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bug#32313: Failed to boot after reconfiguring with a btrfs drive.
From: |
Danny Milosavljevic |
Subject: |
bug#32313: Failed to boot after reconfiguring with a btrfs drive. |
Date: |
Tue, 31 Jul 2018 22:40:05 +0200 |
Hi,
On Tue, 31 Jul 2018 12:04:54 +1000
Brendan Tildesley <address@hidden> wrote:
> On 07/31/18 02:55, Danny Milosavljevic wrote:
> > Hi,
> >
> > hmm, where's the "file-systems" form in your system config?
> >
> > The first important part is whether your file-system entry is
> > needed-for-boot? or not.
> >
> Sorry, I forgot to un-kill it before copying the whole definition. It's here
>
> (file-systems
> (cons*
> (file-system
> (device (file-system-label "1tb"))
> (mount-point "/mnt/1tb/")
> (type "btrfs"))
> (file-system
> ;;(device
> "/dev/disk/by-id/ata-Samsung_SSD_850_EVO_1TB_S2PWNX0J204086P-part1")
> (device (file-system-label "1ssd"))
> (mount-point "/")
> (type "ext4"))
> %base-file-systems))
So it defaults to needed-for-boot? #f.
I think this is a real bug.
There is code in Guix to create an initrd. It will also create a correct
modules.devname and also create a linux-boot module which will run on
system boot and set up some files in /dev (reading from modules.devname),
among those btrfs-control, IF THERE'S A btrfs FILESYSTEM WITH
needed-for-boot? #t .
Here there isn't. So the initrd won't create /dev/btrfs-control .
But when needed-for-boot? is #f that means the file system will be mounted
somewhen later (not in the initrd) when the root fs and store is already there.
That means there should be a shepherd service or activation part that
parses linux-libre*/modules.devname and creates the still-missing /dev entries.
Where is that part? It should be either a dependency of the part that mounts
the filesystem or just be right before it. So we need a backtrace...
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