171 lines
4.3 KiB
Plaintext
171 lines
4.3 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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# store output in variable
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read -r cmdline < /proc/cmdline
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# turn output into list
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set -f && set +f -- $cmdline
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for line in "$@"; do
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value="${line##*=}"
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case "${line%%=*}" in
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debug) debug="$value" ;;
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init) init="$value" ;;
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root) root="$value" ;;
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root.type) root_type="$value" ;;
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root.opts) root_opts="$value" ;;
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lvm) lvm="$value" ;;
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lvm.name) lvm_name="$value" ;;
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lvm.group) lvm_group="$value" ;;
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lvm.args) lvm_args="$value" ;;
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luks) luks="$value" ;;
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luks.root) luks_root="$value" ;;
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luks.name) luks_name="$value" ;;
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luks.discard) luks_discard="$value" ;;
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luks.args) luks_args="$value" ;;
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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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mount_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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}
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setup_devmgr() {
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case "$devmgr" in
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udev)
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udevd -d
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udevadm trigger -c add -t subsystems
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udevadm trigger -c add -t devices
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udevadm settle
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;;
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mdev)
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uevent mdev &
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mdev -s
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for device in /sys/bus/usb/devices/*; do
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case "${device##*/}" in [0-9]*-[0-9]*)
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printf add > "${device}/uevent" ;;
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esac
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done
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find /sys -name modalias -type f -exec sort -u {} + |
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xargs modprobe -b > /dev/null 2>&1
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;;
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mdevd)
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mdevd &
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mdevd-coldplug
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;;
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*)
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panic "devmgr option broken"
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;;
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esac
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}
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findfs_sh() {
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value="${1##*=}"
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case "${1%%=*}" in
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LABEL) device="/dev/disk/by-label/${value}" ;;
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UUID) device="/dev/disk/by-uuid/${value}" ;;
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PARTUUID) device="/dev/disk/by-partuuid/${value}" ;;
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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 $luks_args \
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luksOpen \
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$(findfs_sh "$luks_root") \
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${luks_name:-luks_root} ||
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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 $lvm_args --sysinit -q -a y "${lvm_group}/${lvm_name}" > /dev/null
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elif [ "$lvm_group" ]; then
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lvm vgchange $lvm_args --sysinit -q -a y "$lvm_group" > /dev/null
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else
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lvm vgchange $lvm_args --sysinit -q -a y > /dev/null
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fi
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}
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mount_rootfs() {
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mount ${root_type:+-t $root_type} \
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${root_opts:+-o $root_opts} \
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$(findfs_sh "$root") \
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/mnt/root ||
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panic "failed to mount rootfs"
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}
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cleanup() {
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case "$devmgr" in
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udev) udevadm control -e ;;
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mdev) killall uevent ;;
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mdevd) killall mdevd ;;
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esac
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# unmount pseudofs's
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umount /dev /sys /proc
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}
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boot_system() {
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exec switch_root /mnt/root \
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${init:-/sbin/init} ||
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panic "failed to boot system"
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}
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/sbin/busybox --install -s
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. /config || panic "failed to source config"
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mount_pseudofs
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parse_cmdline
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[ "$debug" = 1 ] && set -x
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setup_devmgr
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# TODO handle situations when LUKS on LVM
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[ "$luks" = 1 ] &&
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command -v cryptsetup > /dev/null 2>&1 && unlock_luks
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[ "$lvm" = 1 ] &&
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command -v lvm > /dev/null 2>&1 && trigger_lvm
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mount_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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