use -xdev and not -mount for linux find as it works for busybox and -mount is deprecated

add latest functions to btrbk library

modules/filesystem/btrfs/btrbk.lib

@@ -49,6 +49,55 @@ dests+=" $(sudo btrbk -c $file list target  --format col:h:target_path)"
 echo $dests
 }
 
+btrbk_latest() {
+
+local file=$(btrbk_conf $1)    
+[[ ! $file ]] && echo unable to find conf file for ${1:-btrbk.conf} && return 1
+shift
+
+local latest=$(sudo btrbk -c $file list latest --format col:h:snapshot_subvolume | xargs -I % sh -c 'basename %' | sed '$!N; /^\(.*\)\n\1$/!P; D')
+echo $latest
+
+}
+
+btrbk_latest_snap () {
+
+local dry_run="echo"
+[[ $1 == "-e" ]] && dry_run="" && shift 
+
+local file=$(btrbk_conf $1)    
+[[ ! $file ]] && echo unable to find conf file for ${1:-btrbk.conf} && return 1
+shift
+
+local ext=${1-sav}.$(date "+%Y%m%d")
+
+local latest=$(sudo btrbk -c $file list latest --format col:h:snapshot_subvolume | xargs -I % sh -c 'basename %' | sed '$!N; /^\(.*\)\n\1$/!P; D')
+[[ ( ! $latest ) || $latest == "-" ]] && echo "no latest snapshots so can't make .latest links" && return 3
+local dests=$(btrbk_dests $file)
+
+if [[ $dry_run ]]; then
+ echo dry run for latest snapshots for following destinations, NOTE: use -e to actually make them
+ echo $dests
+ echo "-------------------"
+fi
+
+echo making snapshots in each destination 
+[[ $dry_run ]] && echo this is a dry run use -e to make snapshots 
+for dest in $dests; do
+for snap in $latest; do
+# [[ -e $dest/${snap%%.*}.latest ]] && $dry_run_echo sudo rm $dest/${snap%%.*}.latest
+# TODO only do latest links for locally mounted
+if [[ -d $dest/$snap ]]; then
+local cmd="sudo btrfs subvolume snapshot $dest/$snap $dest/${snap%%.*}.${ext}"
+echo $cmd 
+[[ ! $dry_run ]] && $cmd 
+fi
+done
+done
+
+}
+
+
 btrbk_latest_links () {
 
 local dry_run="echo"
@@ -58,6 +107,8 @@ local file=$(btrbk_conf $1)
 [[ ! $file ]] && echo unable to find conf file for ${1:-btrbk.conf} && return 1
 shift
 
+local ext=${2:-latest}
+
 local latest=$(sudo btrbk -c $file list latest --format col:h:snapshot_subvolume | xargs -I % sh -c 'basename %' | sed '$!N; /^\(.*\)\n\1$/!P; D')
 [[ ( ! $latest ) || $latest == "-" ]] && echo "no latest snapshots so can't make .latest links" && return 3
 local dests=$(btrbk_dests $file)
@@ -74,7 +125,7 @@ for snap in $latest; do
 # [[ -e $dest/${snap%%.*}.latest ]] && $dry_run_echo sudo rm $dest/${snap%%.*}.latest
 # TODO only do latest links for locally mounted
 if [[ -d $dest/$snap ]]; then
-local cmd="sudo ln -srfn  $dest/$snap $dest/${snap%%.*}.latest 2> /dev/null"
+local cmd="sudo ln -srfn  $dest/$snap $dest/${snap%%.*}.${ext}"
 echo $cmd 
 [[ ! $dry_run ]] && $cmd 
 fi

modules/utility/find.lib

@@ -30,7 +30,8 @@ local raw
 local mounted
 local usesudo
 
-mounted="-mount"
+# xdev is supported in busybox (alpine)
+mounted="-xdev"
 
 declare OPTION
 declare OPTARG