701 lines
30 KiB
Scheme
701 lines
30 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2016 Christopher Allan Webber <cwebber@dustycloud.org>
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;;; Copyright © 2016 Leo Famulari <leo@famulari.name>
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;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
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;;; Copyright © 2017 Marius Bakke <mbakke@fastmail.com>
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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 (guix records)
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#:use-module (guix modules)
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#:use-module ((gnu build vm)
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#:select (qemu-command))
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#:use-module (gnu packages base)
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#:use-module (gnu packages bootloaders)
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#:use-module (gnu packages cdrom)
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#:use-module (gnu packages guile)
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#:use-module (gnu packages gawk)
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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 virtualization)
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#:use-module (gnu packages disk)
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#:use-module (gnu packages zile)
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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 bootloader)
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#:use-module ((gnu bootloader grub) #:select (grub-mkrescue-bootloader))
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#:use-module (gnu system shadow)
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#:use-module (gnu system pam)
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#:use-module (gnu system linux-initrd)
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#:use-module (gnu bootloader)
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#:use-module (gnu system file-systems)
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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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virtualized-operating-system
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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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system-disk-image
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virtual-machine
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virtual-machine?))
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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 %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-minimal)
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(env-vars '())
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(guile-for-build
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(%guile-for-build))
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(single-file-output? #f)
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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-format "qcow2")
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(disk-image-size 'guess))
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"Evaluate EXP in a QEMU virtual machine running LINUX with INITRD (a
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derivation). The virtual machine runs with MEMORY-SIZE MiB of memory. In the
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virtual machine, EXP has access to all its inputs from the store; it should
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put its output file(s) in the '/xchg' directory.
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If SINGLE-FILE-OUTPUT? is true, copy a single file from '/xchg' to OUTPUT.
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Otherwise, copy the contents of /xchg to a new directory OUTPUT.
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When MAKE-DISK-IMAGE? is true, then create a QEMU disk image of type
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DISK-IMAGE-FORMAT (e.g., 'qcow2' or 'raw'), of DISK-IMAGE-SIZE bytes and
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return it. When DISK-IMAGE-SIZE is 'guess, estimate the image size based
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based on the size of the closure of REFERENCES-GRAPHS.
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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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((user-builder (gexp->file "builder-in-linux-vm" exp))
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(loader (gexp->file "linux-vm-loader"
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#~(primitive-load #$user-builder)))
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(coreutils -> (canonical-package coreutils))
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(initrd (if initrd ; use the default initrd?
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(return initrd)
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(base-initrd %linux-vm-file-systems
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#:linux linux
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#:virtio? #t
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#:qemu-networking? #t))))
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(define builder
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;; Code that launches the VM that evaluates EXP.
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(with-imported-modules (source-module-closure '((guix build utils)
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(gnu build vm)))
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#~(begin
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(use-modules (guix build utils)
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(gnu build vm))
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(let* ((inputs '#$(list qemu coreutils))
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(linux (string-append #$linux "/"
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#$(system-linux-image-file-name)))
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(initrd (string-append #$initrd "/initrd"))
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(loader #$loader)
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(graphs '#$(match references-graphs
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(((graph-files . _) ...) graph-files)
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(_ #f)))
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(size #$(if (eq? 'guess disk-image-size)
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#~(+ (* 70 (expt 2 20)) ;ESP
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(estimated-partition-size graphs))
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disk-image-size)))
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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? #$make-disk-image?
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#:single-file-output? #$single-file-output?
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#:disk-image-format #$disk-image-format
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#:disk-image-size 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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#:guile-for-build guile-for-build
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#:references-graphs references-graphs)))
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(define* (iso9660-image #:key
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(name "iso9660-image")
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file-system-label
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file-system-uuid
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(system (%current-system))
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(qemu qemu-minimal)
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os-drv
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bootcfg-drv
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bootloader
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(inputs '()))
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"Return a bootable, stand-alone iso9660 image.
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INPUTS is a list of inputs (as for packages)."
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(expression->derivation-in-linux-vm
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name
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(with-imported-modules (source-module-closure '((gnu build vm)
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(guix build utils)))
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#~(begin
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(use-modules (gnu build vm)
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(guix build utils))
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(let ((inputs
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'#$(append (list qemu parted e2fsprogs dosfstools xorriso)
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(map canonical-package
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(list sed grep coreutils findutils gawk))))
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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-register
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'#$(map (match-lambda
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((name thing) thing)
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((name thing output) `(,thing ,output)))
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inputs)))
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(set-path-environment-variable "PATH" '("bin" "sbin") inputs)
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(make-iso9660-image #$(bootloader-package bootloader)
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#$bootcfg-drv
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#$os-drv
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"/xchg/guixsd.iso"
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#:volume-id #$file-system-label
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#:volume-uuid #$file-system-uuid)
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(reboot))))
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#:system system
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#:make-disk-image? #f
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#:single-file-output? #t
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#:references-graphs inputs))
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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-minimal)
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(disk-image-size 'guess)
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(disk-image-format "qcow2")
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(file-system-type "ext4")
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file-system-label
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os-drv
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bootcfg-drv
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bootloader
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(register-closures? #t)
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(inputs '())
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copy-inputs?)
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"Return a bootable, stand-alone QEMU image of type DISK-IMAGE-FORMAT (e.g.,
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'qcow2' or 'raw'), with a root partition of type FILE-SYSTEM-TYPE.
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Optionally, FILE-SYSTEM-LABEL can be specified as the volume name for the root
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partition. The returned image is a full disk image that runs OS-DERIVATION,
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with a GRUB 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 is a list of inputs (as for packages). When COPY-INPUTS? is true, copy
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all of INPUTS into the image being built. When REGISTER-CLOSURES? is true,
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register INPUTS in the store database of the image so that Guix can be used in
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the image."
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(expression->derivation-in-linux-vm
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name
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(with-imported-modules (source-module-closure '((gnu build vm)
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(guix build utils)))
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#~(begin
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(use-modules (gnu build vm)
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(guix build utils)
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(srfi srfi-26))
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(let ((inputs
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'#$(append (list qemu parted e2fsprogs dosfstools)
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(map canonical-package
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(list sed grep coreutils findutils gawk))
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(if register-closures? (list guix) '())))
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;; This variable is unused but allows us to add INPUTS-TO-COPY
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;; as inputs.
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(to-register
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'#$(map (match-lambda
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((name thing) thing)
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((name thing output) `(,thing ,output)))
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inputs)))
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(set-path-environment-variable "PATH" '("bin" "sbin") inputs)
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(let* ((graphs '#$(match inputs
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(((names . _) ...)
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names)))
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(initialize (root-partition-initializer
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#:closures graphs
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#:copy-closures? #$copy-inputs?
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#:register-closures? #$register-closures?
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#:system-directory #$os-drv))
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(root-size #$(if (eq? 'guess disk-image-size)
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#~(estimated-partition-size
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(map (cut string-append "/xchg/" <>)
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graphs))
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(- disk-image-size
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(* 50 (expt 2 20)))))
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(partitions (list (partition
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(size root-size)
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(label #$file-system-label)
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(file-system #$file-system-type)
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(flags '(boot))
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(initializer initialize))
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;; Append a small EFI System Partition for
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;; use with UEFI bootloaders.
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(partition
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;; The standalone grub image is about 10MiB, but
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;; leave some room for custom or multiple images.
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(size (* 40 (expt 2 20)))
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(label "GNU-ESP") ;cosmetic only
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;; Use "vfat" here since this property is used
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;; when mounting. The actual FAT-ness is based
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;; on filesystem size (16 in this case).
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(file-system "vfat")
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(flags '(esp))))))
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(initialize-hard-disk "/dev/vda"
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#:partitions partitions
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#:grub-efi #$grub-efi
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#:bootloader-package
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#$(bootloader-package bootloader)
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#:bootcfg #$bootcfg-drv
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#:bootcfg-location
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#$(bootloader-configuration-file bootloader)
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#:bootloader-installer
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#$(bootloader-installer bootloader))
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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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#:disk-image-format disk-image-format
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#:references-graphs inputs))
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;;;
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;;; VM and disk images.
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;;;
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(define* (system-disk-image os
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#:key
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(name "disk-image")
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(file-system-type "ext4")
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(disk-image-size (* 900 (expt 2 20)))
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(volatile? #t))
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"Return the derivation of a disk image of DISK-IMAGE-SIZE bytes of the
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system described by OS. Said image can be copied on a USB stick as is. When
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VOLATILE? is true, the root file system is made volatile; this is useful
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to USB sticks meant to be read-only."
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(define normalize-label
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;; ISO labels are all-caps (case-insensitive), but since
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;; 'find-partition-by-label' is case-sensitive, make it all-caps here.
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(if (string=? "iso9660" file-system-type)
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string-upcase
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identity))
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(define root-label
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;; Volume name of the root file system. Since we don't know which device
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;; will hold it, we use the volume name to find it (using the UUID would
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;; be even better, but somewhat less convenient.)
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(normalize-label "GuixSD_image"))
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(define file-systems-to-keep
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(remove (lambda (fs)
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(string=? (file-system-mount-point fs) "/"))
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(operating-system-file-systems os)))
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(let ((os (operating-system (inherit os)
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;; Since this is meant to be used on real hardware, don't
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;; install QEMU networking or anything like that. Assume USB
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;; mass storage devices (usb-storage.ko) are available.
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(initrd (lambda (file-systems . rest)
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(apply base-initrd file-systems
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#:volatile-root? #t
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rest)))
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(bootloader (if (string=? "iso9660" file-system-type)
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(bootloader-configuration
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(inherit (operating-system-bootloader os))
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(bootloader grub-mkrescue-bootloader))
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(operating-system-bootloader os)))
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;; Force our own root file system.
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(file-systems (cons (file-system
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(mount-point "/")
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(device root-label)
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(title 'label)
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(type file-system-type))
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file-systems-to-keep)))))
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(mlet* %store-monad ((os-drv (operating-system-derivation os))
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(bootcfg (operating-system-bootcfg os)))
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(if (string=? "iso9660" file-system-type)
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(iso9660-image #:name name
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#:file-system-label root-label
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#:file-system-uuid #f
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#:os-drv os-drv
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#:bootcfg-drv bootcfg
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#:bootloader (bootloader-configuration-bootloader
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(operating-system-bootloader os))
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#:inputs `(("system" ,os-drv)
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("bootcfg" ,bootcfg)))
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(qemu-image #:name name
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#:os-drv os-drv
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#:bootcfg-drv bootcfg
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#:bootloader (bootloader-configuration-bootloader
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(operating-system-bootloader os))
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#:disk-image-size disk-image-size
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#:disk-image-format "raw"
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#:file-system-type (if (string=? "iso9660"
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file-system-type)
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"ext4"
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file-system-type)
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#:file-system-label root-label
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#:copy-inputs? #t
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#:register-closures? #t
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#:inputs `(("system" ,os-drv)
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("bootcfg" ,bootcfg)))))))
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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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(define file-systems-to-keep
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;; Keep only file systems other than root and not normally bound to real
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;; devices.
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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 "/")
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(string-prefix? "/dev/" source))))
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(operating-system-file-systems os)))
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(let ((os (operating-system (inherit os)
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;; Use an initrd with the whole QEMU shebang.
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(initrd (lambda (file-systems . rest)
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(apply base-initrd file-systems
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#:virtio? #t
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rest)))
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;; Force our own root file system.
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(file-systems (cons (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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file-systems-to-keep)))))
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(mlet* %store-monad
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((os-drv (operating-system-derivation os))
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(bootcfg (operating-system-bootcfg os)))
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(qemu-image #:os-drv os-drv
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#:bootcfg-drv bootcfg
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#:bootloader (bootloader-configuration-bootloader
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(operating-system-bootloader os))
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#:disk-image-size disk-image-size
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#:file-system-type file-system-type
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#:inputs `(("system" ,os-drv)
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("bootcfg" ,bootcfg))
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#:copy-inputs? #t))))
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;;;
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;;; VMs that share file systems with the host.
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;;;
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(define (file-system->mount-tag fs)
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"Return a 9p mount tag for host file system FS."
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;; QEMU mount tags cannot contain slashes and cannot start with '_'.
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;; Compute an identifier that corresponds to the rules.
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(string-append "TAG"
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(string-map (match-lambda
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(#\/ #\_)
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(chr chr))
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fs)))
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(define (mapping->file-system mapping)
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"Return a 9p 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 (file-system->mount-tag source))
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(type "9p")
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(flags (if writable? '() '(read-only)))
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(options (string-append "trans=virtio"))
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(check? #f)
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(create-mount-point? #t)))))
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(define* (virtualized-operating-system os mappings #:optional (full-boot? #f))
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"Return an operating system based on OS suitable for use in a virtualized
|
||
environment with the store shared with the host. MAPPINGS is a list of
|
||
<file-system-mapping> to realize in the virtualized OS."
|
||
(define user-file-systems
|
||
;; Remove file systems that conflict with those added below, or that are
|
||
;; normally bound to real devices.
|
||
(remove (lambda (fs)
|
||
(let ((target (file-system-mount-point fs))
|
||
(source (file-system-device fs)))
|
||
(or (string=? target (%store-prefix))
|
||
(string=? target "/")
|
||
(and (eq? 'device (file-system-title fs))
|
||
(string-prefix? "/dev/" source)))))
|
||
(operating-system-file-systems os)))
|
||
|
||
(define virtual-file-systems
|
||
(cons (file-system
|
||
(mount-point "/")
|
||
(device "/dev/vda1")
|
||
(type "ext4"))
|
||
|
||
(append (map mapping->file-system mappings)
|
||
user-file-systems)))
|
||
|
||
(operating-system (inherit os)
|
||
(initrd (lambda (file-systems . rest)
|
||
(apply base-initrd file-systems
|
||
#:volatile-root? #t
|
||
#:virtio? #t
|
||
rest)))
|
||
|
||
;; Disable swap.
|
||
(swap-devices '())
|
||
|
||
;; XXX: When FULL-BOOT? is true, do not add a 9p mount for /gnu/store
|
||
;; since that would lead the bootloader config to look for the kernel and
|
||
;; initrd in it.
|
||
(file-systems (if full-boot?
|
||
virtual-file-systems
|
||
(cons
|
||
(file-system
|
||
(inherit (mapping->file-system %store-mapping))
|
||
(needed-for-boot? #t))
|
||
virtual-file-systems)))))
|
||
|
||
(define* (system-qemu-image/shared-store
|
||
os
|
||
#:key
|
||
full-boot?
|
||
(disk-image-size (* (if full-boot? 500 30) (expt 2 20))))
|
||
"Return a derivation that builds a QEMU image of OS that shares its store
|
||
with the host.
|
||
|
||
When FULL-BOOT? is true, return an image that does a complete boot sequence,
|
||
bootloaded included; thus, make a disk image that contains everything the
|
||
bootloader refers to: OS kernel, initrd, bootloader data, etc."
|
||
(mlet* %store-monad ((os-drv (operating-system-derivation os))
|
||
(bootcfg (operating-system-bootcfg os)))
|
||
;; XXX: When FULL-BOOT? is true, we end up creating an image that contains
|
||
;; BOOTCFG and all its dependencies, including the output of OS-DRV.
|
||
;; This is more than needed (we only need the kernel, initrd, GRUB for its
|
||
;; font, and the background image), but it's hard to filter that.
|
||
(qemu-image #:os-drv os-drv
|
||
#:bootcfg-drv bootcfg
|
||
#:bootloader (bootloader-configuration-bootloader
|
||
(operating-system-bootloader os))
|
||
#:disk-image-size disk-image-size
|
||
#:inputs (if full-boot?
|
||
`(("bootcfg" ,bootcfg))
|
||
'())
|
||
|
||
;; XXX: Passing #t here is too slow, so let it off by default.
|
||
#:register-closures? #f
|
||
#:copy-inputs? full-boot?)))
|
||
|
||
(define* (common-qemu-options image shared-fs)
|
||
"Return the a string-value gexp with the common QEMU options to boot IMAGE,
|
||
with '-virtfs' options for the host file systems listed in SHARED-FS."
|
||
|
||
(define (virtfs-option fs)
|
||
#~(format #f "-virtfs local,path=~s,security_model=none,mount_tag=~s"
|
||
#$fs #$(file-system->mount-tag fs)))
|
||
|
||
#~(;; Only enable kvm if we see /dev/kvm exists.
|
||
;; This allows users without hardware virtualization to still use these
|
||
;; commands.
|
||
#$@(if (file-exists? "/dev/kvm")
|
||
'("-enable-kvm")
|
||
'())
|
||
|
||
"-no-reboot"
|
||
"-net nic,model=virtio"
|
||
|
||
#$@(map virtfs-option shared-fs)
|
||
"-vga std"
|
||
(format #f "-drive file=~a,if=virtio,cache=writeback,werror=report,readonly"
|
||
#$image)))
|
||
|
||
(define* (system-qemu-image/shared-store-script os
|
||
#:key
|
||
(qemu qemu)
|
||
(graphic? #t)
|
||
(memory-size 256)
|
||
(mappings '())
|
||
full-boot?
|
||
(disk-image-size
|
||
(* (if full-boot? 500 70)
|
||
(expt 2 20)))
|
||
(options '()))
|
||
"Return a derivation that builds a script to run a virtual machine image of
|
||
OS that shares its store with the host. The virtual machine runs with
|
||
MEMORY-SIZE MiB of memory.
|
||
|
||
MAPPINGS is a list of <file-system-mapping> specifying mapping of host file
|
||
systems into the guest.
|
||
|
||
When FULL-BOOT? is true, the returned script runs everything starting from the
|
||
bootloader; otherwise it directly starts the operating system kernel. The
|
||
DISK-IMAGE-SIZE parameter specifies the size in bytes of the root disk image;
|
||
it is mostly useful when FULL-BOOT? is true."
|
||
(mlet* %store-monad ((os -> (virtualized-operating-system os mappings full-boot?))
|
||
(os-drv (operating-system-derivation os))
|
||
(image (system-qemu-image/shared-store
|
||
os
|
||
#:full-boot? full-boot?
|
||
#:disk-image-size disk-image-size)))
|
||
(define kernel-arguments
|
||
#~(list #$@(if graphic? #~() #~("console=ttyS0"))
|
||
#+@(operating-system-kernel-arguments os os-drv "/dev/vda1")))
|
||
|
||
(define qemu-exec
|
||
#~(list (string-append #$qemu "/bin/" #$(qemu-command (%current-system)))
|
||
#$@(if full-boot?
|
||
#~()
|
||
#~("-kernel" #$(operating-system-kernel-file os)
|
||
"-initrd" #$(file-append os-drv "/initrd")
|
||
(format #f "-append ~s"
|
||
(string-join #$kernel-arguments " "))))
|
||
#$@(common-qemu-options image
|
||
(map file-system-mapping-source
|
||
(cons %store-mapping mappings)))
|
||
"-m " (number->string #$memory-size)
|
||
#$@options))
|
||
|
||
(define builder
|
||
#~(call-with-output-file #$output
|
||
(lambda (port)
|
||
(format port "#!~a~% exec ~a \"$@\"~%"
|
||
#$(file-append bash "/bin/sh")
|
||
(string-join #$qemu-exec " "))
|
||
(chmod port #o555))))
|
||
|
||
(gexp->derivation "run-vm.sh" builder)))
|
||
|
||
|
||
;;;
|
||
;;; High-level abstraction.
|
||
;;;
|
||
|
||
(define-record-type* <virtual-machine> %virtual-machine
|
||
make-virtual-machine
|
||
virtual-machine?
|
||
(operating-system virtual-machine-operating-system) ;<operating-system>
|
||
(qemu virtual-machine-qemu ;<package>
|
||
(default qemu))
|
||
(graphic? virtual-machine-graphic? ;Boolean
|
||
(default #f))
|
||
(memory-size virtual-machine-memory-size ;integer (MiB)
|
||
(default 256))
|
||
(port-forwardings virtual-machine-port-forwardings ;list of integer pairs
|
||
(default '())))
|
||
|
||
(define-syntax virtual-machine
|
||
(syntax-rules ()
|
||
"Declare a virtual machine running the specified OS, with the given
|
||
options."
|
||
((_ os) ;shortcut
|
||
(%virtual-machine (operating-system os)))
|
||
((_ fields ...)
|
||
(%virtual-machine fields ...))))
|
||
|
||
(define (port-forwardings->qemu-options forwardings)
|
||
"Return the QEMU option for the given port FORWARDINGS as a string, where
|
||
FORWARDINGS is a list of host-port/guest-port pairs."
|
||
(string-join
|
||
(map (match-lambda
|
||
((host-port . guest-port)
|
||
(string-append "hostfwd=tcp::"
|
||
(number->string host-port)
|
||
"-:" (number->string guest-port))))
|
||
forwardings)
|
||
","))
|
||
|
||
(define-gexp-compiler (virtual-machine-compiler (vm <virtual-machine>)
|
||
system target)
|
||
;; XXX: SYSTEM and TARGET are ignored.
|
||
(match vm
|
||
(($ <virtual-machine> os qemu graphic? memory-size ())
|
||
(system-qemu-image/shared-store-script os
|
||
#:qemu qemu
|
||
#:graphic? graphic?
|
||
#:memory-size memory-size))
|
||
(($ <virtual-machine> os qemu graphic? memory-size forwardings)
|
||
(let ((options
|
||
`("-net" ,(string-append
|
||
"user,"
|
||
(port-forwardings->qemu-options forwardings)))))
|
||
(system-qemu-image/shared-store-script os
|
||
#:qemu qemu
|
||
#:graphic? graphic?
|
||
#:memory-size memory-size
|
||
#:options options)))))
|
||
|
||
;;; vm.scm ends here
|