guix system: Add '--share' and '--expose' options for 'vm'.
* guix/scripts/system.scm (system-derivation-for-action): Add #:mappings parameter. Pass it to 'system-qemu-image/shared-store-script'. (perform-action): Likewise. (show-help): Document --share and --expose. (specification->file-system-mapping): New procedure. (%options): Add --share and --expose. (guix-system): Pass #:mapping to 'perform-action'. * doc/guix.texi (Invoking guix system): Document it.
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Ludovic Courtès
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@ -4375,12 +4375,27 @@ This command also installs GRUB on the device specified in
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@item vm
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@cindex virtual machine
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@cindex VM
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Build a virtual machine that contain the operating system declared in
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@var{file}, and return a script to run that virtual machine (VM).
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Arguments given to the script are passed as is to QEMU.
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The VM shares its store with the host system.
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Additional file systems can be shared between the host and the VM using
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the @code{--share} and @code{--expose} command-line options: the former
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specifies a directory to be shared with write access, while the latter
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provides read-only access to the shared directory.
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The example below creates a VM in which the user's home directory is
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accessible read-only, and where the @file{/exchange} directory is a
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read-write mapping of the host's @file{$HOME/tmp}:
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@example
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guix system vm my-config.scm \
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--expose=$HOME --share=$HOME/tmp=/exchange
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@end example
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On GNU/Linux, the default is to boot directly to the kernel; this has
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the advantage of requiring only a very tiny root disk image since the
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host's store can then be mounted.
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@ -264,7 +264,7 @@ it atomically, and then run OS's activation script."
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;;;
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(define* (system-derivation-for-action os action
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#:key image-size full-boot?)
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#:key image-size full-boot? mappings)
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"Return as a monadic value the derivation for OS according to ACTION."
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(case action
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((build init reconfigure)
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@ -274,7 +274,8 @@ it atomically, and then run OS's activation script."
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((vm)
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(system-qemu-image/shared-store-script os
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#:full-boot? full-boot?
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#:disk-image-size image-size))
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#:disk-image-size image-size
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#:mappings mappings))
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((disk-image)
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(system-disk-image os #:disk-image-size image-size))))
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@ -298,7 +299,8 @@ true."
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(define* (perform-action action os
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#:key grub? dry-run?
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use-substitutes? device target
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image-size full-boot?)
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image-size full-boot?
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(mappings '()))
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"Perform ACTION for OS. GRUB? specifies whether to install GRUB; DEVICE is
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the target devices for GRUB; TARGET is the target root directory; IMAGE-SIZE
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is the size of the image to be built, for the 'vm-image' and 'disk-image'
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@ -307,7 +309,8 @@ boot directly to the kernel or to the bootloader."
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(mlet* %store-monad
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((sys (system-derivation-for-action os action
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#:image-size image-size
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#:full-boot? full-boot?))
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#:full-boot? full-boot?
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#:mappings mappings))
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(grub (package->derivation grub))
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(grub.cfg (grub.cfg os))
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(drvs -> (if (and grub? (memq action '(init reconfigure)))
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@ -379,6 +382,10 @@ Build the operating system declared in FILE according to ACTION.\n"))
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--image-size=SIZE for 'vm-image', produce an image of SIZE"))
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(display (_ "
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--no-grub for 'init', do not install GRUB"))
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(display (_ "
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--share=SPEC for 'vm', share host file system according to SPEC"))
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(display (_ "
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--expose=SPEC for 'vm', expose host file system according to SPEC"))
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(display (_ "
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--full-boot for 'vm', make a full boot sequence"))
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(newline)
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@ -389,6 +396,19 @@ Build the operating system declared in FILE according to ACTION.\n"))
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(newline)
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(show-bug-report-information))
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(define (specification->file-system-mapping spec writable?)
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"Read the SPEC and return the corresponding <file-system-mapping>."
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(let ((index (string-index spec #\=)))
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(if index
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(file-system-mapping
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(source (substring spec 0 index))
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(target (substring spec (+ 1 index)))
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(writable? writable?))
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(file-system-mapping
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(source spec)
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(target spec)
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(writable? writable?)))))
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(define %options
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;; Specifications of the command-line options.
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(cons* (option '(#\h "help") #f #f
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@ -408,6 +428,18 @@ Build the operating system declared in FILE according to ACTION.\n"))
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(option '("full-boot") #f #f
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(lambda (opt name arg result)
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(alist-cons 'full-boot? #t result)))
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(option '("share") #t #f
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(lambda (opt name arg result)
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(alist-cons 'file-system-mapping
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(specification->file-system-mapping arg #t)
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result)))
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(option '("expose") #t #f
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(lambda (opt name arg result)
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(alist-cons 'file-system-mapping
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(specification->file-system-mapping arg #f)
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result)))
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(option '(#\n "dry-run") #f #f
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(lambda (opt name arg result)
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(alist-cons 'dry-run? #t result)))
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@ -502,6 +534,11 @@ Build the operating system declared in FILE according to ACTION.\n"))
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#:use-substitutes? (assoc-ref opts 'substitutes?)
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#:image-size (assoc-ref opts 'image-size)
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#:full-boot? (assoc-ref opts 'full-boot?)
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#:mappings (filter-map (match-lambda
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(('file-system-mapping . m)
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m)
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(_ #f))
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opts)
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#:grub? grub?
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#:target target #:device device)
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#:system system))))
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