Get_CRTM_Binary_Files.sh

#https://bin.ssec.wisc.edu/pub/s4/CRTM/fix_REL-3.1.1.2.tgz  (use this for jedi and stand-alone, some files have changed).

# This script is used to manually download the tarball of binary and netcdf coefficient files.
# The same files also download automatically during the cmake step, so you don't have to actually run this manually. 

foldername="fix_REL-3.1.1.2"
checksum=58e0a5c698a438a31dc4914fcda39846
filename="${foldername}.tgz"
download_url=https://bin.ssec.wisc.edu/pub/s4/CRTM/$filename

usage() {
    echo "Usage: $0 [-h] [-d TARBALL_PATH/filename.tgz]" 1>&2
    echo "   Call without flags to download the coefficients and extract to a default location." 1>&2
    echo "   -h: show help" 1>&2
    echo "   -d: download tarball to specified location without extracting." 1>&2
}

DOWNLOAD_ONLY_PATH=""
while getopts "hd:" opt; do
  case "$opt" in
    h)
      usage
      exit 0
      ;;
    d)
      DOWNLOAD_ONLY_PATH=$OPTARG
      ;;
  esac
done

if [ -n "${DOWNLOAD_ONLY_PATH}" ]; then
    echo "Downloading coefficients ${foldername} to file \"${DOWNLOAD_ONLY_PATH}\" and exiting."
    wget --no-verbose $download_url -O "${DOWNLOAD_ONLY_PATH}"
    exit 0
fi

# Check if the fix directory already exists, indicating that no download is needed.
if [ -d "fix/" ]; then #fix directory exists
    echo "fix/ already exists, doing nothing."
    exit 0
fi

# If var $CRTM_BINARY_FILES_TARBALL is set, confirm the file exists and  confirm
# the checksum then update the "filename" var.
if [ -n "${CRTM_BINARY_FILES_TARBALL}" ]; then
    echo "Found CRTM_BINARY_FILES_TARBALL=${CRTM_BINARY_FILES_TARBALL}"

    # Since the tarball var is set, verify the file exists then verify the
    # checksum. Failure here will stop and throw an error.
    if [ ! -f "$CRTM_BINARY_FILES_TARBALL" ]; then
        echo "But no file exists at this path. Fix the file path or unset this variable"
        exit 1
    fi
    local_checksum=$(md5sum $CRTM_BINARY_FILES_TARBALL | cut -d ' ' -f 1)
    if [ "${local_checksum}" = "${checksum}" ]; then
        filename=$CRTM_BINARY_FILES_TARBALL
    else
        # Exit with failure.
        echo "Var CRTM_BINARY_FILES_TARBALL is set but does not match expected"
        echo "checksum of $checksum. Confirm you have the correct tarball and"
        echo "try again, or unset this variable"
        exit 1
    fi
fi

# If the file is not present in the pwd (or otherwise provided by
# CRTM_BINARY_FILES_TARBALL as already verified), download the coefficients file.
if ! test -f "$filename"; then
    # Ensure that filename is set to the local directory.
    filename="${foldername}.tgz"
    echo "Downloading $filename (7 GB tar file)"
    wget $download_url -O "${filename}"
fi

# Extract the file to the working directory.
# untar the file and move directory to fix
echo "Extracting ${filename}"
tar -zxvf $filename -C "$PWD"
mkdir -p fix
mv $foldername/fix/* fix/.
rm -rf $foldername

echo "Completed."