163 lines
4.2 KiB
Plaintext
163 lines
4.2 KiB
Plaintext
#!/sbin/busybox sh
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#
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# tiny init script
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panic() {
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printf "panic >> %s\n" "$1"
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# TODO fix job control
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sh -l
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}
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parse_cmdline() {
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# turn output into list
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set -- $(cat /proc/cmdline)
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# parse line by line
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for line in "$@"; do
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# parse options
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case "${line%%=*}" in
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debug) debug="${line##*=}" ;;
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init) init="${line##*=}" ;;
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root) root="${line##*=}" ;;
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root.type) root_type="${line##*=}" ;;
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root.opts) root_opts="${line##*=}" ;;
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lvm) lvm="${line##*=}" ;;
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lvm.name) lvm_name="${line##*=}" ;;
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lvm.group) lvm_group="${line##*=}" ;;
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lvm.args) lvm_args="${line##*=}" ;;
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luks) luks="${line##*=}" ;;
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luks.root) luks_root="${line##*=}" ;;
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luks.name) luks_name="${line##*=}" ;;
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luks.discard) luks_discard="${line##*=}" ;;
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luks.args) luks_args="${line##*=}" ;;
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# TODO implement
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#lvm.discard) ;;
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#lvm.conf) ;;
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#luks_header) ;;
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#luks_keyfile) ;;
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esac
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done
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}
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mnt_pseudofs() {
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mount -t proc none /proc
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mount -t sysfs none /sys
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mount -t devtmpfs none /dev
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mount -t tmpfs none /tmp
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}
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setup_mdev() {
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# setup hotplugger
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if [ -e /proc/sys/kernel/hotplug ]; then
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printf /sbin/mdev > /proc/sys/kernel/hotplug
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else
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uevent mdev &
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fi
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# trigger mdev
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mdev -s
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# trigger uevent for usb devices
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for device in /sys/bus/usb/devices/*; do
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case "${device##*/}" in
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[0-9]*-[0-9]*) printf add > "${device}/uevent" ;;
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esac
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done
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# load drivers
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find /sys -name modalias -type f -exec sort -u "{}" "+" | xargs modprobe -qba
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}
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setup_mdevd() {
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# setup daemon
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mdevd &
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# trigger uevents
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mdevd-coldplug
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}
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setup_udev() {
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udevd --daemon
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udevadm trigger --action=add --type=subsystems
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udevadm trigger --action=add --type=devices
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udevadm settle
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}
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findfs_sh() {
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case "${1%%=*}" in
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LABEL) device="/dev/disk/by-label/${1##*=}" ;;
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UUID) device="/dev/disk/by-uuid/${1##*=}" ;;
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PARTUUID) device="/dev/disk/by-partuuid/${1##*=}" ;;
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/dev/*) device="$1" ;;
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*) panic "findfs option broken" ;;
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esac
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# avoid race condition
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while [ ! -e "$device" ]; do
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sleep 0.5
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[ "$increment" ] || increment=0
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increment=$(( increment + 1 ))
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[ "$increment" = 10 ] && panic "failed to lookup partition"
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done
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printf "%s\n" "$device"
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}
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unlock_luks() {
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[ "$luks_discard" = 1 ] && luks_args="--allow-discards $luks_args"
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cryptsetup $luks_args luksOpen $(findfs_sh "$luks_root") ${luks_name:-luks_root} || panic "failed to unlock luks container"
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}
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trigger_lvm() {
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if [ "$lvm_group" ] && [ "$lvm_name" ]; then
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lvm lvchange $lvm_args --quiet --sysinit -a y "${lvm_group}/${lvm_name}" > /dev/null
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elif [ "$lvm_group" ]; then
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lvm vgchange $lvm_args --quiet --sysinit -a y "$lvm_group" > /dev/null
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else
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lvm vgchange $lvm_args --quiet --sysinit -a y > /dev/null
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fi
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}
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mnt_rootfs() {
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mount ${root_type:+-t $root_type} ${root_opts:+-o $root_opts} $(findfs_sh "$root") /mnt/root || panic "failed to mount rootfs"
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}
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cleanup() {
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case "$devmgr" in
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mdev) { printf "" > /proc/sys/kernel/hotplug || killall uevent; } > /dev/null 2>&1 ;;
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mdevd) killall mdevd ;;
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udev) udevadm control --exit ;;
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esac
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# unmount pseudofs's
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umount /dev /sys /proc /tmp
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}
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boot_system() {
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exec switch_root /mnt/root ${init:-/sbin/init} || panic "failed to boot system"
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}
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/sbin/busybox --install -s
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. /config || panic "failed to source config"
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mnt_pseudofs
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parse_cmdline
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# debug mode
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[ "$debug" = 1 ] && set -x
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case "$devmgr" in
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mdev) setup_mdev ;;
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mdevd) setup_mdevd ;;
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udev) setup_udev ;;
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*) panic "devmgr option broken" ;;
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esac
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# TODO handle situations when LUKS on LVM
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[ "$luks" = 1 ] && [ -x "$(command -v cryptsetup)" ] && unlock_luks
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[ "$lvm" = 1 ] && [ -x "$(command -v lvm)" ] && trigger_lvm
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mnt_rootfs
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[ "$debug" = 1 ] && panic "dropping to shell"
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cleanup
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boot_system
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