Initialize with first draft.

.gitignore

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+datasets.txt
+rootzfs.txt
+hosts.txt
+user.txt

backup.sh

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+#!/usr/bin/env sh
+
+BAKRNG_ROOT=`cat rootzfs.txt`
+
+if [ ! -f user.txt ]; then echo "No user specified."; exit 2; fi
+if [ ! -f hosts.txt ]; then echo "No hosts specified."; exit 2; fi
+if [ ! -f rootzfs.txt ]; then echo "No rootzfs specified."; exit 2; fi
+
+list_filesets()
+{
+    zfs list | tail -n +2 | cut -d' ' -f1|grep ${BAKRNG_ROOT}
+}
+
+get_latest_snapshot()
+{
+    zfs list -t snapshot |
+        grep ${BAKRNG_ROOT} |
+        tail -n1 |
+        cut -d'@' -f2 |
+        cut -d' ' -f 1
+}
+
+setup_aggregator()
+{
+    zfs allow -u `cat user.txt` send,snapshot,hold ${BAKRNG_ROOT}
+    for dataset in `cat datasets.txt`; do
+	    zfs create $dataset
+    done
+}
+
+setup_mirror()
+{
+    zfs allow -u `cat user.txt` send,snapshot,hold ${BAKRNG_ROOT}
+    zfs allow -du `cat user.txt` \
+        compression,mountpoint,receive,create,mount ${BAKRNG_ROOT}
+}
+
+create_snapshot()
+{
+    id="`date -I`-`date +%s`"
+    echo zfs snapshot -r ${BAKRNG_ROOT}@${id}
+}
+
+send_single_snapshot()
+{
+    BAKRNG_SEND_SNAPSHOT=`get_latest_snapshot`
+    while read BAKRNG_REMOTE_ADDR BAKRNG_REMOTE_PORT BAKRNG_REMOTE_ROOT; do
+        echo "zfs send -R ${BAKRNG_ROOT}@${BAKRNG_SEND_SNAPSHOT} |
+            ssh -i ~/.ssh/id_rsa \
+            -o port=${BAKRNG_REMOTE_PORT} ${BAKRNG_REMOTE_ADDR} \
+            zfs receive -dvu ${BAKRNG_REMOTE_ROOT}@${BAKRNG_SEND_SNAPSHOT}"
+    done
+    # echo $BAKRNG_SEND_SNAPSHOT > "last-snapshot.txt"
+}
+
+send_incremental_snapshop()
+{
+    BAKRNG_SEND_SNAPSHOT=`get_latest_snapshot`
+    while read BAKRNG_REMOTE_ADDR BAKRNG_REMOTE_PORT BAKRNG_REMOTE_ROOT; do
+        echo "zfs send -R -i `cat last-snapshot.txt` \
+            ${BAKRNG_ROOT}@${BAKRNG_SEND_SNAPSHOT} | ssh -i ~/.ssh/id_rsa \
+            -o port=${BAKRNG_REMOTE_PORT} ${BAKRNG_REMOTE_ADDR} \
+            zfs receive -dvu ${BAKRNG_REMOTE_ROOT}@${BAKRNG_SEND_SNAPSHOT}"
+    done
+    # echo $BAKRNG_SEND_SNAPSHOT > "last-snapshot.txt"
+}
+
+
+if [ -f "last-snapshot.txt" ]; then
+    send_incremental_snapshop
+else
+    send_single_snapshot
+fi