376 lines
16 KiB
Scheme
376 lines
16 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 gexp)
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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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(define %linux-vm-file-systems
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;; File systems mounted for 'derivation-in-linux-vm'. The store and /xchg
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;; directory are shared with the host over 9p.
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(list (file-system
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(mount-point (%store-prefix))
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(device "store")
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(type "9p")
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(needed-for-boot? #t)
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(options "trans=virtio")
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(check? #f))
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(file-system
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(mount-point "/xchg")
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(device "xchg")
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(type "9p")
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(needed-for-boot? #t)
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(options "trans=virtio")
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(check? #f))))
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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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(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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(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 its 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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MODULES is the set of modules imported in the execution environment 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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(mlet* %store-monad
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((module-dir (imported-modules modules))
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(compiled (compiled-modules modules))
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(user-builder (gexp->file "builder-in-linux-vm" exp))
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(loader (gexp->file "linux-vm-loader"
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#~(begin
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(set! %load-path
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(cons #$module-dir %load-path))
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(set! %load-compiled-path
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(cons #$compiled
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%load-compiled-path))
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(primitive-load #$user-builder))))
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(coreutils -> (car (assoc-ref %final-inputs "coreutils")))
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(initrd (if initrd ; use the default initrd?
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(return initrd)
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(qemu-initrd %linux-vm-file-systems
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#:guile-modules-in-chroot? #t))))
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(define builder
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;; Code that launches the VM that evaluates EXP.
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#~(begin
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(use-modules (guix build utils)
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(guix build vm))
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(let ((inputs '#$(list qemu coreutils))
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(linux (string-append #$linux "/bzImage"))
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(initrd (string-append #$initrd "/initrd"))
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(loader #$loader)
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(graphs '#$(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") inputs)
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(load-in-linux-vm loader
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#:output #$output
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#:linux linux #:initrd initrd
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#:memory-size #$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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(gexp->derivation name builder
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;; TODO: Require the "kvm" feature.
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#:system system
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#:env-vars env-vars
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#:modules `((guix build utils)
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(guix build vm)
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(guix build linux-initrd))
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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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(qemu qemu-headless)
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(disk-image-size (* 100 (expt 2 20)))
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(file-system-type "ext4")
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grub-configuration
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(initialize-store? #f)
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(populate #f)
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(inputs-to-copy '()))
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"Return a bootable, stand-alone QEMU image, with a root partition of type
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FILE-SYSTEM-TYPE. The returned image is a full disk image, with a GRUB
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installation that uses GRUB-CONFIGURATION as its configuration
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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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name
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#~(begin
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(use-modules (guix build vm)
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(guix build utils))
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(let ((inputs
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'#$(append (list qemu parted grub e2fsprogs util-linux)
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(map (compose car (cut assoc-ref %final-inputs <>))
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'("sed" "grep" "coreutils" "findutils" "gawk"))
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(if initialize-store? (list guix) '())))
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;; This variable is unused but allows us to add INPUTS-TO-COPY
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;; as inputs.
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(to-copy
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'#$(map (match-lambda
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((name thing) thing)
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((name thing output) `(,thing ,output)))
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inputs-to-copy)))
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(set-path-environment-variable "PATH" '("bin" "sbin") 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 #$disk-image-size
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#:file-system-type #$file-system-type
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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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#: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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(mlet %store-monad ((services (operating-system-services os)))
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(return (any (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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services))))
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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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(mlet* %store-monad ((os-drv (operating-system-derivation os))
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(build-gid (operating-system-build-gid os))
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(profile (operating-system-profile 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" -> #$os-drv)
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(directory "/run")
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("/run/current-system" -> #$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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(directory "/home" 0 0)))))
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(define* (system-qemu-image os
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#:key
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(file-system-type "ext4")
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(disk-image-size (* 900 (expt 2 20))))
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"Return the derivation of a freestanding QEMU image of DISK-IMAGE-SIZE bytes
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of the GNU system as described by OS."
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(let ((os (operating-system (inherit os)
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;; The mounted file systems are under our control.
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(file-systems (list (file-system
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(mount-point "/")
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(device "/dev/sda1")
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(type file-system-type)))))))
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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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#:file-system-type file-system-type
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#:initialize-store? #t
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#:inputs-to-copy `(("system" ,os-drv))))))
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(define (virtualized-operating-system os)
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"Return an operating system based on OS suitable for use in a virtualized
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environment with the store shared with the host."
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(operating-system (inherit os)
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(initrd (cut qemu-initrd <> #:volatile-root? #t))
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(file-systems (list (file-system
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(mount-point "/")
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(device "/dev/vda1")
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(type "ext4"))
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(file-system
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(mount-point (%store-prefix))
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(device "store")
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(type "9p")
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(needed-for-boot? #t)
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(options "trans=virtio")
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(check? #f))))))
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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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(mlet* %store-monad
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((os -> (virtualized-operating-system os))
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(os-drv (operating-system-derivation os))
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(image (system-qemu-image/shared-store os)))
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(define builder
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#~(call-with-output-file #$output
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(lambda (port)
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(display
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(string-append "#!" #$bash "/bin/sh
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exec " #$qemu "/bin/qemu-system-x86_64 -enable-kvm -no-reboot -net nic,model=virtio \
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-virtfs local,path=" #$(%store-prefix) ",security_model=none,mount_tag=store \
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-net user \
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-kernel " #$(operating-system-kernel os) "/bzImage \
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-initrd " #$os-drv "/initrd \
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-append \"" #$(if graphic? "" "console=ttyS0 ")
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"--load=" #$os-drv "/boot --root=/dev/vda1\" \
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-serial stdio \
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-drive file=" #$image
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",if=virtio,cache=writeback,werror=report,readonly\n")
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port)
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(chmod port #o555))))
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(gexp->derivation "run-vm.sh" builder)))
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;;; vm.scm ends here
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