hook for bosun conf file saving to push to git

hook.go

package main

import (
	"fmt"
	"log"
	"os"
	"os/exec"
	"path/filepath"
)

const Git = "git"

func main() {
	if len(os.Args) < 4 {
		log.Fatal("error: not enough arguments, expected filename, user, message")
	}
	fileArg := os.Args[1]
	user := os.Args[2]
	message := os.Args[3]
	if fileArg == "" {
		log.Fatal("error: missing config file name")
	}
	if user == "" {
		log.Fatal("error: missing user")
	}
	if message == "" {
		log.Fatal("error: missing message")
	}
	fileDir := filepath.Dir(fileArg)
	gitCommand := func(args ...string) (string, error) {
		args = append([]string{"-C", fileDir}, args...)
		gitCmd := exec.Command(Git, args...)
		output, err := gitCmd.CombinedOutput()
		if err != nil {
			return string(output), err
		}
		return string(output), nil
	}

	// We clean (except maybe other files)
	output, err := gitCommand("status", "-uno", "--porcelain")
	if err != nil {
		log.Fatal(fmt.Sprintf("failed to get git status to see if the working tree is clean"))
	}
	if output == "" {
		log.Println("nothing to do since the working tree is clean")
		os.Exit(0)
	}

	// Commit
	output, err = gitCommand("commit", "-a", "-m", message, "--author", user)
	if err != nil {
		log.Fatal(fmt.Sprintf("could not issue commit: %v %v", err, output))
	}

	// Push
	output, err = gitCommand("push", "origin", "master")
	if err != nil {
		_, err2 := gitCommand("git", "reset", "HEAD", "--hard")
		gitReset := "successful"
		if err2 != nil {
			gitReset = "failed"
		}
		log.Fatal(fmt.Sprintf("could not issue commit (issued a git reset hard which was %v): %v %v", gitReset, err, output))
	}
}