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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.util.linux-namespace)
(named-readtables:in-readtable :consfigurator)
#+linux
(defun get-userns-owner (fd)
(with-foreign-object (owner 'uid_t)
(if (minusp
(foreign-funcall
"ioctl" :int fd :unsigned-long +NS_GET_OWNER_UID+ :pointer owner
:int))
(error "Couldn't determine owner of target userns.")
(mem-ref owner 'uid_t))))
(defun setgroups-p ()
"In a Lisp-type connection, do we have the ability to use setgroups(2)?"
(and #-linux (zerop (nix:geteuid))
#+linux (capability-p :cap-effective +CAP-SETGID+)
#+linux (string= "allow"
(stripln
(read-file-string "/proc/thread-self/setgroups")))))
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