#!/bin/bash

cd "$(dirname "$0")"
SCRIPT_DIR="$(pwd)"

read -p "Enter Mount Point [/mnt/sysroot]: " TARGET_SYSROOT

TARGET_SYSROOT=${TARGET_SYSROOT:-"/mnt/sysroot"}

if [ "$TARGET_SYSROOT" == "/mnt/sysroot" ]; then
  if [ ! -f "$TARGET_SYSROOT/.linuxnt" ]; then
    INSTALL_SYSTEM=1
  fi
fi

# -----------------------------------------------------------------------------

dossetup() {
  read -p "Press enter to prep the virtual filesystems..."
  mkdir -pv {$TARGET_SYSROOT/dev/pts,$TARGET_SYSROOT/dev/shm,$TARGET_SYSROOT/etc,$TARGET_SYSROOT/proc,$TARGET_SYSROOT/run,$TARGET_SYSROOT/sys}
  cp -v /etc/resolv.conf $TARGET_SYSROOT/etc/resolv.conf
}

dosconfig() {
  echo "Mounting virtual filesystems..."
  mount -v --bind /dev $TARGET_SYSROOT/dev
  mount -vt devpts devpts -o gid=5,mode=0620 $TARGET_SYSROOT/dev/pts
  mount -vt proc proc $TARGET_SYSROOT/proc
  mount -vt sysfs sysfs $TARGET_SYSROOT/sys
  mount -vt tmpfs tmpfs $TARGET_SYSROOT/run

  if [ -h $TARGET_SYSROOT/dev/shm ]; then
    install -v -d -m 1777 $TARGET_SYSROOT$(realpath /dev/shm)
  else
    mount -vt tmpfs -o nosuid,nodev tmpfs $TARGET_SYSROOT/dev/shm
  fi
}

winnt32() {
  read -p "Press enter to begin the installation."

  dnf4 install --installroot=$TARGET_SYSROOT --releasever=42 --setopt=install_weak_deps=False --setopt=keepcache=False --nodocs --refresh \
    @custom-environment \
    bc \
    dbus-daemon \
    curl \
    htop \
    nano \
    python2* \
    rsyslog \
    traceroute \
    unzip \
    wget \
    zip \
    screen \
    net-tools \
    dos2unix \
    rsync \
    time \
    tree \
    whois \
    git \
    curl \
    wimlib* \
    cracklib-dicts \
    -x ccache \
    -x plymouth* \
    -x audit \
    -x abrt* \
    -x firewall* \
    -x vim* \
    -x audit \
    -x zram*

  touch $TARGET_SYSROOT/.linuxnt

  read -p "Install either worked or it didn't. Press enter to continue."
}

ntldr() {
  echo -e "\nEntering $TARGET_SYSROOT..."
  echo -e "\n================================================================================"
  echo -e "\nOpen Source Linux NT [Version $(uname -r)]\n$(uname -v)\n"
  chroot "$TARGET_SYSROOT" /usr/bin/env -i   \
      HOME=/root                  \
      TERM="$TERM"                \
      PS1="(Linux NT) \u:\w \$ "  \
      PATH=/bin:/usr/bin:/usr/sbin     \
      MAKEFLAGS="-j$(nproc)"      \
      TESTSUITEFLAGS="-j$(nproc)" \
      /bin/bash --login
  echo -e "\n================================================================================\n"
}

dosexit() {
  echo "Unmounting virtual filesystems..."
  umount -v $TARGET_SYSROOT/dev/pts
  mountpoint -q $TARGET_SYSROOT/dev/shm && umount -v $TARGET_SYSROOT/dev/shm
  umount -v $TARGET_SYSROOT/dev
  umount -v $TARGET_SYSROOT/run
  umount -v $TARGET_SYSROOT/proc
  umount -v $TARGET_SYSROOT/sys
}

# -----------------------------------------------------------------------------

# Setup filesystem
if [ -n "$INSTALL_SYSTEM" ]; then
  dossetup
fi

# Mount virtual filesystems
dosconfig

# Install system
if [ -n "$INSTALL_SYSTEM" ]; then
  winnt32
fi

# Chroot to system
ntldr

# Unmount virtual filesystems
dosexit