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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.chroot.fork)
(named-readtables:in-readtable :consfigurator)
(defun chroot (path)
#+sbcl (sb-posix:chroot path)
#-(or sbcl) (foreign-funcall "chroot" :string path :int))
(defclass chroot.fork-connection (rehome-connection fork-connection)
((into :type :string :initarg :into)))
(defmethod establish-connection ((type (eql :chroot.fork)) remaining &key into)
(unless (and (lisp-connection-p) (zerop (foreign-funcall "geteuid" :int)))
(error "~&Forking into a chroot requires a Lisp image running as root"))
(informat 1 "~&Forking into chroot at ~A" into)
(let* ((datadir-inside
(stripln
(mrun
"chroot" into
"echo" "${XDG_CACHE_HOME:-$HOME/.cache}/consfigurator/data/")))
(datadir (ensure-pathname
(subseq datadir-inside 1)
:defaults into :ensure-absolute t :ensure-directory t)))
(continue-connection
(make-instance 'chroot.fork-connection :into into :datadir datadir)
remaining)))
(defmethod post-fork ((connection chroot.fork-connection))
(unless (zerop (chroot (slot-value connection 'into)))
(error "chroot(2) failed!"))
;; chdir, else our current working directory is a pointer to something
;; outside the chroot
(uiop:chdir "/"))
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