Add offline mode for get

Signed-off-by: jolheiser <john.olheiser@gmail.com>

cmd/get.go

@@ -22,6 +22,10 @@ var Get = cli.Command{
 			Name:  "ignore-local",
 			Usage: "Ignore local packages",
 		},
+		&cli.BoolFlag{
+			Name:  "offline",
+			Usage: "Offline mode, return error instead of querying server",
+		},
 	},
 	Action: doGet,
 }
@@ -44,9 +48,9 @@ func doGet(ctx *cli.Context) error {
 	local := config.PackageMap()
 	for _, pkg := range pkgs {
 		var url string
-		if u, ok := local[pkg]; ok {
+		if u, ok := local[pkg]; ok && !ctx.Bool("ignore-local") {
 			url = u
-		} else {
+		} else if !ctx.Bool("offline") {
 			u, err := queryServer(ctx.String("url"), pkg)
 			if err != nil {
 				beaver.Error(err)
@@ -55,6 +59,11 @@ func doGet(ctx *cli.Context) error {
 			url = u
 		}
 
+		if url == "" {
+			beaver.Errorf("no package found for `%s`", pkg)
+			continue
+		}
+
 		beaver.Infof("getting `%s`...", pkg)
 		if err := goGet(url); err != nil {
 			beaver.Error(err)
@@ -72,7 +81,7 @@ func queryServer(server, name string) (string, error) {
 	endpoint := fmt.Sprintf("%s/%s", server, name)
 	resp, err := http.Get(endpoint)
 	if err != nil {
-		return "", nil
+		return "", fmt.Errorf("could not query server at `%s`", endpoint)
 	}
 
 	if resp.StatusCode != http.StatusOK {