Mirror of GNU Guix
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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016 Christopher Allan Webber <cwebber@dustycloud.org>
;;; Copyright © 2016 Leo Famulari <leo@famulari.name>
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2017 Marius Bakke <mbakke@fastmail.com>
;;; This file is part of GNU Guix.
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; GNU General Public License for more details.
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (gnu build vm)
#:use-module (guix build utils)
#:use-module (guix build store-copy)
#:use-module (guix build syscalls)
#:use-module (gnu build linux-boot)
#:use-module (gnu build install)
#:use-module (guix records)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:use-module (ice-9 regex)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-26)
#:export (qemu-command
;;; Commentary:
;;; This module provides supporting code to run virtual machines and build
;;; virtual machine images using QEMU.
;;; Code:
(define* (qemu-command #:optional (system %host-type))
"Return the default name of the QEMU command for SYSTEM."
(let ((cpu (substring system 0
(string-index system #\-))))
(string-append "qemu-system-"
(if (string-match "^i[3456]86$" cpu)
(define* (load-in-linux-vm builder
(qemu (qemu-command)) (memory-size 512)
linux initrd
(disk-image-size (* 100 (expt 2 20)))
(disk-image-format "qcow2")
(references-graphs '()))
"Run BUILDER, a Scheme file, into a VM running LINUX with INITRD, and copy
the result to OUTPUT.
When MAKE-DISK-IMAGE? is true, OUTPUT will contain a VM image of
DISK-IMAGE-SIZE bytes resulting from the execution of BUILDER, which may
access it via /dev/hda.
REFERENCES-GRAPHS can specify a list of reference-graph files as produced by
the #:references-graphs parameter of 'derivation'."
(when make-disk-image?
(format #t "creating ~a image of ~,2f MiB...~%"
disk-image-format (/ disk-image-size (expt 2 20)))
(unless (zero? (system* "qemu-img" "create" "-f" disk-image-format
(number->string disk-image-size)))
(error "qemu-img failed")))
(mkdir "xchg")
(match references-graphs
((graph-files ...)
;; Copy the reference-graph files under xchg/ so EXP can access it.
(map (lambda (file)
(copy-file file (string-append "xchg/" file)))
(_ #f))
(unless (zero?
(apply system* qemu "-nographic" "-no-reboot"
"-m" (number->string memory-size)
"-net" "nic,model=virtio"
(string-append "local,id=store_dev,path="
(string-append "local,id=xchg_dev,path=xchg"
"-kernel" linux
"-initrd" initrd
"-append" (string-append "console=ttyS0 --load="
(if make-disk-image?
`("-drive" ,(string-append "file=" output
;; 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")
(error "qemu failed" qemu))
;; When MAKE-DISK-IMAGE? is true, the image is in OUTPUT already.
(unless make-disk-image?
(mkdir output)
(copy-recursively "xchg" output)))
;;; Partitions.
(define-record-type* <partition> partition make-partition
(device partition-device (default #f))
(size partition-size)
(file-system partition-file-system (default "ext4"))
(label partition-label (default #f))
(flags partition-flags (default '()))
(initializer partition-initializer (default (const #t))))
(define (estimated-partition-size graphs)
"Return the estimated size of a partition that can store the store items
given by GRAPHS, a list of file names produced by #:references-graphs."
;; Simply add a 20% overhead.
(round (* 1.2 (closure-size graphs))))
(define (fold2 proc seed1 seed2 lst) ;TODO: factorize
"Like `fold', but with a single list and two seeds."
(let loop ((result1 seed1)
(result2 seed2)
(lst lst))
(if (null? lst)
(values result1 result2)
(lambda () (proc (car lst) result1 result2))
(lambda (result1 result2)
(loop result1 result2 (cdr lst)))))))
(define* (initialize-partition-table device partitions
(label-type "msdos")
(offset (expt 2 20)))
"Create on DEVICE a partition table of type LABEL-TYPE, containing the given
PARTITIONS (a list of <partition> objects), starting at OFFSET bytes. On
success, return PARTITIONS with their 'device' field changed to reflect their
actual /dev name based on DEVICE."
(define (partition-options part offset index)
(cons* "mkpart" "primary" "ext2"
(format #f "~aB" offset)
(format #f "~aB" (+ offset (partition-size part)))
(append-map (lambda (flag)
(list "set" (number->string index)
(symbol->string flag) "on"))
(partition-flags part))))
(define (options partitions offset)
(let loop ((partitions partitions)
(offset offset)
(index 1)
(result '()))
(match partitions
(concatenate (reverse result)))
((head tail ...)
(loop tail
;; Leave one sector (512B) between partitions to placate
;; Parted.
(+ offset 512 (partition-size head))
(+ 1 index)
(cons (partition-options head offset index)
(format #t "creating partition table with ~a partitions (~a)...\n"
(length partitions)
(string-join (map (compose (cut string-append <> " MiB")
(lambda (size)
(round (/ size (expt 2. 20))))
", "))
(unless (zero? (apply system* "parted" "--script"
device "mklabel" label-type
(options partitions offset)))
(error "failed to create partition table"))
;; Set the 'device' field of each partition.
(fold2 (lambda (part result index)
(values (cons (partition
(inherit part)
(device (string-append device
(number->string index))))
(+ 1 index)))
(define MS_BIND 4096) ; <sys/mounts.h> again!
(define* (create-ext-file-system partition type
#:key label)
"Create an ext-family filesystem of TYPE on PARTITION. If LABEL is true,
use that as the volume name."
(format #t "creating ~a partition...\n" type)
(unless (zero? (apply system* (string-append "mkfs." type)
"-F" partition
(if label
`("-L" ,label)
(error "failed to create partition")))
(define* (create-fat-file-system partition
#:key label)
"Create a FAT filesystem on PARTITION. The number of File Allocation Tables
will be determined based on filesystem size. If LABEL is true, use that as the
volume name."
(format #t "creating FAT partition...\n")
(unless (zero? (apply system* "mkfs.fat" partition
(if label
`("-n" ,label)
(error "failed to create FAT partition")))
(define* (format-partition partition type
#:key label)
"Create a file system TYPE on PARTITION. If LABEL is true, use that as the
volume name."
(cond ((string-prefix? "ext" type)
(create-ext-file-system partition type #:label label))
((or (string-prefix? "fat" type) (string= "vfat" type))
(create-fat-file-system partition #:label label))
(else (error "Unsupported file system."))))
(define (initialize-partition partition)
"Format PARTITION, a <partition> object with a non-#f 'device' field, mount
it, run its initializer, and unmount it."
(let ((target "/fs"))
(format-partition (partition-device partition)
(partition-file-system partition)
#:label (partition-label partition))
(mkdir-p target)
(mount (partition-device partition) target
(partition-file-system partition))
((partition-initializer partition) target)
(umount target)
(define* (root-partition-initializer #:key (closures '())
(register-closures? #t)
"Return a procedure to initialize a root partition.
If REGISTER-CLOSURES? is true, register all of CLOSURES is the partition's
store. If COPY-CLOSURES? is true, copy all of CLOSURES to the partition.
SYSTEM-DIRECTORY is the name of the directory of the 'system' derivation."
(lambda (target)
(define target-store
(string-append target (%store-directory)))
(when copy-closures?
;; Populate the store.
(populate-store (map (cut string-append "/xchg/" <>) closures)
;; Populate /dev.
(make-essential-device-nodes #:root target)
;; Optionally, register the inputs in the image's store.
(when register-closures?
(unless copy-closures?
;; XXX: 'guix-register' wants to palpate the things it registers, so
;; bind-mount the store on the target.
(mkdir-p target-store)
(mount (%store-directory) target-store "" MS_BIND))
(display "registering closures...\n")
(for-each (lambda (closure)
(register-closure target
(string-append "/xchg/" closure)))
(unless copy-closures?
(umount target-store)))
;; Add the non-store directories and files.
(display "populating...\n")
(populate-root-file-system system-directory target)
;; 'guix-register' resets timestamps and everything, so no need to do it
;; once more in that case.
(unless register-closures?
(reset-timestamps target))))
(define (register-bootcfg-root target bootcfg)
"On file system TARGET, register BOOTCFG as a GC root."
(let ((directory (string-append target "/var/guix/gcroots")))
(mkdir-p directory)
(symlink bootcfg (string-append directory "/bootcfg"))))
(define (install-efi grub esp config-file)
"Write a self-contained GRUB EFI loader to the mounted ESP using CONFIG-FILE."
(let* ((system %host-type)
;; Hard code the output location to a well-known path recognized by
;; compliant firmware. See " Removable Media Boot Behaviour":
;; http://www.uefi.org/sites/default/files/resources/UEFI%20Spec%202_6.pdf
(grub-mkstandalone (string-append grub "/bin/grub-mkstandalone"))
(efi-directory (string-append esp "/EFI/BOOT"))
;; Map grub target names to boot file names.
(efi-targets (cond ((string-prefix? "x86_64" system)
'("x86_64-efi" . "BOOTX64.EFI"))
((string-prefix? "i686" system)
'("i386-efi" . "BOOTIA32.EFI"))
((string-prefix? "armhf" system)
'("arm-efi" . "BOOTARM.EFI"))
((string-prefix? "aarch64" system)
'("arm64-efi" . "BOOTAA64.EFI")))))
;; grub-mkstandalone requires a TMPDIR to prepare the firmware image.
(setenv "TMPDIR" esp)
(mkdir-p efi-directory)
(unless (zero? (system* grub-mkstandalone "-O" (car efi-targets)
"-o" (string-append efi-directory "/"
(cdr efi-targets))
;; Graft the configuration file onto the image.
(string-append "boot/grub/grub.cfg=" config-file)))
(error "failed to create GRUB EFI image"))))
(define* (initialize-hard-disk device
(grub-efi #f)
(partitions '()))
"Initialize DEVICE as a disk containing all the <partition> objects listed
in PARTITIONS, and using BOOTCFG as its bootloader configuration file.
Each partition is initialized by calling its 'initializer' procedure,
passing it a directory name where it is mounted."
(define (partition-bootable? partition)
"Return the first partition found with the boot flag set."
(member 'boot (partition-flags partition)))
(define (partition-esp? partition)
"Return the first EFI System Partition."
(member 'esp (partition-flags partition)))
(let* ((partitions (initialize-partition-table device partitions))
(root (find partition-bootable? partitions))
(esp (find partition-esp? partitions))
(target "/fs"))
(unless root
(error "no bootable partition specified" partitions))
(for-each initialize-partition partitions)
(display "mounting root partition...\n")
(mkdir-p target)
(mount (partition-device root) target (partition-file-system root))
(install-boot-config bootcfg bootcfg-location target)
(when bootloader-installer
(display "installing bootloader...\n")
(bootloader-installer bootloader-package device target))
(when esp
;; Mount the ESP somewhere and install GRUB UEFI image.
(let ((mount-point (string-append target "/boot/efi"))
(grub-config (string-append target "/tmp/grub-standalone.cfg")))
(display "mounting EFI system partition...\n")
(mkdir-p mount-point)
(mount (partition-device esp) mount-point
(partition-file-system esp))
;; Create a tiny configuration file telling the embedded grub
;; where to load the real thing.
(call-with-output-file grub-config
(lambda (port)
(format port
"insmod part_msdos~@
search --set=root --label gnu-disk-image~@
configfile /boot/grub/grub.cfg~%")))
(display "creating EFI firmware image...")
(install-efi grub-efi mount-point grub-config)
(display "done.\n")
(delete-file grub-config)
(umount mount-point)))
;; Register BOOTCFG as a GC root.
(register-bootcfg-root target bootcfg)
(umount target)))
;;; vm.scm ends here