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gnu: system: Add Linux container module.

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* gnu/system/linux-container.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu/system.scm: Export 'operating-system-etc-directory',
  'operating-system-boot-script', 'operating-system-locale-directory', and
  'file-union'.
  (operating-system-boot-script): Add #:container? keyword argument.
  (operating-system-activation-script): Add #:container?  keyword argument.
  Don't call 'activate-firmware' or 'activate-ptrace-attach' when activating a
  container.
This commit is contained in:
David Thompson 2015-06-08 08:59:00 -04:00 committed by David Thompson
parent 5dc876231b
commit 239db054a7
3 changed files with 140 additions and 10 deletions
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1
gnu-system.am
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@ -360,6 +360,7 @@ GNU_SYSTEM_MODULES = \
gnu/system/grub.scm \
gnu/system/install.scm \
gnu/system/linux.scm \
gnu/system/linux-container.scm \
gnu/system/linux-initrd.scm \
gnu/system/locale.scm \
gnu/system/nss.scm \

30
gnu/system.scm
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@ -83,6 +83,11 @@ (define-module (gnu system)
operating-system-derivation
operating-system-profile
operating-system-grub.cfg
operating-system-etc-directory
operating-system-locale-directory
operating-system-boot-script
file-union
local-host-aliases
%setuid-programs
@ -689,7 +694,7 @@ (define (modprobe-wrapper)
(apply execl #$modprobe
(cons #$modprobe (cdr (command-line))))))))
(define (operating-system-activation-script os)
(define* (operating-system-activation-script os #:key container?)
"Return the activation script for OS---i.e., the code that \"activates\" the
stateful part of OS, including user accounts and groups, special directories,
etc."
@ -763,12 +768,15 @@ (define group-specs
;; Tell the kernel to use our 'modprobe' command.
(activate-modprobe #$modprobe)
;; Tell the kernel where firmware is.
(activate-firmware
(string-append #$firmware "/lib/firmware"))
;; Let users debug their own processes!
(activate-ptrace-attach)
;; Tell the kernel where firmware is, unless we are
;; activating a container.
#$@(if container?
#~()
;; Tell the kernel where firmware is.
#~((activate-firmware
(string-append #$firmware "/lib/firmware"))
;; Let users debug their own processes!
(activate-ptrace-attach)))
;; Run the services' activation snippets.
;; TODO: Use 'load-compiled'.
@ -777,11 +785,13 @@ (define group-specs
;; Set up /run/current-system.
(activate-current-system)))))
(define (operating-system-boot-script os)
(define* (operating-system-boot-script os #:key container?)
"Return the boot script for OS---i.e., the code started by the initrd once
we're running in the final root."
we're running in the final root. When CONTAINER? is true, skip all
hardware-related operations as necessary when booting a Linux container."
(mlet* %store-monad ((services (operating-system-services os))
(activate (operating-system-activation-script os))
(activate (operating-system-activation-script
os #:container? container?))
(dmd-conf (dmd-configuration-file services)))
(gexp->file "boot"
#~(begin

119
gnu/system/linux-container.scm Normal file
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@ -0,0 +1,119 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix 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 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (gnu system linux-container)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (guix config)
#:use-module (guix store)
#:use-module (guix gexp)
#:use-module (guix derivations)
#:use-module (guix monads)
#:use-module (gnu build linux-container)
#:use-module (gnu system)
#:use-module (gnu system file-systems)
#:export (mapping->file-system
system-container
containerized-operating-system
container-script))
(define (mapping->file-system mapping)
"Return a file system that realizes MAPPING."
(match mapping
(($ <file-system-mapping> source target writable?)
(file-system
(mount-point target)
(device source)
(type "none")
(flags (if writable?
'(bind-mount)
'(bind-mount read-only)))
(check? #f)
(create-mount-point? #t)))))
(define (system-container os)
"Return a derivation that builds OS as a Linux container."
(mlet* %store-monad
((profile (operating-system-profile os))
(etc (operating-system-etc-directory os))
(boot (operating-system-boot-script os #:container? #t))
(locale (operating-system-locale-directory os)))
(file-union "system-container"
`(("boot" ,#~#$boot)
("profile" ,#~#$profile)
("locale" ,#~#$locale)
("etc" ,#~#$etc)))))
(define (containerized-operating-system os mappings)
"Return an operating system based on OS for use in a Linux container
environment. MAPPINGS is a list of <file-system-mapping> to realize in the
containerized OS."
(define user-file-systems
(remove (lambda (fs)
(let ((target (file-system-mount-point fs))
(source (file-system-device fs)))
(or (string=? target (%store-prefix))
(string=? target "/")
(string-prefix? "/dev/" source)
(string-prefix? "/dev" target)
(string-prefix? "/sys" target))))
(operating-system-file-systems os)))
(define (mapping->fs fs)
(file-system (inherit (mapping->file-system fs))
(needed-for-boot? #t)))
(operating-system (inherit os)
(swap-devices '()) ; disable swap
(file-systems (append (map mapping->fs (cons %store-mapping mappings))
%container-file-systems
user-file-systems))))
(define* (container-script os #:key (mappings '()))
"Return a derivation of a script that runs OS as a Linux container.
MAPPINGS is a list of <file-system> objects that specify the files/directories
that will be shared with the host system."
(let* ((os (containerized-operating-system os mappings))
(file-systems (filter file-system-needed-for-boot?
(operating-system-file-systems os)))
(specs (map file-system->spec file-systems)))
(mlet* %store-monad ((os-drv (system-container os)))
(define script
#~(begin
(use-modules (gnu build linux-container)
(guix build utils))
(call-with-container '#$specs
(lambda ()
(setenv "HOME" "/root")
(setenv "TMPDIR" "/tmp")
(setenv "GUIX_NEW_SYSTEM" #$os-drv)
(for-each mkdir-p '("/run" "/bin" "/etc" "/home" "/var"))
(primitive-load (string-append #$os-drv "/boot"))))))
(gexp->script "run-container" script
#:modules '((ice-9 match)
(srfi srfi-98)
(guix config)
(guix utils)
(guix build utils)
(guix build syscalls)
(gnu build file-systems)
(gnu build linux-container))))))