iankelling.org Git - distro-setup/blob - btrbk-run

   1 #!/bin/bash -l
   2
   3 set -eE -o pipefail
   4 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
   5
   6 [[ $EUID == 0 ]] || exec sudo -E "$BASH_SOURCE" "$@"
   7
   8 conf_only=false
   9 if [[ $1 == -c ]]; then
  10     # mostly for testing
  11     conf_only=true
  12 fi
  13
  14 target_host=frodo
  15 cat >/etc/btrbk.conf <<'EOF'
  16 ssh_identity /root/.ssh/id_rsa
  17 transaction_syslog daemon
  18
  19 # so we only run one at a time
  20 lockfile                   /var/lock/btrbk.lock
  21
  22 # default format of short does not accomidate hourly preservation setting
  23 timestamp_format long-iso
  24 # background on timezones. with short/long, timestamps use local time.
  25 # for long, if your local time moves backwards, by moving timezones or
  26 # for an hour when daylight savings changes it, you will temporarily get
  27 # a more aggressive retention policy for the overlapping period, and
  28 # vice versa for the opposite timezone move. The alternative is using
  29 # long-iso, which puts timezone info into the timestamp, which means
  30 # that instead of shifting time, you shift the start of day/week/month
  31 # which is used for retention to your new local time, which means for
  32 # example, if you moved forward by 8 hours, the daily/weekly/monthly
  33 # retention will be 8 hours more aggressive since midnight is at a new
  34 # time, unless you fake the timzeone using the TZ env variable.
  35 # However, in the short term, there will be no inconsistencies.
  36 # I don't see any problem with shifting when the day starts for
  37 # retention, so I'm using long-iso.
  38
  39 # only make a snapshot if things have changed
  40 snapshot_create onchange
  41 # much less snapshots because I have less space on the
  42 # local filesystem.
  43 snapshot_preserve 2h 2d
  44
  45 # so, total backups = ~89
  46 target_preserve 48h 14d 8w 24m
  47 target_preserve_min 6h
  48
  49 # if something fails and it's not obvious, try doing
  50 # btrbk -l debug -v dryrun
  51 EOF
  52
  53
  54 case $HOSTNAME in
  55     tp|x2)
  56         if ! timeout -s 9 10 ssh frodo :; then
  57             target_host=$HOME_DOMAIN
  58             cat >>/etc/btrbk.conf <<EOF
  59 ssh_port 2222
  60 EOF
  61         fi
  62         ;;
  63 esac
  64
  65 if [[ $HOSTNAME != frodo ]]; then
  66     remote_target="target send-receive ssh://${target_host}/mnt/root/${HOSTNAME}-btrbk"
  67 fi
  68
  69 target-section() {
  70     root=$1
  71     subvol=$2
  72     mountpoint $root &>/dev/null || return
  73     cat >>/etc/btrbk.conf <<EOF
  74 volume $root
  75 subvolume $subvol
  76 $remote_target
  77
  78 EOF
  79 }
  80
  81 target-section /mnt/iroot i
  82 target-section /mnt/root q
  83
  84 if $conf_only; then
  85     exit
  86 fi
  87
  88 btrbk -q run