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

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