#!/bin/sh
# Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
#
# This file is free software; as a special exception the author gives
# unlimited permission to copy and/or distribute it, with or without
# modifications, as long as this notice is preserved.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

# Please note that this script is now maintained outside of GNUPG.
# To get the most up to date version use
# cvs -d :pserver:anoncvs@cvs.gnupg.org:/cvs/wk checkout misc-scripts/mkdiff

if [ $# != 1 ] ; then
    echo "usage: mkdiff package-name" >&2
    exit 1
fi

pack="$1"

set -e

curr_ver=$(ls $pack-*.tar.gz 2>/dev/null | sed "s/^$pack-\(.*\)\.tar\.gz/\1/"\
	   | sort -r -t '.' -n +0 -1 +1 -2 +2 | head -1 )
if [ ! -f $pack-$curr_ver.tar.gz ]; then
    echo "mkdiff: no current version of package $pack found" >&2
    exit 1
fi
prev_ver=$(ls $pack-*.tar.gz 2>/dev/null | sed "s/^$pack-\(.*\)\.tar\.gz/\1/"\
	   | sort -r -t '.' -n +0 -1 +1 -2 +2 | head -2 | tail -1 )
if [ "$prev_ver" = "$curr_ver"  ]; then
    echo "mkdiff: no previous version of package $pack found" >&2
    exit 1
fi

echo "Current  is: $pack-$curr_ver"
echo "Previous is: $pack-$prev_ver"


echo "Removing old directories"
[ -d "$pack-$curr_ver" ] && rm -rf "$pack-$curr_ver"
[ -d "$pack-$prev_ver" ] && rm -rf "$pack-$prev_ver"

echo "Unpacking previous and current tar"
tar xzf "$pack-$curr_ver.tar.gz"
rm -f $pack-${curr_ver}/po/*.gmo
tar xzf "$pack-$prev_ver.tar.gz"
rm -f $pack-${prev_ver}/po/*.gmo


echo "Diffing"
tmp_name="$pack-$prev_ver-$curr_ver.diff.tmp"
diff_name="$pack-$prev_ver-$curr_ver.diff"

diff -urN "$pack-$prev_ver/" "$pack-$curr_ver/"  > $tmp_name || true

echo "Making patch file"

cat <<EOF > $diff_name

This is a patch file to create version $curr_ver from $prev_ver.

Please check the signature of this patch file:

    zcat somepath/$pack-$prev_ver-$curr_ver.diff.gz | gpg --verify

Change to directory $pack-$prev_ver (or however you renamed it)
and give this command:

     zcat somepath/$pack-$prev_ver-$curr_ver.diff.gz | patch -p1

It is a good idea to rename your current directory to $pack-$curr_ver now.



Prereq: $prev_ver

EOF

sed -ne '/^diff.*VERSION/,/^+[0-9][0-9]*/ p' $tmp_name >> $diff_name
echo  >> $diff_name
sed -e '/^diff.*VERSION/,/^+[0-9][0-9]*/ d'  $tmp_name >> $diff_name

rm $tmp_name

echo "Signing and compressing patch file"
gpg --clearsign --not-dash-escaped -u 57548DCD \
    < $diff_name | gzip --best > $diff_name.gz
rm $diff_name

echo "Checking patch file"
cd $pack-$prev_ver
zcat ../$diff_name.gz | patch -s -p1
rm $(find . -name "*.orig") 2>/dev/null || true
cd ..

if ! diff -urN "$pack-$prev_ver/" "$pack-$curr_ver/" >/dev/null ; then
   echo "compare failed"
   exit 1
fi

if ! zcat $diff_name.gz | gpg --batch --verify ; then
    exit 1
fi


echo "cleaning up"

rm -rf "$pack-$curr_ver"
rm -rf "$pack-$prev_ver"

echo "Patch file $diff_name.gz is good."