Re: birgers RFE #2

[cwillu <cwillu@cwillu.com>]

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And none of them are what I would consider remotely useful for
backups.  (What, you guys don't backup to external media?)  :)

Attached is my nightly backup script, edit it to suit, and dump a
symlink into /etc/cron.daily or whatever.  It requires a btrfs target
(rather than source).

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#!/bin/bash

renice 20 $$
ionice -c3 -p$$

# export DISPLAY=:0

echo $(date) Starting backups >> /var/log/backup

# some day, make this find suitable drives automatically
BACKUP_TO_A="/media/drive_a/"  
BACKUP_TO_B="/media/drive_b/"

# abort if there's no backup drive connected
mountpoint "$BACKUP_TO_A" && BACKUP_TO="$BACKUP_TO_A"
mountpoint "$BACKUP_TO_B" && BACKUP_TO="$BACKUP_TO_B"
mountpoint "$BACKUP_TO"  || exit

YESTERDAY="$(ls -1t ${BACKUP_TO} | head -n 1)"
TODAY="$(date +%F)"

echo Will snapshot ${YESTERDAY} to ${TODAY} >> /var/log/backup

btrfs subvolume snapshot "${BACKUP_TO}/${YESTERDAY}" "${BACKUP_TO}/${TODAY}" || exit 1

BACKUP_TO="${BACKUP_TO}/${TODAY}"

echo $(date) Backing up to $BACKUP_TO >> /var/log/backup

eval `ssh-agent`
ssh-add

# Delete files which no longer exist in the destination, 
# even if errors occur during the transfer.  Exclude a handful
# of potentially troublesome directories (even though we use -x,
# .gvfs is often not readable by root)
STANDARD_PARMS="--delete --ignore-errors --exclude .local/share/Trash/ --exclude .gvfs/ --exclude /media/"

# List copied files, do the typical backup thing (attributes, 
# mod-dates, etc), stay on the source filesystem, and use 
# relative pathnames so that we can keep backup explicitely 
# listed sub-mounts filesystems to the 'right' place.
PARMS="-vaxR $STANDARD_PARMS"
MOUNTS="-vaR $STANDARD_PARMS" 

do_backup ()
{
  TARGET_USER="$1"
  TARGET_HOST="$2"
  TARGET_PATH="$3"
  
  echo $TARGET_HOST:$TARGET_PATH Try >> /var/log/backup
  
  STORE_PATH="$BACKUP_TO/$TARGET_HOST"
  ping -c 1 $TARGET_HOST && {
    echo $(date) $TARGET_HOST:$TARGET_PATH Start >> /var/log/backup
  	
    mkdir -p $STORE_PATH
    rsync $PARMS $TARGET_USER@$TARGET_HOST:$TARGET_PATH $STORE_PATH
    echo $(date) $TARGET_HOST@$TARGET_PATH Complete >> /var/log/backup
  }
}

do_local_backup ()
{
  TARGET_PATH="$1"

  STORE_PATH="$BACKUP_TO/local"

  echo local:$TARGET_PATH Try >> /var/log/backup

  # mountpoint $TARGET_PATH is not used because the mount point will
  # often exist even if though the device isn't there.  That would be
  # a problem given that we delete files that are missing from the
  # source; the --max-delete option is not a sane alternative solution.
  find $TARGET_PATH -maxdepth 0 -not -empty -type d | grep / && {
    echo $(date) local:$TARGET_PATH Start >> /var/log/backup

    mkdir -p $STORE_PATH
    rsync $PARMS $TARGET_PATH $STORE_PATH
    echo $(date) local:$TARGET_PATH Complete >> /var/log/backup
  }
}

do_backup root some-hostname-here / &
PARMS="$PARMS --exclude foo/ --exclude Music/" do_backup root some-other-hostname / &

do_local_backup / &
PARMS="$MOUNTS" do_local_backup /media/silly-windows-machine &

wait
ssh-agent -k
echo $(date) Backups completed  >> /var/log/backup