whitslack

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whitslack

Early Userspace without Initramfs

If you've built your own kernel with all necessary storage-controller and file-system drivers built in, then you may have no need of an early userspace environment. However, if you want to do anything non-trivial with your root file system (LVM, LUKS, etc.), then you need an early userspace to set up and mount it. The traditional mechanism for this is initramfs, but building and maintaining an initramfs image is awkward and tiresome. Initramfs is a sledgehammer when, nine times out of ten, all you need is a screwdriver. This guide details a method of booting into an early userspace environment located in an ordinary file system on a physical disk partition, where an init script in this environment in turn sets up and mounts the real root file system and pivots into it.

Setting Up the Basic Environment

In order to employ this method of booting your system, you will need a traditional (non-LVM) disk partition containing a file system that your kernel can mount without

whitslack

# Accumulates flags in the associative array named by ${1}.
accumulate() {
	declare -Ag ${1?}
	local -n var=${1} ; shift
	local flag ; for flag in "${@}" ; do
		case ${flag} in
			'-*') var=( ['*']=0 ) ;;
			-*) var[${flag:1}]=0 ;;
			*) var[${flag}]=1 ;;
		esac

whitslack

BIP: whitlock-txid-draft
Layer: Consensus (hard fork)
Title: Mitigating transaction malleability by redefining TxId
Author: Matt Whitlock <[email protected]>
Type: Standards Track
Created: 2017-04-01
License: WTFPL <http://www.wtfpl.net/>

whitslack

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>

#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <sysexits.h>
#include <unistd.h>

whitslack

#!/bin/sh
# Discussion at https://community.frame.work/t/fw16-debian-bookworm-hibernate-not-reliable/52980/11?u=whitslack

mount --no-mtab -t devtmpfs dev /dev
mount --no-mtab -t proc proc /proc
mount --no-mtab -t sysfs sysfs /sys

loadkeys dvorak
echo 51 >/sys/class/backlight/amdgpu_bl0/brightness