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Recovering from a bad installation

From: Ricardo Wurmus
Subject: Recovering from a bad installation
Date: Sat, 05 Aug 2017 10:48:06 +0200
User-agent: mu4e 0.9.18; emacs 25.2.1

Hi Guix,

If you forgot to set the file system label for the root file system to the
label you specified in the operating system configuration file then you won't
be able to boot.  Instead you'll end up in a recovery Guile REPL.

Here's what I did when I found myself in this very situation:

--8<---------------cut here---------------start------------->8---
,use (ice-9 ftw)
,use (srfi srfi-1)
,use (gnu build file-systems)

;; Mount the root file system by device handle
(mount-file-system '("/dev/sda1" any "/" "ext4" () #f #f) #:root "/")

;; Oops!  We lost /dev!  Let's find the "mount" tool.
(filter (lambda (f) (string-contains f "util-linux")) (scandir "/gnu/store"))

;; … pick out the directory that looks right

;; Mount /dev
"/gnu/store/6z06w9zfnq3zcr50vcv2wvzr5wpzvy7l-util-linux-2.29.2/bin/mount" "-t" 
"devtmpfs" "none" "/dev")

;; Find e2label
(filter (lambda (f) (string-contains f "e2fsprogs")) (scandir "/gnu/store"))

;; … pick out the directory that looks right

;; Use it to change the label on /dev/sda1
"/dev/sda1" "my-root")

;; reboot!
--8<---------------cut here---------------end--------------->8---


GPG: BCA6 89B6 3655 3801 C3C6  2150 197A 5888 235F ACAC

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