gnu: Add Mosh.

* gnu/packages/ssh.scm (mosh): New variable.

gnu/packages/ssh.scm

@@ -29,6 +29,10 @@ (define-module (gnu packages ssh)
   #:use-module (gnu packages pkg-config)
   #:use-module (gnu packages autotools)
   #:use-module (gnu packages texinfo)
+  #:use-module (gnu packages perl)
+  #:use-module (gnu packages ncurses)
+  #:autoload   (gnu packages protobuf) (protobuf)
+  #:autoload   (gnu packages boost) (boost)
   #:use-module (gnu packages which)
   #:use-module (gnu packages)
   #:use-module (guix packages)
@@ -302,3 +306,45 @@ (define-public corkscrew
 to use it with your HTTP proxy.  Digest based authentication may be supported
 in future and NTLM based authentication is most likey never be supported.")
     (license license:gpl2+)))
+
+(define-public mosh
+  (package
+    (name "mosh")
+    (version "1.2.4")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "http://mosh.mit.edu/mosh-"
+                                  version ".tar.gz"))
+              (sha256
+               (base32
+                "0inzfmqrab3n97m7rrmhd4xh3hjz0xva2sfl5m06w11668r0skg7"))))
+    (build-system gnu-build-system)
+    (arguments
+     '(#:phases (alist-cons-after
+                 'install 'wrap
+                 (lambda* (#:key outputs #:allow-other-keys)
+                   ;; Make sure 'mosh' can find 'mosh-client' and
+                   ;; 'mosh-server'.
+                   (let* ((out (assoc-ref outputs "out"))
+                          (bin (string-append out "/bin")))
+                     (wrap-program (string-append bin "/mosh")
+                                   `("PATH" ":" prefix (,bin)))))
+                 %standard-phases)))
+    (native-inputs
+     `(("pkg-config" ,pkg-config)))
+    (inputs
+     `(("openssl" ,openssl)
+       ("perl" ,perl)
+       ("perl-io-tty" ,perl-io-tty)
+       ("zlib" ,zlib)
+       ("ncurses" ,ncurses)
+       ("protobuf" ,protobuf)
+       ("boost-headers" ,boost)))
+    (home-page "http://mosh.mit.edu/")
+    (synopsis "Remote shell tolerant to intermittent connectivity")
+    (description
+     "Remote terminal application that allows roaming, supports intermittent
+connectivity, and provides intelligent local echo and line editing of user
+keystrokes.  Mosh is a replacement for SSH.  It's more robust and responsive,
+especially over Wi-Fi, cellular, and long-distance links.")
+    (license license:gpl3+)))