#! /bin/bash
#
# rpm2fpm
#
# by Marcus Habermehl (BMH1980) <bmh1980de@yahoo.de>
#
# Converting rpm archives to a Frugalware fpm archive.

export USE_COLOR="y"

if [ -f /usr/lib/frugalware/fwmakepkg ] ; then
	. /usr/lib/frugalware/fwmakepkg
else
	Fmessage()
	{
		echo "$@"
	}
fi

CURDIR=$(pwd)
CPIOPKG=$(mktemp)
BUILDDIR=$(mktemp -d)

INSTALL=0
REMOVE=0

# Usage informations.
usage()
{
	echo "$1"
	echo "usage: $1 [options]"
	echo "options:"
	echo "  -i, --install install the created fpm package"
	echo "  -r, --remove  delete the rpm package after converting"
	echo
}

# Check the command line.
while (( $# > 1 )) ; do
	case $1 in
		-h|--help)    usage && exit 0 ;;
		-i|--install) INSTALL=1 ;;
		-r|--remove)  REMOVE=1 ;;
		*)            usage && exit 1 ;;
	esac
	shift
done

# Get the absolute path of the given rpm archive.
RPMPKG=$(cd `dirname $1`;echo `pwd`/`basename $1`)

# Create directory structure from the rpm archive.
Fmessage "Creating directories... "
for i in $(rpm -qlp ${RPMPKG}) ; do
	mkdir -p ${BUILDDIR}/$(dirname $i) 2> /dev/null
done

# Convert the rpm archive to a cpio archive.
Fmessage "Converting rpm archive to cpio archive... "
rpm2cpio ${RPMPKG} > ${CPIOPKG} 2> /dev/null

cd ${BUILDDIR}

# Extract the cpio archive.
Fmessage "Extracting cpio archive... "
cpio -ivI ${CPIOPKG} 2> /dev/null

# Creating the .FILELIST for the fpm archive.
Fmessage "Creating .FILELIST... "
find . -mindepth 1 | sed 's|^./||' | sort > ${BUILDDIR}/.FILELIST 2> /dev/null

# Extract needed informations for the fpm archive from the rpm archive.
Fmessage "Getting informations from the rpm archive... "
PKGNAME=$(rpm -q --queryformat=%{name} -p ${RPMPKG})
PKGVER=$(rpm -q --queryformat=%{version}-%{release} -p ${RPMPKG})
PKGDESC=$(rpm -q --queryformat=%{summary} -p ${RPMPKG})
URL=$(rpm -q --queryformat=%{url} -p ${RPMPKG})
LICENSE=$(rpm -q --queryformat=%{license} -p ${RPMPKG})
BUILDDATE=$(python -c "import time; print time.ctime($(rpm -q --queryformat=%{buildtime} -p ${RPMPKG}))")
PACKAGER="rpm2fpm"
SIZE=$(rpm -q --queryformat=%{size} -p ${RPMPKG})
ARCH=$(rpm -q --queryformat=%{arch} -p ${RPMPKG})
GROUP=$(rpm -q --queryformat=%{group} -p ${RPMPKG} | tr [:upper:] [:lower:] | tr / - | tr \  _)

# Write the .PKGINFO file for the fpm archive.
Fmessage "Generating .PKGINFO... "
echo "# Generated by rpm2fpm
# $(LC_ALL=C date)
pkgname = ${PKGNAME}
pkgver = ${PKGVER}
pkgdesc = ${PKGDESC}
url = ${URL}
license = ${LICENSE}
builddate = ${BUILDDATE}
packager = ${PACKAGER}
size = ${SIZE}
arch = ${ARCH}
group = ${GROUP}" > ${BUILDDIR}/.PKGINFO

# Get the dependencies and write they to the .PKGINFO file.
Fmessage "Query dependencies... "
eval "`chkdep -d .`"
for i in ${depends[*]} ; do
	echo "depend = ${i}" >> ${BUILDDIR}/.PKGINFO
done

# Extracting existing install scripts and write them to .INSTALL.
Fmessage "Checking for install scripts... "
post_install="$(rpm -q --queryformat=%{postin} -p ${RPMPKG})"
pre_install="$(rpm -q --queryformat=%{prein} -p ${RPMPKG})"
post_uninstall="$(rpm -q --queryformat=%{postun} -p ${RPMPKG})"
pre_uninstall="$(rpm -q --queryformat=%{preun} -p ${RPMPKG})"
if [[ ${post_install} != \(none\) ]] ; then
	echo -e "post_install(){ ${post_install}\n}" >> ${BUILDDIR}/.INSTALL
fi
if [[ ${pre_install} != \(none\) ]] ; then
	echo -e "pre_install(){ ${pre_install}\n}" >> ${BUILDDIR}/.INSTALL
fi
if [[ ${post_uninstall} != \(none\) ]] ; then
	echo -e "post_uninstall(){ ${post_uninstall}\n}" >> ${BUILDDIR}/.INSTALL
fi
if [[ ${pre_uninstall} != \(none\) ]] ; then
	echo -e "pre_uninstall(){ ${pre_uninstall}\n}" >> ${BUILDDIR}/.INSTALL
fi

# Compressing the files.
FPMPKG=${CURDIR}/${PKGNAME}-${PKGVER}-${ARCH}.fpm
Fmessage "Creating fpm archive $(basename ${FPMPKG})... "
cd ${BUILDDIR}
if [ -f ${BUILDDIR}/.INSTALL ]; then
	tar -cvjf ${FPMPKG} .PKGINFO .FILELIST .INSTALL * 2> /dev/null > /dev/null
else
	tar -cvjf ${FPMPKG} .PKGINFO .FILELIST * 2> /dev/null > /dev/null
fi

cd ${CURDIR}

# Removing temporary build directory.
Fmessage "Removing build dir... "
rm -fr ${BUILDDIR} ${CPIOPKG} 2> /dev/null

# Remove the rpm archive.
if (( ${REMOVE} == 1 )) ; then
	Fmessage "Removing ${RPMPKG}... "
	rm -f ${RPMPKG} 2> /dev/null
fi

# Install the fpm archive.
if (( ${INSTALL} == 1 )) ; then
	su -c "pacman -A ${FPMPKG}"
fi

exit 0