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#!/bin/sh
if [[ -z "$1" || -z "$2" || -z "$3" ]] ; then
echo "usage: $0 <ssh_remote> <remote_zfs_object> <local_zfs_object>" >&2
exit 1
fi
timestamp () {
t="`echo \"$1\" |sed -ne 's/^.*@zb-//p' |tr 'p_' '+ '`"
[[ -z "$t" ]] && return 1
date --date="$t" +%s
return $?
}
ssh_remote="$1"
remote_zfs="$2"
local_zfs="$3"
# find newest available and newest common snapshot
newest="N/A"
newest_common="N/A"
ssh $ssh_remote "zfs list -t snapshot -r -d 1 -H \"${remote_zfs}\" " | while read l ; do
#link unix timestamps
unixtime=`timestamp "$l"` || continue
echo "$unixtime" "$l"
done | sort -n | while read l ; do
curtime=${l%% *}
snapname=${l#* }
newest="$snapname"
if zfs list -t snapshot -H "${local_zfs}@zb-${snapname}" >/dev/null ; then
newest_common="$snapname"
fi
done
# some checks
if [ "$newest" = "N/A" ] ; then
echo "$0: no remote snapshots available to pull" >&2
exit 2
fi
if [ "$newest" = "$newest_common" ] ; then
echo "$0: nothing new to pull" >&2
exit 0
fi
if [ "$newest_common" = "N/A" ] ; then
#do a full send
ssh $ssh_remote "zfs send \"${remote_zfs}@zb-${newest}\"" | zfs recv -F "${local_zfs}"
exit $?
else
#do incremental send
ssh $ssh_remote "zfs send -I \"${remote_zfs}@zb-${newest_common}\" \"${remote_zfs}@zb-${$newest}\"" | zfs recv -F "${local_zfs}"
exit $?
fi
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