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bug#44353: [PATCH version-1.2.0 v2 3/3] doc: Detail which bootloader get
From: |
Maxim Cournoyer |
Subject: |
bug#44353: [PATCH version-1.2.0 v2 3/3] doc: Detail which bootloader get used with disk-image or vm-image. |
Date: |
Wed, 11 Nov 2020 22:57:13 -0500 |
* doc/guix.texi (Invoking guix system): Extend doc.
---
doc/guix.texi | 31 ++++++++++++++++++++++++++-----
1 file changed, 26 insertions(+), 5 deletions(-)
diff --git a/doc/guix.texi b/doc/guix.texi
index b7f1bc1f00..e15ee4092c 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -30909,11 +30909,25 @@ 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
+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 +rw /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
@@ -30927,10 +30941,17 @@ 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
--
2.28.0
- bug#44353: guix system disk-image -t raw fails with grub-efi-bootloader, Maxim Cournoyer, 2020/11/07
- bug#44353: [PATCH version-1.2.0 v2 1/3] image: Remove conflicting user-provided EFI file system., Mathieu Othacehe, 2020/11/12
- bug#44353: [PATCH version-1.2.0 v2 1/3] image: Remove conflicting user-provided EFI file system., Maxim Cournoyer, 2020/11/17
- bug#44353: [PATCH version-1.2.0 v2] guix: system: Add a new '--non-volatile' option for disk-image., Maxim Cournoyer, 2020/11/12
- bug#44353: [PATCH version-1.2.0 v2] guix: system: Add a new '--non-volatile' option for disk-image., Mathieu Othacehe, 2020/11/12
- bug#44353: [PATCH version-1.2.0 v2] guix: system: Add a new '--non-volatile' option for disk-image., Maxim Cournoyer, 2020/11/12