BorgBackup handler script for backupninja

borg

# -*- 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%/}
getconf archive {now:%Y-%m-%d}
getconf compression lz4
getconf encryption none
getconf encryptkey
getconf bandwidthlimit 0

### CHECK CONFIG ###
execstr_precmd=

# check the connection at the source and destination
[ -n "$test" ] || test=0
if [ "$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

## Check bandwidthlimit not egal 0
if [ "$bandwidthlimit" != 0 ]; then
      execstr_precmd="trickle -s -d $bandwidthlimit -u $bandwidthlimit"
      debug "Bandwidthlimit equal to $bandwidthlimit KB/s"
fi

# destination specific checks
[ "$directory" != "" ] || fatal "Destination directory not set"
execstr_repository="$user@$host:$directory"
execstr_archive="$archive"

## Check encryption
if [ "$encryption" != 'none' ]; then
   if [ -z "$encryptkey" ]; then
      fatal "The encryptkey option must be set when encryption's different of none"
   else
      export BORG_PASSPHRASE=$encryptkey
      encrypt_option='--encryption=repokey'
   fi
else
   encrypt_option='--encryption=none'
fi

## TODO : encryption with keyfile

### INIT IF NEEDED ###

initstr="$execstr_precmd borg init $encrypt_option $execstr_repository"

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

### EXECUTE ###

execstr="$execstr_precmd 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="$exectstr_precmd borg prune --keep-daily $keepdaily --keep-weekly $keepweekly --keep-monthly $keepmonthly $execstr_repository"

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

return 0