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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 build vm)
+ #:use-module (guix build utils)
+ #:use-module (gnu build linux-initrd)
+ #:use-module (gnu build install)
+ #:use-module (ice-9 match)
+ #:use-module (ice-9 regex)
+ #:use-module (ice-9 rdelim)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-26)
+ #:export (qemu-command
+ load-in-linux-vm
+ format-partition
+ initialize-root-partition
+ initialize-partition-table
+ initialize-hard-disk))
+
+;;; 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 %host-type 0
+ (string-index %host-type #\-))))
+ (string-append "qemu-system-"
+ (if (string-match "^i[3456]86$" cpu)
+ "i386"
+ cpu))))
+
+(define* (load-in-linux-vm builder
+ #:key
+ output
+ (qemu (qemu-command)) (memory-size 512)
+ linux initrd
+ make-disk-image? (disk-image-size 100)
+ (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 MiB 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'."
+ (define image-file
+ (string-append "image." disk-image-format))
+
+ (when make-disk-image?
+ (unless (zero? (system* "qemu-img" "create" "-f" disk-image-format
+ image-file
+ (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)))
+ graph-files))
+ (_ #f))
+
+ (unless (zero?
+ (apply system* qemu "-enable-kvm" "-nographic" "-no-reboot"
+ "-m" (number->string memory-size)
+ "-net" "nic,model=virtio"
+ "-virtfs"
+ (string-append "local,id=store_dev,path="
+ (%store-directory)
+ ",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?
+ `("-drive" ,(string-append "file=" image-file
+ ",if=virtio"))
+ '())))
+ (error "qemu failed" qemu))
+
+ (if make-disk-image?
+ (copy-file image-file output)
+ (begin
+ (mkdir output)
+ (copy-recursively "xchg" output))))
+
+(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* (initialize-partition-table device partition-size
+ #:key
+ (label-type "msdos")
+ (offset (expt 2 20)))
+ "Create on DEVICE a partition table of type LABEL-TYPE, with a single
+partition of PARTITION-SIZE bytes starting at OFFSET bytes. Return #t on
+success."
+ (format #t "creating partition table with a ~a B partition...\n"
+ partition-size)
+ (unless (zero? (system* "parted" device "mklabel" label-type
+ "mkpart" "primary" "ext2"
+ (format #f "~aB" offset)
+ (format #f "~aB" partition-size)))
+ (error "failed to create partition table")))
+
+(define* (populate-store reference-graphs target)
+ "Populate the store under directory TARGET with the items specified in
+REFERENCE-GRAPHS, a list of reference-graph files."
+ (define store
+ (string-append target (%store-directory)))
+
+ (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))
+
+ (delete-duplicates (append-map graph-from-file reference-graphs)))
+
+ (mkdir-p store)
+ (chmod store #o1775)
+ (for-each (lambda (thing)
+ (copy-recursively thing
+ (string-append target thing)))
+ (things-to-copy)))
+
+(define MS_BIND 4096) ; <sys/mounts.h> again!
+
+(define* (format-partition partition type
+ #:key label)
+ "Create a file system 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* (initialize-root-partition target-directory
+ #:key copy-closures? register-closures?
+ closures system-directory)
+ "Initialize the root partition mounted at TARGET-DIRECTORY."
+ (define target-store
+ (string-append target-directory (%store-directory)))
+
+ (when copy-closures?
+ ;; Populate the store.
+ (populate-store (map (cut string-append "/xchg/" <>) closures)
+ target-directory))
+
+ ;; Populate /dev.
+ (make-essential-device-nodes #:root target-directory)
+
+ ;; 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-directory
+ (string-append "/xchg/" closure)))
+ closures)
+ (unless copy-closures?
+ (system* "umount" target-store)))
+
+ ;; Add the non-store directories and files.
+ (display "populating...\n")
+ (populate-root-file-system system-directory target-directory))
+
+(define* (initialize-hard-disk device
+ #:key
+ system-directory
+ grub.cfg
+ disk-image-size
+ (file-system-type "ext4")
+ file-system-label
+ (closures '())
+ copy-closures?
+ (register-closures? #t))
+ "Initialize DEVICE, a disk of DISK-IMAGE-SIZE bytes, with a FILE-SYSTEM-TYPE
+partition with (optionally) FILE-SYSTEM-LABEL as its volume name, and with
+GRUB installed. 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."
+ (define target-directory
+ "/fs")
+
+ (define partition
+ (string-append device "1"))
+
+ (initialize-partition-table device
+ (- disk-image-size (* 5 (expt 2 20))))
+
+ (format-partition partition file-system-type
+ #:label file-system-label)
+
+ (display "mounting partition...\n")
+ (mkdir target-directory)
+ (mount partition target-directory file-system-type)
+
+ (initialize-root-partition target-directory
+ #:system-directory system-directory
+ #:copy-closures? copy-closures?
+ #:register-closures? register-closures?
+ #:closures closures)
+
+ (install-grub grub.cfg device target-directory)
+
+ ;; 'guix-register' resets timestamps and everything, so no need to do it
+ ;; once more in that case.
+ (unless register-closures?
+ (reset-timestamps target-directory))
+
+ (zero? (system* "umount" target-directory)))
+
+;;; vm.scm ends here