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Re: grub with encrpted root no longer automatically loads luks

From: Mark H Weaver
Subject: Re: grub with encrpted root no longer automatically loads luks
Date: Fri, 28 Jun 2019 23:21:54 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)

Hi Jack,

Jack Hill <address@hidden> writes:

> I've noticed that recently (unfortunately, I don't know exactly when
> it started), that grub no longer prompts me to enter my password to
> unlock my root filesystem.

FWIW, I also use an encrypted root filesystem on my Guix system, and
I've updated Guix since you reported the problem, and it works for me.
GRUB continues to prompt me for the LUKS passphase at boot.

One notable difference between our system configurations is that you
have a separate /boot filesystem, and I don't.  All I have is a single
encrypted root filesystem, plus %base-file-systems.  I wonder if this
might be the relevant difference?


> I notice that at the grub command line, if
> I enter `cryptomount -a`, I am not prompted for a password, and the
> root filesystem does not become available. However, if I first run
> `insmod luks` and then `cryptomount -a`, I am prompted for my
> password, and the root filesystem become available and I can boot
> normally.
> Therefore, it seem like grub is not auto-loading the luks module for
> some reason. Why might this be the case? What needs to be changed so
> that luks is auto loaded?
> Best,
> Jack
> my config.scm:
> ;; This is an operating system configuration template
> ;; for a "desktop" setup with GNOME and Xfce where the
> ;; root partition is encrypted with LUKS.
> (use-modules (gnu) (gnu system nss) (gnu services xorg)
>            (gnu packages linux))
> (use-service-modules desktop)
> (use-package-modules certs gnome scanner security-token)
> (operating-system
>  (host-name "alperton")
>  (timezone "America/New_York")
>  (locale "en_US.utf8")
>  (bootloader (bootloader-configuration
>             (bootloader grub-bootloader)
>             (target "/dev/sda")))
>  ;; Specify a mapped device for the encrypted root partition.
>  ;; The UUID is that returned by 'cryptsetup luksUUID'.
>  (mapped-devices
>   (list (mapped-device
>        (source (uuid "f7776767-70c9-44e3-9973-c1334d301348"))
>        (target "alperton_root")
>        (type luks-device-mapping))))
>  (file-systems (cons*
>               (file-system
>                (device (file-system-label "boot"))
>                (mount-point "/boot")
>                (type "ext4"))
>               (file-system
>                (device (file-system-label "alperton_root"))
>                (mount-point "/")
>                (type "ext4")
>                (dependencies mapped-devices))
>               %base-file-systems))
>  (swap-devices (list "/root/swap"))
>  (users (cons (user-account
>              (name "jackhill")
>              (comment "Jack Hill")
>              (group "users")
>              (supplementary-groups '("wheel" "netdev"
>                                      "audio" "lp" "video"))
>              (home-directory "/home/jackhill"))
>             %base-user-accounts))
>  ;; This is where we specify system-wide packages.
>  (packages (cons* nss-certs         ;for HTTPS access
>                 fuse-exfat
>                 gvfs              ;for user mounts
>                 %base-packages))
>  ;; Add GNOME and/or Xfce---we can choose at the log-in
>  ;; screen with F1.  Use the "desktop" services, which
>  ;; include the X11 log-in service, networking with
>  ;; NetworkManager, and more.
>  (services (cons* (service gnome-desktop-service-type)
>                 (bluetooth-service)
>                 (simple-service 'custom-udev-rules udev-service-type (list 
> sane-backends libu2f-host))
>                 %desktop-services))
>  ;; Allow resolution of '.local' host names with mDNS.
>  (name-service-switch %mdns-host-lookup-nss))

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