# -*- 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 ionicelevel
getconf tmpdir

setsection gpg
getconf password
getconf signpassword
getconf sign no
getconf encryptkey
getconf signkey

setsection source
getconf include
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 dropboxappkey
getconf dropboxappsecret
getconf dropboxaccesstoken
getconf ftp_password
getconf sshoptions
getconf bandwidthlimit 0
getconf desthost
getconf destdir
getconf destuser
destdir=${destdir%/}

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

if [ -z "$desturl" ]; then
   # desturl undefined, ensure desthost, destuser and destdir are set
   [ -n "$desthost" ] || fatal "The destination host (desthost) must be set when desturl is not used."
   [ -n "$destuser" ] || fatal "The destination user (destuser) must be set when desturl is not used."
   [ -n "$destdir" ] || fatal "The destination directory (destdir) must be set when desturl is not used."
else
   # desturl overrides other destination specifiers, warn if they are used
   [ -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'
fi

[ -n "$include" ]  || fatal "No source includes specified."

[ -n "$password" ] || fatal "The password option must be set."

if [ -n "$signkey" -a -n "$encryptkey" -a "$signkey" != "$encryptkey" ]; then
   [ -n "$signpassword" ] || fatal "The signpassword option must be set because signkey is different from encryptkey."
fi

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 $1}'`" == "dpbx" ]; then
   [ -n "$dropboxappkey" -a -n "$dropboxappsecret" ]  || fatal "Dropbox app ID and secret must be set for Dropbox backups."

   if [ ! -n "$dropboxaccesstoken" ]; then
      error "To obtain an access token for Dropbox, you will need to manually run this command:"
      error "DPBX_APP_KEY=$dropboxappkey DPBX_APP_SECRET=$dropboxappsecret duplicity list-current-files $desturl"
      fatal "Dropbox access token must be set"
   fi
fi

# Ensure ftp_password is defined if needed
if [ "`echo $desturl | @AWK@ -F ':' '{print $1}'`" == "ftp" ]; then
   [ -n "$ftp_password" ]  || fatal "ftp_password must be set for FTP backups."
fi

# Check that the ionicelevel is valid
if [ -n "$ionicelevel" ] && echo "$ionicelevel" | grep -vq "^[0-7]$"; then
   fatal "The value of ionicelevel is expected to be either empty or an integer from 0 to 7. Got: $ionicelevel"
fi

# Only use ionice if ionicelevel is not empty
nice="nice -n $nicelevel"
if [ -n "$ionicelevel" ]; then
   nice="ionice -c2 -n $ionicelevel $nice"
fi

### See if we can login on $desthost
[ -n "$test" ] || test=0
if [ "$testconnect" == "yes" ] || [ "${test}" -eq 1 ]; 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'"
      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

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

### initialize $execstr*
execstr_precmd='LC_ALL=C'
execstr_command=
execstr_options="$options --no-print-statistics"
execstr_source=
if [ -n "$desturl" ]; then
   execstr_serverpart="$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'`"

### ssh/scp/sftp options (duplicity < 0.4.3 is unsupported)
## duplicity >= 0.6.17 : paramiko backend
if version_ge "$duplicity_version" '0.6.17'; then
   if [ -n "$sshoptions" ]; then
      if echo "$sshoptions" | grep -Eqs '^-o[[:space:]]*IdentityFile=[^ ]+$' ; then
         spaceless_sshoptions="$(echo -n "$sshoptions" | @SED@ 's/^-o[[:space:]]*/-o/')"
         if [ "$spaceless_sshoptions" != "$sshoptions" ] ; then
            warning 'Since duplicity >= 0.6.17, sshoptions option requires no space between -o and IdentityFile.'
            warning 'The bad space has been ignored. Update your duplicity handler config file to suppress this message.'
            sshoptions="$spaceless_sshoptions"
         fi
      else
         warning 'duplicity >= 0.6.17 only supports the IdentityFile SSH option'
      fi
   fi
   execstr_options="${execstr_options} --ssh-options '$sshoptions'"
   if [ "$bandwidthlimit" != 0 ]; then
      if [ "`echo $desturl | @AWK@ -F ':' '{print $1}'`" == "file" ]; then
         warning 'The bandwidthlimit option is not used with a local file path destination.'
      else
         execstr_precmd="trickle -s -d $bandwidthlimit -u $bandwidthlimit"
      fi
   fi
## duplicity < 0.6.17 : scp/sftp backend
else
   scpoptions="$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

### Encryption and signing
if [ -n "$encryptkey" ]; then
   if [ "$sign" = yes ]; then
      if [ -n "$signkey" -a "$encryptkey" != "$signkey" ]; then
         # encryptkey and signkey are different
         debug "Data will be encrypted with the GnuPG key $encryptkey."
         debug "Data will be signed with the GnuPG key $signkey."
         execstr_options="${execstr_options} --encrypt-key $encryptkey --sign-key $signkey"
      else
         # encryptkey and signkey identical
         debug "Data will be encrypted ang signed with the GnuPG key $encryptkey."
         execstr_options="${execstr_options} --encrypt-sign-key $encryptkey"
      fi
   else
      execstr_options="${execstr_options} --encrypt-key $encryptkey"
      debug "Data will be encrypted with the GnuPG key $encryptkey."
      debug "Data won't be signed."
   fi
elif [ "$sign" == yes ]; then
   # duplicity is not able to sign data when using symmetric encryption
   fatal "The encryptkey option must be set when signing."
else
   debug "Data will be encrypted using symmetric encryption."
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
if ! version_ge "$duplicity_version" '0.6.20'; then
   execstr_options="${execstr_options} --extra-clean"
fi

### 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 "${options}" | grep -qv -- "--archive-dir" ; then
   [ -d "/var/cache/backupninja" ] || fatal "/var/cache/backupninja does not exist - create it"
   execstr_options="${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

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

### If desturl is a Dropbox URL, export the relevant environment variables
if [ "`echo $desturl | @AWK@ -F ':' '{print $1}'`" == "dpbx" ]; then
   export DPBX_APP_KEY="$dropboxappkey"
   export DPBX_APP_SECRET="$dropboxappsecret"
   export DPBX_ACCESS_TOKEN="$dropboxaccesstoken"
fi

### Cleanup commands (duplicity >= 0.4.4)

# cleanup
debug "$nice $execstr_precmd duplicity cleanup --force $execstr_options $execstr_serverpart"
if [ $test = 0 ]; then
   export PASSPHRASE=$password
   export SIGN_PASSPHRASE=$signpassword
   export FTP_PASSWORD=$ftp_password
   output=`$nice su -c \
             "$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 [ "$keep" != "yes" ]; then
   debug "$nice $execstr_precmd duplicity remove-older-than $keep --force $execstr_options $execstr_serverpart"
   if [ ! $test ]; then
      export PASSPHRASE=$password
      export SIGN_PASSPHRASE=$signpassword
      export FTP_PASSWORD=$ftp_password
      output=`$nice su -c \
                "$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 version_ge "$duplicity_version" '0.6.10'; then
         debug "$nice $execstr_precmd duplicity remove-all-inc-of-but-n-full $keepincroffulls --force $execstr_options $execstr_serverpart"
         if [ $test = 0 ]; then
            export PASSPHRASE=$password
            export SIGN_PASSPHRASE=$signpassword
            export FTP_PASSWORD=$ftp_password
            output=`$nice su -c \
               "$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 "$nice $execstr_precmd duplicity $execstr_command $execstr_options $execstr_source --exclude '**' / $execstr_serverpart"
if [ $test = 0 ]; then
   outputfile=`maketemp backupout`
   export PASSPHRASE=$password
   export SIGN_PASSPHRASE=$signpassword
   export FTP_PASSWORD=$ftp_password
   output=`$nice su -c \
                "$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
                         if [ $exit_code -eq 0 ]; then
                            info "$output"
                         else
                            error "$output"
                         fi
                      done
   )
   if [ $exit_code -eq 0 ]; then
      info "Duplicity finished successfully."
   else
      fatal "Duplicity failed."
   fi
   rm $outputfile
fi

return 0