d subvol_dir=$subvol_dir
# note, we need $dev because $d might not be mounted, and we do this loop
# because the device in fstab for the rootfs can be different.
- for devx in $(btrfs fi show $dev| sed -rn 's#.*path (/\S+)$#\1#p'); do
+ for devx in $(btrfs fil show $dev| sed -rn 's#.*path (/\S+)$#\1#p'); do
d devx=$devx
root_dir=$(sed -rn "s,^\s*$devx\s+(\S+).*\bsubvolid=[05]\b.*,\1,p" /etc/mtab /etc/fstab|head -n1)
if [[ $root_dir ]]; then
d "svp=$svp # subvolume path"
snaps=($root_dir/btrbk/$subvol_dir.20*) # Assumes we are in the 21st century.
- if [[ ! $snaps ]]; then
+ if [[ ! ${snaps[@]} ]]; then
# no snapshots yet
echo "$0: warning: no snapshots found at $root_dir/btrbk/$subvol_dir.20*. this is expected for a brand new volume"
continue