clean_tarsnap.sh

gistfile1.txt

#!/usr/bin/env bash
# remove old tarsnap archives

# Copyright (c) 2015-2017 Jason W Ryan
# The MIT License (MIT) http://opensource.org/licenses/MIT

# number of archives to retain
keep=6
machine=$(hostname)

red=$'\e[1;31m'
yel=$'\e[1;33m'
cyn=$'\e[1;36m'
end=$'\e[0m'
tmpfile=$(mktemp -t tarsnap.XXXXXX)

trap "rm '${tmpfile}'" EXIT INT TERM

# must be run as root
if (( EUID != 0 )); then
  printf "%s\n" "You must be root to run this."
  exit 1
fi

# generate list
tarsnap --list-archives > "$tmpfile"

# sort by descending date, format is: ddmmyy_hh:mm
{
  rm "$tmpfile" && cut -d- -f2,3,4,5,6 | sort  > "$tmpfile"
} < "$tmpfile"

# populate the list
mapfile -t archives < "$tmpfile"

# print the full list
printf "${cyn}%s${end}\n" "Current archives:"
printf "%s\n" "${archives[@]}"

# identify oldest archives
remove=$(( ${#archives[@]} - keep ))
if (( remove > 0 )); then
  mapfile -t -n "$remove" targets < "$tmpfile"
else
  unset targets
fi

# if there is at least one to remove
if (( ${#targets[@]} >= 1 )); then
  printf "${red}%s${end}\n" "Archives to delete:"
  printf "%s\n" "${targets[@]}"

  read -p "Proceed with deletion? [${red}Y${end}/N] " YN

  if [[ ${YN^^} == "Y" ]]; then
    for archive in "${targets[@]}"; do
      tarsnap -d --no-print-stats -f "${machine,}-${archive}"
    done && printf "${yel}%s${end}\n" "Archives successfully deleted..."

    printf "\n${cyn}%s${end}\n" "Remaining archives:"
    tarsnap --list-archives
  else
    printf "${yel}%s${end}\n" "Operation aborted"
  fi
else
  printf "\n%s\n" "Nothing to do"
  exit 0
fi

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