Backup all your github repositories

backup.go

package main

import (
	"context"
	"flag"
	"fmt"
	"io"
	"log"
	"net/http"
	"os"

	"golang.org/x/oauth2"

	"github.com/google/go-github/github"
)

func main() {
	token := flag.String("token", "", "acces-token to access github")
	flag.Parse()

	var tc *http.Client

	if *token != "" {
		ctx := context.Background()
		ts := oauth2.StaticTokenSource(
			&oauth2.Token{AccessToken: *token},
		)
		tc = oauth2.NewClient(ctx, ts)
	}

	client := github.NewClient(tc)

	repositories, _, err := client.Repositories.List("", &github.RepositoryListOptions{
		Visibility:  "all",
		Affiliation: "owner",
	})

	if err != nil {
		log.Fatalln(err)
	}

	for _, repo := range repositories {
		downloadURL := fmt.Sprintf("%s/archive/master.zip", *repo.HTMLURL)
		resp, err := http.Get(downloadURL)

		if err != nil {
			log.Fatalf("Error when downloading %s => %v", downloadURL, err)
			continue
		}

		f, err := os.Create(fmt.Sprintf("%s.zip", *repo.Name))

		if err != nil {
			panic(err)
		}

		io.Copy(f, resp.Body)
	}
}