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#!/bin/sh

# gpg-archive - gpg-ized tar using the same format as PGP's PGP Zip.
# Copyright (C) 2005 Free Software Foundation, Inc.
#
# This file is part of GnuPG.
#
# GnuPG is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# GnuPG is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, see <http://www.gnu.org/licenses/>.
# Despite the name, PGP Zip format is actually an OpenPGP-wrapped tar
# file.  To be compatible with PGP itself, this must be a USTAR format
# tar file.  Unclear on whether there is a distinction here between
# the GNU or POSIX variant of USTAR.

VERSION=2.0.14
TAR=/bin/tar
GPG=gpg

usage="\
Usage: gpg-zip [--help] [--version] [--encrypt] [--decrypt] [--symmetric]
       [--list-archive] [--output FILE] [--gpg GPG] [--gpg-args ARGS]
       [--tar TAR] [--tar-args ARGS] filename1 [filename2, ...]
       directory1 [directory2, ...]

Encrypt or sign files into an archive."

while test $# -gt 0 ; do
  case $1 in
    -h | --help | --h*)
      echo "$usage"
      exit 0
      ;;
    --list-archive)
      list=yes
      create=no
      unpack=no
      shift
      ;;
    --encrypt | -e)
      gpg_args="$gpg_args --encrypt"
      list=no
      create=yes
      unpack=no
      shift
      ;;
    --decrypt | -d)
      gpg_args="$gpg_args --decrypt"
      list=no
      create=no
      unpack=yes
      shift
      ;;
    --symmetric | -c)
      gpg_args="$gpg_args --symmetric"
      list=no
      create=yes
      unpack=no
      shift
      ;;
    --sign | -s)
      gpg_args="$gpg_args --sign"
      list=no
      create=yes
      unpack=no
      shift
      ;;
    --recipient | -r)
      gpg_args="$gpg_args --recipient $2"
      shift
      shift
      ;;
    --local-user | -u)
      gpg_args="$gpg_args --local-user $2"
      shift
      shift
      ;;
    --output | -o)
      gpg_args="$gpg_args --output $2"
      shift
      shift
      ;;
    --version)
      echo "gpg-zip (GnuPG) $VERSION"
      exit 0
      ;;
    --gpg)
      GPG=$1
      shift
      ;;
    --gpg-args)
      gpg_args="$gpg_args $2"
      shift
      shift
      ;;
    --tar)
      TAR=$1
      shift
      ;;
    --tar-args)
      tar_args="$tar_args $2"
      shift
      shift
      ;;
    --)
      shift
      break
      ;;
    -*)
      echo "$usage" 1>&2
      exit 1
      ;;
    *)
      break
      ;;
  esac
done

if test x$create = xyes ; then
#   echo "$TAR -cf - "$@" | $GPG --set-filename x.tar $gpg_args" 1>&2
   $TAR -cf - "$@" | $GPG --set-filename x.tar $gpg_args
elif test x$list = xyes ; then
#   echo "cat \"$1\" | $GPG $gpg_args | $TAR $tar_args -tf -" 1>&2
   cat "$1" | $GPG $gpg_args | $TAR $tar_args -tf -
elif test x$unpack = xyes ; then
#   echo "cat \"$1\" | $GPG $gpg_args | $TAR $tar_args -xvf -" 1>&2
   cat "$1" | $GPG $gpg_args | $TAR $tar_args -xvf -
else
   echo "$usage" 1>&2
   exit 1
fi