freeze-dir.sh

   1 #!/bin/bash
   2
   3 #########################################################################
   4 # This program is free software: you can redistribute it and/or modify  #
   5 # it under the terms of the version 3 of the GNU General Public License #
   6 # as published by the Free Software Foundation.                         #
   7 #                                                                       #
   8 # This program is distributed in the hope that it will be useful, but   #
   9 # WITHOUT ANY WARRANTY; without even the implied warranty of            #
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      #
  11 # General Public License for more details.                              #
  12 #                                                                       #
  13 # You should have received a copy of the GNU General Public License     #
  14 # along with this program. If not, see <http://www.gnu.org/licenses/>.  #
  15 #                                                                       #
  16 # Written by and Copyright (C) Francois Fleuret                         #
  17 # Contact <francois@fleuret.org> for comments & bug reports             #
  18 #########################################################################
  19
  20 # This command makes a backup copy of a given directory into a backup
  21 # directory, tags it with the date and time, and uses rsync smart use
  22 # of hard links to avoid unnecessary duplicates of files already
  23 # backuped.
  24
  25 set -e
  26
  27 # The default directory does not start with a period, as it may be
  28 # huge and should not be "hidden" from the user.
  29
  30 [[ ${FREEZE_DIR} ]] || FREEZE_DIR=${HOME}/freezer
  31
  32 if [[ ! -d ${FREEZE_DIR} ]]; then
  33     echo "Can not find directory ${FREEZE_DIR}" >&2
  34     exit 1
  35 fi
  36
  37 while [[ "$1" ]]; do
  38     real_path="$(realpath "$1")"
  39     dir=$(basename "${real_path}")
  40     path=$(dirname "${real_path}")
  41     full_path="${path}/${dir}"
  42
  43     date=$(date +%Y_%b_%d_%H:%M:%S)
  44
  45     if [[ ! -d "${full_path}" ]]; then
  46         echo "Can not find directory ${full_path}" >&2
  47         exit 1
  48     fi
  49
  50     if [[ $(find "${full_path}" -type f -name "core*" -o -name "vgcore.[0-9]*") ]]; then
  51         # rm -i $(find "${full_path}" -type f -name "core" -o -name "vgcore.[0-9]*")
  52         echo "There seems to be core files in ${full_path}" >&2
  53         exit 1
  54     fi
  55
  56     backup="${FREEZE_DIR}/${full_path}"
  57
  58     mkdir -p "${FREEZE_DIR}/${path}"
  59
  60     current_backup="${backup}:::current"
  61     new_backup="${backup}:::${date}"
  62
  63     if [[ -h "${current_backup}" ]]; then
  64         rsync --progress --link-dest="${current_backup}/" -axz "${full_path}/" "${new_backup}/"
  65         rm "${current_backup}"
  66     else
  67         if [[ -a ${current_backup} ]]; then
  68             echo "${current_backup} exists and is not a symbolic link" >&2
  69             exit 1
  70         else
  71             rsync --progress -axz "${full_path}/" "${new_backup}/"
  72         fi
  73     fi
  74
  75     ln -vs "${new_backup}" "${current_backup}"
  76
  77     sync
  78
  79     du -sh "${new_backup}"
  80
  81     shift
  82
  83 done