#!/bin/sh

##############################################################
# Copyright (C) 2002 Stewart Allen <stewart@neuron.com>      #
# Licensed under the terms of the GNU Public License V2      #
#                                                            #
# dir-to-rpm: converts a directory structure into an         #
# installable RPM image. basically, it's a glorified tar.    #
# the real utility in this is the ability to create images   #
# that are easy to install/uninstall without all the hassles #
# of creating a formal source RPM.                           #
#                                                            #
# to endow your RPM with personalized settings, put them in  #
# the ${HOME}/.rpmmacros configuration file (like this):     #
#                                                            #
# %packager       Me Myself and I                            #
# %distribution   My Linux Distro                            #
# %vendor         TarPM Universal Widgets                    #
##############################################################

CALL=$(basename ${0})

function usage {
	echo "usage: ${CALL} [OPTION]... <name> <dir> [rpmbuild args]"
	if [ "$1" != "long" ]; then
		echo "try '${CALL} --help' for more options"
		exit 1
	fi
	echo ""
	echo "  <name>              base name of rpm"
	echo "  <dir>               base directory for files"
	echo "  -h  --help          this help message"
	echo "  -V  --version=#     rpm version # (default 1)"
	echo "  -R  --release=#     rpm release # (default 1)"
	echo "  -d  --desc=STR      a brief description"
	echo "  -r  --root=<dir>    root of files inside 'dir'"
	echo "  -o  --out           output directory or file"
	echo "  [rpmbuild args]     optional list of rpmbuild arguments"
	echo ""
	echo "report bugs to stewart@neuron.com"
	exit 1
}

function error {
	echo "error: $@"
	exit 1
}

version=1
release=1
out=$(pwd)
root=/

for i in "$@"; do
	case "$i" in
		--version=*) version=${i/--version=/}; shift ;;
		--release=*) release=${i/--release=/}; shift ;;
		--desc=*) desc=${i/--desc=/}; shift ;;
		--root=*) root=${i/--root=/}; shift ;;
		--out=*) out=${i/--out=/}; shift ;;
		-V) shift; version=${1}; shift ;;
		-R) shift; release=${1}; shift ;;
		-d) shift; desc=${1}; shift ;;
		-r) shift; root=${1}; shift ;;
		-o) shift; out=${1}; shift ;;
		--help|-h) usage long ;;
	esac
done

name=$1
dir=$2

shift
shift

test "${dir}" = "" && usage
test "${name}" = "" && usage
test "${dir/\/*/XXX}" = "XXX" || error "directory path must be absolute"
test -d "${dir}" || error "'${dir}' missing or not a directory"

tmpdir=$(mktemp -d /tmp/dir2rpmXXXXXX)
rpmtop=${tmpdir}/rpms
outdir=${tmpdir}/rpm.dir
specfl=${tmpdir}/rpm.spec
macrfl=${tmpdir}/rpm.macros
rpmlog=${tmpdir}/rpm.log

mkdir -p ${rpmtop}

cat > ${specfl} << EOF
Summary: ${desc:-${name}-${version}-${release}}
Name: ${name}
Version: ${version}
Release: ${release}
Copyright: Unknown
Group: TarPMs
BuildRoot: ${dir}
AutoReqProv: no
Prefix: ${root}
%undefine __check_files
%define _topdir ${rpmtop}
%define _rpmdir ${tmpdir}
%define _builddir ${tmpdir}
%prep
echo "%_target_cpu" > ${outdir}
%description
${desc}
%files
%defattr(-,root,root)
${root}
EOF

rpmbuild -bb ${specfl} $@ &> ${rpmlog} &&
mv ${tmpdir}/$(cat ${outdir})/*.rpm ${out} &&
rm -rf ${tmpdir} ||
( find ${tmpdir} && error "Build Error" )