cmd/marina-pull: add -addr flag

Author: sbinet

README.md

@@ -25,3 +25,13 @@ $> marina-pull piscineri3/go-base:latest
 Loaded image: piscineri3/go-base:latest
 2016/09/19 16:22:13 pulling "piscineri3/go-base"... [done] (16.304998995s)
 ```
+
+Note that by default `marina-pull` will try to pull from `piscine.in2p3.fr`.
+You may change this behaviour by passing `-addr=example.com` or `-addr=192.168.0.2` as an argument:
+
+```sh
+$> marina-pull -addr=19.168.0.2 piscineri3/go-base
+2016/09/20 12:41:10 pulling "piscineri3/go-base"...
+Loaded image: piscineri3/go-base:latest
+2016/09/20 12:41:26 pulling "piscineri3/go-base"... [done] (16.304998995s)
+```

cmd/marina-pull/main.go

@@ -5,6 +5,7 @@
 package main
 
 import (
+	"flag"
 	"io"
 	"log"
 	"net/http"
@@ -18,15 +19,18 @@ func main() {
 }
 
 func run() {
-	name := os.Args[1]
+	addr := flag.String("addr", "piscine.in2p3.fr", "address of the marina")
+	flag.Parse()
+
+	name := flag.Arg(0)
 
 	start := time.Now()
 	defer func() {
 		log.Printf("pulling %q... [done] (%v)", name, time.Since(start))
 	}()
 	log.Printf("pulling %q...\n", name)
 
-	resp, err := http.Get("http://piscine.in2p3.fr:8080/docker-images/" + name)
+	resp, err := http.Get("http://" + *addr + ":8080/docker-images/" + name)
 	if err != nil {
 		log.Fatalf("marina-get %q: %v\n", name, err)
 	}