getRLN -- get (R)EADME, (L)ICENSE, (N)OTICE files from a source tree

getrln.sh

#!/bin/bash

# getrln.sh v 18.03.1
#
# Copyright (c) 2018 Peeter P. Mõtsküla <peeterpaul@motskula.net>
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.


function usage {
  cat <<.
Usage: getrln.sh BUILDROOT
Try 'getrln.sh -h' for help.
.
}


function showhelp {
  cat <<.
getRLN -- get (R)EADME, (L)ICENSE, (N)OTICE files from a source tree

getrln.sh extracts "README*", "LICENSE*", "COPYING*", and "NOTICE*" files
from any libraries in the BUILDROOT directory into ./BUILDROOT.rln.

The script is likely to fail when BUILDROOT is set to the current directory
or any of its parent directories.
BUILDROOT values ".", "..", and "/" are caught.

Any .jar files found in/under BUILDROOT will be temporarily unpacked into
./BUILDROOT-jars.rln. There are no checks if there is enough disk space.

.
}


function main {

  # check command-line arguments
  if [[ $# == 0 ]] ; then usage ; exit ; fi
  if [[ $1 == -h ]] ; then showhelp ; exit ; fi
  if [[ $1 == . || $1 == .. || $1 =~ ^/$ ]] ; then echo "Invalid BUILDROOT." ; echo ; showhelp; exit ; fi
  BUILDROOT=$1
  if [[ $BUILDROOT =~ /$ ]] ; then BUILDROOT="${BUILDROOT%/}" ; fi
  if [[ $BUILDROOT =~ / ]] ; then SHORTROOT="${BUILDROOT##*/}" ; else SHORTROOT="$BUILDROOT" ; fi
  export BUILDROOT SHORTROOT

  # unzip jars
  find "$BUILDROOT" -name '*.jar' -exec bash -c 'i="{}" ; j=${i#"$BUILDROOT/"} ; j="$SHORTROOT-jars.rln/$j" ; mkdir -p "$j" ; unzip -q "$i" -d "$j"' \;

  # export RLN files
  find "$BUILDROOT" \( -name 'README*' -o -name 'LICENSE*' -o -name 'COPYING*' -o -name 'NOTICE*' \) -exec bash -c 'i={} ; j=${i/"$BUILDROOT"/"$SHORTROOT.rln"} ; j="${j%/*}" ; mkdir -p "$j" ; cp "$i" "$j"' \;
  find "$SHORTROOT-jars.rln" \( -name 'README*' -o -name 'LICENSE*' -o -name 'COPYING*' -o -name 'NOTICE*' \) -exec bash -c 'i={} ; j=${i/"$SHORTROOT-jars.rln"/"$SHORTROOT.rln"} ; j="${j%/*}" ; mkdir -p "$j" ; cp "$i" "$j"' \;

  # delete unzipped jars
  rm -rf "$SHORTROOT-jars.rln"

  # delete ._ files created by Mac OS Finder
  find "$SHORTROOT.rln" -type f -name '._*' -exec rm {} \;

  # list the files found
  find "$SHORTROOT.rln" -type f

}

main $@