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authorLudovic Courtès <ludo@gnu.org>2014-11-21 00:02:26 +0100
committerLudovic Courtès <ludo@gnu.org>2014-11-21 00:02:26 +0100
commit0276f697b3dbab417dcad7ff32dfb4b9fb330ec4 (patch)
tree8902cdb6da9e43887d5db92ef6424b16bb05b7f0 /doc
parentfcf63cf880cf260601f4bda763e80e5ddd527d62 (diff)
downloadguix-0276f697b3dbab417dcad7ff32dfb4b9fb330ec4.tar.gz
guix-0276f697b3dbab417dcad7ff32dfb4b9fb330ec4.zip
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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diff --git a/doc/guix.texi b/doc/guix.texi
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--- a/doc/guix.texi
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@@ -4375,12 +4375,27 @@ This command also installs GRUB on the device specified in
@item vm
@cindex virtual machine
+@cindex VM
Build a virtual machine that contain the operating system declared in
@var{file}, and return a script to run that virtual machine (VM).
Arguments given to the script are passed as is to QEMU.
The VM shares its store with the host system.
+Additional file systems can be shared between the host and the VM using
+the @code{--share} and @code{--expose} command-line options: the former
+specifies a directory to be shared with write access, while the latter
+provides read-only access to the shared directory.
+
+The example below creates a VM in which the user's home directory is
+accessible read-only, and where the @file{/exchange} directory is a
+read-write mapping of the host's @file{$HOME/tmp}:
+
+@example
+guix system vm my-config.scm \
+ --expose=$HOME --share=$HOME/tmp=/exchange
+@end example
+
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.