388 lines
17 KiB
Scheme
388 lines
17 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014 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 vm)
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#:use-module (guix config)
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#:use-module (guix store)
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#:use-module (guix derivations)
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#:use-module (guix packages)
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#:use-module (guix monads)
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#:use-module ((gnu packages base)
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#:select (%final-inputs))
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#:use-module (gnu packages guile)
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#:use-module (gnu packages bash)
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#:use-module (gnu packages less)
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#:use-module (gnu packages qemu)
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#:use-module (gnu packages parted)
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#:use-module (gnu packages zile)
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#:use-module (gnu packages grub)
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#:use-module (gnu packages linux)
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#:use-module (gnu packages package-management)
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#:use-module ((gnu packages make-bootstrap)
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#:select (%guile-static-stripped))
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#:use-module (gnu packages admin)
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#:use-module (gnu system shadow)
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#:use-module (gnu system linux)
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#:use-module (gnu system linux-initrd)
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#:use-module (gnu system grub)
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#:use-module (gnu system)
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#:use-module (gnu services)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:use-module (ice-9 match)
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#:export (expression->derivation-in-linux-vm
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qemu-image
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system-qemu-image
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system-qemu-image/shared-store
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system-qemu-image/shared-store-script))
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;;; Commentary:
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;;;
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;;; Tools to evaluate build expressions within virtual machines.
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;;;
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;;; Code:
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(define* (input->name+output tuple #:key (system (%current-system)))
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"Return as a monadic value a name/file-name pair corresponding to TUPLE, an
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input tuple. The output file name is when building for SYSTEM."
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(with-monad %store-monad
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(match tuple
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((input (? package? package))
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(mlet %store-monad ((out (package-file package #:system system)))
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(return `(,input . ,out))))
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((input (? package? package) sub-drv)
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(mlet %store-monad ((out (package-file package
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#:output sub-drv
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#:system system)))
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(return `(,input . ,out))))
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((input (? derivation? drv))
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(return `(,input . ,(derivation->output-path drv))))
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((input (? derivation? drv) sub-drv)
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(return `(,input . ,(derivation->output-path drv sub-drv))))
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((input (and (? string?) (? store-path?) file))
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(return `(,input . ,file))))))
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;; An alias to circumvent name clashes.
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(define %imported-modules imported-modules)
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(define* (expression->derivation-in-linux-vm name exp
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#:key
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(system (%current-system))
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(inputs '())
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(linux linux-libre)
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initrd
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(qemu qemu-headless)
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(env-vars '())
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(imported-modules
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'((guix build vm)
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(guix build linux-initrd)
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(guix build utils)))
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(guile-for-build
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(%guile-for-build))
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(make-disk-image? #f)
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(references-graphs #f)
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(memory-size 256)
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(disk-image-size
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(* 100 (expt 2 20))))
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"Evaluate EXP in a QEMU virtual machine running LINUX with INITRD (a
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derivation). In the virtual machine, EXP has access to all of INPUTS from the
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store; it should put its output files in the `/xchg' directory, which is
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copied to the derivation's output when the VM terminates. The virtual machine
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runs with MEMORY-SIZE MiB of memory.
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When MAKE-DISK-IMAGE? is true, then create a QEMU disk image of
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DISK-IMAGE-SIZE bytes and return it.
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IMPORTED-MODULES is the set of modules imported in the execution environment
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of EXP.
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When REFERENCES-GRAPHS is true, it must be a list of file name/store path
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pairs, as for `derivation'. The files containing the reference graphs are
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made available under the /xchg CIFS share."
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;; FIXME: Add #:modules parameter, for the 'use-modules' form.
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(define input-alist
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(map input->name+output inputs))
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(define builder
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;; Code that launches the VM that evaluates EXP.
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`(let ()
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(use-modules (guix build utils)
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(guix build vm))
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(let ((linux (string-append (assoc-ref %build-inputs "linux")
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"/bzImage"))
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(initrd (string-append (assoc-ref %build-inputs "initrd")
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"/initrd"))
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(loader (assoc-ref %build-inputs "loader"))
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(graphs ',(match references-graphs
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(((graph-files . _) ...) graph-files)
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(_ #f))))
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(set-path-environment-variable "PATH" '("bin")
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(map cdr %build-inputs))
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(load-in-linux-vm loader
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#:output (assoc-ref %outputs "out")
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#:linux linux #:initrd initrd
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#:memory-size ,memory-size
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#:make-disk-image? ,make-disk-image?
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#:disk-image-size ,disk-image-size
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#:references-graphs graphs))))
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(mlet* %store-monad
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((input-alist (sequence %store-monad input-alist))
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(module-dir (%imported-modules imported-modules))
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(compiled (compiled-modules imported-modules))
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(exp* -> `(let ((%build-inputs ',input-alist))
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,exp))
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(user-builder (text-file "builder-in-linux-vm"
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(object->string exp*)))
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(loader (text-file* "linux-vm-loader" ; XXX: use 'sexp-file'
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"(begin (set! %load-path (cons \""
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module-dir "\" %load-path)) "
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"(set! %load-compiled-path (cons \""
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compiled "\" %load-compiled-path))"
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"(primitive-load \"" user-builder "\"))"))
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(coreutils -> (car (assoc-ref %final-inputs "coreutils")))
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(initrd (if initrd ; use the default initrd?
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(return initrd)
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(qemu-initrd #:guile-modules-in-chroot? #t
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#:mounts `((9p "store" ,(%store-prefix))
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(9p "xchg" "/xchg")))))
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(inputs (lower-inputs `(("qemu" ,qemu)
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("linux" ,linux)
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("initrd" ,initrd)
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("coreutils" ,coreutils)
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("builder" ,user-builder)
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("loader" ,loader)
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,@inputs))))
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(derivation-expression name builder
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;; TODO: Require the "kvm" feature.
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#:system system
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#:inputs inputs
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#:env-vars env-vars
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#:modules (delete-duplicates
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`((guix build utils)
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(guix build vm)
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(guix build linux-initrd)
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,@imported-modules))
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#:guile-for-build guile-for-build
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#:references-graphs references-graphs)))
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(define* (qemu-image #:key
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(name "qemu-image")
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(system (%current-system))
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(disk-image-size (* 100 (expt 2 20)))
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grub-configuration
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(initialize-store? #f)
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(populate #f)
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(inputs '())
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(inputs-to-copy '()))
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"Return a bootable, stand-alone QEMU image. The returned image is a full
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disk image, with a GRUB installation that uses GRUB-CONFIGURATION as its
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configuration file (GRUB-CONFIGURATION must be the name of a file in the VM.)
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INPUTS-TO-COPY is a list of inputs (as for packages) whose closure is copied
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into the image being built. When INITIALIZE-STORE? is true, initialize the
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store database in the image so that Guix can be used in the image.
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POPULATE is a list of directives stating directories or symlinks to be created
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in the disk image partition. It is evaluated once the image has been
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populated with INPUTS-TO-COPY. It can be used to provide additional files,
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such as /etc files."
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(mlet %store-monad
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((graph (sequence %store-monad
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(map input->name+output inputs-to-copy))))
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(expression->derivation-in-linux-vm
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"qemu-image"
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`(let ()
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(use-modules (guix build vm)
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(guix build utils))
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(set-path-environment-variable "PATH" '("bin" "sbin")
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(map cdr %build-inputs))
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(let ((graphs ',(match inputs-to-copy
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(((names . _) ...)
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names))))
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(initialize-hard-disk #:grub.cfg ,grub-configuration
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#:closures-to-copy graphs
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#:disk-image-size ,disk-image-size
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#:initialize-store? ,initialize-store?
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#:directives ',populate)
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(reboot)))
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#:system system
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#:inputs `(("parted" ,parted)
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("grub" ,grub)
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("e2fsprogs" ,e2fsprogs)
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;; For shell scripts.
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("sed" ,(car (assoc-ref %final-inputs "sed")))
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("grep" ,(car (assoc-ref %final-inputs "grep")))
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("coreutils" ,(car (assoc-ref %final-inputs "coreutils")))
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("findutils" ,(car (assoc-ref %final-inputs "findutils")))
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("gawk" ,(car (assoc-ref %final-inputs "gawk")))
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("util-linux" ,util-linux)
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,@(if initialize-store?
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`(("guix" ,guix))
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'())
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,@inputs-to-copy)
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#:make-disk-image? #t
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#:disk-image-size disk-image-size
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#:references-graphs graph)))
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;;;
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;;; Stand-alone VM image.
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;;;
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(define (operating-system-build-gid os)
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"Return as a monadic value the group id for build users of OS, or #f."
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(anym %store-monad
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(lambda (service)
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(and (equal? '(guix-daemon)
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(service-provision service))
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(match (service-user-groups service)
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((group)
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(user-group-id group)))))
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(operating-system-services os)))
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(define (operating-system-default-contents os)
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"Return a list of directives suitable for 'system-qemu-image' describing the
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basic contents of the root file system of OS."
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(define (user-directories user)
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(let ((home (user-account-home-directory user))
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;; XXX: Deal with automatically allocated ids.
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(uid (or (user-account-uid user) 0))
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(gid (or (user-account-gid user) 0))
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(root (string-append "/var/guix/profiles/per-user/"
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(user-account-name user))))
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`((directory ,root ,uid ,gid)
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(directory ,home ,uid ,gid))))
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(mlet* %store-monad ((os-drv (operating-system-derivation os))
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(os-dir -> (derivation->output-path os-drv))
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(build-gid (operating-system-build-gid os))
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(profile (operating-system-profile-directory os)))
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(return `((directory ,(%store-prefix) 0 ,(or build-gid 0))
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(directory "/etc")
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(directory "/var/log") ; for dmd
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(directory "/var/run/nscd")
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(directory "/var/guix/gcroots")
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("/var/guix/gcroots/system" -> ,os-dir)
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(directory "/run")
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("/run/current-system" -> ,profile)
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(directory "/bin")
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("/bin/sh" -> "/run/current-system/bin/bash")
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(directory "/tmp")
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(directory "/var/guix/profiles/per-user/root" 0 0)
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(directory "/root" 0 0) ; an exception
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,@(append-map user-directories
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(operating-system-users os))))))
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(define* (system-qemu-image os
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#:key (disk-image-size (* 900 (expt 2 20))))
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"Return the derivation of a QEMU image of DISK-IMAGE-SIZE bytes of the GNU
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system as described by OS."
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(mlet* %store-monad
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((os-drv (operating-system-derivation os))
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(os-dir -> (derivation->output-path os-drv))
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(grub.cfg -> (string-append os-dir "/grub.cfg"))
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(populate (operating-system-default-contents os)))
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(qemu-image #:grub-configuration grub.cfg
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#:populate populate
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#:disk-image-size disk-image-size
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#:initialize-store? #t
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#:inputs-to-copy `(("system" ,os-drv)))))
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(define* (system-qemu-image/shared-store
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os
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#:key (disk-image-size (* 15 (expt 2 20))))
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"Return a derivation that builds a QEMU image of OS that shares its store
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with the host."
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(mlet* %store-monad
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((os-drv (operating-system-derivation os))
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(os-dir -> (derivation->output-path os-drv))
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(grub.cfg -> (string-append os-dir "/grub.cfg"))
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(populate (operating-system-default-contents os)))
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;; TODO: Initialize the database so Guix can be used in the guest.
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(qemu-image #:grub-configuration grub.cfg
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#:populate populate
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#:disk-image-size disk-image-size)))
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(define* (system-qemu-image/shared-store-script
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os
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#:key
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(qemu qemu)
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(graphic? #t))
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"Return a derivation that builds a script to run a virtual machine image of
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OS that shares its store with the host."
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(let* ((initrd (qemu-initrd #:mounts `((9p "store" ,(%store-prefix)))
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#:volatile-root? #t))
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(os (operating-system (inherit os) (initrd initrd))))
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(define builder
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(mlet %store-monad ((image (system-qemu-image/shared-store os))
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(qemu (package-file qemu
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"bin/qemu-system-x86_64"))
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(bash (package-file bash "bin/sh"))
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(kernel (package-file (operating-system-kernel os)
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"bzImage"))
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(initrd initrd)
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(os-drv (operating-system-derivation os)))
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(return `(let ((out (assoc-ref %outputs "out")))
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(call-with-output-file out
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(lambda (port)
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(display
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(string-append "#!" ,bash "
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exec " ,qemu " -enable-kvm -no-reboot -net nic,model=virtio \
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-virtfs local,path=" ,(%store-prefix) ",security_model=none,mount_tag=store \
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-net user \
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-kernel " ,kernel " -initrd "
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,(string-append (derivation->output-path initrd) "/initrd") " \
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-append \"" ,(if graphic? "" "console=ttyS0 ")
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"--load=" ,(derivation->output-path os-drv) "/boot --root=/dev/vda1\" \
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-drive file=" ,(derivation->output-path image)
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",if=virtio,cache=writeback,werror=report,readonly\n")
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port)))
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(chmod out #o555)
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#t))))
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(mlet %store-monad ((image (system-qemu-image/shared-store os))
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(initrd initrd)
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(qemu (package->derivation qemu))
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(bash (package->derivation bash))
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(os (operating-system-derivation os))
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(builder builder))
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(derivation-expression "run-vm.sh" builder
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#:inputs `(("qemu" ,qemu)
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("image" ,image)
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("bash" ,bash)
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("initrd" ,initrd)
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("os" ,os))))))
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;;; vm.scm ends here
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