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-rw-r--r--doc/guix.texi12
-rw-r--r--gnu/system/vm.scm49
-rw-r--r--guix/scripts/system.scm4
3 files changed, 46 insertions, 19 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 2da956cc73..bc839ecbbb 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -4151,9 +4151,15 @@ Build a virtual machine that contain the operating system declared in
The VM shares its store with the host system.
-On GNU/Linux, the default is to boot directly to the kernel. The
-@code{--full-boot} option forces a complete boot sequence, starting with
-the bootloader.
+On GNU/Linux, the default is to boot directly to the kernel; this has
+the advantage of requiring only a very tiny root disk image since the
+host's store can then be mounted.
+
+The @code{--full-boot} option forces a complete boot sequence, starting
+with the bootloader. This requires more disk space since a root image
+containing at least the kernel, initrd, and bootloader data files must
+be created. The @code{--image-size} option can be used to specify the
+image's size.
@item vm-image
@itemx disk-image
diff --git a/gnu/system/vm.scm b/gnu/system/vm.scm
index c687bb43f5..efe943a7b4 100644
--- a/gnu/system/vm.scm
+++ b/gnu/system/vm.scm
@@ -376,20 +376,31 @@ environment with the store shared with the host."
(define* (system-qemu-image/shared-store
os
- #:key (disk-image-size (* 15 (expt 2 20))))
+ #:key
+ full-boot?
+ (disk-image-size (* (if full-boot? 500 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))
- (grub.cfg (operating-system-grub.cfg os)))
+with the host.
+
+When FULL-BOOT? is true, return an image that does a complete boot sequence,
+bootloaded included; thus, make a disk image that contains everything the
+bootloader refers to: OS kernel, initrd, bootloader data, etc."
+ (mlet* %store-monad ((os-drv (operating-system-derivation os))
+ (grub.cfg (operating-system-grub.cfg os)))
+ ;; XXX: When FULL-BOOT? is true, we end up creating an image that contains
+ ;; GRUB.CFG and all its dependencies, including the output of OS-DRV.
+ ;; This is more than needed (we only need the kernel, initrd, GRUB for its
+ ;; font, and the background image), but it's hard to filter that.
(qemu-image #:os-derivation os-drv
#:grub-configuration grub.cfg
#:disk-image-size disk-image-size
- #:inputs `(("system" ,os-drv))
+ #:inputs (if full-boot?
+ `(("grub.cfg" ,grub.cfg))
+ '())
;; XXX: Passing #t here is too slow, so let it off by default.
#:register-closures? #f
- #:copy-inputs? #f)))
+ #:copy-inputs? full-boot?)))
(define* (common-qemu-options image)
"Return the a string-value gexp with the common QEMU options to boot IMAGE."
@@ -406,15 +417,23 @@ with the host."
#:key
(qemu qemu)
(graphic? #t)
- full-boot?)
+ full-boot?
+ (disk-image-size
+ (* (if full-boot? 500 15)
+ (expt 2 20))))
"Return a derivation that builds a script to run a virtual machine image of
-OS that shares its store with the host. When FULL-BOOT? is true, the returned
-script runs everything starting from the bootloader; otherwise it directly
-starts the operating system kernel."
- (mlet* %store-monad
- ((os -> (virtualized-operating-system os))
- (os-drv (operating-system-derivation os))
- (image (system-qemu-image/shared-store os)))
+OS that shares its store with the host.
+
+When FULL-BOOT? is true, the returned script runs everything starting from the
+bootloader; otherwise it directly starts the operating system kernel. The
+DISK-IMAGE-SIZE parameter specifies the size in bytes of the root disk image;
+it is mostly useful when FULL-BOOT? is true."
+ (mlet* %store-monad ((os -> (virtualized-operating-system os))
+ (os-drv (operating-system-derivation os))
+ (image (system-qemu-image/shared-store
+ os
+ #:full-boot? full-boot?
+ #:disk-image-size disk-image-size)))
(define builder
#~(call-with-output-file #$output
(lambda (port)
diff --git a/guix/scripts/system.scm b/guix/scripts/system.scm
index 7eb86c293d..ebad13e5e0 100644
--- a/guix/scripts/system.scm
+++ b/guix/scripts/system.scm
@@ -258,7 +258,9 @@ it atomically, and then run OS's activation script."
((vm-image)
(system-qemu-image os #:disk-image-size image-size))
((vm)
- (system-qemu-image/shared-store-script os #:full-boot? full-boot?))
+ (system-qemu-image/shared-store-script os
+ #:full-boot? full-boot?
+ #:disk-image-size image-size))
((disk-image)
(system-disk-image os #:disk-image-size image-size))))