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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.property.swap)
(named-readtables:in-readtable :consfigurator)
(defprop %swapfile-exists :posix (size location)
(:check
(declare (ignore size))
(remote-exists-p location))
(:apply
(mrun #?"umask 077; fallocate -l ${size} ${(unix-namestring location)}")
(mrun "mkswap" location))
(:unapply
(declare (ignore size))
(mrun :may-fail "swapoff" location)
(delete-remote-trees location)))
(defproplist has-swap-file :posix (size &key (location #P"/var/lib/swapfile"))
"Add a swap file. SIZE is the -l argument to fallocate(1).
Current implementation assumes a non-CoW filesystem; see NOTES in swapon(8)."
(:desc #?"Has swapfile of size ${size}")
(:hostattrs (os:required 'os:linux))
(on-apply-change (%swapfile-exists size location)
(cmd:single "swapon" location))
(fstab:has-entries
(strcat (unix-namestring location) " swap swap defaults 0 0")))
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