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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
;;;
;;; 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
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; 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 system vm)
#:use-module (guix store)
#:use-module (guix derivations)
#:use-module (guix packages)
#:use-module ((gnu packages base) #:select (%final-inputs guile-final))
#:use-module (gnu packages qemu)
#:use-module (gnu packages parted)
#:use-module (gnu packages grub)
#:use-module (gnu packages linux)
#:use-module (gnu packages linux-initrd)
#:use-module ((gnu packages make-bootstrap)
#:select (%guile-static-stripped))
#:use-module (srfi srfi-26)
#:use-module (ice-9 match)
#:export (expression->derivation-in-linux-vm
qemu-image))
;;; Commentary:
;;;
;;; Tools to evaluate build expressions within virtual machines.
;;;
;;; Code:
(define* (expression->derivation-in-linux-vm store name system exp inputs
#:key
(linux linux-libre)
(initrd qemu-initrd)
(qemu qemu/smb-shares)
(env-vars '())
(modules '())
(guile-for-build
(%guile-for-build))
(make-disk-image? #f)
(disk-image-size
(* 100 (expt 2 20))))
"Evaluate EXP in a QEMU virtual machine running LINUX with INITRD. In the
virtual machine, EXP has access to all of INPUTS from the store; it should put
its output files in the `/xchg' directory, which is copied to the derivation's
output when the VM terminates.
When MAKE-DISK-IMAGE? is true, then create a QEMU disk image of
DISK-IMAGE-SIZE bytes and return it."
(define input-alist
(map (match-lambda
((input package)
`(,input . ,(package-output store package "out" system)))
((input package sub-drv)
`(,input . ,(package-output store package sub-drv system))))
inputs))
(define exp*
;; EXP, but with INPUTS available.
`(let ((%build-inputs ',input-alist))
,exp))
(define builder
;; Code that launches the VM that evaluates EXP.
`(begin
(use-modules (guix build utils))
(let ((out (assoc-ref %outputs "out"))
(cu (string-append (assoc-ref %build-inputs "coreutils")
"/bin"))
(qemu (string-append (assoc-ref %build-inputs "qemu")
"/bin/qemu-system-"
(car (string-split ,system #\-))))
(img (string-append (assoc-ref %build-inputs "qemu")
"/bin/qemu-img"))
(linux (string-append (assoc-ref %build-inputs "linux")
"/bzImage"))
(initrd (string-append (assoc-ref %build-inputs "initrd")
"/initrd"))
(builder (assoc-ref %build-inputs "builder")))
;; XXX: QEMU uses "rm -rf" when it's done to remove the temporary SMB
;; directory, so it really needs `rm' in $PATH.
(setenv "PATH" cu)
,(if make-disk-image?
`(zero? (system* img "create" "image.qcow2"
,(number->string disk-image-size)))
'(begin))
(mkdir "xchg")
(and (zero?
(system* qemu "-nographic" "-no-reboot"
"-net" "nic,model=e1000"
"-net" (string-append "user,smb=" (getcwd))
"-kernel" linux
"-initrd" initrd
"-append" (string-append "console=ttyS0 --load="
builder)
,@(if make-disk-image?
'("-hda" "image.qcow2")
'())))
,(if make-disk-image?
'(copy-file "image.qcow2" ; XXX: who mkdir'd OUT?
out)
'(begin
(mkdir out)
(copy-recursively "xchg" out)))))))
(let ((user-builder (add-text-to-store store "builder-in-linux-vm"
(object->string exp*)
'()))
(->drv (cut package-derivation store <> system))
(coreutils (car (assoc-ref %final-inputs "coreutils"))))
(build-expression->derivation store name system builder
`(("qemu" ,(->drv qemu))
("linux" ,(->drv linux))
("initrd" ,(->drv initrd))
("coreutils" ,(->drv coreutils))
("builder" ,user-builder)
,@(map (match-lambda
((name package sub-drv ...)
`(,name ,(->drv package)
,@sub-drv)))
inputs))
#:env-vars env-vars
#:modules `((guix build utils)
,@modules)
#:guile-for-build guile-for-build)))
(define* (qemu-image store #:key
(name "qemu-image")
(system (%current-system))
(disk-image-size (* 100 (expt 2 20)))
(linux linux-libre)
(initrd qemu-initrd)
(inputs '()))
"Return a bootable, stand-alone QEMU image."
(expression->derivation-in-linux-vm
store "qemu-image" system
`(let ((parted (string-append (assoc-ref %build-inputs "parted")
"/sbin/parted"))
(mkfs (string-append (assoc-ref %build-inputs "e2fsprogs")
"/sbin/mkfs.ext3"))
(grub (string-append (assoc-ref %build-inputs "grub")
"/sbin/grub-install"))
(umount (string-append (assoc-ref %build-inputs "util-linux")
"/bin/umount")) ; XXX: add to Guile
(initrd (string-append (assoc-ref %build-inputs "initrd")
"/initrd"))
(linux (string-append (assoc-ref %build-inputs "linux")
"/bzImage"))
(makedev (lambda (major minor)
(+ (* major 256) minor))))
;; GRUB is full of shell scripts.
(setenv "PATH"
(string-append (dirname grub) ":"
(assoc-ref %build-inputs "coreutils") "/bin:"
(assoc-ref %build-inputs "findutils") "/bin:"
(assoc-ref %build-inputs "sed") "/bin:"
(assoc-ref %build-inputs "grep") "/bin:"
(assoc-ref %build-inputs "gawk") "/bin"))
(display "creating partition table...\n")
(mknod "/dev/vda" 'block-special #o644 (makedev 8 0))
(and (zero? (system* parted "/dev/vda" "mklabel" "msdos"
"mkpart" "primary" "ext2" "1MiB"
,(format #f "~aB"
(- disk-image-size
(* 5 (expt 2 20))))))
(begin
(display "creating ext3 partition...\n")
(mknod "/dev/vda1" 'block-special #o644 (makedev 8 1))
(and (zero? (system* mkfs "-F" "/dev/vda1"))
(begin
(display "mounting partition...\n")
(mkdir "/fs")
(mount "/dev/vda1" "/fs" "ext3")
(mkdir "/fs/boot")
(mkdir "/fs/boot/grub")
(copy-file linux "/fs/boot/bzImage")
(copy-file initrd "/fs/boot/initrd")
(call-with-output-file "/fs/boot/grub/grub.cfg"
(lambda (p)
(display "
set default=1
set timeout=5
search.file /boot/bzImage
menuentry \"Boot-to-Guile! (GNU System technology preview)\" {
linux /boot/bzImage --repl
initrd /boot/initrd
}" p)))
(and (zero?
(system* grub "--no-floppy"
"--boot-directory" "/fs/boot"
"/dev/vda"))
(zero?
(system* umount "/fs"))
(reboot)))))))
`(("parted" ,parted)
("grub" ,grub)
("e2fsprogs" ,e2fsprogs)
("linux" ,linux-libre)
("initrd" ,qemu-initrd)
;; For shell scripts.
("sed" ,(car (assoc-ref %final-inputs "sed")))
("grep" ,(car (assoc-ref %final-inputs "grep")))
("coreutils" ,(car (assoc-ref %final-inputs "coreutils")))
("findutils" ,(car (assoc-ref %final-inputs "findutils")))
("gawk" ,(car (assoc-ref %final-inputs "gawk")))
("util-linux" ,util-linux))
#:make-disk-image? #t
#:disk-image-size disk-image-size))
;;;
;;; Guile 2.0 potluck examples.
;;;
(define (example1)
(let ((store #f))
(dynamic-wind
(lambda ()
(set! store (open-connection)))
(lambda ()
(parameterize ((%guile-for-build (package-derivation store guile-final)))
(expression->derivation-in-linux-vm
store "vm-test" (%current-system)
'(begin
(display "hello from boot!\n")
(call-with-output-file "/xchg/hello"
(lambda (p)
(display "world" p))))
'())))
(lambda ()
(close-connection store)))))
(define (example2)
(let ((store #f))
(dynamic-wind
(lambda ()
(set! store (open-connection)))
(lambda ()
(parameterize ((%guile-for-build (package-derivation store guile-final)))
(qemu-image store #:disk-image-size (* 30 (expt 2 20)))))
(lambda ()
(close-connection store)))))
;;; vm.scm ends here
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