guix-package-manager-tutorials/make-a-package/look-at-log.bash

#!/usr/bin/env bash

set -Eeuxo pipefail

# current script directory
DIR="$(cd "$(dirname "$0")" > /dev/null 2>&1; pwd -P)"
printf "script directory: %s\n" "${DIR}"

if [ -z ${1+x} ]; then
    printf "%s\n" "No log file specified.";
    exit 1;
else
    printf "%s %s %s\n" '${1}' 'is set to' "${1}";
    COMPRESSED_LOG_FILE="${1}"
fi

COMPRESSED_FILE_NAME="$(basename -- ${COMPRESSED_LOG_FILE})"
# DECOMPRESSED_FILE_NAME=$(echo "${COMPRESSED_FILE_NAME}" | rev | cut --fields '2-' --delimiter '.' | rev)
DECOMPRESSED_FILE_NAME="${COMPRESSED_FILE_NAME%.*}"

cp --verbose "${COMPRESSED_LOG_FILE}" "${DIR}/${COMPRESSED_FILE_NAME}"
# z8qdlxa1c3bjdcx91p200vgxdkwfyg-python-jupyterlab-server-2.0.0rc1.drv.bz2 ->
# z8qdlxa1c3bjdcx91p200vgxdkwfyg-python-jupyterlab-server-2.0.0rc1.drv
bzip2 --decompress "${COMPRESSED_FILE_NAME}"

cat "${DECOMPRESSED_FILE_NAME}"
rm --verbose "${DECOMPRESSED_FILE_NAME}"