diff options
| -rw-r--r-- | gnu/system/vm.scm | 77 |
1 files changed, 54 insertions, 23 deletions
diff --git a/gnu/system/vm.scm b/gnu/system/vm.scm index 2487539b61..db5c4132c0 100644 --- a/gnu/system/vm.scm +++ b/gnu/system/vm.scm @@ -51,6 +51,8 @@ #:use-module (gnu bootloader) #:use-module (gnu bootloader grub) + #:use-module (gnu image) + #:use-module (gnu system image) #:use-module (gnu system linux-container) #:use-module (gnu system linux-initrd) #:use-module (gnu bootloader) @@ -60,7 +62,7 @@ #:use-module (gnu services base) #:use-module (gnu system uuid) - #:use-module (srfi srfi-1) + #:use-module ((srfi srfi-1) #:hide (partition)) #:use-module (srfi srfi-26) #:use-module (rnrs bytevectors) #:use-module (ice-9 match) @@ -592,7 +594,8 @@ the operating system." (check? #f) (create-mount-point? #t))))) -(define* (virtualized-operating-system os mappings #:optional (full-boot? #f)) +(define* (virtualized-operating-system os mappings + #:key (full-boot? #f) volatile?) "Return an operating system based on OS suitable for use in a virtualized environment with the store shared with the host. MAPPINGS is a list of <file-system-mapping> to realize in the virtualized OS." @@ -635,7 +638,7 @@ environment with the store shared with the host. MAPPINGS is a list of (initrd (lambda (file-systems . rest) (apply (operating-system-initrd os) file-systems - #:volatile-root? #t + #:volatile-root? volatile? rest))) ;; Disable swap. @@ -692,7 +695,8 @@ bootloader refers to: OS kernel, initrd, bootloader data, etc." #:register-closures? #f #:copy-inputs? full-boot?)) -(define* (common-qemu-options image shared-fs) +(define* (common-qemu-options image shared-fs + #:key rw-image?) "Return the a string-value gexp with the common QEMU options to boot IMAGE, with '-virtfs' options for the host file systems listed in SHARED-FS." @@ -712,8 +716,10 @@ with '-virtfs' options for the host file systems listed in SHARED-FS." "-device" "virtio-rng-pci,rng=guix-vm-rng" #$@(map virtfs-option shared-fs) - (format #f "-drive file=~a,if=virtio,cache=writeback,werror=report,readonly=on" - #$image))) + #$@(if rw-image? + #~((format #f "-drive file=~a,if=virtio" #$image)) + #~((format #f "-drive file=~a,if=virtio,cache=writeback,werror=report,readonly=on" + #$image))))) (define* (system-qemu-image/shared-store-script os #:key @@ -721,7 +727,8 @@ with '-virtfs' options for the host file systems listed in SHARED-FS." (target (%current-target-system)) (qemu qemu) (graphic? #t) - (memory-size 256) + (volatile? #t) + (memory-size 2048) (mappings '()) full-boot? (disk-image-size @@ -736,20 +743,31 @@ MAPPINGS is a list of <file-system-mapping> specifying mapping of host file systems into the guest. When FULL-BOOT? is true, the returned script runs everything starting from the -bootloader; otherwise it directly starts the operating system kernel. The -DISK-IMAGE-SIZE parameter specifies the size in bytes of the root disk image; -it is mostly useful when FULL-BOOT? is true." - (mlet* %store-monad ((os -> (virtualized-operating-system os mappings full-boot?)) - (image (system-qemu-image/shared-store - os - #:system system - #:target target +bootloader; otherwise it directly starts the operating system kernel. When +VOLATILE? is true, an overlay is created on top of a read-only +storage. Otherwise the storage is made persistent. The DISK-IMAGE-SIZE +parameter specifies the size in bytes of the root disk image; it is mostly +useful when FULL-BOOT? is true." + (mlet* %store-monad ((os -> (virtualized-operating-system + os mappings #:full-boot? full-boot? - #:disk-image-size disk-image-size))) + #:volatile? volatile?)) + (base-image -> (system-image + (image + (inherit + (raw-with-offset-disk-image)) + (operating-system os) + (size disk-image-size) + (shared-store? + (and (not full-boot?) volatile?)) + (volatile-root? volatile?))))) (define kernel-arguments #~(list #$@(if graphic? #~() #~("console=ttyS0")) #+@(operating-system-kernel-arguments os "/dev/vda1"))) + (define rw-image + #~(format #f "/tmp/.~a-rw" (basename #$base-image))) + (define qemu-exec #~(list #+(file-append qemu "/bin/" (qemu-command (or target system))) @@ -761,17 +779,25 @@ it is mostly useful when FULL-BOOT? is true." "-initrd" #$(file-append os "/initrd") (format #f "-append ~s" (string-join #$kernel-arguments " ")))) - #$@(common-qemu-options image + #$@(common-qemu-options (if volatile? base-image rw-image) (map file-system-mapping-source - (cons %store-mapping mappings))) + (cons %store-mapping mappings)) + #:rw-image? (not volatile?)) "-m " (number->string #$memory-size) #$@options)) (define builder #~(call-with-output-file #$output (lambda (port) - (format port "#!~a~% exec ~a \"$@\"~%" - #+(file-append bash "/bin/sh") + (format port "#!~a~%" + #+(file-append bash "/bin/sh")) + (when (not #$volatile?) + (format port "~a~%" + #$(program-file "copy-image" + #~(unless (file-exists? #$rw-image) + (copy-file #$base-image #$rw-image) + (chmod #$rw-image #o640))))) + (format port "exec ~a \"$@\"~%" (string-join #$qemu-exec " ")) (chmod port #o555)))) @@ -788,6 +814,8 @@ it is mostly useful when FULL-BOOT? is true." (operating-system virtual-machine-operating-system) ;<operating-system> (qemu virtual-machine-qemu ;<package> (default qemu-minimal)) + (volatile? virtual-machine-volatile? ;Boolean + (default #t)) (graphic? virtual-machine-graphic? ;Boolean (default #f)) (memory-size virtual-machine-memory-size ;integer (MiB) @@ -821,17 +849,19 @@ FORWARDINGS is a list of host-port/guest-port pairs." (define-gexp-compiler (virtual-machine-compiler (vm <virtual-machine>) system target) (match vm - (($ <virtual-machine> os qemu graphic? memory-size disk-image-size ()) + (($ <virtual-machine> os qemu volatile? graphic? memory-size + disk-image-size ()) (system-qemu-image/shared-store-script os #:system system #:target target #:qemu qemu #:graphic? graphic? + #:volatile? volatile? #:memory-size memory-size #:disk-image-size disk-image-size)) - (($ <virtual-machine> os qemu graphic? memory-size disk-image-size - forwardings) + (($ <virtual-machine> os qemu volatile? graphic? memory-size + disk-image-size forwardings) (let ((options `("-nic" ,(string-append "user,model=virtio-net-pci," @@ -841,6 +871,7 @@ FORWARDINGS is a list of host-port/guest-port pairs." #:target target #:qemu qemu #:graphic? graphic? + #:volatile? volatile? #:memory-size memory-size #:disk-image-size disk-image-size |