zfs-sync-xz-pull

#!/bin/sh

if [ -z "${4}" ]; then
    echo "Usage: $0  dataset  remote_server:remote_port  pool  output_folder"
    exit 1
fi

#DRYRUN="-n"

DATASET="${1}"

if [ "x-" = "x${2}" ]; then
    REMOTE_CONNECTION=""
else
    if echo "${2}" | grep ':' >/dev/null 2>&1 ; then
        REMOTE_HOST=$( echo "${2}" | cut -f1 -d: )
        REMOTE_PORT=$( echo "${2}" | cut -f2 -d: )
    else
        REMOTE_HOST="${2}"
        REMOTE_PORT=22
    fi
    REMOTE_CONNECTION="ssh -p ${REMOTE_PORT} ${REMOTE_HOST}"
fi

RECVPOOL="${3}"

OUTPUTDIR="${4}"

# pattern to find when using rsync
SAFENAME=$( echo $DATASET | tr -c '[:alnum:]' _ )

if [ ! -d /${DATASET}/.zfs/snapshot/ ]; then
    echo "ERROR: ${DATASET} not mounted."
    if [ -e /usr/local/www/data/.snapshot.${SAFENAME}.json ]; then
        rm  /usr/local/www/data/.snapshot.${SAFENAME}.json
        stat-json-urep
    fi
    exit 1
fi

# ALGORITHM: local_last_snapshot
STARTAT=$( ls /${DATASET}/.zfs/snapshot/ | tail -1 )
# ALGORITHM: ssh remote remote_last_snapshot
ENDAT=$( $REMOTE_CONNECTION "ls /${DATASET}/.zfs/snapshot/" | grep -A999 ${STARTAT} | tail -1 )

if [  -e /usr/local/www/data ]; then
    cat >/usr/local/www/data/.snapshot.${SAFENAME}.json <<EOF
{"name":"${DATASET}","local":"${STARTAT}","remote":"${ENDAT}"},
EOF
    stat-json-urep
fi

if [ "$STARTAT" = "$ENDAT" ]; then
    echo "local $STARTAT = remote $ENDAT"
else
    # ALGORITHM: if file exists in output dir, then we weren't done rsync and import, skip the multi-export
    if ! ls ${OUTPUTDIR} | grep "${SAFENAME}" >/dev/null 2>&1 ; then
        # ALGORITHM: ssh remote zfs-xz-multi-export local_last_snapshot to remote_last_snapshot
        # limit to 5 so we don't run out of room
        $REMOTE_CONNECTION "zfs-xz-multi-export  ${DATASET}@${STARTAT}  ${OUTPUTDIR}  5"
    fi

    # ALGORITHM: zfs-xz-rsync-pull
    zfs-xz-rsync-pull  ${2}  ${OUTPUTDIR}  ${SAFENAME}

    # ALGORITHM: zfs-xz-multi-import /scratch/urep tank
    echo "zfs rollback ${DATASET}@${STARTAT}"
          zfs rollback ${DATASET}@${STARTAT}
    echo "zfs-xz-multi-import  ${OUTPUTDIR}  ${RECVPOOL}  ${SAFENAME}"
          zfs-xz-multi-import  ${OUTPUTDIR}  ${RECVPOOL}  ${SAFENAME}
fi

if [  -e /usr/local/www/data ]; then
    STARTAT=$( ls /${DATASET}/.zfs/snapshot/ | tail -1 )
    cat >/usr/local/www/data/.snapshot.${SAFENAME}.json <<EOF
{"name":"${DATASET}","local":"${STARTAT}","remote":"${ENDAT}"},
EOF
    stat-json-urep
fi