#!/bin/bash

## Simple logrotate script
## http://superglue.it | Danja Vasiliev, 2014
##
## Takes filepath(s) as argument:
## logrotate /www/access.log [/www/error.log] [/www/admin/admin.log]

## default settings, redefine in config file mentioned below 
ROTATE=30  ## backlogs to keep
DATE=$(date +%d.%m.%y-%H:%M:%S)
LOGS=( $* )

## source config
CONF='/etc/logrotate.conf'
[[ -e $CONF ]] && . $CONF

function err {
  printf %s": "%s"\n" "$(basename $0)" "$1"; exit 1
}

[[ -z $LOGS ]] && err 'missing input file'
[[ ! -e $LOGS ]] && err 'input file not readable'

for FILE in ${LOGS[@]}; do
  ## get number of backlogs and purge unwanted
  N=( $(ls -1 -r $FILE*.gz &>/dev/null || echo '') ) 
  [[ ${#N[@]} -gt $((ROTATE-1)) ]] && rm -f ${N[@]:$((ROTATE-1)) }
  ## compress and move
  gzip -f $FILE || err 'failed to gzip file'
  mv $FILE.gz "$FILE""$DATE".gz || err 'failed to rename archive'
done

exit 0