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#!/bin/bash
#
# sync a removable volume with system backups.
#

# Parameters.
BASENAME="`basename $0`"
VOLUME="$1"
MEDIA="/media/$VOLUME"
BWLIMIT="2500"
IMAGES="/var/data/crypt/"
RSYNC="ionice -c 3 nice -n 19 rsync -avH --delete --bwlimit=$BWLIMIT"
CP="ionice -c 3 nice -n 19 cp"

# Sync backups for a node.
function sync_backups_node {
  if [ ! -z "$NODE" ]; then
    # Get full node hostname.
    NODE_HOSTNAME="`cat /var/vservers/$NODE/etc/hostname`"
    if [ -z "$NODE_HOSTNAME" ]; then
      NODE_HOSTNAME="$NODE"
    fi

    # Sync local encrypted backup.
    echo "Syncing /var/vservers/$NODE/var/backups/duplicity/..."
    mkdir -p /$MEDIA/$NODE_HOSTNAME/duplicity
    $RSYNC /var/vservers/$NODE/var/backups/duplicity/ /$MEDIA/$NODE_HOSTNAME/duplicity/

    # Sync remote backups.
    for node in `ls /var/vservers/$NODE/var/backups/remote/`; do
      echo "Syncing /var/vservers/$NODE/var/backups/remote/$node/..."
      mkdir -p /$MEDIA/$NODE_HOSTNAME/remote/$node
      $RSYNC /var/vservers/$NODE/var/backups/remote/$node/ /$MEDIA/$NODE_HOSTNAME/remote/$node/
    done
  else
    # Sync local encrypted backup.
    echo "Syncing /var/backups/duplicity/..."
    mkdir -p /$MEDIA/$HOSTNAME/duplicity
    $RSYNC /var/backups/duplicity/ /$MEDIA/$HOSTNAME/duplicity/

    # Sync remote backups.
    for node in `ls /var/backups/remote/`; do
      echo "Syncing /var/backups/remote/$node/..."
      mkdir -p /$MEDIA/$HOSTNAME/remote/$node/
      $RSYNC /var/backups/remote/$node/ /$MEDIA/$HOSTNAME/remote/$node/
    done

    # Copy encrypted images.
    if [ -d "$IMAGES" ]; then
      for image in `find $IMAGES -name '*.img' -type f`; do
        echo "Copying image to /$MEDIA/$HOSTNAME/images/`dirname $image`"
        mkdir -p /$MEDIA/$HOSTNAME/images/`dirname $image`
        $CP $image /$MEDIA/$HOSTNAME/images/`dirname $image`
      done
    fi
  fi
}

# Parsing.
if [ -z "$VOLUME" ]; then
  echo "usage: $BASENAME <media> [nodes]"
  exit 1
else
  shift
fi

# Sync backups for each node.
if [ ! -z "$*" ]; then
  for NODE in $*; do
    sync_backups_node
  done
else
  sync_backups_node
fi