#!/bin/sh

# Purpose :
# Create an XZ archive of all files between 2 dates.
# Then remove these files

# Call this script from an /var/lib/xymon/hostdata subdirectory or
# /var/lib/xymon/histlogs subdirectory.

# Vars {{{
## Enable (0) or disable (1) debug
debug=0

## Colors {{{
c_redb='\033[1;31m'
c_magentab='\033[1;35m'
c_reset='\033[0m'
## }}}

## Manage files of year
date_year="2019"

## Compress files between these dates
date_start="${date_year}-01-01 00:00:01"
date_end="${date_year}-12-31 23:59:59"

## Best XZ compression level
xz_compression_lvl="-9"
## Fatest XZ compression level
#xz_compression_lvl="-0"

## Get current directory name
current_dir=${PWD##*/}

## Count the number of files
match_files=$(find . -type f -newermt "${date_start}" -not -newermt "${date_end}" -not -iname "*.tar*" | wc -l)

## Archive name
tar_file_name="${date_year}.${current_dir}${xz_compression_lvl}.tar.xz"

# }}}

# If archive already exists
if [ -s "${tar_file_name}" ]; then
	printf "${c_redb}%-6b${c_reset}\n" "ERROR : ${tar_file_name} already exists (also ${match_files} files match the expected pattern). Please manage this directory manually or remove the archive or files then restart."
	exit 1
fi

# If some files match
if [ ! ${match_files} -eq "0" ]; then
	[ "${debug}" -eq "0" ] && printf "${c_magentab}%-6b${c_reset}\n" "DEBUG : Create an archive for ${current_dir} files between ${date_start} and ${date_end} (${match_files} files) using XZ's compression level : ${xz_compression_lvl}."

	## Get the list of files between the 2 dates and ignore tar files
	find . -type f -newermt "${date_start}" -not -newermt "${date_end}" -not -iname "*.tar*" -print0 | tar cJf "${tar_file_name}" --null -T -

	## Check previous return code and if the archive exists with size > 0
	if [ "${?}" -eq "0" ] && [ -s "${tar_file_name}" ]; then
		[ "${debug}" -eq "0" ] && printf "${c_magentab}%-6b${c_reset}\n" "DEBUG : ${tar_file_name} successfully created, the files can be deleted."
		find . -type f -newermt "${date_start}" -not -newermt "${date_end}" -not -iname "*.tar*" -delete
	fi
else
	[ "${debug}" -eq "0" ] && printf "${c_magentab}%-6b${c_reset}\n" "DEBUG : Skip ${current_dir}, no files found between ${date_start} and ${date_end}."
fi

exit 0