From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#33517: Problem booting when using btrfs subvolume for /gnu/store
Date: Wed, 28 Nov 2018 14:21:47 +0100
Message-ID: <87zhtt49sk.fsf@gnu.org>
References: <87mupva8j5.fsf@cbaines.net>
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In-Reply-To: <87mupva8j5.fsf@cbaines.net> (Christopher Baines's message of
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To: Christopher Baines <mail@cbaines.net>
Cc: 33517@debbugs.gnu.org

Hello,

Christopher Baines <mail@cbaines.net> skribis:

> I'm loosing track of this issue a bit, as I've been dealing with it for
> a while. I have a machine that I've setup where /gnu/store is a btrfs
> subvolume. I do this so that I can make flexible use of the space on
> that btrfs filesystem.
>
> Unfortunately, the grub configuration generated for this doesn't seem to
> account for this, and so it requires some tweaking to get it to boot.
>
> A long while back, I discovered I could make the following change, then
> the generated grub configuration would be fine.
>
>
> ---
>  gnu/bootloader/grub.scm | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/gnu/bootloader/grub.scm b/gnu/bootloader/grub.scm
> index 06856dd58c..c3ddc3e128 100644
> --- a/gnu/bootloader/grub.scm
> +++ b/gnu/bootloader/grub.scm
> @@ -320,8 +320,8 @@ entries corresponding to old generations of the syste=
m."
>        ;; Use the right file names for KERNEL and INITRD in case
>        ;; DEVICE-MOUNT-POINT is not "/", meaning that the store is on a
>        ;; separate partition.
> -      (let ((kernel  (strip-mount-point device-mount-point kernel))
> -            (initrd  (strip-mount-point device-mount-point initrd)))
> +      (let ((kernel kernel)
> +            (initrd initrd))
>          #~(format port "menuentry ~s {
>    ~a
>    linux ~a ~a
> --
> 2.19.2
>
>
>
> Unfortunately, it's not a proper solution, as it obviously breaks when
> you actually want to strip the mount point off so that grub can find the
> right files.

Is there a way =E2=80=98strip-mount-point=E2=80=99 or some higher-level cod=
e could
determine whether we actually need to strip the mount point?

Thanks,
Ludo=E2=80=99.