#!/bin/busybox sh
# shellcheck shell=dash
# WardenOS QEMU device sim: initramfs /init (PID 1).
#
# Phase-1 duty: prove the kernel booted on -M virt; print the sentinel the
# smoke test greps for, then power off (PSCI SYSTEM_OFF, so qemu exits).
# `warden.shell` on the kernel cmdline drops to an interactive shell instead.

/bin/busybox mount -t devtmpfs devtmpfs /dev 2>/dev/null

# The cpio archive carries no device nodes (it is built unprivileged, no
# mknod); reopen stdio on the real console now that devtmpfs is mounted.
exec </dev/console >/dev/console 2>&1

/bin/busybox --install -s /bin
mount -t proc proc /proc
mount -t sysfs sysfs /sys

echo "WARDEN-QEMU-BOOT-OK"

# With a virtio disk attached, hand over to the stage-1 rc (by-name symlinks,
# slot select, switch_root). It only returns on failure; then fall through to
# the diskless shell/poweroff behavior below.
if [ -b /dev/vda ]; then
    # shellcheck source=qemu/rootfs/etc/rc disable=SC1091
    . /etc/rc
fi

if grep -qw warden.shell /proc/cmdline; then
    echo "warden.shell: interactive shell (exit to power off)"
    setsid cttyhack sh
fi

poweroff -f