X-Git-Url: http://git.pippins.net/embedvideo/.git/?a=blobdiff_plain;f=zfs-replicate;h=ef90b54a40148d6077fe6655348654a3610520e1;hb=e5bbf1952d51ab406d73ddb49496422c2d7ebb61;hp=da3df12614ab76e8090bdeb0a468675f09930eeb;hpb=2829ebd14041598193f7291c472380a257afda7d;p=zfs-ubuntu%2F.git

diff --git a/zfs-replicate b/zfs-replicate
index da3df12..ef90b54 100755
--- a/zfs-replicate
+++ b/zfs-replicate
@@ -1,116 +1,36 @@
-#!/bin/bash
+#/bin/bash
 
-# Author: Carl Baldwin & Alan Pippin
-# Description: This script replicates a given zfs filesystem to a given zfs pool.
-#              This script will keep all snapshots in sync, removing the ones
-#              that have been deleted since the last replicate was performed.
-#              This script will only send the new, or missing, snapshots since
-#              the last replicate was performed.
+set -x
 
-# In test mode (test=1) commands are echoed, not executed
-test=0
+# Usage: replicate <hostname> <zfs filesystem>
+remote=$1
+remote_fs=$2
 
-[ $test == 0 ] && exec >> /var/log/zfs/zfs-replicate.log 2>&1
+# The ssh connection doesn't find zfs without this.
+zfs=/usr/sbin/zfs
 
-# Usage: zfs-backup [filesystem] [destination_pool]
-# This script has a limitation with children under a given filesystem.
-# You must initially backup the parent filesystems first using this script
-# before backing up any of the children filesystems.
+# List the snapshots on the remote machine.
+remote_list=$(mktemp /tmp/replicate.XXXXXX)
+ssh $remote \
+    $zfs list -H -t snapshot |
+    grep ^${remote_fs}@ |
+    awk '{print$1}' > $remote_list
 
-fs=$1
-fs=${fs%/}
-fsname=${1#*/}
-srcpool=${1%%/*}
-srcfs="${srcpool}/$fsname"
-srcfs=${srcfs%/}
-dstpool=$2
-dstfs="${dstpool}/$srcfs"
-dstfs=${dstfs%/}
-nodstsnaps=0
-common=""
+# List the snapshots on the local machine.
+local_list=$(mktemp /tmp/replicate.XXXXXX)
+$zfs list -H -t snapshot |
+    grep ^backups/${remote_fs}@ |
+    awk '{gsub(/^backups./,"",$1); print$1}' > $local_list
 
-if [ $test == 1 ]; then
-  echo "fs: $fs"
-  echo "fsname: $fsname"
-  echo "srcpool: $srcpool"
-  echo "srcfs: $srcfs"
-  echo "dstpool: $dstpool"
-  echo "dstfs: $dstfs"
-fi
+# See what the most recent snapshot on the remote end is.
+latest=$(tail -n 1 $remote_list)
 
-if ! zpool list -H "$srcpool" >/dev/null 2>&1; then
-  echo >&2 "-E- The source pool, '$srcpool' doesn't seem to exist."
-  exit 1
-fi
+# I did this to make sure that diff would always display the most recent common
+echo bogus.remote >> $remote_list
+echo bogus.local  >> $local_list
+common=$(diff -u $remote_list $local_list | grep '^ ' | tail -n 1)
 
-if ! zpool list -H "$dstpool" >/dev/null 2>&1; then
-  echo >&2 "-E- The destination pool, '$dstpool' doesn't seem to exist."
-  exit 1
-fi
+ssh $remote $zfs send -R -I${common/*@/@} $latest |
+    $zfs receive -vF -d backups/${remote_fs%/*}
 
-if ! zfs list -rH -t snapshot "$dstfs" 2>&1 | grep "$dstfs@" > /dev/null 2>&1; then
-  echo >&2 "-W- No snapshots detected on the destination drive for this filesystem: $dstfs"
-  if zfs list -t filesystem | grep "$dstfs"; then
-   echo >&2 "-I- Found zfs filesystem $dstfs on the destination pool $dstpool without any snapshots"
-   echo >&2 "-I- Removing the zfs filesystem: $dstfs"
-   zfs destroy "$dstfs" 
-  fi
-  nodstsnaps=1
-fi
-
-if [ $nodstsnaps == 0 ]; then
-  zfs list -rH -t snapshot $srcfs | grep "$srcfs@" | awk '{print $1}' > /tmp/source-list
-  zfs list -rH -t snapshot $dstfs | grep "$dstfs@" | sed "s,$dstpool/,," | awk '{print $1}' > /tmp/destination-list
-  diff -u /tmp/source-list /tmp/destination-list | grep -v '^+++' | awk '/^\+/ {print}' | sed "s,^\+,$dstpool/," > /tmp/obsolete-snapshots
-  rm -f /tmp/source-list /tmp/destination-list
-
-  echo >&2 "Removing obsolete backups from the destination pool" 
-  for snapshot in $(cat /tmp/obsolete-snapshots); do
-    echo >&2 "Removing '$snapshot' from destination."
-    [ $test == 0 ] && zfs destroy "$snapshot"
-  done
-
-  echo >&2 "Rolling back to the most recent snapshot on the destination." 
-  [ $test == 0 ] && zfs rollback $(zfs list -rH -t snapshot $dstfs | grep "$dstfs@" | awk '{snap=$1} END {print snap}')
-
-  echo >&2 "Calculating the most recent common snapshot between the two filesystems." 
-  if zfs list -H "$dstfs" > /dev/null 2>&1; then
-    for snap in $(zfs list -rH -t snapshot "$dstfs" | grep "$dstfs@" |
-                    sed 's,.*@,,' | awk '{print$1}'); do
-      if zfs list -rH -t snapshot "$fs" | grep "$fs@" | sed 's,.*@,,' | awk '{print$1}' | grep "^${snap}$" >/dev/null 2>&1; then
-        common=$snap
-      fi  
-    done
-  fi
-fi
-
-base=$common
-foundcommon=false
-if [ -z "$common" ]; then
-  foundcommon=true
-fi
-
-for snap in $(zfs list -rH -t snapshot "$fs" | grep "$fs@" |
-                sed 's,.*@,,' | awk '{print$1}'); do
-  if [ "$snap" = "$common" ]; then
-    foundcommon=true
-    continue
-  fi
-
-  if $foundcommon; then
-    if [ -z "$base" ]; then
-      echo >&2 "Sending '$fs@$snap'"
-      [ $test == 0 ] && zfs set readonly=on "$dstpool"
-      [ $test == 0 ] && zfs set atime=off "$dstpool"
-      [ $test == 0 ] && zfs set sharenfs=off "$dstpool"
-      [ $test == 0 ] && zfs set mountpoint=legacy "$dstpool"
-      [ $test == 0 ] && zfs send "$fs@$snap" | zfs recv -v "$dstfs"
-    else
-      echo >&2 "Sending '$fs@$base' -> '$fs@$snap'"
-      [ $test == 0 ] && zfs send -i "$fs@$base" "$fs@$snap" | zfs recv -v "$dstfs"
-    fi
-    base=$snap
-  fi
-done
-
-true
+rm -f $local_list $remote_list