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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.rehome)
(named-readtables:in-readtable :consfigurator)
(defclass rehome-connection ()
((rehome-datadir
:type :string :initarg :rehome-datadir :reader rehome-datadir
:documentation
"Where Consfigurator would cache items of prerequisite data in the new HOME,
as accessible from the previous connection hop.
In the case of a connection which chroots, for example, this will be the path
to a directory inside the chroot as seen from outside the chroot."))
(:documentation
"A connection which works by switching to a new HOME on the same host."))
(defmethod continue-connection
:before ((connection rehome-connection) remaining)
(upload-all-prerequisite-data connection))
(defmethod connection-upload ((connection rehome-connection) (data file-data))
(with-slots (data-iden1 data-iden2 data-version) data
(let ((inside
(data-pathname
(rehome-datadir connection) data-iden1 data-iden2 data-version))
(outside (remote-data-pathname data-iden1 data-iden2 data-version)))
(mrun "mkdir" "-p" (pathname-directory-pathname inside))
(if (remote-exists-p outside)
(mrun "cp" outside inside)
(let (done)
(unwind-protect
(progn
(connection-upload (connection-parent connection) data)
(mrun "mv" outside inside)
(setq done t))
(unless done (mrun "rm" "-f" outside))))))))
(defmethod connection-clear-data-cache
((connection rehome-connection) iden1 iden2)
(delete-remote-trees
(data-pathname (rehome-datadir connection) iden1 iden2)))
(defmethod get-remote-cached-prerequisite-data
((connection rehome-connection))
(get-local-cached-prerequisite-data (rehome-datadir connection)))
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