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

   1 #!/bin/bash
   2 # Copyright (C) 2019 Ian Kelling
   3 # SPDX-License-Identifier: AGPL-3.0-or-later
   4 # SPDX-License-Identifier: GPL-3.0-or-later
   5 # SPDX-License-Identifier: Apache-2.0
   6
   7 if ! test "$BASH_VERSION"; then echo "error: shell is not bash" >&2; exit 1; fi
   8 shopt -s inherit_errexit 2>/dev/null ||: # ignore fail in bash < 4.4
   9 set -eE -o pipefail
  10 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" exit status: $?, PIPESTATUS: ${PIPESTATUS[*]}" >&2' ERR
  11 # alternatively, using https://iankelling.org/git/?p=errhandle;a=tree
  12 # source /path/errhandle/err
  13 # on my machine
  14 source /a/bin/errhandle/err
  15
  16 [[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"
  17
  18 usage() {
  19   cat <<EOF
  20 Usage: ${0##*/} TARGET_HOST
  21 Send btrbk for root2
  22
  23
  24 -h|--help  Print help and exit.
  25
  26 Note: Uses util-linux getopt option parsing: spaces between args and
  27 options, short options can be combined, options before args.
  28 EOF
  29   exit $1
  30 }
  31
  32 ##### begin command line parsing ########
  33
  34 # ensure we can handle args with spaces or empty.
  35 ret=0; getopt -T || ret=$?
  36 [[ $ret == 4 ]] || { echo "Install util-linux for enhanced getopt" >&2; exit 1; }
  37
  38 temp=$(getopt -l help h "$@") || usage 1
  39 eval set -- "$temp"
  40 while true; do
  41   case $1 in
  42     -h|--help) usage ;;
  43     --) shift; break ;;
  44     *) echo "$0: unexpected args: $*" >&2 ; usage 1 ;;
  45   esac
  46   shift
  47 done
  48
  49 read -r target <<<"$@"
  50
  51 if [[ ! $target ]]; then
  52   echo $0: error: specify target
  53   exit 1
  54 fi
  55
  56 cat >/etc/btrbk/root2.conf <<EOF
  57
  58 ssh_identity /root/.ssh/home
  59 # Just a guess that local7 is a good facility to pick.
  60 # It's a bit odd that the transaction log has to be logged to
  61 # a file or syslog, while other output is sent to std out.
  62 # The man does not mention a way for them to be together, but
  63 # I dunno if setting a log level like warn might also output
  64 # transaction info.
  65 transaction_syslog local7
  66
  67 # trying this out
  68 stream_compress zstd
  69
  70 archive_preserve_min latest
  71
  72 # so we only run one at a time
  73 lockfile   /var/lock/btrbkroot2.lock
  74
  75 # default format of short does not accomidate hourly preservation setting
  76 timestamp_format long-iso
  77
  78 # dont make new snapshot, we only receive new snapshots
  79 snapshot_create no
  80
  81 # if something fails and it's not obvious, try doing
  82 # btrbk -l debug -v dryrun
  83
  84 rate_limit no
  85 volume /mnt/r7/amy
  86 subvolume root_ubuntubionic
  87 target send-receive ssh://$target/mnt/root2/btrbk
  88 volume /mnt/r7/amy
  89 subvolume boot_ubuntubionic
  90 target send-receive ssh://$target/mnt/boot2/btrbk
  91
  92 EOF
  93
  94 tmpconf=$(mktemp -d)/b.conf
  95
  96 timeout -s 9 6 ssh root@$target mkdir -p /mnt/{b,r}oot2/btrbk
  97
  98 exclude=root
  99 for base in boot root; do
 100   cat - /etc/btrbk/root2.conf >$tmpconf <<<"archive_exclude ${exclude}_ubuntubionic"
 101   btrbk -c $tmpconf archive /mnt/r7/amy/btrbk ssh://$target/mnt/${base}2/btrbk
 102   # swaps the vars
 103   exclude=$base
 104 done