init

#!/bin/bash
# Unikernel Linux
# Copyright (C) 2018-2022 Red Hat Inc., Boston University,
# Ali Raza, Tommy Unger, Eric Munson, Richard W.M. Jones.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

# This is the init script that runs inside the unikernel when it first
# boots.

echo Starting /init script ...

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

# Make sure /tmp /var/tmp are real directories, not symlinks.
if [ ! -d /tmp ] || [ ! -d /var/tmp ]; then
    rm -f /tmp /var/tmp
    mkdir /tmp /var/tmp
    chmod 1777 /tmp /var/tmp
fi

mkdir -p /proc /sys
mount -t proc none /proc
mount -t sysfs none /sys
#mount -t debugfs none /sys/kernel/debug/

# devtmpfs is required since udev 176
mount -t devtmpfs /dev /dev
ln -s /proc/self/fd /dev/fd

mkdir -p /dev/pts /dev/shm
mount -t devpts /dev/pts /dev/pts
mount -t tmpfs -o mode=1777 shmfs /dev/shm

mkdir -p /run
mount -t tmpfs -o "nosuid,size=20%,mode=0755" tmpfs /run
mkdir -p /run/lock
ln -s ../run/lock /var/lock

# Static nodes must happen before udev is started.

# Set up kmod static-nodes (RHBZ#1011907).
mkdir -p /run/tmpfiles.d
kmod static-nodes --format=tmpfiles --output=/run/tmpfiles.d/kmod.conf

# Create a machine-id with a random UUID
machine_id=$(dd if=/dev/urandom bs=16 count=1 status=none | od -x -A n)
echo "${machine_id// /}" > /etc/machine-id

# Set up tmpfiles (must run after kmod.conf is created above).
systemd-tmpfiles --prefix=/dev --prefix=/run --prefix=/var/run --create --boot

# Find udevd and run it directly.
for f in /lib/systemd/systemd-udevd /usr/lib/systemd/systemd-udevd \
    /sbin/udevd /lib/udev/udevd \
    /usr/lib/udev/udevd; do
  if [ -x "$f" ]; then UDEVD="$f"; break; fi
done
if [ -z "$UDEVD" ]; then
  echo "error: udev not found!  Things will probably not work ..."
fi

$UDEVD --daemon #--debug
udevadm trigger
udevadm settle --timeout=600

exec /bin/bash