User:Zucca/initramfs/init scripts

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Warning
All scripts on this page have not gone trough proper testing. Modification may be required to make them useful on each system.

Fancy ansi logo, rescue shell and hibernaation support

Warning
This init script does have known bugs. Although not serious, it may still contain unknown bugs. Users are highly encouraged to check and modify the script for their specific needs.
FILE init
#!/bin/busybox sh

hdroot='/hdroot'
banner='/images/gentoo_h.ans'
msgque=""

# Source:
# https://github.com/dylanaraps/pure-sh-bible/tree/cd6e426a50eb07497b9c5bf763aec53744410568#check-if-a-number-is-an-integer
is_int() {
    # usage: is_int "number"
    printf %d "$1" >/dev/null 2>&1
}

printc() {
	#TODO: Light/bold colors too?
	if is_int "$1" && [ "${1:0:1}" != "-" ] && [ $1 -lt 255 ]
	then
		local colorcode="$1"
		shift
		printf '\033[38;5;%sm%s\033[m' "$colorcode" "$*"
	else
		#printc 1 "Wrong color code: $1"
		printf '%s' "$*"
	fi
}

settermenv() {
	local ttysize="$(stty size)"
	export xsize="${ttysize#* }"
	export ysize="${ttysize% *}"

	if [ -f "$banner" ]
	then
		export logoheight="$(wc -l < "$banner")"
	else
		export logoheight=$((xsize/2))
	fi
	export msgstartline='5'
	export msglines=$((ysize-logoheight-msgstartline-2))
}

setenv() {
	settermenv
	export PATH="/bin:/sbin:/usr/bin:/usr/sbin"
	export TERM="linux"
	#export MANPAGER="manpager"
	#export PAGER="less"
}


lineclear() {
	# Move cursor to the beginning of the line.
	printf '\33[%d;%dH' "$1" 0
	# Crudely print spaces
	printf "%0${xsize}s"
	#resetcursor
}

nprint() {
	local l line color symbol
	case "$1" in
		W)
			color="5"
			symbol="W"
		;;
		E)
			color="9"
			symbol="!"
		;;
		*)
			color="2"
			symbol="*"
		;;
	esac
	shift
	
	msgque="${msgque}
		$(printf '%s' "$*")"
	local linecount="$(echo -n "$msgque" | wc -l)"

	if [ $linecount -lt $msglines ]
	then
		printxy "4" "$((linecount+msgstartline))" "$(printc "$color" " $symbol ")$*"
	else
		msgque="$(echo "$msgque" | tail -n $msglines)"

		ypos="$msgstartline"
		echo "$msgque" | while read line
		do
			if [ "$line" ]
			then
				lineclear "$ypos"
				printxy "4" "$ypos" "$(printc "$color" " $symbol ")${line}"
				true "$((ypos++))" # Meh. ((ypos++)) does not work.
			fi
		done
		
		for l in $(seq 1 $((msgstartline-1)))
		do
			lineclear "$l"
		done

	fi
	resetcursor
}

msg() {
	nprint OK "$*"
}

warn() {
	nprint W "$*"
}

err() {
	nprint E "$*"
}

disablemount() {
	mount() {
		warn "Disabled mount command: $*"
		return 1
	}
}

pause() {
	# By default we have no pauses.
	return 0
}

resetcursor() {
	printf '\33[%d;%dH' "$ysize" "1"
}

printxy() {
	if is_int "$1" && is_int "$2"
	then
		local xc="$1"
		local yc="$2"
		shift; shift
		printf "\33[%d;%dH%s\33[62;1H" "$yc" "$xc" "$*"
	else
		shift;shift
		printf '%s\n' "$*"
	fi
}

tryresume() {
	msg "Checking if we are waking up from hibernation..."
	if [ -n "$resumedev" ]; then
		# Print the major:minor of the resume device into /sys/power/resume
		if ! echo "$rminmaj" > /sys/power/resume
		then
		  	err "Resuming from hibernation failed."
			disablemount
			warn "By echoing minor:major of ${resumedev} (${rminmaj}) to /sys/power/resume resuming should have started..."
			esh "You may investigate what's wrong."
		fi
		msg "No hibernation image was present. Continuing booting..."
	else
		warn "No hibernation resume device was specified. Ignore this if intended. Continuing booting..."
	fi
}

esh() {
	[ "$1" ] && err "$*"
	msg "Starting emergency shell."
	if ! [ -d /e ] 
	then
		mkdir /e
		if [ "$edev" && "$efstype" ] && mount "$edev" -t "$efstype" -o "${efsflags:+${efsflags},}"ro /e 2> /dev/null
		then
			msg "Emergency partition mounted."

			if [ -f /e/emergency.cpio.gz ]
			then
				msg "Extracting emergency user-space tools..."
				zcat /e/emergency.cpio.gz | cpio -vi 2>&1 | while read k
				do
					true "$((i++))"
					printxy 40 2 "Files: $(printc 82 "$i")"
					#msg "$k"
				done
				printxy 41 3 "$(printc 82 "Done. ")"
				resetcursor
			else
				err "/e/emergency.cpio.gz does not exist."
				warn "Only busybox internals are available."
			fi
		fi
	fi

	if which bash > /dev/null 2>&1
	then
		msg "Starting bash..."
		setsid cttyhack /bin/bash
		umount /e 2> /dev/null
	else
		installenv
		msg "Starting busybox shell..."
		setsid cttyhack sh
	fi
	gentoofetch # Clears the screen after exiting the emergency shell.
}

cpumodel() {
	awk '/^model name[[:space:]]*:/ {sub(/^.*: /,""); print; exit}' /proc/cpuinfo
}
totmem() {
	awk '/^MemTotal:/ {print $2/1024 "MiB"}' /proc/meminfo 
}

gentoofetch() {
	msgque=""
	clear
	resetcursor
	local yoffset="$((ysize-logoheight))"
	cat "${1:-"$banner"}"
	#printxy 2 $((yoffset+32)) "$(printc 13 ".:Gentoo:.")"
	printxy 150 $((yoffset+21)) "$(printc 13 "The choice edition.")"
	printxy 25 $((yoffset+20)) "$(printc 82 "CPU: $(cpumodel)")"
	printxy 22 $((yoffset+22)) "$(printc 82 "RAM: $(totmem)")"
	printxy 30 $((yoffset+2)) "$(printc 82 "Kernel: $(uname -sr)")"
	resetcursor
}

parsecmdline() {
	for arg in  $(cat /proc/cmdline)
	do
		value="${arg#*=}"
		arg="${arg%%=*}"

		case "${arg}" in
			init)
				init="$value"
			;;
			root)
				if rootdev=$(findfs "$value")
				then
					msg "Root device node: ${rootdev}"
				else
					unset rootdev
					err "Unable to find root device. is 'root=${value}' correct?"
				fi
			;;
			rootfstype)
				rootfstype="$value"
				msg "Root filesystem type: $rootfstype"
			;;
			rootfsflags)
				rootfslags="$value"
			;;
			edev)
				if edev=$(findfs "$value")
				then
					msg "Emergency device node: $edev"
				else
					unset edev
					warn "Unable toi find emergency device. Check your settings."
				fi
			;;
			efstype)
				efstype="$value"
				msg "Emergency filesystem type: $efstype"
			;;
			efsflags)
				efsflags="$value"
			;;
			resume)
				if resumedev=$(findfs "$value")
				then
					msg "Hibernation resume device: $resumedev"
					export rminmaj="$(printf '%u:%u\n' $(stat -L -c '0x%t 0x%T' "$resumedev"))"
					msg "min:maj - ${rminmaj}"
				else
					err "Unable to find hibernation resume device! Will NOT automatically mount ANY devices to avoid data loss"
					disablemount
				fi
			;;
			pause)
				msg "Will pause at several points during initramfs phase."
				pause() {
					[ "$1" ] && msg "$(printc 2 "PAUSE:") $*"
					msg "Press enter to continue..."
					read
				}
				pause=true
			;;
			*)
				msg "Found '$arg'. Moving on..."
			;;
		esac
	done
}

installenv() {
	setenv
	mkdir -p /bin /sbin /usr/bin /usr/sbin 2> /dev/null
	/bin/busybox --install
}

case "${0##*/}" in
	sh|*su)
		clear
		if [ $1 ]
		then
			export banner="$1"
			settermenv
			gentoofetch
		fi
		msg "We're being sourced."
		msg "We'll only give the functions to play with."
	;;
	*)
		# Populate
		for dir in /proc /sys /dev
		do
			[ ! -d "$dir" ] && mkdir "$dir"
		done

		mount -t proc none /proc
		mount -t sysfs none /sys
		mount -t devtmpfs none /dev

		settermenv
		gentoofetch
		parsecmdline

		# Resume from hibernation if possible.
		pause "Resuming from hibernate if possible."
		tryresume

		# Create the directory for real root.
		if ! errmsg=$(mkdir "$hdroot" 2>&1)
		then
			until [ -d "$hdroot" ]
			do
				err "$errmsg"
				msg "Create directory '${hdroot}' manually."
				esh
			done
		fi
		
		if [ "$pause" ]
		then
			msg "Pausing before mounting root. Dropping to a shell."
			esh
		fi

		if [ ! -z "$rootdev" ]
		then
			if ! errmsg=$(mount -o "$rootfsflags",ro "$rootdev" "$hdroot" 2>&1)
			then
				warn "Failed to mount root filesystem into '${hdroot}'."
				warn "$errmsg"
				msg "You have to mount it manually."
				esh
				until mountpoint "${hdroot}"
				do
					esh "'${hdroot}' is not a mountpoint."
				done
			fi

			if [ -f "hdroot/${init#/}" ]
			then
				umount /dev
				umount /sys
				umount /proc
				msg "Say goodbye to initramfs. Switching to real root."
				pause "Last pause."
				exec switch_root "$hdroot" "$init"
			else
				warn "Didn't find ${init} under '${hdroot}'."
				msg "You may try to work your way to booting the system manually."
				esh
				while :
				do
					esh "You're still inside initramfs."
				done
			fi
		else
			err "Didn't found 'root=' on kernel command line."
			msg "You need to mount root and switch init."
			while :
			do
				esh "You are on your own."
			done
		fi
		err "init is about to be killed. This is bad!"
	;;
esac

msg "EOF"
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Uncompress with base32 -d gentoo_h.ans | zstd -d

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