Fix move command logging, config to control IPv6 usage

config.example.json

@@ -2,6 +2,7 @@
   "config-data-dir": "/change/this/to/some/dir",
   "sftp-host": "sftp.example.com",
   "sftp-port": 22,
+  "use-ipv6": false,
   "username": "guest",
   "private-key": "/path/to/private/key",
   "base-path": "./some/dir",

src/dakait/config.clj

@@ -8,6 +8,7 @@
 (def defaults { :server-name "Server"
                 :sftp-port 22
                 :concurrency 4
+                :use-ipv6 false
                 :local-base-path "."
                 :username (System/getProperty "user.name")
                 :push-path "."

src/dakait/downloader.clj

@@ -48,6 +48,7 @@
         os-dest (os-proof dest)
         scp-command (list "scp"
                           "-i" (config :private-key) ;; identity file
+                          (if (config :use-ipv6) "-6" "-4") ;; use appropriate flag to force IP version selection
                           "-B" ;; batch run
                           "-r" ;; recursive if directory
                           "-o" "StrictHostKeyChecking=no"

src/dakait/staging.clj

@@ -52,7 +52,8 @@
   (.mkdirs (io/file dest))
   (with-programs [mv]
     (info "Moving " src " -> " dest)
-    (mv src dest {:verbose true})))
+    (let [r (mv src dest {:verbose true})]
+      (info "Move status: " r))))
 
 (defn stage-file
   "Helps stage the file, triggers download of the file to the staged configuration area, once the