180 lines
3.7 KiB
Plaintext
180 lines
3.7 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" && sh
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}
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# parse_cmdline() {
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# TODO parse /proc/cmdline
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#}
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# mount pseudofs's
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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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use_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 u in /sys/bus/usb/devices/*; do
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case ${u##*/} in
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[0-9]*-[0-9]*)
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printf add > "${u}/uevent"
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;;
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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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use_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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# TODO investigate this
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# avoid race condition
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sleep 1.5
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}
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# setup udev
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use_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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# shell findfs
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findfs_sh() {
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case "${1%%=*}" in
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LABEL)
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printf "/dev/disk/by-label/%s\n" "${1##*=}"
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;;
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UUID)
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printf "/dev/disk/by-uuid/%s\n" "${1##*=}"
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;;
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PARTUUID)
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printf "/dev/disk/by-partuuid/%s\n" "${1##*=}"
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;;
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/dev/*)
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printf "%s\n" "$1"
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;;
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*)
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panic "findfs option broken"
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;;
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esac
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}
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# unlock LUKS container
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unlock_luks() {
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# find device of luks root
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luks_root="$(findfs_sh $luks_root)"
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# TODO investigate this
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# avoid race condition
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[ "$devmgr" != "udev" ] && sleep 1.5
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# TODO improve mapper name ( crypttab or config option )
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# unlock luks container
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cryptsetup $luks_args luksOpen "$luks_root" luks_root || panic "failed to unlock luks container"
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}
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# manually trigger LVM if udev disabled
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trigger_lvm() {
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lvm vgchange --quiet --sysinit -a y > /dev/null
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}
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# mount rootfs to /mnt/root
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mnt_rootfs() {
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# merge mount flags
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[ -n "$root_args" ] && mount_args="$root_args"
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[ -n "$root_type" ] && mount_args="$mount_args -t $root_type"
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# find root
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root="$(findfs_sh $root)"
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# mount rootfs
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mount $mount_args "$root" /mnt/root || panic "failed to mount rootfs"
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}
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# kill and unmount
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cleanup() {
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case "$devmgr" in
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mdev)
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# stop mdev
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{ printf "" > /proc/sys/kernel/hotplug || killall uevent; } > /dev/null 2>&1
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;;
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mdevd)
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# stop mdevd
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killall mdevd
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;;
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udev)
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# stop udev
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udevadm control --exit
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;;
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esac
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# TODO re-do
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# if debug mode off then restore kernel logging
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[ "$debug" = 0 ] && printf 1 > /proc/sys/kernel/printk
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# unmount pseudofs's
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umount /dev /sys /proc /tmp
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}
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# exec /mnt/root/sbin/init
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boot_system() {
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exec switch_root /mnt/root /sbin/init || panic "failed to boot system"
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}
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# install busybox
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/sbin/busybox --install -s
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# source config
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. /config || panic "config doesn't exists"
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# TODO re-do
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if [ "$debug" = 1 ]; then
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# debug shell commands
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set -x
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else
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# silence is golden
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printf 0 > /proc/sys/kernel/printk
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fi
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#parse_cmdline
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mnt_pseudofs
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case "$devmgr" in
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mdev) use_mdev ;;
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mdevd) use_mdevd ;;
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udev) use_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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[ "$use_luks" = 1 ] && unlock_luks
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[ "$use_lvm" = 1 ] && [ "$devmgr" != "udev" ] && trigger_lvm
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mnt_rootfs
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cleanup
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boot_system
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