[bug#52204] [PATCH 2/2] doc: Document guix system --no-graphic.

[Attila Lendvai <attila@lendvai.name>]

* doc/guix.texi (Invoking guix system): Add example to combine guix system and
invoking the vm start script into one command.  Split the description of the
various options into separate paragraphs.  Adde a paragraph to describe
--no-graphic.
---
 doc/guix.texi | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index 2a166e3a89..ca670f8971 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -34500,8 +34500,8 @@ passed.
 @cindex virtual machine
 @cindex VM
 @anchor{guix system vm}
-Build a virtual machine that contains the operating system declared in
-@var{file}, and return a script to run that virtual machine (VM).
+Build a virtual machine (VM) that contains the operating system declared
+in @var{file}, and return a script to run that VM.
 
 @quotation Note
 The @code{vm} action and others below
@@ -34520,6 +34520,12 @@ emulated machine:
 $ /gnu/store/@dots{}-run-vm.sh -m 1024 -smp 2 -nic user,model=virtio-net-pci
 @end example
 
+It's possible to combine the two steps into one:
+
+@example
+$ $(guix system vm my-config.scm) -m 1024
+@end example
+
 The VM shares its store with the host system.
 
 Additional file systems can be shared between the host and the VM using
@@ -34543,8 +34549,17 @@ store of the host can then be mounted.
 The @option{--full-boot} option forces a complete boot sequence, starting
 with the bootloader.  This requires more disk space since a root image
 containing at least the kernel, initrd, and bootloader data files must
-be created.  The @option{--image-size} option can be used to specify the
-size of the image.
+be created.
+
+The @option{--image-size} option can be used to specify the size of the
+image.
+
+The @option{--no-graphic} option will instruct @command{guix system} to
+spawn a headless VM that will use the invoking tty for IO.  Among other
+things, this enables copy-pasting, and scrollback.  Use the @kbd{ctrl-a}
+prefix to issue QEMU commands; e.g. @kbd{ctrl-a h} prints a help,
+@kbd{ctrl-a x} quits the VM, and @kbd{ctrl-a c} switches between the
+QEMU monitor and the VM.
 
 @cindex System images, creation in various formats
 @cindex Creating system images in various formats
-- 
2.33.0