2020-04-12 01:01:02 +05:30
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#!/bin/sh -ef
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2020-01-30 20:10:13 +05:30
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#
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2020-04-12 01:01:02 +05:30
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# tiny init
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2020-04-15 22:20:45 +05:30
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#
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# word splitting is safe by design
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# shellcheck disable=2068,2046,2086
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#
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# false positive
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# shellcheck disable=2154,2163,1091
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2020-01-05 23:31:39 +05:30
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2020-04-21 20:05:55 +05:30
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print()
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{
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2020-05-07 17:36:34 +05:30
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printf "%b %s\n" "${2:-"\033[1;37m>>\033[m"}" "$1"
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2020-04-21 20:05:55 +05:30
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}
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panic()
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{
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2020-05-07 17:36:34 +05:30
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print "${1:-unexpected error occurred}" \
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2020-05-19 09:59:40 +05:30
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"\033[1;31m!!\033[m" >&2; sh
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2020-01-30 20:10:13 +05:30
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}
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2020-01-28 20:43:42 +05:30
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2020-04-12 01:01:02 +05:30
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findfs()
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{
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2020-05-07 17:36:34 +05:30
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count=0; device=
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2020-04-12 01:01:02 +05:30
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case "${1%%=*}" in
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2020-05-19 09:59:40 +05:30
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/dev/*) device="$1" ;;
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UUID) device="/dev/disk/by-uuid/${1##*=}" ;;
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LABEL) device="/dev/disk/by-label/${1##*=}" ;;
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PARTUUID) device="/dev/disk/by-partuuid/${1##*=}" ;;
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2020-04-12 01:01:02 +05:30
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esac
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2020-05-19 09:59:40 +05:30
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# prevent race condition
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while [ ! -e "$device" ]; do sleep 1
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[ "$(( count += 1 ))" = 30 ] && {
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2020-05-07 17:36:34 +05:30
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panic "failed to lookup partition"
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break
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}
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done || :
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2020-02-21 14:27:07 +05:30
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}
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2020-01-05 23:31:39 +05:30
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2020-04-12 01:01:02 +05:30
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prepare_environment()
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{
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2020-05-07 17:36:34 +05:30
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. /etc/tinyramfs/config
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2020-04-12 01:01:02 +05:30
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export \
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2020-05-19 09:59:40 +05:30
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PATH=/bin TERM=linux SHELL=/bin/sh \
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LANG=C LC_ALL=C PS1="# " HOME=/root \
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2020-03-08 08:59:14 +05:30
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mount -t proc -o nosuid,noexec,nodev proc /proc
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mount -t sysfs -o nosuid,noexec,nodev sys /sys
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2020-05-07 17:36:34 +05:30
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mount -t tmpfs -o nosuid,nodev,mode=0755 run /run
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2020-04-12 01:01:02 +05:30
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mount -t devtmpfs -o nosuid,noexec,mode=0755 dev /dev
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2020-03-08 08:59:14 +05:30
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2020-05-07 17:36:34 +05:30
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mkdir -p \
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/run/cryptsetup \
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/run/lock \
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/run/lvm
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2020-04-12 01:01:02 +05:30
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2020-05-07 17:36:34 +05:30
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ln -s /proc/self/fd /dev/fd
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ln -s fd/0 /dev/stdin
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ln -s fd/1 /dev/stdout
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ln -s fd/2 /dev/stderr
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2020-04-17 23:11:54 +05:30
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2020-05-07 17:36:34 +05:30
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trap panic EXIT
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2020-05-19 09:59:40 +05:30
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[ ! "$modules" ] || modprobe -a "$modules"
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2020-04-12 01:01:02 +05:30
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}
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parse_cmdline()
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{
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read -r cmdline < /proc/cmdline
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2020-05-19 09:59:40 +05:30
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for line in $cmdline; do case "$line" in
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debug | debug=1) set -x ;;
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rootfstype=*) root_type="$line" ;;
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rootflags=*) root_opts="$line" ;;
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ro | rw) rorw=" -o $line" ;;
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*.*) : no operation ;;
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*=*) export "$line" ;;
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*) export "${line}=1" ;;
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2020-04-15 22:20:45 +05:30
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esac; done
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2020-01-30 20:10:13 +05:30
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}
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2020-01-05 23:31:39 +05:30
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2020-04-12 01:01:02 +05:30
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setup_devmgr()
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{
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2020-05-19 09:59:40 +05:30
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[ "$break" = devmgr ] && { print "break before setup_devmgr()"; sh; }
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2020-04-12 01:01:02 +05:30
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2020-02-26 01:13:25 +05:30
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case "$devmgr" in
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udev)
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2020-05-19 09:59:40 +05:30
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udevd -N never & devmgr_pid="$!"
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2020-02-26 01:13:25 +05:30
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udevadm trigger -c add -t subsystems
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udevadm trigger -c add -t devices
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udevadm settle
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2020-04-12 01:01:02 +05:30
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;;
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2020-02-26 01:13:25 +05:30
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mdev)
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2020-05-07 17:36:34 +05:30
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mdev -s
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2020-05-19 09:59:40 +05:30
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mdev -df & devmgr_pid="$!"
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2020-05-07 17:36:34 +05:30
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[ "$monolith" = 1 ] && return 0
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2020-04-12 01:01:02 +05:30
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2020-05-19 09:59:40 +05:30
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set -- $(find /sys -name modalias -exec sort -u {} +)
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modprobe -a "$@" || :
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2020-04-12 01:01:02 +05:30
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;;
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2020-02-26 01:13:25 +05:30
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mdevd)
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2020-05-19 09:59:40 +05:30
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mdevd & devmgr_pid="$!"
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2020-02-26 01:13:25 +05:30
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mdevd-coldplug
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2020-04-12 01:01:02 +05:30
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;;
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2020-05-19 09:59:40 +05:30
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esac 2> /dev/null
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2020-01-30 20:10:13 +05:30
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}
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2020-01-05 23:31:39 +05:30
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2020-04-12 01:01:02 +05:30
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unlock_luks()
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{
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2020-05-19 09:59:40 +05:30
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[ "$break" = luks ] && { print "break before unlock_luks()"; sh; }
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2020-02-26 01:13:25 +05:30
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2020-05-19 09:59:40 +05:30
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{ IFS=,; set -- $luks_opts; unset IFS; }
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2020-02-16 01:03:13 +05:30
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2020-04-15 22:20:45 +05:30
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for opt; do case "$opt" in
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2020-05-19 09:59:40 +05:30
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discard | discard=1) luks_discard="--allow-discards" ;;
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header=*) luks_header="--${opt}" ;;
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name=*) luks_name="${opt##*=}" ;;
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key=*) luks_key="-d ${opt##*=}" ;;
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2020-04-15 22:20:45 +05:30
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esac; done
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2020-02-16 01:03:13 +05:30
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2020-04-12 01:01:02 +05:30
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findfs "$luks_root"
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2020-04-15 22:20:45 +05:30
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set -- \
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2020-04-17 23:11:54 +05:30
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"$luks_key" "$luks_header" \
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"$luks_discard" "$device" \
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2020-04-15 22:20:45 +05:30
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"${luks_name:-luks-${device##*/}}"
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2020-04-12 01:01:02 +05:30
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cryptsetup open $@ || panic "failed to unlock LUKS"
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2020-02-09 23:15:10 +05:30
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}
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2020-04-12 01:01:02 +05:30
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trigger_lvm()
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{
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2020-05-19 09:59:40 +05:30
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[ "$break" = lvm ] && { print "break before trigger_lvm()"; sh; }
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2020-02-25 02:49:29 +05:30
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2020-05-19 09:59:40 +05:30
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{ IFS=,; set -- $lvm_opts; unset IFS; }
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2020-04-12 01:01:02 +05:30
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2020-04-15 22:20:45 +05:30
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for opt; do case "$opt" in
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2020-05-19 09:59:40 +05:30
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discard | discard=1) lvm_discard="--config=devices{issue_discards=1}" ;;
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config=0) : > /etc/lvm/lvm.conf ;;
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group=*) lvm_group="${opt##*=}" ;;
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name=*) lvm_name="/${opt##*=}" ;;
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tag=*) lvm_tag="@${opt##*=}" ;;
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2020-04-15 22:20:45 +05:30
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esac; done
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2020-04-12 01:01:02 +05:30
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2020-05-07 17:36:34 +05:30
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set -- "--sysinit" "-qq" "-aay" "$lvm_discard"
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2020-01-25 16:57:02 +05:30
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2020-02-21 14:27:07 +05:30
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if [ "$lvm_group" ] && [ "$lvm_name" ]; then
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2020-05-07 17:36:34 +05:30
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lvm lvchange $@ "${lvm_group}${lvm_name}"
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2020-02-21 14:27:07 +05:30
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elif [ "$lvm_group" ]; then
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2020-05-07 17:36:34 +05:30
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lvm vgchange $@ "$lvm_group"
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2020-04-12 01:01:02 +05:30
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elif [ "$lvm_tag" ]; then
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2020-05-07 17:36:34 +05:30
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lvm lvchange $@ "$lvm_tag"
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2020-02-21 14:27:07 +05:30
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else
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2020-05-07 17:36:34 +05:30
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lvm vgchange $@
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2020-02-21 14:27:07 +05:30
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fi
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2020-01-28 20:43:42 +05:30
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}
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2020-01-05 23:31:39 +05:30
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2020-04-12 01:01:02 +05:30
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mount_root()
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{
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2020-05-19 09:59:40 +05:30
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[ "$break" = root ] && { print "break before mount_root()"; sh; }
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2020-04-12 01:01:02 +05:30
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findfs "$root"
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2020-04-15 22:20:45 +05:30
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set -- \
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"${root_type:+-t $root_type}" \
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"${rorw:--o ro}${root_opts:+,$root_opts}" \
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"$device" "/mnt/root"
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2020-04-12 01:01:02 +05:30
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mount $@ || panic "failed to mount root"
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2020-01-30 20:10:13 +05:30
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}
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2020-01-05 23:31:39 +05:30
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2020-04-12 01:01:02 +05:30
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cleanup()
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{
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2020-05-19 09:59:40 +05:30
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[ "$break" = cleanup ] && { print "break before cleanup()"; sh; }
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2020-04-12 01:01:02 +05:30
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2020-05-19 09:59:40 +05:30
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kill "$devmgr_pid"
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2020-02-09 23:15:10 +05:30
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2020-04-15 22:20:45 +05:30
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# temporary workaround until util-linux release a new version
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2020-04-12 01:01:02 +05:30
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# see https://github.com/karelzak/util-linux/issues/997
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2020-05-19 09:59:40 +05:30
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for dir in run dev sys proc; do
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2020-05-07 17:36:34 +05:30
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mount -o move "$dir" "/mnt/root/${dir}" ||
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mount --move "$dir" "/mnt/root/${dir}"
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2020-04-12 01:01:02 +05:30
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done
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2020-01-30 20:10:13 +05:30
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}
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2020-01-05 23:31:39 +05:30
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2020-04-12 01:01:02 +05:30
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boot_system()
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{
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2020-05-19 09:59:40 +05:30
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[ "$break" = boot ] && { print "break before boot_system()"; sh; }
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2020-01-30 20:10:13 +05:30
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2020-04-12 01:01:02 +05:30
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set -- "/mnt/root" "${init:-/sbin/init}"
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exec switch_root $@ 2> /dev/null || panic "failed to boot system"
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}
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2020-01-30 20:58:03 +05:30
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2020-04-12 01:01:02 +05:30
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# int main()
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{
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prepare_environment
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parse_cmdline
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setup_devmgr
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2020-02-26 01:13:25 +05:30
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2020-04-15 22:20:45 +05:30
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# trigger lvm twice to handle both LUKS on LVM and LVM on LUKS
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[ "$lvm" = 1 ] && trigger_lvm
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2020-04-12 01:01:02 +05:30
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[ "$luks" = 1 ] && unlock_luks
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[ "$lvm" = 1 ] && trigger_lvm
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2020-02-26 01:13:25 +05:30
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2020-04-12 01:01:02 +05:30
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mount_root
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cleanup
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boot_system
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}
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