#!/bin/bash

## Simple logrotate script
## http://superglue.it | Danja Vasiliev, 2014
##
## Takes filepath as argument

## backlogs to keep
_ROTATE=7
_DATE=$(date +%d.%m.%y-%H:%M:%S)
_FILE=$1

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

[[ -z $1 ]] && err 'missing input file'
[[ ! -e $1 ]] && err 'input file not readable'

## get number of backlogs and purge unwanted
_N=( $(ls -1 -r $_FILE*.gz) ) 
[[ ${#_N[@]} -gt $((_ROTATE-1)) ]] && rm -f ${_N[@]:$((_ROTATE-1)) }

gzip -f $_FILE || err 'failed to gzip file'
mv $_FILE.gz "$_FILE"_"$_DATE".gz || err 'failed to rename archive'

exit 0