Hello Guix,
Recently I noticed after reconfiguring with the following
operating system definition:
--8<---------------cut here---------------start------------->8---
(use-modules (gnu bootloader)
(gnu bootloader grub)
(gnu packages linux)
(gnu system file-systems)
(guix gexp)
(sysadmin build-machines))
;;; XXX: Copied from berlin-nodes.scm.
(define %authorized-guix-keys
;; List of authorized 'guix archive' keys.
(list (local-file "keys/guix/berlin.guixsd.org-export.pub")))
(define %btrfs-raid-uuid "64a837b7-b9dc-4b64-ba95-712ba4032c71")
(define %common-btrfs-options '(("compress-force" . "zstd")
("space_cache" . "v2")
"degraded"))
;;; Top-level Btrfs subvolume.
(define %btrfs-pool
(file-system
(device (uuid %btrfs-raid-uuid))
(mount-point "/mnt/btrfs-pool")
(create-mount-point? #t)
(type "btrfs")
(options (alist->file-system-options
(cons '("subvolid" . "5")
%common-btrfs-options)))))
(define (btrfs-subvolume-mount name mount-point)
"Return a file system to mount the Btrfs subvolume NAME at MOUNT-POINT."
(file-system
(device (uuid %btrfs-raid-uuid))
(mount-point mount-point)
(create-mount-point? #t)
(type "btrfs")
(options (alist->file-system-options
(cons (cons "subvol" name)
%common-btrfs-options)))))
(define node-129-os
(let ((base-os (berlin-new-build-machine-os
129 #:authorized-guix-keys %authorized-guix-keys)))
(operating-system
(inherit base-os)
(bootloader
(bootloader-configuration
(inherit (operating-system-bootloader base-os))
(bootloader grub-bootloader)
(targets (list "/dev/sdb" "/dev/sdc" "/dev/sdd"))
(menu-entries
(list (menu-entry
(label "Previous system -- 5.15.19 (#91, 2022-02-18 22:25)")
(linux
"/gnu/store/8w9v4dka10cv0r5fyw9f0pc14fszbl03-linux-libre-5.15.19/bzImage")
(linux-arguments
'("--root=my-root"
"--system=/var/guix/profiles/system-92-link"
"--load=/var/guix/profiles/system-92-link/boot"
"console=tty0"
"console=ttyS0,57600n8"))
(initrd
"/gnu/store/in2bcjh03kyv793v8bd3fizswyx1q0rq-raw-initrd/initrd.cpio.gz"))))))
(file-systems (cons*
(btrfs-subvolume-mount "@root" "/")
(btrfs-subvolume-mount "@etc" "/etc")
(btrfs-subvolume-mount "@home" "/home")
(btrfs-subvolume-mount "@cache" "/var/cache")
(btrfs-subvolume-mount "@log" "/var/log")
(btrfs-subvolume-mount "@secrets" "/secrets")
(btrfs-subvolume-mount "@srv" "/srv")
%btrfs-pool
%base-file-systems))
(packages (cons btrfs-progs (operating-system-packages base-os)))
;; FIXME: fix swap field.
)))
node-129-os
--8<---------------cut here---------------end--------------->8---
That the custom menu-entry object specified in the bootloader
configuration would also result in a grub.cfg entry where the linux and
initrd items would be prefixed with '/@root/' (the store directory
prefix), which is not desired (this entry corresponds to another,
previous system generation that didn't even use Btrfs).
The problem is that the store-directory-prefix is globally applied to
all menu entries corresponding to a specific generation (e.g., via the
boot-parameters file); it seems like it should rather be preserved per
menu-entry.
Thanks,
Maxim
