#!/bin/sh

# clean_pkg_logs-0.1 / clean /var/log/removed_packages & removed_scripts
#
# Copyright 2019 Stu Miller, Colorado, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# -----------------------------------------------------------------------------

if [ "$1" = "test" ] || [ "$1" = "remove" ]; then
  printf '%s\n' "" "Start cleanup - $1" ""
else
  printf '%s\n' "" "Script requires argument: test|remove" ""
  exit
fi

CLEAN_DIR=(/var/log/removed_packages /var/log/removed_scripts)
TMP_DIR="/tmp"

printf '%s\n' "Determine unique packages..." > $TMP_DIR/unique
printf '%s\n' "Determine packages to keep..." > $TMP_DIR/keep
printf '%s\n' "Determine packages to remove..." > $TMP_DIR/remove

for DIR in "${CLEAN_DIR[@]}"; do

  printf '%s\n' "" "$DIR" ""
  printf '%s\n' "" "$DIR" "" >> $TMP_DIR/unique
  printf '%s\n' "" "$DIR" "" >> $TMP_DIR/keep
  printf '%s\n' "" "$DIR" "" >> $TMP_DIR/remove

  UNIQUE=($(
    ls -1 --dereference-command-line-symlink-to-dir $DIR \
      | rev \
      | sed -e 's/.*68x-//g' -e 's/.*hcraon-//g' -e 's/.*68[3-6]i-//g' \
      | cut -d'-' -f2-9 \
      | rev \
      | uniq
  ))

  printf '%s\n' "unique package count: ${#UNIQUE[@]}"
  ARRAY_NAME="UNIQUE[@]"; printf '%s\n' "${!ARRAY_NAME}" >> $TMP_DIR/unique

  TOTAL=0; KEEP=0; REMOVE=0
  for ROW in "${UNIQUE[@]}"; do
    ARRAY=($(ls -t $DIR | grep -e "^$ROW-[0-9]"))
    for PKG in "${!ARRAY[@]}"; do
      if [ $PKG -eq 0 ] || [ $PKG -eq 1 ] && [ ${ARRAY[$PKG]} ]; then
        printf '%s\n' ${ARRAY[$PKG]} >> $TMP_DIR/keep
        ((KEEP++))
      else
        printf '%s\n' ${ARRAY[$PKG]} >> $TMP_DIR/remove
        [ "$1" = "remove" ] && rm $DIR/${ARRAY[$PKG]}
        ((REMOVE++))
      fi
      ((TOTAL++))
    done
  done
  printf '%s\n' "total package count: $TOTAL" \
    "keep package count: $KEEP" \
    "remove package count: $REMOVE"
done

printf '%s\n' "" "See /tmp for 3 log files (unique, keep & remove)" "Script complete!" ""