ssh_lvm_dump

#! /bin/sh

# usage: ssh_lvm_dump root@host lv_path

export BLOCKSIZE=1048576
SS_NAME="lvm_dump"

# check args
SSH_ARGS="$1"
LV_PATH="$2"
if [ ! "$LV_PATH" ] ; then
    echo "Usage: $0 root@host lv_path [5< prev_digest_file] 6> digest_file > backup_file" >&2
    exit 1
fi

# setup variables
SS_PATH=`dirname $LV_PATH`"/$SS_NAME"
SSH_BLOCKDIFF_DUMP=`dirname $0`
if [ "$SSH_BLOCKDIFF_DUMP" ] ; then
    SSH_BLOCKDIFF_DUMP="$SSH_BLOCKDIFF_DUMP/"
fi
SSH_BLOCKDIFF_DUMP="$SSH_BLOCKDIFF_DUMPssh_blockdiff_dump"
if [ ! "$SNAPSHOT_SIZE" ] ; then
    SNAPSHOT_SIZE="10G"
fi
EXIT_CODE=0

# create snapshot
if [ "$EXIT_CODE" -eq 0 ] ; then
    echo "creating snapshot..." >&2
    ssh $SSH_ARGS "lvcreate --snapshot -L \"$SNAPSHOT_SIZE\" -n \"$SS_NAME\" \"$LV_PATH\"" >&2
    EXIT_CODE=$?
fi

# dump
if [ "$EXIT_CODE" -eq 0 ] ; then
    $SSH_BLOCKDIFF_DUMP "$SSH_ARGS" "$SS_PATH"
    EXIT_CODE=$?
fi

# remove snapshot
echo "removing snapshot $SS_PATH..." >&2
ssh $SSH_ARGS "lvremove -f \"$SS_PATH\"" >&2
EXIT_CODE2=$?
if [ "$EXIT_CODE" -eq 0 ] ; then
    EXIT_CODE=$EXIT_CODE2
fi

exit $EXIT_CODE