Add config for downloading repo migrations

config.go

@@ -29,6 +29,7 @@ type Config struct {
 	Pubsub    PubsubConfig
 	Peering   Peering
 	DNS       DNS
+	Migration Migration
 
 	Provider     Provider
 	Reprovider   Reprovider

init.go

@@ -92,6 +92,10 @@ func InitWithIdentity(identity Identity) (*Config, error) {
 		DNS: DNS{
 			Resolvers: map[string]string{},
 		},
+		Migration: Migration{
+			DownloadSources: []string{},
+			Keep:            "",
+		},
 	}
 
 	return conf, nil

migration.go

@@ -0,0 +1,17 @@
+package config
+
+const DefaultMigrationKeep = "cache"
+
+var DefaultMigrationDownloadSources = []string{"HTTPS", "IPFS"}
+
+// Migration configures how migrations are downloaded and if the downloads are
+// added to IPFS locally
+type Migration struct {
+	// Sources in order of preference, where "IPFS" means use IPFS and "HTTPS"
+	// means use default gateways. Any other values are interpreted as
+	// hostnames for custom gateways. Empty list means "use default sources".
+	DownloadSources []string
+	// Whether or not to keep the migration after downloading it.
+	// Options are "discard", "cache", "pin".  Empty string for default.
+	Keep string
+}

migration_test.go

@@ -0,0 +1,34 @@
+package config
+
+import (
+	"encoding/json"
+	"testing"
+)
+
+func TestMigrationDecode(t *testing.T) {
+	str := `
+		{
+			"DownloadSources": ["IPFS", "HTTP", "127.0.0.1"],
+			"Keep": "cache"
+		}
+	`
+
+	var cfg Migration
+	if err := json.Unmarshal([]byte(str), &cfg); err != nil {
+		t.Errorf("failed while unmarshalling migration struct: %s", err)
+	}
+
+	if len(cfg.DownloadSources) != 3 {
+		t.Fatal("wrong number of DownloadSources")
+	}
+	expect := []string{"IPFS", "HTTP", "127.0.0.1"}
+	for i := range expect {
+		if cfg.DownloadSources[i] != expect[i] {
+			t.Errorf("wrong DownloadSource at %d", i)
+		}
+	}
+
+	if cfg.Keep != "cache" {
+		t.Error("wrong value for Keep")
+	}
+}