iankelling.org Git - distro-setup/blob - btrbkr2

   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 source /a/bin/bash-bear-trap/bash-bear
  25
  26 [[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"
  27
  28 usage() {
  29   cat <<EOF
  30 Usage: ${0##*/} TARGET_HOST
  31 Send btrbk for root2
  32
  33
  34 -h|--help  Print help and exit.
  35
  36 Note: Uses util-linux getopt option parsing: spaces between args and
  37 options, short options can be combined, options before args.
  38 EOF
  39   exit $1
  40 }
  41
  42 ##### begin command line parsing ########
  43
  44 # ensure we can handle args with spaces or empty.
  45 ret=0; getopt -T || ret=$?
  46 [[ $ret == 4 ]] || { echo "Install util-linux for enhanced getopt" >&2; exit 1; }
  47
  48 temp=$(getopt -l help h "$@") || usage 1
  49 eval set -- "$temp"
  50 while true; do
  51   case $1 in
  52     -h|--help) usage ;;
  53     --) shift; break ;;
  54     *) echo "$0: unexpected args: $*" >&2 ; usage 1 ;;
  55   esac
  56   shift
  57 done
  58
  59 read -r target <<<"$@"
  60
  61 if [[ ! $target ]]; then
  62   echo $0: error: specify target
  63   exit 1
  64 fi
  65
  66 cat >/etc/btrbk/root2.conf <<EOF
  67
  68 ssh_identity /root/.ssh/home
  69 # Just a guess that local7 is a good facility to pick.
  70 # It's a bit odd that the transaction log has to be logged to
  71 # a file or syslog, while other output is sent to std out.
  72 # The man does not mention a way for them to be together, but
  73 # I dunno if setting a log level like warn might also output
  74 # transaction info.
  75 transaction_syslog local7
  76
  77 # trying this out
  78 stream_compress zstd
  79
  80 archive_preserve_min latest
  81
  82 # so we only run one at a time
  83 lockfile   /var/lock/btrbkroot2.lock
  84
  85 # default format of short does not accomidate hourly preservation setting
  86 timestamp_format long-iso
  87
  88 # dont make new snapshot, we only receive new snapshots
  89 snapshot_create no
  90
  91 # if something fails and it's not obvious, try doing
  92 # btrbk -l debug -v dryrun
  93
  94 rate_limit no
  95 volume /mnt/r7/amy
  96 subvolume root_ubuntubionic
  97 target send-receive ssh://$target/mnt/root2/btrbk
  98 volume /mnt/r7/amy
  99 subvolume boot_ubuntubionic
 100 target send-receive ssh://$target/mnt/boot2/btrbk
 101
 102 EOF
 103
 104 tmpconf=$(mktemp -d)/b.conf
 105
 106 timeout -s 9 6 ssh root@$target mkdir -p /mnt/{b,r}oot2/btrbk
 107
 108 exclude=root
 109 for base in boot root; do
 110   cat - /etc/btrbk/root2.conf >$tmpconf <<<"archive_exclude ${exclude}_ubuntubionic"
 111   btrbk -c $tmpconf archive /mnt/r7/amy/btrbk ssh://$target/mnt/${base}2/btrbk
 112   # swaps the vars
 113   exclude=$base
 114 done