127 lines
5.3 KiB
Scheme
127 lines
5.3 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2015 David Thompson <davet@gnu.org>
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;;; Copyright © 2016, 2017, 2019 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu system linux-container)
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#:use-module (ice-9 match)
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#:use-module (srfi srfi-1)
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#:use-module (guix config)
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#:use-module (guix store)
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#:use-module (guix gexp)
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#:use-module (guix derivations)
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#:use-module (guix monads)
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#:use-module (guix modules)
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#:use-module (gnu build linux-container)
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#:use-module (gnu services)
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#:use-module (gnu services base)
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#:use-module (gnu system)
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#:use-module (gnu system file-systems)
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#:export (system-container
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containerized-operating-system
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container-script))
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(define (container-essential-services os)
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"Return a list of essential services corresponding to OS, a
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non-containerized OS. This procedure essentially strips essential services
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from OS that are needed on the bare metal and not in a container."
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(define base
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(remove (lambda (service)
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(memq (service-kind service)
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(list (service-kind %linux-bare-metal-service)
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firmware-service-type
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system-service-type)))
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(operating-system-essential-services os)))
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(cons (service system-service-type
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(let ((locale (operating-system-locale-directory os)))
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(with-monad %store-monad
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(return `(("locale" ,locale))))))
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base))
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(define (containerized-operating-system os mappings)
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"Return an operating system based on OS for use in a Linux container
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environment. MAPPINGS is a list of <file-system-mapping> to realize in the
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containerized OS."
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(define user-file-systems
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(remove (lambda (fs)
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(let ((target (file-system-mount-point fs))
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(source (file-system-device fs)))
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(or (string=? target (%store-prefix))
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(string=? target "/")
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(and (string? source)
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(string-prefix? "/dev/" source))
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(string-prefix? "/dev" target)
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(string-prefix? "/sys" target))))
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(operating-system-file-systems os)))
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(define (mapping->fs fs)
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(file-system (inherit (file-system-mapping->bind-mount fs))
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(needed-for-boot? #t)))
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(define useless-services
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;; Services that make no sense in a container. Those that attempt to
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;; access /dev/tty[0-9] in particular cannot work in a container.
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(list console-font-service-type
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mingetty-service-type
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agetty-service-type))
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(operating-system
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(inherit os)
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(swap-devices '()) ; disable swap
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(essential-services (container-essential-services os))
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(services (remove (lambda (service)
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(memq (service-kind service)
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useless-services))
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(operating-system-user-services os)))
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(file-systems (append (map mapping->fs (cons %store-mapping mappings))
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%container-file-systems
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user-file-systems))))
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(define* (container-script os #:key (mappings '()))
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"Return a derivation of a script that runs OS as a Linux container.
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MAPPINGS is a list of <file-system> objects that specify the files/directories
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that will be shared with the host system."
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(let* ((os (containerized-operating-system os mappings))
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(file-systems (filter file-system-needed-for-boot?
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(operating-system-file-systems os)))
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(specs (map file-system->spec file-systems)))
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(define script
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(with-imported-modules (source-module-closure
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'((guix build utils)
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(gnu build linux-container)))
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#~(begin
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(use-modules (gnu build linux-container)
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(gnu system file-systems) ;spec->file-system
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(guix build utils))
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(call-with-container (map spec->file-system '#$specs)
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(lambda ()
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(setenv "HOME" "/root")
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(setenv "TMPDIR" "/tmp")
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(setenv "GUIX_NEW_SYSTEM" #$os)
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(for-each mkdir-p '("/run" "/bin" "/etc" "/home" "/var"))
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(primitive-load (string-append #$os "/boot")))
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;; A range of 65536 uid/gids is used to cover 16 bits worth of
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;; users and groups, which is sufficient for most cases.
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;;
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;; See: http://www.freedesktop.org/software/systemd/man/systemd-nspawn.html#--private-users=
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#:host-uids 65536))))
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(gexp->script "run-container" script)))
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