iankelling.org Git - distro-setup/blob - check-subvol-stale

   1 #!/bin/bash
   2
   3 [[ $EUID == 0 ]] || exec sudo -E "$BASH_SOURCE" "$@"
   4
   5 set -eE -o pipefail
   6 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
   7
   8 shopt -s nullglob
   9
  10 ret=0
  11 for d; do
  12     vol=${d##*/}
  13     cd /mnt/root/btrbk
  14     snaps=($vol.20*)
  15     if [[ ! $snaps ]]; then
  16         # no snapshots yet
  17         continue
  18     fi
  19     # when a btrbk bugfix makes it into the distro,
  20     # we might replace this with btrbk list latest /mnt/root/$vol | ...
  21     # note: this is duplicated in mount-latest-subvol
  22     last_snap=$(
  23         for f in ${snaps[@]}; do
  24             printf "%s %s\n" $(date -d $(sed -r  's/(.{4})(..)(.{5})(..)(.*)/\1-\2-\3:\4:\5/' <<<${f#$vol.}) +%s) $f
  25         done | sort -r | head -n 1 | awk '{print $2}'
  26              )
  27     if [[ ! $last_snap ]]; then
  28         echo "$d stale"
  29         ret=1
  30         continue
  31     fi
  32     stale=true
  33     if btrfs sub show $d|sed '0,/^\t*Snapshot(s):/d;s/^\s*//' | \
  34             grep -xF btrbk/$last_snap &>/dev/null; then
  35         stale=false
  36     else
  37         last_uuid=$(btrfs sub show $last_snap| awk '$1 == "UUID:" {print $2}')
  38         if btrfs sub show $d| grep "^\s*Parent UUID:\s*$last_uuid$" &>/dev/null; then
  39             stale=false
  40         fi
  41     fi
  42     stale_dir=/nocow/btrfs-stale
  43     stale_file=$stale_dir/$vol
  44     if $stale; then
  45         mkdir -p $stale_dir
  46         printf "%s\n" $last_snap > $stale_file
  47         echo "$d stale"
  48         ret=1
  49         continue
  50     else
  51         rm -f $stale_file
  52     fi
  53 done
  54 exit $ret
  55
  56 # todo: figure out what to do when there are no
  57 # snapshots yet. I guess that should be
  58 # yes to being stale? see the implications
  59 # in the other script.