iankelling.org Git - distro-setup/blob - mail-backup-clean

   1 #!/bin/bash
   2 # I, Ian Kelling, follow the GNU license recommendations at
   3 # https://www.gnu.org/licenses/license-recommendations.en.html. They
   4 # recommend that small programs, < 300 lines, be licensed under the
   5 # Apache License 2.0. This file contains or is part of one or more small
   6 # programs. If a small program grows beyond 300 lines, I plan to switch
   7 # its license to GPL.
   8
   9 # Copyright 2024 Ian Kelling
  10
  11 # Licensed under the Apache License, Version 2.0 (the "License");
  12 # you may not use this file except in compliance with the License.
  13 # You may obtain a copy of the License at
  14
  15 #     http://www.apache.org/licenses/LICENSE-2.0
  16
  17 # Unless required by applicable law or agreed to in writing, software
  18 # distributed under the License is distributed on an "AS IS" BASIS,
  19 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  20 # See the License for the specific language governing permissions and
  21 # limitations under the License.
  22
  23
  24 if ! test "$BASH_VERSION"; then echo "error: shell is not bash" >&2; exit 1; fi
  25 shopt -s inherit_errexit 2>/dev/null ||: # ignore fail in bash < 4.4
  26 set -eE -o pipefail
  27 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" exit status: $?, PIPESTATUS: ${PIPESTATUS[*]}" >&2' ERR
  28
  29 ## This would delete backups that we already have in snapshots,
  30 ## 1 second granularity, so we could have some duplicates. However,
  31 ## this doesn't account for files received then accidentally deleted,
  32 ## all in between two snapshots, so they aren't in any snapshot.
  33 ## So, instead, just keep a bunch of backups based on time.
  34
  35 # cd /mnt/o/btrbk
  36 # tmp=(o*)
  37 # last_snap_date=${tmp[-1]#o.}
  38 # time=$(( $(date -d $(sed -r  's/(.{4})(..)(.{5})(..)(.*)/\1-\2-\3:\4:\5/' <<<$last_snap_date) +%s) -1 ))
  39 # find /bu/md -type f \! -newermt @$time -delete
  40
  41 if [[ ! -d /bu/md ]]; then
  42   exit 0
  43 fi
  44
  45 find /bu/md -type f -mtime +100 -delete