installdos

#!/bin/sh

SOURCE="$1"
DRIVE_ROOT="$2"

DOS_DIRECTORY=dos

if which msexpand >/dev/null 2>&1 ; then
  MSEXPAND=msexpand
elif which dosemu-msexpand >/dev/null 2>&1 ; then
  MSEXPAND=dosemu-msexpand
else
  echo "msexpand tool not found!"
  exit 1
fi

extract_freedos_archives()
{
  for filename in $(ls $SOURCE/*.zip)
  do
    unzip -d "$DRIVE_ROOT" -qq -o -LL "$filename" -x packages/* source/* bin/kernl86.sys 2>/dev/null
  done
}

extract_freedos_lib()
{
  unzip -d "$DRIVE_ROOT"/bin -qq -LL -o -j "${SOURCE}"/lib.zip llib32/lib.exe
  unzip -d "$DRIVE_ROOT"/doc/lib -qq -o -LL -j "${SOURCE}"/lib.zip llib32/readme
}

install_freedos()
{
  echo Installing FreeDOS...
  mkdir -p "${DRIVE_ROOT}"
  extract_freedos_archives
  extract_freedos_lib

  ln -s swsubst.exe "${DRIVE_ROOT}"/bin/join.exe
  ln -s swsubst.exe "${DRIVE_ROOT}"/bin/subst.exe
  mv "${DRIVE_ROOT}"/bin/kernl386.sys "${DRIVE_ROOT}"/kernel.sys
  ln -s bin/command.com "${DRIVE_ROOT}"/command.com

  chmod 644 "${DRIVE_ROOT}"/appinfo/* "${DRIVE_ROOT}"/bin/* "${DRIVE_ROOT}"/doc/*/* "${DRIVE_ROOT}"/nls/*
  chmod 755 "${DRIVE_ROOT}"/doc/*

  echo Installation complete
}

expand_files_with_extension()
{
  EXTENSION=$1
  EXTENSION_COMPRESSED="${1%?}_"
  EXTENSION_CUT="${1%?}"
  ls "$SOURCE"/*.$EXTENSION_COMPRESSED > /dev/null 2> /dev/null
  if [ $? -eq 0 ] # continue only if there are compressed files with this extension
  then
    for i in "$SOURCE"/*.$EXTENSION_COMPRESSED
    do
      $MSEXPAND "$i" ${DRIVE_ROOT}/"${DOS_DIRECTORY}"/$(basename "${i%.???}.$EXTENSION")
    done
  fi
}

move_to_rootdir()
{
  mv "${DRIVE_ROOT}"/"${DOS_DIRECTORY}"/$1 "${DRIVE_ROOT}"/ 2> /dev/null
}

# Manual MS-DOS installation as described in Microsoft KB117245
install_msdos()
{
  echo Installing MS-DOS...
  mkdir -p "${DRIVE_ROOT}"/"${DOS_DIRECTORY}"

  # it's not possible to deduce the final letter of the extension, so we have to provide the list
  EXTENSION_LIST="inf 386 bin com cpi dll exe ovl sys txt grp hlp lst pro"

  # fill C:\DOS
  for extension in $EXTENSION_LIST
  do
    cp "$SOURCE"/*.$extension "${DRIVE_ROOT}"/"${DOS_DIRECTORY}" 2> /dev/null
    expand_files_with_extension $extension
  done

  ROOTDIR_FILES="wina20.386 ???space.bin io.sys msdos.sys command.com"

  for rootdir_file in $ROOTDIR_FILES
  do
    move_to_rootdir $rootdir_file
  done
  echo Installation complete
}

extract_7z()
{
  ARCHIVE="$1"
  FILENAME="$2"
  DESTINATION_DIR=$3
  echo Extracting $FILENAME
  7z e "$ARCHIVE" $FILENAME -o"$DESTINATION_DIR" -y -ssc- >/dev/null
}

install_opendos_from_rpm()
{
  TMP_DIR=/tmp/"$(basename $0)-$USER-$$"
  mkdir -p "$TMP_DIR" "${DRIVE_ROOT}"
  extract_7z $SOURCE/opendos-hdimage*.rpm "" "$TMP_DIR"
  extract_7z "$TMP_DIR"/opendos-hdimage*.cpio hdimage.od "$TMP_DIR"
  MTOOLS_LOWER_CASE=1 mcopy -sn -i "$TMP_DIR"/hdimage.od@@32384 ::* "${DRIVE_ROOT}"
  rm -r "$TMP_DIR"
}

# Detect which DOS is provided and run the appropriate installation routine

if [ -e $SOURCE/kernel.zip ] ; then
  install_freedos
  exit 0
fi

if [ -e $SOURCE/msdos.sys ] ; then
  install_msdos
  exit 0
fi

if [ -e $SOURCE/opendos-hdimage*.rpm ] ; then
  install_opendos_from_rpm
  exit 0
fi

echo "No DOS installation files were found."
echo "Run loaddosinstall as root to download a version of DOS."
exit 1