#!/bin/bash

# Copyright 2008, 2009, 2010, 2018, 2022  Patrick J. Volkerding, Sebeka, Minnesota, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

cd $(dirname $0) ; CWD=$(pwd)

PKGNAM=rpm2tgz
VERSION=1.2.2
BUILD=${BUILD:-6}

# Automatically determine the architecture we're building on:
if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) export ARCH=i586 ;;
    arm*) export ARCH=arm ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
       *) export ARCH=$( uname -m ) ;;
  esac
fi

# If the variable PRINT_PACKAGE_NAME is set, then this script will report what
# the name of the created package would be, and then exit. This information
# could be useful to other scripts.
if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
  echo "$PKGNAM-$VERSION-$ARCH-$BUILD.txz"
  exit 0
fi

TMP=${TMP:-/tmp}
PKG=$TMP/package-rpm2tgz

rm -rf $PKG
mkdir -p $TMP $PKG

echo "+===========+"
echo "| rpm2targz |"
echo "+===========+"
cd $TMP
mkdir -p $PKG/usr/bin
cc -o $PKG/usr/bin/rpmoffset $CWD/rpmoffset.c
cat $CWD/rpm2targz > $PKG/usr/bin/rpm2targz

# Apply some patches:
( cd $PKG/usr/bin
  # These are all against "rpm2tgz", so mv it until we are done patching:
  mv rpm2targz rpm2tgz
  zcat $CWD/patches/0001-fix-d-handling.patch.gz | patch -p1 || exit 1
  zcat $CWD/patches/0002-fix-spurious-path-to-rpm-file-with-n-option.patch.gz | patch -p1 || exit 1
  zcat $CWD/patches/0003-allow-every-user-to-use-rpm2tgz.patch.gz | patch -p1 || exit 1
  zcat $CWD/patches/0004-produce-more-compliant-slack-desc.patch.gz | patch -p1 || exit 1
  # Not applied.  Rationale:  We do not want to alter the files in the RPM.
  #zcat $CWD/patches/0005-gzip-man-info-pages.patch.gz | patch -p1 || exit 1
  # Not applied.  Rationale:  .tgz works with all versions of Slackware.
  # Translated RPMs may be targeting systems with no .txz support.
  #zcat $CWD/patches/0006-should-we-use-.txz-format-in-slackware-current.patch.gz | patch -p1 || exit 1
  # OK, I will take this version of the patch, as it doesn't change the
  # default behaviour of rpm2tgz.
  # mv the script back (wow, this is rather random ;-)
  mv rpm2tgz rpm2targz
  zcat $CWD/patches/0007-Add-support-for-.txz-packages-and-rpm2txz-symlink.patch.gz | patch -p1 || exit 1
  zcat $CWD/patches/0008-Avoid-none-values-in-slack-desc.patch.gz | patch -p1 || exit 1
  zcat $CWD/patches/0009-Add-c-option-just-as-makepkg-c-y.patch.gz | patch -p1 || exit 1
  ## NO - cpio is stupid and strips the leading '/' from symlinks to absolute
  ## paths with --no-absolute-filenames. :-/
  ## Make sure that if someone created an RPM with absolute filenames that we
  ## don't allow it to write all over the / directory when we're just trying
  ## to extract it to make the .tgz:
  #zcat $CWD/patches/0010-no-absolute-filenames-extracting-cpio.patch.gz | patch -p1 || exit 1
  # Allow ignoring rpm2cpio error code. Some RPMs can be extracted, but
  # throw an error anyway.
  zcat $CWD/patches/0011-ignore-rpm2cpio-error-code.patch.gz | patch -p1 || exit 1
) || exit 1

( cd $PKG/usr/bin ; ln -sf rpm2targz rpm2tgz )
( cd $PKG/usr/bin ; ln -sf rpm2targz rpm2txz )

chmod 755 $PKG/usr/bin/{rpmoffset,rpm2targz}
mkdir -p $PKG/usr/doc/rpm2targz
cp -a $CWD/rpm2targz.README $PKG/usr/doc/rpm2targz/rpm2targz.README
chown root:root $PKG/usr/doc/rpm2targz/rpm2targz.README
chmod 644 $PKG/usr/doc/rpm2targz/rpm2targz.README
( cd $PKG
  find . | xargs file | grep "executable" | grep ELF | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null
  find . | xargs file | grep "shared object" | grep ELF | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null
)

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

# Build the package:
cd $PKG
makepkg -l y -c n $TMP/rpm2tgz-$VERSION-$ARCH-$BUILD.txz