Allow to export license files from RPMs

licenses.sh

#!/usr/bin/env bash
# RPM license exporter
# Copyright 2022 [email protected]

extract_file() {
#  echo "$1"
#  echo "$2"
  rpm2cpio "$1" | cpio -iv --to-stdout ".$2" 1> license.tmp 2> /dev/null
  ENCODING=$(uchardet license.tmp)
#  echo "$ENCODING"
  if [[ "$ENCODING" == "unknown" ]]; then
    echo "UNKNOWN ENCODING: $1 - $2"
    return;
  fi

  echo "$2" >> licenses.tmp
  if [[ "$ENCODING" == "UTF-8" ]]; then
    cat license.tmp >> licenses.tmp
  else
    iconv -f "$ENCODING" -t UTF-8 license.tmp >> licenses.tmp
  fi
  echo "" >> licenses.tmp
}

rm -f licenses.txt
for fileName in *.rpm; do
  echo "$fileName"
  rm -f licenses.tmp
  NO_LIC=true
  FILES=$(rpm -qlp "$fileName")
  HAS_LIC=false
  for lic in `grep -i "/usr/share/licenses/.*/" <<< "${FILES[*]}"`; do
    extract_file "$fileName" "$lic"
    HAS_LIC=true
    NO_LIC=false
  done
  if ! $HAS_LIC; then
    for lic in `grep -i "licens\|copy" <<< "${FILES[*]}"`; do
      extract_file "$fileName" "$lic"
      NO_LIC=false
    done
  fi

  if $NO_LIC; then
    echo "NO LICENSE: $fileName"
  else
    (echo "$fileName"; cat licenses.tmp; echo ""; echo "") >> licenses.txt
  fi
done