reimplement init using functions

This commit is contained in:
illiliti 2020-01-30 17:40:13 +03:00
parent e0e0f81ab1
commit 6ffbecfc88

124
init
View File

@ -1,40 +1,31 @@
#!/sbin/busybox sh
#
# tiny init script
# debugging
set -x
panic() {
printf "panic >> %s\n" "$@"
exit 1
}
# install busybox
/sbin/busybox --install -s
panic() { echo "bruh moment :(" && sh; }
# silence is golden
#echo 0 >/proc/sys/kernel/printk
info() {
printf "info >> %s\n" "$@"
}
# parse_cmdline() {
# TODO parse /proc/cmdline
#}
# check config
[ -f /config ] && . /config || panic
mnt_pseudofs() {
# mount pseudofs's
mount -t proc none /proc
mount -t sysfs none /sys
mount -t devtmpfs none /dev
}
# handle device managers
if [ "$use_mdevd" = 1 ]; then
# setup mdevd
mdevd &
# trigger uevents
mdevd-coldplug
# TODO investigate this
# avoid race condition
sleep 1.5
elif [ "$use_mdev" = 1 ]; then
use_mdev() {
# setup mdev
if [ -e /proc/sys/kernel/hotplug ]; then
echo /sbin/mdev >/proc/sys/kernel/hotplug
printf /sbin/mdev >/proc/sys/kernel/hotplug
else
uevent mdev &
fi
@ -46,50 +37,99 @@ elif [ "$use_mdev" = 1 ]; then
for u in /sys/bus/usb/devices/*; do
case ${u##*/} in
[0-9]*-[0-9]*)
echo add > "$u/uevent"
printf add > "${u}/uevent"
;;
esac
done
# load drivers
find /sys -name 'modalias' -type f -exec cat '{}' + | sort -u | xargs modprobe -ba
elif [ "$use_udev" = 1 ]; then
}
use_mdevd() {
# setup mdevd
mdevd &
# trigger uevents
mdevd-coldplug
# TODO investigate this
# avoid race condition
sleep 1.5
}
use_udev() {
# setup udev
udevd --daemon
udevadm trigger --action=add --type=subsystems
udevadm trigger --action=add --type=devices
udevadm settle
else
panic
fi
# TODO handle situations when LUKS on LVM
# unlock cryptsetup container
[ "$use_luks" = 1 ] && {
luks_root="$(findfs $luks_root)"
# TODO improve mapper name ( crypttab or config option )
cryptsetup $luks_args luksOpen "$luks_root" luks_root || panic
}
unlock_luks() {
# find device of luks root
luks_root="$(findfs $luks_root)"
# TODO improve mapper name ( crypttab or config option )
# unlock luks container
cryptsetup $luks_args luksOpen "$luks_root" luks_root || panic "failed to unlock luks container"
}
trigger_lvm() {
# manually trigger LVM if udev disabled
[ "$use_lvm" = 1 ] && [ "$use_udev" = 0 ] && {
lvm vgchange --sysinit -a y
}
mnt_rootfs() {
# merge mount flags
[ -n "$root_args" ] && mount_args="$root_args"
[ -n "$root_type" ] && mount_args="$mount_args -t $root_type"
# mount rootfs
mount $mount_args "$root" /mnt/root || panic
mount $mount_args "$root" /mnt/root || panic "failed to mount rootfs"
}
cleanup() {
# clean up
[ "$use_mdev" = 1 ] && { printf "" >/proc/sys/kernel/hotplug || killall uevent; } >/dev/null 2>&1
[ "$use_mdevd" = 1 ] && killall mdevd
[ "$use_mdev" = 1 ] && { echo "" >/proc/sys/kernel/hotplug || killall uevent; }
[ "$use_udev" = 1 ] && udevadm control --exit
umount /dev /sys /proc
}
boot_system() {
# boot system
echo SUCCESS
exec switch_root /mnt/root /sbin/init
[ "$debug" = 1 ] && info SUCCESS
exec switch_root /mnt/root /sbin/init || panic "failed to boot system"
}
if [ "$debug" = 1 ]; then
# debug shell commands
set -x
else
# silence is golden
printf 0 >/proc/sys/kernel/printk
fi
# install busybox
/sbin/busybox --install -s
# check config
if [ -e /config ]; then
. /config
else
panic "config doesn't exists"
fi
#parse_cmdline
mnt_pseudofs
case "$devmgr" in
mdev) use_mdev ;;
mdevd) use_mdevd ;;
udev) use_udev ;;
esac
# TODO handle situations when LUKS on LVM
[ "$use_luks" = 1 ] && unlock_luks
[ "$use_lvm" = 1 ] && [ "$use_udev" = 0 ] && trigger_lvm
mnt_rootfs
cleanup
boot_system