borglocal

# -*- mode: sh; sh-basic-offset: 3; indent-tabs-mode: nil; -*-
# vim: set filetype=sh sw=3 sts=3 expandtab autoindent:
#
# borg handler script for backupninja
# requires borgbackup
#
# Guillaume Subiron, Sysnove, 2016
#
# Copyright 2016 Guillaume Subiron <guillaume@sysnove.fr>
#
# This work is free. You can redistribute it and/or modify it under the
# terms of the Do What The Fuck You Want To Public License, Version 2,
# as published by Sam Hocevar. See the http://www.wtfpl.net/ file for more details.
#
#

export BORG_RELOCATED_REPO_ACCESS_IS_OK=yes

### GET CONFIG ###

getconf testconnect yes
getconf nicelevel 0

setsection source
getconf keepdaily 7
getconf keepweekly 4
getconf keepmonthly -1
getconf include
getconf exclude

setsection dest
getconf user
getconf host
getconf directory
# strip trailing /
directory=${directory%/}

# new variable for drive to mount
destdir=$directory

# subdirectory on the drive
directory=$directory/borgbackup

getconf archive {now:%Y-%m-%d}
getconf compression lz4
getconf passphrase

setsection localdrive
getconf device_name
getconf filesystem_type

#use UUIDs instead of device names if available
getconf device_uuid

#allow multiple UUIDs to be sepcified, only use a connected device
for i in $device_uuid; do
   output=`ls /dev/disk/by-uuid/ | grep $i`
   if [ $? = 0 ]; then
      #look up the UUID with blkid, remove all output after the colon to get the device id
      device_name=`blkid | grep $i | sed -e 's/:.*//'`
      debug "Device name from UUID: $device_name"
   fi
done

#mount the local drive and check its status
umount $device_name

output=`mount -t $filesystem_type $device_name $destdir`
if [ $? = 0 ]; then
  info "External USB drive mounted ($device_name at $destdir)"
else
  error $output
  fatal "External USB drive could not be mounted ($device_name at $destdir)"
fi

# create the directory if it doesn't exist
mkdir -p $directory

### CHECK CONFIG ###

# check the connection at the source and destination
[ -n "$test" ] || test=0
if [ "$host" != "localhost" ] && ([ "$testconnect" = "yes" ] || [ "${test}" -eq 1 ]); then
   debug "ssh -o PasswordAuthentication=no $host -l $user 'echo -n 1'"
   local ret=`ssh -o PasswordAuthentication=no $host -l $user 'echo -n host is alive'`
   if echo $ret | grep "host is alive"; then
      debug "Connected to $host as $user successfully"
   else
      fatal "Can't connect to $host as $user."
   fi
fi

# destination specific checks
[ "$directory" != "" ] || fatal "Destination directory not set"
if [ "$host" != "localhost" ]; then
  execstr_repository="$user@$host:$directory"
else
  execstr_repository="$directory"
fi
execstr_archive="$archive"

### INIT IF NEEDED ###

if [ "$passphrase" != "" ]; then
  export BORG_PASSPHRASE="$passphrase"
  initstr="borg init $execstr_repository"
else
  initstr="borg init --encryption=none $execstr_repository"
fi

debug "$initstr"

if [ $test = 0 ]; then
    output="`su -c "$initstr" 2>&1`"
    if [ $? = 2 ]; then
       debug $output
       info "Repository was already initialized"
    else
       warning $output
       warning "Repository has been initialized"
    fi
fi

### EXECUTE ###

execstr="borg create --stats --compression $compression"

set -o noglob

# includes
SAVEIFS=$IFS
IFS=$(echo -en "\n\b")
for i in $include; do
   includes="${includes} '$i'"
done
IFS=$SAVEIFS

# excludes
SAVEIFS=$IFS
IFS=$(echo -en "\n\b")
for i in $exclude; do
   excludes="${excludes} --exclude '$i'"
done
IFS=$SAVEIFS

set +o noglob

# include client-part and server-part
execstr="${execstr} ${excludes} $execstr_repository::$execstr_archive ${includes}"
debug "$execstr"

if [ $test = 0 ]; then
   output=`nice -n $nicelevel su -c "$execstr" 2>&1`
   if [ $? = 0 ]; then
      debug $output
      info "Successfully finished backing up source $label"
   else
      error $output
      fatal "Failed backuping up source $label"
   fi
fi

### REMOVE OLD BACKUPS ###

# borg prune
prunestr="borg prune --keep-daily $keepdaily --keep-weekly $keepweekly --keep-monthly $keepmonthly $execstr_repository"
debug "$prunestr"

if [ $test = 0 ]; then
   output="`su -c "$prunestr" 2>&1`"
   if [ $? = 0 ]; then
      debug $output
      info "Removing old backups succeeded."
   else
      warning $output
      warning "Failed removing old backups."
   fi
fi

#unmount the external USB drive
output=`umount $device_name`
if [ $? = 0 ]; then
  info "External USB drive unmounted ($device_name at $destdir)"
else
  info $output
  info "External USB drive could not be unmounted ($device_name at $destdir)"
fi

unset BORG_PASSPHRASE

return 0