mkdiff

#!/bin/sh

signing_key="0x4F25E3B6"
signing_options=" --digest-algo SHA384"
opt_sign=yes
ext=bz2
extz=j
opt_with_po=no
if [ "$1" = "--gzip-source" ]; then
  ext=gz
  extz=z
  shift
fi
if [ "$1" = "--no-sign" ]; then
  opt_sign=no
  shift
fi
if [ "$1" = "--with-po" ]; then
  opt_with_po=yes
  shift
fi

if [ $# = 1 ]; then
    pack="$1"
    vprf=""
elif [ $# = 2 ] ; then
    pack="$1"
    vprf="$2"
else
    echo "usage: mkdiff [--no-sign] [--with-po] package-name [version-prefix]" >&2
    exit 1
fi

set -e

curr_ver=$(ls $pack-${vprf}*.tar.${ext} 2>/dev/null | sed "s/^$pack-\(.*\)\.tar\.${ext}/\1/"\
	   | sort -r -t '.' -n -k 1,1 -k 2,2 -k 3,3 -k 4,4 | head -1 )
if [ ! -f $pack-$curr_ver.tar.$ext ]; then
    echo "mkdiff: no current version of package $pack found" >&2
    exit 1
fi
prev_ver=$(ls $pack-${vprf}*.tar.${ext} 2>/dev/null | sed "s/^$pack-\(.*\)\.tar\.${ext}/\1/"\
	   | sort -r -t '.' -n -k 1,1 -k 2,2 -k 3,3 -k 4,4 | head -2 | tail -1 )
if [ "$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"
[ $opt_sign != yes ] && echo "signing disabled"

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 x${extz}f "$pack-$curr_ver.tar.$ext"
tar x${extz}f "$pack-$prev_ver.tar.$ext"
# We remove some files from the directories because we assume
# that they are either binary or can be build using the proper tools:
#  .tlb - Windows  Type Library
#  .dvi
#  .ps
#  .eps
#  .pdf
#  .gmo - compiled gettext files
#  .der - DER encoded test stuff
#  .ber - BER encoded test stuff
#  .png
#  .jpg
tmp="dvi ps eps pdf gmo der ber png jpg"
find_args="-type f -name *.tlb -or -name *.info -or -name *.info-[0-9]"
for i in dvi ps eps pdf gmo der ber png jpg; do
    find_args="$find_args -or -name *.$i"
done
[ $opt_with_po = no ] && find_args="$find_args -or -name *.po -or -name *.pot"
find $pack-${curr_ver} $pack-${prev_ver} `echo $find_args` 2>/dev/null \
     | xargs rm -f 2>/dev/null || true


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

LC_ALL=C TZ=UTC0 diff -urpP "$pack-$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:

  bzcat somepath/$pack-$prev_ver-$curr_ver.diff.bz2 | gpg --verify

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

  bzcat somepath/$pack-$prev_ver-$curr_ver.diff.bz2 | gpg | 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
awk '/^diff.*\/VERSION/ {x=1; print; next}; /^diff.*/ && x == 1 {x = 2}; x == 1 {print}' $tmp_name >> $diff_name
awk '/^diff.*\/VERSION/ {x=1; next}; /^diff.*/ && x == 1 {x = 2; print}; x != 1 {print}' $tmp_name >> $diff_name


rm $tmp_name

if [ $opt_sign = yes ]; then
echo "Signing and compressing patch file"
gpg2 --clearsign --not-dash-escaped -u $signing_key $signing_options \
    < $diff_name | bzip2 --best > $diff_name.bz2
else
echo "compressing patch file"
cat $diff_name | bzip2 --best > $diff_name.bz2
fi
rm $diff_name

echo "Checking patch file"
cd $pack-$prev_ver
bzcat ../$diff_name.bz2 | patch -s -p1
rm $(find . -name "*.orig") 2>/dev/null || true
cd ..

if ! diff -urP "$pack-$prev_ver/" "$pack-$curr_ver/" >/dev/null ; then
   echo "compare failed"

   while :; do
     echo "what shall we do: (v)iew, (i)gnore, (a)bort ?" >&2
     read
     case "$REPLY" in
       v|V)
          diff -urP "$pack-$prev_ver/" "$pack-$curr_ver/" | less
	  ;;
       i|I)
          break
	  ;;
       a|A)
          exit 1
	  ;;
     esac
   done
fi

if [ $opt_sign = yes ]; then
if ! bzcat $diff_name.bz2 | gpg2 --batch --verify ; then
    exit 1
fi
fi

echo "cleaning up"

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

echo "Patch file $diff_name.bz2 is good."