#!/bin/sh -efu
#
# Copyright (C) 2000-2006  Dmitry V. Levin <ldv@altlinux.org>
# Copyright (C) 2007       Alexey Tourbin <at@altlinux.org>
#
# find-requires - generate list of linux-specific package requires.
# Inspired by tool with same name from RPM distribution.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#

. @RPMCONFIGDIR@/functions
ValidateBuildRoot

workdir=
exit_handler()
{
	local rc=$?
	trap - EXIT
	[ -z "$workdir" ] || rm -rf "$workdir"
	cat >/dev/null
	exit $rc
}

trap exit_handler EXIT HUP INT QUIT PIPE TERM

methods=$(SetupMethods req "$RPM_FINDREQ_METHOD")
if [ -z "$methods" ]; then
	Info "AutoReq disabled, nothing to do"
	exit 0
fi

workdir=$(mktemp -dt "$PROG".XXXXXXXX)

# filter file list through TOPDIR and SKIPLIST patterns
while IFS= read -r f; do
	fname="${f#$RPM_BUILD_ROOT}"
	printf '%s\n' "$fname" >&3
	if [ -n "${RPM_FINDREQ_TOPDIR-}" ] && [ -z "${fname%%$RPM_FINDREQ_TOPDIR/*}" ]; then
		Debug "skip $f due to RPM_FINDREQ_TOPDIR=$RPM_FINDREQ_TOPDIR"
		continue
	fi
	if [ -n "${RPM_FINDREQ_SKIPLIST-}" ]; then
		for skip in $RPM_FINDREQ_SKIPLIST; do
			if [ -z "${fname##$skip}" ]; then
				Debug "skip $f due to RPM_FINDREQ_SKIPLIST pattern $skip"
				continue 2
			fi
		done
	fi
	# absolute symbolic links should not be passed down to file(1)
	if [ -L "$f" ]; then
		to="$(readlink "$f")"
		if [ -n "$to" -a -z "${to##/*}" ]; then
			if [ -e "$f" ]; then
				printf '%s\t symbolic link to `%s'\''\n' "$f" "$to"
			else
				printf '%s\t broken symbolic link to `%s'\''\n' "$f" "$to"
			fi
			continue
		fi >&4
	fi
	printf '%s\n' "$f"
done >"$workdir"/files 3>"$RPM_BUILD_ROOT/.files:$RPM_SUBPACKAGE_NAME" 4>"$workdir"/files+types

if ! [ -s "$workdir"/files ]; then
	Info "empty file list, nothing to do"
	exit 0
fi

# filter file list through file(1) to append types
if ! file -NF$'\t' -f "$workdir"/files >>"$workdir"/files+types; then
	sed -n '/\t *ERROR:/p' "$workdir"/files+types >&2
	exit 1
fi

found=
RunMethod()
{
	local exe="$1"; shift
	local filter="$exe".files
	if ! [ -x "$filter" ]; then
		# XXX should be Fatal
		Info "$filter not available"
		return
	fi
	local filelist="$workdir/${exe##*/}".files
	local deplist="$workdir/${exe##*/}".deps
	Debug "running $filter"
	"$filter" <"$workdir"/files+types >"$filelist" ||
		Fatal "$filter failed"
	Verbose "$filter: $(wc -l <"$filelist") files"
	[ -s "$filelist" ] || return 0
	# XXX validate $filelist
	Debug "running $exe"
	"$exe" <"$filelist" >"$deplist" ||
		Fatal "$exe failed"
	if [ -s "$deplist" ]; then
		LC_COLLATE=C sort -u -o "$deplist" "$deplist"
		Verbose "$exe: $(wc -l <"$deplist") dependencies"
		found=1
	else
		rm -f "$deplist"
	fi
}

export RPM_FINDPACKAGE_COMMANDS_LOG="$RPM_BUILD_ROOT"/.findpackage-commands
>"$RPM_FINDPACKAGE_COMMANDS_LOG"

Info "running scripts ($methods)"
RunMethods req "$methods" RunMethod

if [ -n "$found" ]; then
	(set +f && LC_ALL=C sort -u -m "$workdir"/*.deps) >"$workdir"/find-requires-deps || false
	if [ -n "${RPM_FIND_REQUIRES_FILTER-}" ]; then
		(eval "set -x; $RPM_FIND_REQUIRES_FILTER") <"$workdir"/find-requires-deps >"$workdir"/filter-requires-deps
		[ $? = 0 ] || Fatal "filter failed"
		(cd "$workdir" && diff -U1 find-requires-deps filter-requires-deps) >&2 ||:
		cat "$workdir"/filter-requires-deps
	else
		cat "$workdir"/find-requires-deps
	fi
fi

if [ -s "$RPM_FINDPACKAGE_COMMANDS_LOG" ]; then
	LC_ALL=C sort -u -o "$RPM_FINDPACKAGE_COMMANDS_LOG"{,}
	Info "FINDPACKAGE-COMMANDS:" $(cat <"$RPM_FINDPACKAGE_COMMANDS_LOG")
fi