gnu: system: Add Linux container module.
* 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.master
David Thompson
David Thompson
parent
5dc876231b
commit
239db054a7
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@ -360,6 +360,7 @@ GNU_SYSTEM_MODULES = \
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gnu/system/grub.scm \
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gnu/system/install.scm \
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gnu/system/linux.scm \
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gnu/system/linux-container.scm \
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gnu/system/linux-initrd.scm \
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gnu/system/locale.scm \
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gnu/system/nss.scm \
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@ -83,6 +83,11 @@
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operating-system-derivation
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operating-system-profile
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operating-system-grub.cfg
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operating-system-etc-directory
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operating-system-locale-directory
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operating-system-boot-script
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file-union
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local-host-aliases
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%setuid-programs
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@ -689,7 +694,7 @@ variable is not set---hence the need for this wrapper."
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(apply execl #$modprobe
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(cons #$modprobe (cdr (command-line))))))))
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(define (operating-system-activation-script os)
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(define* (operating-system-activation-script os #:key container?)
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"Return the activation script for OS---i.e., the code that \"activates\" the
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stateful part of OS, including user accounts and groups, special directories,
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etc."
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@ -763,12 +768,15 @@ etc."
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;; Tell the kernel to use our 'modprobe' command.
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(activate-modprobe #$modprobe)
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;; Tell the kernel where firmware is.
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(activate-firmware
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(string-append #$firmware "/lib/firmware"))
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;; Let users debug their own processes!
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(activate-ptrace-attach)
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;; Tell the kernel where firmware is, unless we are
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;; activating a container.
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#$@(if container?
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#~()
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;; Tell the kernel where firmware is.
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#~((activate-firmware
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(string-append #$firmware "/lib/firmware"))
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;; Let users debug their own processes!
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(activate-ptrace-attach)))
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;; Run the services' activation snippets.
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;; TODO: Use 'load-compiled'.
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@ -777,11 +785,13 @@ etc."
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;; Set up /run/current-system.
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(activate-current-system)))))
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(define (operating-system-boot-script os)
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(define* (operating-system-boot-script os #:key container?)
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"Return the boot script for OS---i.e., the code started by the initrd once
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we're running in the final root."
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we're running in the final root. When CONTAINER? is true, skip all
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hardware-related operations as necessary when booting a Linux container."
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(mlet* %store-monad ((services (operating-system-services os))
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(activate (operating-system-activation-script os))
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(activate (operating-system-activation-script
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os #:container? container?))
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(dmd-conf (dmd-configuration-file services)))
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(gexp->file "boot"
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#~(begin
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@ -0,0 +1,119 @@
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2015 David Thompson <davet@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 (gnu build linux-container)
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#:use-module (gnu system)
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#:use-module (gnu system file-systems)
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#:export (mapping->file-system
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system-container
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containerized-operating-system
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container-script))
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(define (mapping->file-system mapping)
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"Return a file system that realizes MAPPING."
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(match mapping
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(($ <file-system-mapping> source target writable?)
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(file-system
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(mount-point target)
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(device source)
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(type "none")
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(flags (if writable?
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'(bind-mount)
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'(bind-mount read-only)))
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(check? #f)
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(create-mount-point? #t)))))
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(define (system-container os)
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"Return a derivation that builds OS as a Linux container."
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(mlet* %store-monad
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((profile (operating-system-profile os))
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(etc (operating-system-etc-directory os))
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(boot (operating-system-boot-script os #:container? #t))
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(locale (operating-system-locale-directory os)))
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(file-union "system-container"
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`(("boot" ,#~#$boot)
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("profile" ,#~#$profile)
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("locale" ,#~#$locale)
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("etc" ,#~#$etc)))))
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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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(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 (mapping->file-system fs))
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(needed-for-boot? #t)))
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(operating-system (inherit os)
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(swap-devices '()) ; disable swap
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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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(mlet* %store-monad ((os-drv (system-container os)))
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(define script
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#~(begin
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(use-modules (gnu build linux-container)
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(guix build utils))
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(call-with-container '#$specs
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(lambda ()
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(setenv "HOME" "/root")
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(setenv "TMPDIR" "/tmp")
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(setenv "GUIX_NEW_SYSTEM" #$os-drv)
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(for-each mkdir-p '("/run" "/bin" "/etc" "/home" "/var"))
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(primitive-load (string-append #$os-drv "/boot"))))))
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(gexp->script "run-container" script
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#:modules '((ice-9 match)
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(srfi srfi-98)
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(guix config)
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(guix utils)
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(guix build utils)
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(guix build syscalls)
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(gnu build file-systems)
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(gnu build linux-container))))))
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