define-alpine/modules/runit.lua

mkdir("/etc/runit/runsvdir/default")
add_symlink("/etc/runit/runsvdir/current", "/etc/runit/runsvdir/default")
add_symlink("/etc/service", "/etc/runit/runsvdir/current")

local t = require "../utils/templater"
local function add_executable(path, script)
    add_file(path, script)
    chmod(path, "700")
end
local function add_service(name, script)
    local params = {name = name}
    local run_script_path = t("/etc/sv/{{name}}/run", params)
    add_executable(run_script_path, script)
    add_symlink("/etc/runit/runsvdir/default/"..name, "/etc/sv/"..name)
    add_symlink(
        t("/etc/sv/{{name}}/supervise", params),
        t("/run/runit/supervise.{{name}}", params)
    )
end

modules.runit = {
    add_service = add_service,
}

add_mount("tmpfs /var/log tmpfs defaults 0 0")

-- Estos scripts fueron robados de Void Linux
add_executable("/etc/runit/functions", [[
msg() {
    # bold
    printf "\\033[1m=> $@\\033[m\\n"
}

msg_ok() {
    # bold/green
    printf "\\033[1m\\033[32m OK\\033[m\\n"
}

msg_error() {
    # bold/red
    printf "\\033[1m\\033[31mERROR: $@\\033[m\\n"
}

msg_warn() {
    # bold/yellow
    printf "\\033[1m\\033[33mWARNING: $@\\033[m\\n"
}

emergency_shell() {
    echo
    echo "Cannot continue due to errors above, starting emergency shell."
    echo "When ready type exit to continue booting."
    /bin/sh -l
}

detect_virt() {
   # Detect LXC (and other) containers
   [ -z "${container+x}" ] || export VIRTUALIZATION=1
}

deactivate_vgs() {
   _group=${1:-All}
   if [ -x /sbin/vgchange -o -x /bin/vgchange ]; then
       vgs=$(vgs|wc -l)
       if [ $vgs -gt 0 ]; then
           msg "Deactivating $_group LVM Volume Groups..."
           vgchange -an
       fi
   fi
}

deactivate_crypt() {
   if [ -x /sbin/dmsetup -o -x /bin/dmsetup ]; then
       msg "Deactivating Crypt Volumes"
       for v in $(dmsetup ls --target crypt --exec "dmsetup info -c --noheadings -o open,name"); do
           [ ${v%%:*} = "0" ] && cryptsetup close ${v##*:}
       done
       deactivate_vgs "Crypt"
   fi
}
]])

add_executable("/etc/runit/core-services/00-pseudofs.sh", [[
msg "Mounting pseudo-filesystems..."
mountpoint -q /proc || mount -o nosuid,noexec,nodev -t proc proc /proc
mountpoint -q /sys || mount -o nosuid,noexec,nodev -t sysfs sys /sys
mountpoint -q /run || mount -o mode=0755,nosuid,nodev -t tmpfs run /run
mountpoint -q /dev || mount -o mode=0755,nosuid -t devtmpfs dev /dev
mkdir -p -m0755 /run/runit /run/lvm /run/user /run/lock /run/log /dev/pts /dev/shm
mountpoint -q /dev/pts || mount -o mode=0620,gid=5,nosuid,noexec -n -t devpts devpts /dev/pts
mountpoint -q /dev/shm || mount -o mode=1777,nosuid,nodev -n -t tmpfs shm /dev/shm
mountpoint -q /sys/kernel/security || mount -n -t securityfs securityfs /sys/kernel/security

if [ -d /sys/firmware/efi/efivars ]; then
    mountpoint -q /sys/firmware/efi/efivars || mount -o nosuid,noexec,nodev -t efivarfs efivarfs /sys/firmware/efi/efivars
fi

if [ -z "$VIRTUALIZATION" ]; then
    _cgroupv1=""
    _cgroupv2=""

    case "${CGROUP_MODE:-hybrid}" in
        legacy)
            _cgroupv1="/sys/fs/cgroup"
            ;;
        hybrid)
            _cgroupv1="/sys/fs/cgroup"
            _cgroupv2="${_cgroupv1}/unified"
            ;;
        unified)
            _cgroupv2="/sys/fs/cgroup"
            ;;
    esac

    # cgroup v1
    if [ -n "$_cgroupv1" ]; then
        mountpoint -q "$_cgroupv1" || mount -o mode=0755 -t tmpfs cgroup "$_cgroupv1"
        while read -r _subsys_name _hierarchy _num_cgroups _enabled; do
            [ "$_enabled" = "1" ] || continue
            _controller="${_cgroupv1}/${_subsys_name}"
            mkdir -p "$_controller"
            mountpoint -q "$_controller" || mount -t cgroup -o "$_subsys_name" cgroup "$_controller"
        done < /proc/cgroups
    fi

    # cgroup v2
    if [ -n "$_cgroupv2" ]; then
        mkdir -p "$_cgroupv2"
        mountpoint -q "$_cgroupv2" || mount -t cgroup2 -o nsdelegate cgroup2 "$_cgroupv2"
    fi
fi]])

add_executable("/etc/runit/core-services/01-static-devnodes.sh", [[
# Some kernel modules must be loaded before starting udev(7).
# Load them by looking at the output of `kmod static-nodes`.

for f in $(kmod static-nodes 2>/dev/null|awk '/Module/ {print $2}'); do
	modprobe -bq $f 2>/dev/null
done
]])

add_executable("/etc/runit/core-services/02-udev.sh", [[
[ -n "$VIRTUALIZATION" ] && return 0

if [ -x /sbin/udevd -o -x /bin/udevd ]; then
    _udevd=udevd
else
    msg_warn "cannot find udevd!"
fi

if [ -n "${_udevd}" ]; then
    msg "Starting udev and waiting for devices to settle..."
    ${_udevd} --daemon
    udevadm trigger --action=add --type=subsystems
    udevadm trigger --action=add --type=devices
    udevadm settle
fi
]])


add_executable("/etc/runit/core-services/03-filesystems.sh", [[
[ -n "$VIRTUALIZATION" ] && return 0

#msg "Remounting rootfs read-only..."
#mount -o remount,ro / || emergency_shell

if [ -x /sbin/dmraid -o -x /bin/dmraid ]; then
    msg "Activating dmraid devices..."
    dmraid -i -ay
fi

if [ -x /bin/mdadm ]; then
    msg "Activating software RAID arrays..."
    mdadm -As
fi

if [ -x /bin/btrfs ]; then
    msg "Activating btrfs devices..."
    btrfs device scan || emergency_shell
fi

if [ -x /sbin/vgchange -o -x /bin/vgchange ]; then
    msg "Activating LVM devices..."
    vgchange --sysinit -a ay || emergency_shell
fi

if [ -e /etc/crypttab ]; then
    msg "Activating encrypted devices..."
    awk -f /etc/runit/crypt.awk /etc/crypttab

    if [ -x /sbin/vgchange -o -x /bin/vgchange ]; then
        msg "Activating LVM devices for dm-crypt..."
        vgchange --sysinit -a ay || emergency_shell
    fi
fi

if [ -x /usr/bin/zpool -a -x /usr/bin/zfs ]; then
    if [ -e /etc/zfs/zpool.cache ]; then
        msg "Importing cached ZFS pools..."
        zpool import -N -a -c /etc/zfs/zpool.cache
    else
        msg "Scanning for and importing ZFS pools..."
        zpool import -N -a -o cachefile=none
    fi

    msg "Mounting ZFS file systems..."
    zfs mount -a -l

    msg "Sharing ZFS file systems..."
    zfs share -a

    # NOTE(dh): ZFS has ZVOLs, block devices on top of storage pools.
    # In theory, it would be possible to use these as devices in
    # dmraid, btrfs, LVM and so on. In practice it's unlikely that
    # anybody is doing that, so we aren't supporting it for now.
fi

[ -f /fastboot ] && FASTBOOT=1
[ -f /forcefsck ] && FORCEFSCK="-f"
for arg in $(cat /proc/cmdline); do
    case $arg in
        fastboot) FASTBOOT=1;;
        forcefsck) FORCEFSCK="-f";;
    esac
done

if [ -z "$FASTBOOT" ]; then
    msg "Checking filesystems:"
    fsck -A -T -a -t noopts=_netdev $FORCEFSCK
    if [ $? -gt 1 ]; then
s        emergency_shell
    fi
fi

msg "Mounting all non-network filesystems..."
mount -a -t "nosysfs,nonfs,nonfs4,nosmbfs,nocifs" -O no_netdev || emergency_shell
]])

add_executable("/etc/runit/core-services/04-swap.sh", [[
[ -n "$VIRTUALIZATION" ] && return 0

msg "Initializing swap..."
swapon -a || emergency_shell
]])

add_executable("/etc/runit/core-services/05-misc.sh", [[
install -m0664 -o root -g utmp /dev/null /run/utmp
#halt -B  # for wtmp

msg "Setting up loopback interface..."
ip link set up dev lo
]])

-- Initial boot
add_executable("/etc/runit/1", [[#!/bin/sh

PATH=/bin:/usr/bin:/usr/sbin:/sbin

. /etc/runit/functions

msg "Welcome to Nulo!"

[ -r /etc/rc.conf ] && . /etc/rc.conf

# Start core services: one-time system tasks.
detect_virt
for f in /etc/runit/core-services/*.sh; do
	[ -r $f ] && . $f
done

dmesg >/var/log/dmesg.log
if [ $(sysctl -n kernel.dmesg_restrict 2>/dev/null) -eq 1 ]; then
	chmod 0600 /var/log/dmesg.log
else
	chmod 0644 /var/log/dmesg.log
fi

# create files for controlling runit
mkdir -p /run/runit
install -m000 /dev/null /run/runit/stopit
install -m000 /dev/null /run/runit/reboot

msg "Initialization complete, running stage 2..."
]])
add_executable("/etc/runit/2", [[#!/bin/sh
PATH=/bin:/usr/bin:/usr/sbin:/sbin

runlevel=default
for arg in $(cat /proc/cmdline); do
    if [ -d /etc/runit/runsvdir/"$arg" ]; then
        echo "Runlevel detected: '$arg' (via kernel cmdline)"
        runlevel="$arg"
    fi
done

[ -x /etc/rc.local ] && /etc/rc.local

runsvchdir "${runlevel}"
mkdir -p /run/runit/runsvdir
ln -s /etc/runit/runsvdir/current /run/runit/runsvdir/current

exec env - PATH=$PATH \
    runsvdir -P /run/runit/runsvdir/current 'log: ................................'
]])

-- Shutdown
add_executable("/etc/runit/3", [[#!/bin/sh
PATH=/bin:/usr/bin:/usr/sbin:/sbin

. /etc/runit/functions
detect_virt
[ -r /etc/rc.conf ] && . /etc/rc.conf

echo
msg "Waiting for services to stop..."
sv force-stop /etc/service/*
sv exit /etc/service/*

[ -x /etc/rc.shutdown ] && /etc/rc.shutdown

if [ -z "$VIRTUALIZATION" -a -n "$HARDWARECLOCK" ]; then
    hwclock --systohc ${HARDWARECLOCK:+--$(echo $HARDWARECLOCK |tr A-Z a-z)}
fi

halt -w  # for wtmp

if [ -z "$VIRTUALIZATION" ]; then
    msg "Stopping udev..."
    udevadm control --exit
fi

msg "Sending TERM signal to processes..."
pkill --inverse -s0,1 -TERM
sleep 1
msg "Sending KILL signal to processes..."
pkill --inverse -s0,1 -KILL

if [ -z "$VIRTUALIZATION" ]; then
    msg "Unmounting filesystems, disabling swap..."
    swapoff -a
    umount -r -a -t nosysfs,noproc,nodevtmpfs,notmpfs
    msg "Remounting rootfs read-only..."
    mount -o remount,ro /
fi

sync

if [ -z "$VIRTUALIZATION" ]; then
    deactivate_vgs
    deactivate_crypt
    if [ -e /run/runit/reboot ] && command -v kexec >/dev/null; then
        msg "Triggering kexec..."
        kexec -e 2>/dev/null
        # not reached when kexec was successful.
    fi
fi
]])

add_packages({ "runit", "procps", "eudev" })
modules.runit.add_service("getty-tty1", [[#!/bin/sh
exec chpst -P getty 38400 tty1 linux]])
modules.runit.add_service("getty-tty2", [[#!/bin/sh
exec chpst -P getty 38400 tty2 linux]])