Only try to fetch a remote netDB when we actually have one

Makefile

@@ -1,5 +1,5 @@
 
-VERSION=$(shell go build; ./reseed-tools --version | tr -d 'abcdefghijklmnopqrstuvwxyz\- ')
+VERSION=`./reseed-tools-host --version | tr -d 'abcdefghijklmnopqrstuvwxyz\- '`
 APP=reseed-tools
 USER_GH=eyedeekay
 CGO_ENABLED=0
@@ -23,6 +23,9 @@ WHOAMI=$(shell whoami)
 echo:
 	@echo "type make version to do release $(APP) $(VERSION) $(GOOS) $(GOARCH) $(MIN_GO_VERSION) $(I2P_UID) $(I2P_GID)"
 
+host:
+	/usr/bin/go build -o reseed-tools-host
+
 index:
 	edgar
 

cmd/reseed.go

@@ -281,17 +281,19 @@ func reseedAction(c *cli.Context) error {
 		}
 		signerID = string(bytes)
 	}
-	count := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
-	for i := range count {
-		err := downloadRemoteNetDB(c.String("share-peer"), c.String("share-password"), c.String("netdb"), c.String("samaddr"))
-		if err != nil {
-			log.Println("Error downloading remote netDb,", err, "retrying in 10 seconds", i, "attempts remaining")
-			time.Sleep(time.Second * 10)
-		} else {
-			break
+	if c.String("share-peer") != "" {
+		count := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
+		for i := range count {
+			err := downloadRemoteNetDB(c.String("share-peer"), c.String("share-password"), c.String("netdb"), c.String("samaddr"))
+			if err != nil {
+				log.Println("Error downloading remote netDb,", err, "retrying in 10 seconds", i, "attempts remaining")
+				time.Sleep(time.Second * 10)
+			} else {
+				break
+			}
 		}
+		go getSupplementalNetDb(c.String("share-peer"), c.String("share-password"), c.String("netdb"), c.String("samaddr"))
 	}
-	go getSupplementalNetDb(c.String("share-peer"), c.String("share-password"), c.String("netdb"), c.String("samaddr"))
 
 	var tlsCert, tlsKey string
 	tlsHost := c.String("tlsHost")

docs/REMOTE.md

@@ -0,0 +1,34 @@
+Using a remote Network Database
+-------------------------------
+
+Beginning in `reseed-tools 2.5.0` it is possible to use reseed-tools to "share" a netDb directory on one host with a reseed server on another hose.
+This feature is built into the reseed-tools software.
+It is also possible to do this manually using `sshfs`, `ssh` combined with `cron`, and most available backup utilities like `borg` and `syncthing`.
+This guide only covers `reseed-tools`.
+
+Password-Protected Sharing of NetDB content over I2P
+----------------------------------------------------
+
+Run this command on a well-integrated I2P router which is **not** hosting a reseed server on the same IP address.
+To share the whole contents of your netDb directory over I2P, run reseed-tools with the following arguments:
+
+```sh
+reseed-tools share --share-password $(use_a_strong_password) --netdb $(path_to_your_netdb)
+```
+
+In a few seconds, you will have a new I2P site which will provide your netDb as a `.tar.gz` file to anyone with the password.
+Make a note of the base32 address of the new site for the next step.
+
+Password-Protected Retrieval of Shared NetDB content over I2P
+-------------------------------------------------------------
+
+Run this command on a router hosting which **is** hosting a reseed server on the same IP address, or add the arguments to your existing command.
+To retrieve a remote NetDB bundle from a hidden service, run reseed tools with the following arguments:
+
+```sh
+reseed-tools reseed --share-peer $(thebase32addressyoumadeanoteofaboveintheotherstepnow.b32.i2p) --share-password $(use_a_strong_password) --netdb $(path_to_your_netdb)
+```
+
+Periodically, the remote `netdb.tar.gz` bundle will be fetched from the remote server and extracted to the `--netdb` directory.
+If the `--netdb` directory is not empty, local RI's are left intact and never overwritten, essentially combining the local and remote netDb.
+If the directory is empty, the remote netDb will be the only netDb used by the reseed server.

main.go

@@ -19,7 +19,7 @@ func main() {
 
 	app := cli.NewApp()
 	app.Name = "reseed-tools"
-	app.Version = "0.3.0"
+	app.Version = "0.3.1"
 	app.Usage = "I2P tools and reseed server"
 	auth := &cli.Author{
 		Name:  "eyedeekay",