# -*- 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 >= 0.4.4, and >= 0.4.9 when using a custom tmpdir.
#

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 increments 30
getconf keep 60
getconf keepincroffulls all
getconf desturl
getconf awsaccesskeyid
getconf awssecretaccesskey
getconf cfusername
getconf cfapikey
getconf cfauthurl
getconf ftp_password
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."
if [ "`echo $desturl | @AWK@ -F ':' '{print $1}'`" == "s3+http" ]; then
   [ -n "$awsaccesskeyid" -a -n "$awssecretaccesskey" ]  || fatal "AWS access keys must be set for S3 backups."
fi
if [ "`echo $desturl | @AWK@ -F ':' '{print $1}'`" == "cf+http" ]; then
   [ -n "$cfusername" -a -n "$cfapikey" ]  || fatal "Cloudfiles access keys must be set for S3 backups."
fi
if [ "`echo $desturl | @AWK@ -F ':' '{print $1}'`" == "ftp" ]; then
   [ -n "$ftp_password" ]  || fatal "ftp_password must be set for FTP backups."
fi

### VServers
# If vservers are configured, check that the ones listed in $vsnames do exist.
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 $execstr*
execstr_precmd=
execstr_command=
execstr_options="$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 (ignore anything else than 0-9 and ".")
duplicity_version="`duplicity --version | @AWK@ '{print $2}' | @SED@ 's/[^.[:digit:]]//g'`"
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 (duplicity < 0.4.3 is unsupported)
## duplicity >= 0.6.17 : paramiko backend
if [ "$duplicity_major" -ge 0 -a "$duplicity_minor" -ge 6 -a "$duplicity_sub" -ge 17 ]; then
   if [ -n "$sshoptions" ]; then
      echo "$sshoptions" | grep -Eqs '^-o[[:space:]]*IdentityFile=[^ ]+$' \
         || warning 'duplicity >= 0.6.17 only supports the IdentityFile SSH option'
   fi
   execstr_options="${execstr_options} --ssh-options '$sshoptions'"
   # FIXME: use trickle
   if [ "$bandwidthlimit" != 0 ]; then
      [ -z "$desturl" ] || warning 'The bandwidthlimit option is not used when desturl is set.'
      execstr_precmd="trickle -s -d $bandwidthlimit -u $bandwidthlimit"
   fi
## duplicity < 0.6.17 : scp/sftp backend
else
   scpoptions="$sshoptions"
   if [ "$bandwidthlimit" != 0 ]; then
      [ -z "$desturl" ] || warning 'The bandwidthlimit option is not used when desturl is set.'
      scpoptions="$scpoptions -l $bandwidthlimit"
   fi
   sftpoptions="$sshoptions"
   execstr_options="${execstr_options} --scp-command 'scp $scpoptions' --sftp-command 'sftp $sftpoptions'"
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 [ "$incremental" == "no" ]; then
   execstr_command="full"
else
   # we're in incremental mode
   if [ "$increments" != "keep" ]; then
      # if we don't want to keep every increments
      if [ "`echo $increments | tr -d 0-9`" == "" ]; then
         increments="${increments}D"
      fi
      execstr_options="${execstr_options} --full-if-older-than $increments"
   fi
fi

### Cleanup options
execstr_options="${execstr_options} --extra-clean"

### Temporary directory
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 $tmpdir as TMPDIR"
   execstr_options="${execstr_options} --tempdir '$tmpdir'"
fi

### Archive directory
# duplicity now enables the archive_dir by default, let's put it into /var/cache/backupninja/duplicity
# unless the user has specified it.
if echo "${options}" | grep -qv -- "--archive-dir" ; then
   execstr_options="${execstr_options} --archive-dir /var/cache/backupninja/duplicity"
fi

### Cleanup old backup sets (or not)
if [ "$keep" != "yes" ]; then
   if [ "`echo $keep | tr -d 0-9`" == "" ]; then
      keep="${keep}D"
   fi
fi

### Source

set -o noglob

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

# includes
SAVEIFS=$IFS
IFS=$(echo -en "\n\b")
for i in $include; do
   [ "$i" != "/" ] || fatal "Sorry, you cannot use 'include = /'"
   str="${i//__star__/*}"
   execstr_source="${execstr_source} --include '$str'"
done
IFS=$SAVEIFS

# vsincludes
if [ $usevserver = yes ]; then
   for vserver in $vsnames; do
      SAVEIFS=$IFS
      IFS=$(echo -en "\n\b")
      for vi in $vsinclude; do
         str="${vi//__star__/*}"
         str="$VROOTDIR/$vserver$str"
         execstr_source="${execstr_source} --include '$str'"
      done
      IFS=$SAVEIFS
   done
fi

set +o noglob

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

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

### If desturl is an S3 URL export the AWS environment variables
if [ "`echo $desturl | @AWK@ -F ':' '{print $1}'`" == "s3+http" ]; then
   export AWS_ACCESS_KEY_ID="$awsaccesskeyid"
   export AWS_SECRET_ACCESS_KEY="$awssecretaccesskey"
fi

### If desturl is a RackSpace's CloudFiles URL export the relevant
### environment variables
if [ "`echo $desturl | @AWK@ -F ':' '{print $1}'`" == "cf+http" ]; then
   export CLOUDFILES_USERNAME="$cfusername"
   export CLOUDFILES_APIKEY="$cfapikey"
   if [ -n "$cfauthurl" ]; then
      export CLOUDFILES_AUTHURL="$cfauthurl"
   fi
fi

### Cleanup commands (duplicity >= 0.4.4)

# cleanup
debug "$execstr_precmd duplicity cleanup --force $execstr_options $execstr_serverpart"
if [ ! $test ]; then
   export PASSPHRASE=$password
   export FTP_PASSWORD=$ftp_password
   output=`nice -n $nicelevel \
             su -c \
             "$execstr_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

# remove-older-than
if [ "$keep" != "yes" ]; then
   debug "$execstr_precmd duplicity remove-older-than $keep --force $execstr_options $execstr_serverpart"
   if [ ! $test ]; then
      export PASSPHRASE=$password
      export FTP_PASSWORD=$ftp_password
      output=`nice -n $nicelevel \
                su -c \
                "$execstr_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

# remove-all-inc-of-but-n-full : remove increments of older full backups : only keep latest ones
if [ "$keep" != "yes" ]; then
   if [ "$keepincroffulls" != "all" ]; then
      if [ "$duplicity_major" -ge 0 -a "$duplicity_minor" -ge 6 -a "$duplicity_sub" -ge 10 ]; then
         debug "$execstr_precmd duplicity remove-all-inc-of-but-n-full $keepincroffulls --force $execstr_options $execstr_serverpart"
         if [ ! $test ]; then
            export PASSPHRASE=$password
            export FTP_PASSWORD=$ftp_password
            output=`nice -n $nicelevel \
               su -c \
               "$execstr_precmd duplicity remove-all-inc-of-but-n-full $keepincroffulls --force $execstr_options $execstr_serverpart 2>&1"`
            exit_code=$?
            if [ $exit_code -eq 0 ]; then
               debug $output
               info "Duplicity remove-all-inc-of-but-n-full finished successfully."
            else
               debug $output
               warning "Duplicity remove-all-inc-of-but-n-full failed."
            fi
         fi
      fi
   fi
fi

### Backup command
debug "$execstr_precmd duplicity $execstr_command $execstr_options $execstr_source --exclude '**' / $execstr_serverpart"
if [ ! $test ]; then
   outputfile=`maketemp backupout`
   export PASSPHRASE=$password
   export FTP_PASSWORD=$ftp_password
   output=`nice -n $nicelevel \
             su -c \
                "$execstr_precmd duplicity $execstr_command $execstr_options $execstr_source --exclude '**' / $execstr_serverpart >$outputfile 2>&1"`
   exit_code=$?
   debug $output
   cat $outputfile | (while read output ; do
                         info $output
                      done
   )
   if [ $exit_code -eq 0 ]; then
      info "Duplicity finished successfully."
   else
      fatal "Duplicity failed."
   fi
   rm $outputfile
fi

return 0
