backupninja/handlers/dup.in

# -*- mode: sh; sh-basic-offset: 3; indent-tabs-mode: nil; -*-
# vim: set filetype=sh sw=3 sts=3 expandtab autoindent:
#
# duplicity script for backupninja
# requires duplicity
#

getconf options
getconf testconnect yes
getconf nicelevel 0
getconf tmpdir

setsection gpg
getconf password
getconf sign no
getconf encryptkey
getconf signkey

setsection source
getconf include
getconf vsnames all
getconf vsinclude
getconf exclude

setsection dest
getconf incremental yes
getconf keep 60
getconf desturl
getconf sshoptions
getconf bandwidthlimit 0
getconf desthost
getconf destdir
getconf destuser
destdir=${destdir%/}

### SANITY CHECKS ##############################################################

[ -n "$desturl" -o -n "$destdir" ]  || fatal "The destination directory (destdir) must be set when desturl is not used."
[ -n "$include" -o -n "$vsinclude" ]  || fatal "No source includes specified"
[ -n "$password" ] || fatal "The password option must be set."

### VServers
# If vservers are configured, check that the ones listed in $vsnames do exist.
local usevserver=no
if [ $vservers_are_available = yes ]; then
   if [ "$vsnames" = all ]; then
      vsnames="$found_vservers"
   else
      if ! vservers_exist "$vsnames" ; then
            fatal "At least one of the vservers listed in vsnames ($vsnames) does not exist."
      fi
   fi
   if [ -n "$vsinclude" ]; then
      info "Using vservers '$vsnames'"
      usevserver=yes
   fi
else
   [ -z "$vsinclude" ] || warning 'vservers support disabled in backupninja.conf, vsincludes configuration lines will be ignored'
fi

### See if we can login on $desthost
if [ "$testconnect" == "yes" ]; then
   if [ -n "$desturl" ]; then
      warning 'testconnect can not be used when desturl is set'
   else
      debug "ssh $sshoptions -o PasswordAuthentication=no $desthost -l $destuser 'echo -n 1'"
      if [ ! $test ]; then
         result=`ssh $sshoptions -o PasswordAuthentication=no $desthost -l $destuser 'echo -n 1'`
         if [ "$result" != "1" ]; then
            fatal "Can't connect to $desthost as $destuser."
         else
            debug "Connected to $desthost as $destuser successfully"
         fi
      fi
   fi
fi

### COMMAND-LINE MANGLING ######################################################

### initialize $execstr*
execstr_command=
execstr_options="$options --no-print-statistics"
execstr_source=
if [ -n "$desturl" ]; then
   [ -z "$destuser" ] || warning 'the configured destuser is ignored since desturl is set'
   [ -z "$desthost" ] || warning 'the configured desthost is ignored since desturl is set'
   [ -z "$destdir" ] || warning 'the configured destdir is ignored since desturl is set'
   execstr_serverpart="$desturl"
else
   execstr_serverpart="scp://$destuser@$desthost/$destdir"
fi

### duplicity version
duplicity_version="`duplicity --version | @AWK@ '{print $2}'`"
duplicity_major="`echo $duplicity_version | @AWK@ -F '.' '{print $1}'`"
duplicity_minor="`echo $duplicity_version | @AWK@ -F '.' '{print $2}'`"
duplicity_sub="`echo $duplicity_version | @AWK@ -F '.' '{print $3}'`"

### ssh/scp/sftp options
# 1. duplicity >= 0.4.2 needs --sftp-command
#    (NB: sftp does not support the -l option)
# 2. duplicity 0.4.3 to 0.4.9 replace --ssh-command with --ssh-options, which is
#    passed to scp and sftp commands by duplicity. We don't use it: since this
#    version does not use the ssh command anymore, we keep compatibility with
#    our previous config files by passing $sshoptions to --scp-command and
#    --sftp-command ourselves

scpoptions="$sshoptions"
if [ "$bandwidthlimit" != 0 ]; then
   [ -z "$desturl" ] || warning 'The bandwidthlimit option is not used when desturl is set.'
   scpoptions="$scpoptions -l $bandwidthlimit"
fi

# < 0.4.2 : only uses ssh and scp
if [ "$duplicity_major" -le 0 -a "$duplicity_minor" -le 4 -a "$duplicity_sub" -lt 2 ]; then
   execstr_options="${execstr_options} --scp-command 'scp $scpoptions' --ssh-command 'ssh $sshoptions'"
# >= 0.4.2 : also uses sftp, --sftp-command option is now supported
else
   sftpoptions="$sshoptions"
   # == 0.4.2 : uses ssh, scp and sftp
   if [ "$duplicity_major" -eq 0 -a "$duplicity_minor" -eq 4 -a "$duplicity_sub" -eq 2 ]; then
      execstr_options="${execstr_options} --scp-command 'scp $scpoptions' --sftp-command 'sftp $sftpoptions' --ssh-command 'ssh $sshoptions'"
   # >= 0.4.3 : uses only scp and sftp, --ssh-command option is not supported anymore
   else
      execstr_options="${execstr_options} --scp-command 'scp $scpoptions' --sftp-command 'sftp $sftpoptions'"
   fi
fi

### Symmetric or asymmetric (public/private key pair) encryption
if [ -n "$encryptkey" ]; then
   execstr_options="${execstr_options} --encrypt-key $encryptkey"
   debug "Data will be encrypted with the GnuPG key $encryptkey."
else
   debug "Data will be encrypted using symmetric encryption."
fi

### Data signing (or not)
if [ "$sign" == yes ]; then
   # duplicity is not able to sign data when using symmetric encryption
   [ -n "$encryptkey" ] || fatal "The encryptkey option must be set when signing."
   # if needed, initialize signkey to a value that is not empty (checked above)
   [ -n "$signkey" ] || signkey="$encryptkey"
   execstr_options="${execstr_options} --sign-key $signkey"
   debug "Data will be signed will the GnuPG key $signkey."
else
   debug "Data won't be signed."
fi

### Incremental or full backup mode
# If incremental==yes, use the default duplicity behaviour: perform an
# incremental backup if old signatures can be found, else switch to
# full backup.
# If incremental==no, force a full backup anyway.
if [ "$incremental" == "no" ]; then
   # before 0.4.4, full was an option and not a command
   if [ "$duplicity_major" -le 0 -a "$duplicity_minor" -le 4 -a "$duplicity_sub" -lt 4 ]; then
      execstr_options="${execstr_options} --full"
   else
      execstr_command="full"
   fi
fi

### Temporary directory
precmd=
if [ -n "$tmpdir" ]; then
   if [ ! -d "$tmpdir" ]; then
      info "Temporary directory ($tmpdir) does not exist, creating it."
      mkdir -p "$tmpdir"
      [ $? -eq 0 ] || fatal "Could not create temporary directory ($tmpdir)."
      chmod 0700 "$tmpdir"
   fi
   info "Using $tmpdir as TMPDIR"
   precmd="${precmd}TMPDIR=$tmpdir "
fi

### Cleanup old backup sets (or not)
if [ "$keep" != "yes" ]; then
   if [ "`echo $keep | tr -d 0-9`" == "" ]; then
      keep="${keep}D"
   fi
   # before 0.4.4, remove-older-than was an option and not a command
   if [ "$duplicity_major" -le 0 -a "$duplicity_minor" -le 4 -a "$duplicity_sub" -lt 4 ]; then
      execstr_options="${execstr_options} --remove-older-than $keep"
   fi
fi

### Source

set -o noglob

# excludes
for i in $exclude; do
   str="${i//__star__/*}"
   execstr_source="${execstr_source} --exclude '$str'"
done

# includes
for i in $include; do
   [ "$i" != "/" ] || fatal "Sorry, you cannot use 'include = /'"
   str="${i//__star__/*}"
   execstr_source="${execstr_source} --include '$str'"
done

# vsincludes
if [ $usevserver = yes ]; then
   for vserver in $vsnames; do
      for vi in $vsinclude; do
         str="${vi//__star__/*}"
         str="$VROOTDIR/$vserver$str"
         execstr_source="${execstr_source} --include '$str'"
      done
   done
fi

set +o noglob

### EXECUTE ####################################################################

execstr_source=${execstr_source//\\*/\\\\\\*}

### Cleanup commands (duplicity >= 0.4.4)

# cleanup
if [ "$duplicity_major" -ge 0 -a "$duplicity_minor" -ge 4 -a "$duplicity_sub" -ge 4 ]; then
   debug "$precmd duplicity cleanup --force $execstr_options $execstr_serverpart"
   if [ ! $test ]; then
      export PASSPHRASE=$password
      output=`nice -n $nicelevel \
         su -c \
         "$precmd duplicity cleanup --force $execstr_options $execstr_serverpart 2>&1"`
      exit_code=$?
      if [ $exit_code -eq 0 ]; then
         debug $output
         info "Duplicity cleanup finished successfully."
      else
         debug $output
         warning "Duplicity cleanup failed."
      fi
   fi
fi

# remove-older-than
if [ "$keep" != "yes" ]; then
   if [ "$duplicity_major" -ge 0 -a "$duplicity_minor" -ge 4 -a "$duplicity_sub" -ge 4 ]; then
      debug "$precmd duplicity remove-older-than $keep --force $execstr_options $execstr_serverpart"
      if [ ! $test ]; then
         export PASSPHRASE=$password
         output=`nice -n $nicelevel \
                   su -c \
                      "$precmd duplicity remove-older-than $keep --force $execstr_options $execstr_serverpart 2>&1"`
         exit_code=$?
         if [ $exit_code -eq 0 ]; then
            debug $output
            info "Duplicity remove-older-than finished successfully."
         else
            debug $output
            warning "Duplicity remove-older-than failed."
         fi
      fi
   fi
fi

### Backup command
debug "$precmd duplicity $execstr_command $execstr_options $execstr_source --exclude '**' / $execstr_serverpart"
if [ ! $test ]; then
   export PASSPHRASE=$password
   output=`nice -n $nicelevel \
             su -c \
                "$precmd duplicity $execstr_command $execstr_options $execstr_source --exclude '**' / $execstr_serverpart 2>&1"`
   exit_code=$?
   if [ $exit_code -eq 0 ]; then
      debug $output
      info "Duplicity finished successfully."
   else
      debug $output
      fatal "Duplicity failed."
   fi
fi

return 0