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doc: Detail which bootloader get used with disk-image or vm-image. 

* doc/guix.texi (Invoking guix system): Extend doc.
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Maxim Cournoyer 2020-11-11 22:43:14 -05:00
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@ -31027,11 +31027,25 @@ a value. Docker images are built to contain exactly what they need, so
the @option{--image-size} option is ignored in the case of
@code{docker-image}.
@cindex disk-image, creating disk images
The @code{disk-image} command can produce various image types. The
image type can be selected using the @command{--image-type} option. It
defaults to @code{raw}. When its value is @code{iso9660}, the
@option{--label} option can be used to specify a volume ID with
@code{disk-image}.
@code{disk-image}. When using @code{disk-image}, the bootloader
installed on the generated image is taken from the provided
@code{operating-system} definition. The following example demonstrates
how to generate an image that uses the @code{grub-efi-bootloader}
bootloader and boot it with QEMU:
@example
image=$(guix system disk-image --image-type=qcow2 \
gnu/system/examples/lightweight-desktop.tmpl)
cp $image /tmp/my-image.qcow2
chmod +w /tmp/my-image.qcow2
qemu-system-x86_64 -enable-kvm -hda /tmp/my-image.qcow2 -m 1000
-bios $(guix build ovmf)/share/firmware/ovmf_x64.bin
@end example
When using the @code{raw} image type, a raw disk image is produced; it
can be copied as is to a USB stick, for instance. Assuming
@ -31045,10 +31059,17 @@ the image to it using the following command:
The @code{--list-image-types} command lists all the available image
types.
@cindex vm-image, creating virtual machine images
When using @code{vm-image}, the returned image is in qcow2 format, which
the QEMU emulator can efficiently use. @xref{Running Guix in a VM},
for more information on how to run the image in a virtual machine.
the QEMU emulator can efficiently use. @xref{Running Guix in a VM}, for
more information on how to run the image in a virtual machine. The
@code{grub-bootloader} bootloader is always used independently of what
is declared in the @code{operating-system} file passed as argument.
This is to make it easier to work with QEMU, which uses the SeaBIOS BIOS
by default, expecting a bootloader to be installed in the Master Boot
Record (MBR).
@cindex docker-image, creating docker images
When using @code{docker-image}, a Docker image is produced. Guix builds
the image from scratch, not from a pre-existing Docker base image. As a
result, it contains @emph{exactly} what you define in the operating