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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014 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 config)
#:use-module (guix store)
#:use-module (guix derivations)
#:use-module (guix packages)
#:use-module (guix monads)
#:use-module ((gnu packages base)
#:select (%final-inputs
guile-final gcc-final glibc-final
ld-wrapper binutils-final
coreutils findutils grep sed tzdata))
#:use-module (gnu packages guile)
#:use-module (gnu packages bash)
#:use-module (gnu packages less)
#:use-module (gnu packages qemu)
#:use-module (gnu packages parted)
#:use-module (gnu packages zile)
#:use-module (gnu packages grub)
#:use-module (gnu packages linux)
#:use-module (gnu packages package-management)
#:use-module ((gnu packages make-bootstrap)
#:select (%guile-static-stripped))
#:use-module (gnu packages admin)
#:use-module (gnu system shadow)
#:use-module (gnu system linux)
#:use-module (gnu system linux-initrd)
#:use-module (gnu system grub)
#:use-module (gnu system)
#:use-module (gnu services)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (ice-9 match)
#:export (expression->derivation-in-linux-vm
qemu-image
system-qemu-image
system-qemu-image/shared-store
system-qemu-image/shared-store-script))
;;; Commentary:
;;;
;;; Tools to evaluate build expressions within virtual machines.
;;;
;;; Code:
(define* (expression->derivation-in-linux-vm name exp
#:key
(system (%current-system))
(inputs '())
(linux linux-libre)
initrd
(qemu qemu-headless)
(env-vars '())
(modules '())
(guile-for-build
(%guile-for-build))
(make-disk-image? #f)
(references-graphs #f)
(disk-image-size
(* 100 (expt 2 20))))
"Evaluate EXP in a QEMU virtual machine running LINUX with INITRD (a
derivation). 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.
When REFERENCES-GRAPHS is true, it must be a list of file name/store path
pairs, as for `derivation'. The files containing the reference graphs are
made available under the /xchg CIFS share."
;; FIXME: Allow use of macros from other modules, as done in
;; `build-expression->derivation'.
(define input-alist
(with-monad %store-monad
(map (match-lambda
((input (? package? package))
(mlet %store-monad ((out (package-file package #:system system)))
(return `(,input . ,out))))
((input (? package? package) sub-drv)
(mlet %store-monad ((out (package-file package
#:output sub-drv
#:system system)))
(return `(,input . ,out))))
((input (? derivation? drv))
(return `(,input . ,(derivation->output-path drv))))
((input (? derivation? drv) sub-drv)
(return `(,input . ,(derivation->output-path drv sub-drv))))
((input (and (? string?) (? store-path?) file))
(return `(,input . ,file))))
inputs)))
(define builder
;; Code that launches the VM that evaluates EXP.
`(let ()
(use-modules (guix build utils)
(srfi srfi-1)
(ice-9 rdelim))
(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" "-f" "qcow2" "image.qcow2"
,(number->string disk-image-size)))
'(begin))
(mkdir "xchg")
;; Copy the reference-graph files under xchg/ so EXP can access it.
(begin
,@(match references-graphs
(((graph-files . _) ...)
(map (lambda (file)
`(copy-file ,file
,(string-append "xchg/" file)))
graph-files))
(#f '())))
(and (zero?
(system* qemu "-enable-kvm" "-nographic" "-no-reboot"
"-net" "nic,model=virtio"
"-virtfs"
,(string-append "local,id=store_dev,path=" (%store-prefix)
",security_model=none,mount_tag=store")
"-virtfs"
,(string-append "local,id=xchg_dev,path=xchg"
",security_model=none,mount_tag=xchg")
"-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)))))))
(mlet* %store-monad
((input-alist (sequence %store-monad input-alist))
(exp* -> `(let ((%build-inputs ',input-alist))
,exp))
(user-builder (text-file "builder-in-linux-vm"
(object->string exp*)))
(coreutils -> (car (assoc-ref %final-inputs "coreutils")))
(initrd (if initrd ; use the default initrd?
(return initrd)
(qemu-initrd #:guile-modules-in-chroot? #t
#:mounts `((9p "store" ,(%store-prefix))
(9p "xchg" "/xchg")))))
(inputs (lower-inputs `(("qemu" ,qemu)
("linux" ,linux)
("initrd" ,initrd)
("coreutils" ,coreutils)
("builder" ,user-builder)
,@inputs))))
(derivation-expression name builder
;; TODO: Require the "kvm" feature.
#:system system
#:inputs inputs
#:env-vars env-vars
#:modules (delete-duplicates
`((guix build utils)
,@modules))
#:guile-for-build guile-for-build
#:references-graphs references-graphs)))
(define* (qemu-image #:key
(name "qemu-image")
(system (%current-system))
(disk-image-size (* 100 (expt 2 20)))
grub-configuration
(initialize-store? #f)
(populate #f)
(inputs '())
(inputs-to-copy '()))
"Return a bootable, stand-alone QEMU image. The returned image is a full
disk image, with a GRUB installation that uses GRUB-CONFIGURATION as its
configuration file (GRUB-CONFIGURATION must be the name of a file in the VM.)
INPUTS-TO-COPY is a list of inputs (as for packages) whose closure is copied
into the image being built. When INITIALIZE-STORE? is true, initialize the
store database in the image so that Guix can be used in the image.
POPULATE is a list of directives stating directories or symlinks to be created
in the disk image partition. It is evaluated once the image has been
populated with INPUTS-TO-COPY. It can be used to provide additional files,
such as /etc files."
(define (input->name+derivation tuple)
(with-monad %store-monad
(match tuple
((name (? package? package))
(mlet %store-monad ((drv (package->derivation package system)))
(return `(,name . ,(derivation->output-path drv)))))
((name (? package? package) sub-drv)
(mlet %store-monad ((drv (package->derivation package system)))
(return `(,name . ,(derivation->output-path drv sub-drv)))))
((name (? derivation? drv))
(return `(,name . ,(derivation->output-path drv))))
((name (? derivation? drv) sub-drv)
(return `(,name . ,(derivation->output-path drv sub-drv))))
((input (and (? string?) (? store-path?) file))
(return `(,input . ,file))))))
(mlet %store-monad
((graph (sequence %store-monad
(map input->name+derivation inputs-to-copy))))
(expression->derivation-in-linux-vm
"qemu-image"
`(let ()
(use-modules (ice-9 rdelim)
(srfi srfi-1)
(guix build utils)
(guix build linux-initrd))
(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
(grub.cfg ,grub-configuration))
(define (read-reference-graph port)
;; Return a list of store paths from the reference graph at PORT.
;; The data at PORT is the format produced by #:references-graphs.
(let loop ((line (read-line port))
(result '()))
(cond ((eof-object? line)
(delete-duplicates result))
((string-prefix? "/" line)
(loop (read-line port)
(cons line result)))
(else
(loop (read-line port)
result)))))
(define (things-to-copy)
;; Return the list of store files to copy to the image.
(define (graph-from-file file)
(call-with-input-file file
read-reference-graph))
,(match inputs-to-copy
(((graph-files . _) ...)
`(let* ((graph-files ',(map (cut string-append "/xchg/" <>)
graph-files))
(paths (append-map graph-from-file graph-files)))
(delete-duplicates paths)))
(#f ''())))
;; 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")
(and (zero? (system* parted "/dev/sda" "mklabel" "msdos"
"mkpart" "primary" "ext2" "1MiB"
,(format #f "~aB"
(- disk-image-size
(* 5 (expt 2 20))))))
(begin
(display "creating ext3 partition...\n")
(and (zero? (system* mkfs "-F" "/dev/sda1"))
(let ((store (string-append "/fs" ,(%store-prefix))))
(display "mounting partition...\n")
(mkdir "/fs")
(mount "/dev/sda1" "/fs" "ext3")
(mkdir-p "/fs/boot/grub")
(symlink grub.cfg "/fs/boot/grub/grub.cfg")
;; Populate the image's store.
(mkdir-p store)
(chmod store #o1775)
(for-each (lambda (thing)
(copy-recursively thing
(string-append "/fs"
thing)))
(things-to-copy))
;; Populate /dev.
(make-essential-device-nodes #:root "/fs")
;; Optionally, register the inputs in the image's store.
(let* ((guix (assoc-ref %build-inputs "guix"))
(register (and guix
(string-append guix
"/sbin/guix-register"))))
,@(if initialize-store?
(match inputs-to-copy
(((graph-files . _) ...)
(map (lambda (closure)
`(system* register "--prefix" "/fs"
,(string-append "/xchg/"
closure)))
graph-files)))
'(#f)))
;; Evaluate the POPULATE directives.
,@(let loop ((directives populate)
(statements '()))
(match directives
(()
(reverse statements))
((('directory name) rest ...)
(loop rest
(cons `(mkdir-p ,(string-append "/fs" name))
statements)))
((('directory name uid gid) rest ...)
(let ((dir (string-append "/fs" name)))
(loop rest
(cons* `(chown ,dir ,uid ,gid)
`(mkdir-p ,dir)
statements))))
(((new '-> old) rest ...)
(loop rest
(cons `(symlink ,old
,(string-append "/fs" new))
statements)))))
(and=> (assoc-ref %build-inputs "populate")
(lambda (populate)
(chdir "/fs")
(primitive-load populate)
(chdir "/")))
(display "clearing file timestamps...\n")
(for-each (lambda (file)
(let ((s (lstat file)))
;; XXX: Guile uses libc's 'utime' function
;; (not 'futime'), so the timestamp of
;; symlinks cannot be changed, and there
;; are symlinks here pointing to
;; /gnu/store, which is the host,
;; read-only store.
(unless (eq? (stat:type s) 'symlink)
(utime file 0 0 0 0))))
(find-files "/fs" ".*"))
(and (zero?
(system* grub "--no-floppy"
"--boot-directory" "/fs/boot"
"/dev/sda"))
(begin
(when (file-exists? "/fs/dev/pts")
;; Unmount devpts so /fs itself can be
;; unmounted (failing to do that leads to
;; EBUSY.)
(system* umount "/fs/dev/pts"))
(zero? (system* umount "/fs")))
(reboot))))))))
#:system system
#:inputs `(("parted" ,parted)
("grub" ,grub)
("e2fsprogs" ,e2fsprogs)
;; 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)
,@(if initialize-store?
`(("guix" ,guix))
'())
,@inputs-to-copy)
#:make-disk-image? #t
#:disk-image-size disk-image-size
#:references-graphs graph
#:modules '((guix build utils)
(guix build linux-initrd)))))
;;;
;;; Stand-alone VM image.
;;;
(define (operating-system-build-gid os)
"Return as a monadic value the group id for build users of OS, or #f."
(anym %store-monad
(lambda (service)
(and (equal? '(guix-daemon)
(service-provision service))
(match (service-user-groups service)
((group)
(user-group-id group)))))
(operating-system-services os)))
(define (operating-system-default-contents os)
"Return a list of directives suitable for 'system-qemu-image' describing the
basic contents of the root file system of OS."
(define (user-directories user)
(let ((home (user-account-home-directory user))
;; XXX: Deal with automatically allocated ids.
(uid (or (user-account-uid user) 0))
(gid (or (user-account-gid user) 0))
(root (string-append "/var/nix/profiles/per-user/"
(user-account-name user))))
`((directory ,root ,uid ,gid)
(directory ,home ,uid ,gid))))
(mlet* %store-monad ((os-drv (operating-system-derivation os))
(os-dir -> (derivation->output-path os-drv))
(build-gid (operating-system-build-gid os))
(profile (operating-system-profile-directory os)))
(return `((directory ,(%store-prefix) 0 ,(or build-gid 0))
(directory "/etc")
(directory "/var/log") ; for dmd
(directory "/var/run/nscd")
(directory "/var/nix/gcroots")
("/var/nix/gcroots/system" -> ,os-dir)
(directory "/run")
("/run/current-system" -> ,profile)
(directory "/bin")
("/bin/sh" -> "/run/current-system/bin/bash")
(directory "/tmp")
(directory "/var/nix/profiles/per-user/root" 0 0)
(directory "/root" 0 0) ; an exception
,@(append-map user-directories
(operating-system-users os))))))
(define* (system-qemu-image os
#:key (disk-image-size (* 900 (expt 2 20))))
"Return the derivation of a QEMU image of DISK-IMAGE-SIZE bytes of the GNU
system as described by OS."
(mlet* %store-monad
((os-drv (operating-system-derivation os))
(os-dir -> (derivation->output-path os-drv))
(grub.cfg -> (string-append os-dir "/grub.cfg"))
(populate (operating-system-default-contents os)))
(qemu-image #:grub-configuration grub.cfg
#:populate populate
#:disk-image-size disk-image-size
#:initialize-store? #t
#:inputs-to-copy `(("system" ,os-drv)))))
(define* (system-qemu-image/shared-store
os
#:key (disk-image-size (* 15 (expt 2 20))))
"Return a derivation that builds a QEMU image of OS that shares its store
with the host."
(mlet* %store-monad
((os-drv (operating-system-derivation os))
(os-dir -> (derivation->output-path os-drv))
(grub.cfg -> (string-append os-dir "/grub.cfg"))
(populate (operating-system-default-contents os)))
;; TODO: Initialize the database so Guix can be used in the guest.
(qemu-image #:grub-configuration grub.cfg
#:populate populate
#:disk-image-size disk-image-size)))
(define* (system-qemu-image/shared-store-script
os
#:key
(qemu (package (inherit qemu)
;; FIXME/TODO: Use 9p instead of this hack.
(source (package-source qemu/smb-shares))))
(graphic? #t))
"Return a derivation that builds a script to run a virtual machine image of
OS that shares its store with the host."
(let* ((initrd (qemu-initrd #:mounts `((cifs "/store" ,(%store-prefix)))
#:volatile-root? #t))
(os (operating-system (inherit os) (initrd initrd))))
(define builder
(mlet %store-monad ((image (system-qemu-image/shared-store os))
(qemu (package-file qemu
"bin/qemu-system-x86_64"))
(bash (package-file bash "bin/sh"))
(kernel (package-file (operating-system-kernel os)
"bzImage"))
(initrd initrd)
(os-drv (operating-system-derivation os)))
(return `(let ((out (assoc-ref %outputs "out")))
(call-with-output-file out
(lambda (port)
(display
(string-append "#!" ,bash "
# TODO: -virtfs local,path=XXX,security_model=none,mount_tag=store
exec " ,qemu " -enable-kvm -no-reboot -net nic,model=virtio \
-net user,smb=$PWD \
-kernel " ,kernel " -initrd "
,(string-append (derivation->output-path initrd) "/initrd") " \
-append \"" ,(if graphic? "" "console=ttyS0 ")
"--load=" ,(derivation->output-path os-drv) "/boot --root=/dev/vda1\" \
-drive file=" ,(derivation->output-path image)
",if=virtio,cache=writeback,werror=report,readonly\n")
port)))
(chmod out #o555)
#t))))
(mlet %store-monad ((image (system-qemu-image/shared-store os))
(initrd initrd)
(qemu (package->derivation qemu))
(bash (package->derivation bash))
(os (operating-system-derivation os))
(builder builder))
(derivation-expression "run-vm.sh" builder
#:inputs `(("qemu" ,qemu)
("image" ,image)
("bash" ,bash)
("initrd" ,initrd)
("os" ,os))))))
;;; vm.scm ends here