found, %s", SHELL)
	}

	http.HandleFunc("/webhook", func(w http.ResponseWriter, r *http.Request) {
		mu.Lock()
		out, err := exec.Command(SHELL).Output()
		if err != nil {
			w.WriteHeader(http.StatusInternalServerError)
			w.Write([]byte(err.Error()))
		} else {
			w.Write(out)
		}
		mu.Unlock()
	})

	log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", PORT), nil))
}