backupninja/handlers/borg.in

# -*- 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
getconf bwlimit

setsection source
getconf prune yes
getconf keephourly 1
getconf keepdaily 7
getconf keepweekly 4
getconf keepmonthly -1
getconf include
getconf exclude
getconf excludecaches no
getconf excludenodump no

setsection dest
getconf user
getconf host
getconf directory
# strip trailing /
directory=${directory%/}
getconf archive {now:%Y-%m-%dT%H:%M:%S}
getconf compression lz4
getconf encryption none
getconf passphrase

export BORG_PASSPHRASE="$passphrase"

### CHECK CONFIG ###

# 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"

# 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 $user 'echo -n 1'`
   if [ "$ret" = 1 ]; then
      debug "Connected to $host as $user successfully"
   else
      teststr="borg list --show-rc -v $execstr_repository"
      debug "$teststr"
      output=`su -c "$teststr" 2>&1`
      if echo "$output" | grep "terminating with success status" ; then
         debug "Connected to $host as $user successfully (forced command)"
      else
         if echo "$output" | grep -E "Repository.+does not exist" ; then
            debug "Connected to $host as $user successfully (forced command)"
         else
            fatal "Can't connect to $host as $user."
         fi
      fi
   fi
fi

### INIT IF NEEDED ###

initstr="borg init --encryption=$encryption $execstr_repository"

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

if [ ! -z $bwlimit ]; then
   execstr="${execstr} --remote-ratelimit=${bwlimit}"
fi

if [ "$excludecaches" == "yes" ]; then
   execstr="${execstr} --exclude-caches"
fi

if [ "$excludenodump" == "yes" ]; then
   execstr="${execstr} --exclude-nodump"
fi

# 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-hourly $keephourly --keep-daily $keepdaily --keep-weekly $keepweekly --keep-monthly $keepmonthly $execstr_repository"
debug "$prunestr"

if [ $test = 0 ] && [ "$prune" == "yes" ]; 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

unset BORG_PASSPHRASE

return 0