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#!/bin/sh
base=/a/cache
zbase=a/cache
fs=$1
rsnap=$(zclient list | grep "^$fs " | tail -1 | awk '{print $2}')
if [ -z "$rsnap" ]; then
echo "No such filesystem $fs"
exit 1
fi
lsnap=$(zfs list -Ht snapshot | grep "^$zbase/$fs@" | tail -1 | sed -e "s,^$zbase/$fs@,," | awk '{print $1}')
if [ -z "$lsnap" ]; then
echo "No local snapshot found"
dofull=1
else
if [ "$lsnap" = "$rsnap" ]; then
exit 0
fi
# Check for remotve snapshot
if ! (zclient list | grep "^$fs $lsnap " > /dev/null); then
echo "Local snapshot not found, removing and resyncing"
zfs destroy $zbase/$fs@$lsnap
dofull=0
else
dofull=1
fi
fi
if [ "$dofull" = "1" ]; then
zfs destroy -r ${zbase}/${fs}
zclient get ${fs} ${rsnap} | zcat | zfs receive ${zbase}/${fs}
else
zclient diff ${fs} ${lsnap} ${rsnap} | zcat | zfs receive -F ${zbase}/${fs}
fi
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