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;;; Consfigurator -- Lisp declarative configuration management system
;;; Copyright (C) 2021 Sean Whitton <spwhitton@spwhitton.name>
;;; This file 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, or (at your option)
;;; any later version.
;;; This file 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 this program. If not, see <http://www.gnu.org/licenses/>.
(in-package :consfigurator.connection.ssh)
(named-readtables:in-readtable :interpol-syntax)
(defmethod establish-connection ((type (eql :ssh)) remaining
&key
(hop (get-hostname))
user)
(declare (ignore remaining))
(run "ssh" "-fN" hop)
(make-instance 'ssh-connection :hostname hop :user user))
(defclass ssh-connection (posix-connection)
((hostname
:initarg :hostname
:documentation "Hostname to SSH to.")
(user
:initarg :user
:documentation "User to log in as."))
(:documentation "Deploy properties using non-interactive SSH."))
(defun ssh-host (connection)
(if-let ((user (slot-value connection :user)))
(format nil "~A@~A" user (slot-value connection :hostname))
(slot-value connection :hostname)))
(defun sshcmd (connection &rest args)
;; wrap in 'sh -c' in case the login shell is not POSIX
(format nil "ssh ~A sh -c ~A"
(ssh-host connection)
(escape-sh-token (if (cdr args) (escape-sh-command args) args))))
(defmethod connection-run ((c ssh-connection) cmd &optional input)
(run :input input (sshcmd c cmd)))
(defmethod connection-readfile ((c ssh-connection) path)
(multiple-value-bind (output error-code)
(run (sshcmd c "test" "-r" path "&&" "cat" path))
(if (= 0 error-code)
output
(error "File ~S not readable" path))))
(defmethod connection-writefile ((c ssh-connection) path contents)
(with-remote-temporary-file (temp)
(run :input contents (sshcmd c "cat" #?">$(temp)"))
(run "mv" temp path)))
;; rsync it straight to to its destination so rsync can do incremental updates
(defmethod connection-upload ((c ssh-connection) from to)
(run "rsync" "-Pavc" from (format nil "~A:~A" (ssh-host c) to)))
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