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gnu: vm: Add support for running a VM that shares its store with the host.

* gnu/system/vm.scm (qemu-image): Check whether GUIX is #f.
  (operating-system-build-gid, operating-system-default-contents): New
  procedures.
  (system-qemu-image): Use 'operating-system-build-gid'.
  (system-qemu-image/shared-store,
  system-qemu-image/shared-store-script): New procedures.
* gnu/system.scm: Add missing exports.
version-0.8.3
Ludovic Courtès 9 years ago
parent
commit
fd3bfc44ff
  1. 10
      gnu/system.scm
  2. 125
      gnu/system/vm.scm

10
gnu/system.scm

@ -38,6 +38,16 @@
operating-system?
operating-system-services
operating-system-packages
operating-system-bootloader-entries
operating-system-host-name
operating-system-kernel
operating-system-initrd
operating-system-users
operating-system-groups
operating-system-packages
operating-system-timezone
operating-system-locale
operating-system-services
operating-system-derivation))

125
gnu/system/vm.scm

@ -53,7 +53,9 @@
#:export (expression->derivation-in-linux-vm
qemu-image
system-qemu-image))
system-qemu-image
system-qemu-image/shared-store
system-qemu-image/shared-store-script))
;;; Commentary:
@ -323,8 +325,9 @@ such as /etc files."
;; Optionally, register the inputs in the image's store.
(let* ((guix (assoc-ref %build-inputs "guix"))
(register (string-append guix
"/sbin/guix-register")))
(register (and guix
(string-append guix
"/sbin/guix-register"))))
,@(if initialize-store?
(match inputs-to-copy
(((graph-files . _) ...)
@ -441,6 +444,35 @@ such as /etc files."
tzdata
guix))))
(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."
(mlet* %store-monad ((os-drv (operating-system-derivation os))
(os-dir -> (derivation->output-path os-drv))
(build-user-gid (operating-system-build-gid os)))
(return `((directory "/nix/store" 0 ,(or build-user-gid 0))
(directory "/etc")
(directory "/var/log") ; for dmd
(directory "/var/run/nscd")
(directory "/var/nix/gcroots")
("/var/nix/gcroots/system" -> ,os-dir)
(directory "/tmp")
(directory "/var/nix/profiles/per-user/root" 0 0)
(directory "/var/nix/profiles/per-user/guest"
1000 100)
(directory "/home/guest" 1000 100)))))
(define* (system-qemu-image #:optional (os %demo-operating-system)
#:key (disk-image-size (* 900 (expt 2 20))))
"Return the derivation of a QEMU image of DISK-IMAGE-SIZE bytes of the GNU
@ -449,29 +481,78 @@ system as described by OS."
((os-drv (operating-system-derivation os))
(os-dir -> (derivation->output-path os-drv))
(grub.cfg -> (string-append os-dir "/grub.cfg"))
(build-user-gid (anym %store-monad ; XXX
(lambda (service)
(and (equal? '(guix-daemon)
(service-provision service))
(match (service-user-groups service)
((group)
(user-group-id group)))))
(operating-system-services os)))
(populate -> `((directory "/nix/store" 0 ,build-user-gid)
(directory "/etc")
(directory "/var/log") ; for dmd
(directory "/var/run/nscd")
(directory "/var/nix/gcroots")
("/var/nix/gcroots/system" -> ,os-dir)
(directory "/tmp")
(directory "/var/nix/profiles/per-user/root" 0 0)
(directory "/var/nix/profiles/per-user/guest"
1000 100)
(directory "/home/guest" 1000 100))))
(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
#:optional (os %demo-operating-system)
#: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
#:optional (os %demo-operating-system)
#: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

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