store: Support 'ssh://' URIs in 'GUIX_DAEMON_SOCKET'.

This allows 'guix' commands to talk to a remote store over SSH.

* guix/store.scm (connect-to-daemon)[connect]: Call 'resolve-interface'
for unknown URI schemes.
* guix/store/ssh.scm: New file.
* Makefile.am (MODULES): Add it.
* doc/guix.texi (The Store): Document it.  Mark remote access as
experimental.

1 files changed, 39 insertions, 0 deletions

diff --git a/guix/store/ssh.scm b/guix/store/ssh.scm
new file mode 100644
index 0000000000..09c0832505
--- /dev/null
+++ b/guix/store/ssh.scm
@@ -0,0 +1,39 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2017 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix store ssh)
+  #:use-module (guix ssh)
+  #:use-module (web uri)
+  #:export (connect-to-daemon))
+
+;;; Commentary:
+;;;
+;;; This modules provides the entry point for 'open-connection' in (guix
+;;; store).  Passing an 'ssh://' URI to 'open-connection' triggers the use of
+;;; the code in this module.
+;;;
+;;; End:
+
+(define (connect-to-daemon uri)
+  "Connect to the SSH daemon at URI, a URI object with the 'ssh' scheme."
+  (remote-daemon-channel
+   (open-ssh-session (uri-host uri)
+                     #:port (or (uri-port uri) 22)
+                     #:user (uri-userinfo uri))))
+
+;;; ssh.scm ends here