iankelling.org Git - distro-setup/blob - unison-snapshot

   1 #!/bin/bash -l
   2 set -eE -o pipefail
   3 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
   4
   5 sv() { echo "$@"; "$@"; }
   6
   7 date=unison-$(date "+%Y:%m:%d")
   8 for mountp in /mnt/root/q /mnt/iroot/i; do
   9     [[ -e $mountp ]] || continue
  10     date_path=${mountp%/*}/$date
  11     todays=( $date_path-* )
  12     IFS=$'\n' todays=($(sort -Vr <<<"${todays[*]}")); unset IFS
  13     if [[ -e ${todays[0]} ]]; then
  14         snapshot=$date_path-$(( ${todays[0]##*-} + 1 ))
  15     else
  16         snapshot=$date_path-1
  17     fi
  18     sv s btrfs subvolume snapshot -r $mountp $snapshot
  19     existing=( ${mountp%/*}/unison-* )
  20     IFS=$'\n' existing=($(sort -Vr <<<"${existing[*]}")); unset IFS
  21     # keep 10 unison snapshots around
  22     if (( ${#existing[@]} > 10 )); then
  23         sv s btrfs subvolume delete ${existing[@]:10}
  24     fi
  25 done