Do a few validations

ipfs.go

@@ -43,10 +43,10 @@ func (i *IPFS) Get(ref IPFSRef) ([]byte, error) {
 		return nil, err
 	}
 
-	fmt.Printf("Fetching %q from primary location (%q)...", ref, i.GatewayAddressURL.String())
+	fmt.Printf("Fetching %q from %q...", ref, i.GatewayAddressURL.String())
 	resp, err := i.Client.Do(req1)
 	if err != nil {
-		fmt.Printf(" failed (%s), trying fallback (%q)...", err, i.FallbackGatewayAddressURL)
+		fmt.Printf(" failed (%s), trying %q...", err, i.FallbackGatewayAddressURL)
 
 		resp, err = i.Client.Do(req2)
 		if err != nil {

yaml.go

@@ -2,7 +2,9 @@ package bios
 
 import (
 	"encoding/json"
+	"fmt"
 	"io/ioutil"
+	"strings"
 
 	yaml2json "github.com/bronze1man/go-yaml2json"
 )
@@ -28,5 +30,14 @@ func ValidateDiscoveryFile(filename string) error {
 		return err
 	}
 
+	for _, peer := range disco.LaunchData.Peers {
+		if !strings.HasPrefix(string(peer.DiscoveryLink), "/ipns/") {
+			return fmt.Errorf("peer link %q invalid, should start with '/ipns/'", peer.DiscoveryLink)
+		}
+		if peer.Weight > 1.0 {
+			return fmt.Errorf("peer %q weight must be between 0.0 and 1.0", peer.DiscoveryLink)
+		}
+	}
+
 	return nil
 }