#!/bin/sh
#
# syspkgdeps [-a arch] [-m machine] [-s setsdir] [-p prefix] sets
#
# Compute naive package dependencies based on file & directory
# nesting. E.g., if pkg P contains /foo/bar and Q contains /foo,
# then Q is considered a dependency of P.
#

#set -u

#
# set defaults and import setlist subroutines
#
rundir="$(dirname "$0")" # ${0%/*} isn't good enough when there's no "/"
. "${rundir}/sets.subr"


usage()
{
	cat 1>&2 <<USAGE
Usage: ${0##*/} [-a arch] [-m machine] [-s setsdir] [-p prefix] setname [...]
	-a arch		set arch (e.g, m68k, mips, powerpc)	[${MACHINE_ARCH}]
	-m machine	set machine (e.g, amiga, i386, macppc)	[${MACHINE}]
	-s setsdir	directory to find sets			[${setsdir}]
	-p prefix	prefix for created plist		[${prefix}]
	setname [...]	sets to find dependencies for
USAGE
	exit 1
}

# parse arguments
while getopts a:m:ps: ch; do
	case ${ch} in
	a)
		MACHINE_ARCH="${OPTARG}"
		MACHINE_CPU="$(arch_to_cpu "${OPTARG}")"
		;;
	m)
		MACHINE="${OPTARG}"
		;;
	p)
		prefix="${OPTARG}"
		;;
	s)
		setsdir="${OPTARG}"
		;;
	*)
		usage
		;;
	esac
done
shift $((${OPTIND} - 1))
if [ $# -lt 1 ]; then
	usage
fi

sets="$*"

# TBD clean up
SCRATCH="$(${MKTEMP} -d "/var/tmp/${0##*/}.XXXXXX")"

[ $? -ne 0 ] && { echo "Could not create scratch directory." 1>&2 ; exit 1 ; }

PATH_MEMBERSHIP="${SCRATCH}/path-membership"
PATH_TO_PKGNAME="${SCRATCH}/pathpkg.db"
PARENT_PKGNAMES="${SCRATCH}/parent-pkgnames"
PARENT_PATHNAMES="${SCRATCH}/parent-pathnames"

echo "indexing packages by pathnames" 1>&2

list_set_files ${sets} | ${SED} 's/^\.\///' | \
${ENV_CMD} PREFIX="${prefix}" ${AWK} '{
	if ($1 == ".") {
		print ENVIRON["PREFIX"] " " $2;
	} else {
		print ENVIRON["PREFIX"] $1 " " $2;
	}
}' | ${SORT} -k 1 -u > "${PATH_MEMBERSHIP}"

${DB} -q -w -f - btree "${PATH_TO_PKGNAME}" < "${PATH_MEMBERSHIP}" || \
	echo "shit" 1>&2

echo "computing parent pathnames" 1>&2

while read pathname pkgname; do
	# print parent pathname
	echo "${pathname%/*}"
done < "${PATH_MEMBERSHIP}" > "${PARENT_PATHNAMES}"

echo "selecting parent packages using parent pathnames" 1>&2

${DB} -q -f - btree "${PATH_TO_PKGNAME}" < "${PARENT_PATHNAMES}" | \
	${PASTE} "${PATH_MEMBERSHIP}" - | \
	${AWK} '{ if ($2 != $4) print $2 " " $4; }' | \
	${SORT} -u | \
	"${rundir}/culldeps"

if [ $? -ne 0 ]; then
	echo "error in parent-directory lookup, aborting" 1>&2
	exit 1
fi