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reconfigure: Support loading the system for kexec reboot.

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This allows rebooting straight into the new system with ‘reboot -k’.

* guix/scripts/system/reconfigure.scm (kexec-loading-program)
(load-system-for-kexec): New procedures.
* gnu/tests/reconfigure.scm (run-kexec-test): New procedure.
(%test-upgrade-kexec): New variable.
* guix/scripts/system.scm (perform-action): Add #:load-for-kexec?.
Call ‘load-system-for-kexec’.
(show-help, %options): Add ‘--no-kexec’.
(%default-options): Add ‘load-for-kexec?’.
(process-action): Honor it and pass it to ‘perform-action’.
* gnu/machine/ssh.scm (deploy-managed-host): Add call to
‘load-system-for-kexec’.
* doc/guix.texi (Invoking guix system): Document it.

Change-Id: I86d11f1c348e4359bc9e73c86e5aebff60fe875c
This commit is contained in:
Ludovic Courtès
2024-12-19 16:24:49 +01:00
parent ebe706a1e8
commit 1305f78d05
5 changed files with 143 additions and 3 deletions
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11
doc/guix.texi
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@@ -43599,11 +43599,20 @@ list-generations}). If that generation already exists, it will be
overwritten. This behavior mirrors that of @command{guix package}
(@pxref{Invoking guix package}).
It also adds a bootloader menu entry for the new OS configuration,
It adds a bootloader menu entry for the new OS configuration,
---unless @option{--no-bootloader} is passed. For GRUB, it moves
entries for older configurations to a submenu, allowing you to choose
an older system generation at boot time should you need it.
@cindex kexec, for fast reboots
@cindex rebooting @i{via} Linux kexec
On Linux, @command{guix system reconfigure} also loads the new system
for fast reboot @i{via} kexec: running @command{reboot --kexec} will
boot the new system by directly executing its kernel, thus bypassing the
BIOS initialization phase and bootloader (@pxref{Invoking reboot,,,
shepherd, The GNU Shepherd Manual}). You can avoid this behavior by
passing the @option{--no-kexec} option.
@cindex provenance tracking, of the operating system
Upon completion, the new system is deployed under
@file{/run/current-system}. This directory contains @dfn{provenance