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 if [[ ! $@ ]]; then
  11     echo "$0: error: expected mountpoint argument"
  12 fi
  13
  14 ret=0
  15 for d; do
  16     vol=${d##*/}
  17     cd /mnt/root/btrbk
  18     snaps=($vol.20*)
  19     if [[ ! $snaps ]]; then
  20         # no snapshots yet
  21         continue
  22     fi
  23     # when a btrbk bugfix makes it into the distro,
  24     # we might replace this with btrbk list latest /mnt/root/$vol | ...
  25     # note: this is duplicated in mount-latest-subvol
  26     last_snap=$(
  27         for f in ${snaps[@]}; do
  28             printf "%s %s\n" $(date -d $(sed -r  's/(.{4})(..)(.{5})(..)(.*)/\1-\2-\3:\4:\5/' <<<${f#$vol.}) +%s) $f
  29         done | sort -r | head -n 1 | awk '{print $2}'
  30              )
  31     if [[ ! $last_snap ]]; then
  32         echo "$d stale"
  33         ret=1
  34         continue
  35     fi
  36     stale=true
  37     if btrfs sub show $d|sed '0,/^\t*Snapshot(s):/d;s/^\s*//' | \
  38             grep -xF btrbk/$last_snap &>/dev/null; then
  39         stale=false
  40     else
  41         last_uuid=$(btrfs sub show $last_snap| awk '$1 == "UUID:" {print $2}')
  42         if btrfs sub show $d| grep "^\s*Parent UUID:\s*$last_uuid$" &>/dev/null; then
  43             stale=false
  44         fi
  45     fi
  46     stale_dir=/nocow/btrfs-stale
  47     stale_file=$stale_dir/$vol
  48     if $stale; then
  49         mkdir -p $stale_dir
  50         printf "%s\n" $last_snap > $stale_file
  51         echo "$d stale"
  52         ret=1
  53         continue
  54     else
  55         rm -f $stale_file
  56     fi
  57 done
  58 exit $ret
  59