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installation on LVM on LUKS

From: Emmanuel Beffara
Subject: installation on LVM on LUKS
Date: Thu, 2 Mar 2023 11:25:53 +0100


I am currently trying to install Guix System on my laptop and I am facing an
issue with the bootloader configuration.

I use full-disk encryption with a single encrypted partition, split into
several logical volumes using LVM, plus an extra non-encrypted partition for
EFI boot material:

        nvme0n1              259:0    0 953,9G  0 disk
        ├─nvme0n1p1          259:1    0 953,4G  0 part
        │ └─manivelle        254:0    0 953,4G  0 crypt
        │   ├─storage-swap   254:1    0    32G  0 lvm   [SWAP]
        │   │ [...]
        │   └─storage-guix   254:5    0    64G  0 lvm   /
        └─nvme0n1p2          259:2    0   487M  0 part  /boot

I attach the system configuration, which I derived from the desktop template.

Everything installed fine EXCEPT that Grub fails to load its LVM volume, hence
the root partition is not found. Indeed, the produced grub.cfg has no mention
of lvm anywhere. If I adjust it by inserting "insmod lvm" somewhere, either at
the start or in a menuentry, or if I do that by hand in the Grub shell, then
the system starts and works fine.

Did I miss something in the configuration ?

As a related point, this setup requires entering the decryption password
twice: once so that Grub can load the kernel from the store, and once so that
the kernel can open the volume itself. I understand the situation is known,
but it could be avoided, for instance, by copying the kernel and initrd
somewhere in the EFI partition so that they could be loaded directly. Besides,
for some reason, Grub is extremely slow at opening the partition: it takes
around 30 seconds to start after I correctly enter the password, whereas the
kernel boots in just a few seconds after I enter the password for it.

Any thoughts on this ?


Attachment: config.scm
Description: Text document

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