Add gpg-zip, a la PGP Zip.

tools/ChangeLog

@@ -1,3 +1,10 @@
+2005-08-04  David Shaw  <dshaw@jabberwocky.com>
+
+	* gpg-zip.in: New.  Script wrapper to work with encrypted tar
+	files, a la PGP Zip.
+
+	* Makefile.am: Use it if we have a USTAR compatible tar.
+
 2004-12-18  David Shaw  <dshaw@jabberwocky.com>
 
 	* Makefile.am: Link with readline where needed.

tools/Makefile.am

@@ -27,6 +27,10 @@ other_libs = $(LIBICONV) $(LIBINTL) $(CAPLIBS)
 bin_PROGRAMS    = gpgsplit
 noinst_PROGRAMS = mpicalc bftest clean-sat mk-tdata shmtest
 
+if HAVE_USTAR
+bin_SCRIPTS = gpg-zip
+endif
+
 gpgsplit_LDADD  = $(needed_libs) $(other_libs) @ZLIBS@
 mpicalc_LDADD   = $(needed_libs) $(other_libs) @W32LIBS@
 bftest_LDADD    = $(needed_libs) $(other_libs) @W32LIBS@ @DLLIBS@ @NETLIBS@ @LIBREADLINE@

tools/gpg-zip.in

@@ -0,0 +1,128 @@
+#!/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 2 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+
+# 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=@VERSION@
+TAR=@TAR@
+GPG=gpg
+
+usage="\
+Usage: gpg-zip [--help] [--version] [--encrypt] [--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
+      shift
+      ;;
+    --encrypt | -e)
+      gpg_args="$gpg_args --encrypt"
+      list=no
+      create=yes
+      shift
+      ;;
+    --symmetric | -c)
+      gpg_args="$gpg_args --symmetric"
+      list=no
+      create=yes
+      shift
+      ;;
+    --sign | -s)
+      gpg_args="$gpg_args --sign"
+      list=no
+      create=yes
+      shift
+      ;;
+    --recipient | -r)
+      gpg_args="$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" >&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 -" >&2
+   cat $1 | $GPG $gpg_args | $TAR $tar_args -tf -
+else
+   echo "$usage" 1>&2
+   exit 1
+fi