#!/bin/sh -ef
#
# $Id$
# Copyright (C) 2000-2005  Dmitry V. Levin <ldv@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
#

[ -z "$RPM_SCRIPTS_DEBUG" ] || set -x

PROG="${0##*/}"

exit_handler()
{
	local rc=$?
	trap - EXIT
	cat >/dev/null 2>&1
	exit $rc
}

trap exit_handler EXIT

# If using normal root, avoid changing anything.
if [ -z "$(printf %s "$RPM_BUILD_ROOT" |tr -d ' /.')" ]; then
	echo "$PROG: non-/ RPM_BUILD_ROOT expected" >&2
	exit 1
fi

FIND_FILES=
FIND_LIBS=
FIND_PAM=
FIND_PERL=
FIND_PYTHON=
FIND_LIBPERL=
FIND_SHELL=
FIND_TCL=
libperl_so=

ParseMethod()
{
	local t
	for t in "$@"; do
		case "${t/%,}" in
			no|none|off|false)
				FIND_FILES=
				FIND_LIBS=
				FIND_PAM=
				FIND_PERL=
				FIND_PYTHON=
				FIND_LIBPERL=
				FIND_SHELL=
				FIND_TCL=
				;;
			lib|library)
				FIND_LIBS=1
				;;
			libperl)
				FIND_LIBPERL=1
				;;
			nolib|nolibrary)
				FIND_LIBS=
				;;
			nolibperl)
				FIND_LIBPERL=
				;;
			files)
				FIND_FILES=1
				;;
			nofiles)
				FIND_FILES=
				;;
			pam)
				FIND_PAM=1
				;;
			nopam)
				FIND_PAM=
				;;
			perl)
				FIND_PERL=1
				FIND_LIBPERL=1
				;;
			noperl)
				FIND_PERL=
				FIND_LIBPERL=
				;;
			python)
				FIND_PYTHON=1
				;;
			nopython)
				FIND_PYTHON=
				;;
			sh|shell)
				FIND_SHELL=1
				;;
			nosh|noshell)
				FIND_SHELL=
				;;
			tcl)
				FIND_TCL=1
				;;
			notcl)
				FIND_TCL=
				;;
			all)
				FIND_FILES=1
				FIND_LIBS=1
				FIND_PAM=1
				FIND_PYTHON=1
				FIND_PERL=1
				FIND_LIBPERL=1
				FIND_SHELL=1
				FIND_TCL=1
				;;
			default|yes|true)
				ParseMethod $RPM_FINDREQ_DEFAULT_METHOD
				;;
			*)
				echo "Unrecognized find-requires method: $t" >&2
				exit 1
				;;
		esac
	done
}
ParseMethod $RPM_FINDREQ_METHOD

FIND_SCRIPT=
if [ -n "$FIND_PAM" -o -n "$FIND_PERL" -o -n "$FIND_SHELL" -o -n "$FIND_TCL" ]; then
	FIND_SCRIPT=1
fi

if [ -z "$FIND_LIBS" -a -z "$FIND_SCRIPT" -a -z "$FIND_FILES" ]; then
	# Nothing to do
	exit
fi

if [ -n "$*" ]; then
	# We do not handle arguments yet...
	exit
fi

. @RPMCONFIGDIR@/find-package

ulimit -c 0

case "$LD_PRELOAD" in
	*libfakeroot*)
		unset LD_PRELOAD
		;;
	*libbuildreq.so*)
		unset LD_PRELOAD
		;;
esac

FOUND_REQS=
LIST_PERL=
LIST_PYTHON=
LIST_TCL=

ListScriptReqs()
{
	[ -n "$FIND_SCRIPT" ] || return 0

	local f t
	f="$1"
	t="$2"
	if [ -x "$f" ]; then
		local r
		r="$(FindPackage "$f" "$(head -1 "$f" |sed -n 's|^#![[:space:]]*\(/[^[:space:]]\+\).*|\1|p')")" || return 1
		[ -z "$FOUND_REQS" ] && FOUND_REQS="$r" || FOUND_REQS="$FOUND_REQS
$r"
	fi
	if [ -z "${t##*Bourne* shell script text*}" ]; then
		if [ -n "$FIND_SHELL" -a -x "$f" ]; then
			local r
			r="$(@RPMCONFIGDIR@/shell.req "$f")" || return 1
			[ -z "$FOUND_REQS" ] && FOUND_REQS="$r" || FOUND_REQS="$FOUND_REQS
$r"
		fi
	elif [ -z "${t##ASCII *text*}" -a -z "${f%%$RPM_BUILD_ROOT/etc/pam.d/*}" ]; then
		if [ -n "$FIND_PAM" ]; then
			local r
			r="$(@RPMCONFIGDIR@/pam.req "$f")" || return 1
			[ -z "$FOUND_REQS" ] && FOUND_REQS="$r" || FOUND_REQS="$FOUND_REQS
$r"
		fi
	elif [ -z "${t##*perl script text*}" -o -z "${f%%*.p[lmh]}" ]; then
		if [ -n "$FIND_PERL" ]; then
			[ -z "$LIST_PERL" ] && LIST_PERL="$f" || LIST_PERL="$LIST_PERL
$f"
		fi
	elif [ -z "${f%%*.py}" ]; then
		if [ -n "$FIND_PYTHON" ]; then
			[ -z "$LIST_PYTHON" ] && LIST_PYTHON="$f" || LIST_PYTHON="$LIST_PYTHON
$f"
		fi
	elif [ -z "${f%%*.tcl}" ]; then
		if [ -n "$FIND_TCL" ]; then
			[ -z "$LIST_TCL" ] && LIST_TCL="$f" || LIST_TCL="$LIST_TCL
$f"
		fi
	fi
}

FindPerlReqs()
{
	[ -n "$LIST_PERL" ] || return 0

	local r
	r="$(printf %s\\n "$LIST_PERL" |@RPMCONFIGDIR@/perl.req)" || return 1
	[ -z "$FOUND_REQS" ] && FOUND_REQS="$r" || FOUND_REQS="$FOUND_REQS
$r"
}

FindPythonReqs()
{
	[ -n "$LIST_PYTHON" ] || return 0
	[ -x "$RPM_PYTHON" ] || return 0

	local r
	r="$(printf %s\\n "$LIST_PYTHON" |"$RPM_PYTHON" @RPMCONFIGDIR@/python.req.py)" || return 1
	[ -z "$FOUND_REQS" ] && FOUND_REQS="$r" || FOUND_REQS="$FOUND_REQS
$r"
}

FindTclReqs()
{
	[ -n "$LIST_TCL" ] || return 0
	[ -x "$RPM_TCLSH" ] || return 0

	local r
	r="$(printf %s\\n "$LIST_TCL" |@RPMCONFIGDIR@/tcl.req)" || return 1
	[ -z "$FOUND_REQS" ] && FOUND_REQS="$r" || FOUND_REQS="$FOUND_REQS
$r"
}

# Note this works for both a.out and ELF executables.
# It also auto-generates requirements for scripts.

FindLibReqs()
{
	[ -n "$FIND_LIBS" ] || return 0

	local f d braces= suffix=
	f="$1"

	if d="$(objdump -p "$f")"; then 
		# Shared library dependencies, glibc version references.
		suffix="$(printf %s\\n "$d" |sed -ne 's/^.*file format \(elf64\).*$/(64bit)/p')" || return 1
		[ -z "$suffix" ] || braces='()'
		printf %s\\n "$d" |awk "-vsuffix=$suffix" "-vbraces=$braces" '
			BEGIN {start_shared=0; start_version=0; lib_name="";}
			/^($)/ {start_shared=0; start_version=0; lib_name=""; next;}
			/^private/ {start_shared=0; start_version=0; lib_name=""; next;}
			/^Dynamic Section:$/ {start_shared=1; next;}
			/^Version References:$/ {start_version=1; next;}
			(start_version==1) && /^ *required from/ {sub(/:/, "", $3); lib_name=$3; next;}
			(start_shared==1) && /^ *NEEDED/ {print $2 braces suffix; next;}
			(start_version==1) && (lib_name!="") && ($4!="") {print lib_name "(" $4 ")" suffix;}
		'
		if [ -n "$FIND_LIBPERL" -a -z "$libperl_so" -a -z "${f##*/usr/lib/perl?/*/auto/*.so}" ]; then
			libperl_so=`perl -MConfig -e 'print "$Config{libperl}\n"'`
			printf %s\\n "$libperl_so$braces$suffix"
		fi
	fi
}

FindExeReqs()
{
	if [ -x "$1" ]; then
		FindLibReqs "$1"
	fi
}

if [ -n "$RPM_SUBPACKAGE_NAME" ]; then
	if [ -n "${RPM_SUBPACKAGE_NAME%%glibc*}" -a -z "${RPM_SUBPACKAGE_NAME##*-devel-static}" ]; then
		FOUND_REQS=glibc-devel-static
	fi
fi

: ${RPM_FINDREQ_TOPDIR:=}
: ${RPM_FINDREQ_SKIPLIST:=}

while IFS= read -r f; do
	fname="${f#$RPM_BUILD_ROOT}"
	fname="${fname#.}"

	if [ -n "$RPM_FINDREQ_TOPDIR" ] && [ -z "${fname%%$RPM_FINDREQ_TOPDIR/*}" ]; then
		continue;
	fi
	if [ -n "$RPM_FINDREQ_SKIPLIST" ]; then
		for skip in $RPM_FINDREQ_SKIPLIST; do
			if [ -z "${fname##$skip}" ]; then
				continue 2
			fi
		done
	fi
	if [ -n "$FIND_FILES" ]; then
		for p in $(grep '^[^#]' @RPMCONFIGDIR@/files.req.list); do
			if [ -z "${fname%%$p/*}" ]; then
				[ -z "$FOUND_REQS" ] && FOUND_REQS="$p" || FOUND_REQS="$FOUND_REQS
$p"
				break
			fi
		done
	fi
	t="$(file -b "$f")"
	if [ -z "${t##* text*}" ]; then
		ListScriptReqs "$f" "$t"
	elif [ -z "${t##* executable*}" ]; then
		r="$(FindExeReqs "$f")"
		[ -z "$FOUND_REQS" ] && FOUND_REQS="$r" || FOUND_REQS="$FOUND_REQS
$r"
	elif [ -z "${t##* shared object*}" ]; then
		r="$(FindLibReqs "$f")"
		[ -z "$FOUND_REQS" ] && FOUND_REQS="$r" || FOUND_REQS="$FOUND_REQS
$r"
		[ -z "$LIST_PYTHON" ] && LIST_PYTHON="$f" || LIST_PYTHON="$LIST_PYTHON
$f"
	fi
done

# Find requires in listed perl scripts, if any
FindPerlReqs

# Find requires in listed python scripts, if any
FindPythonReqs

# Find requires in listed tcl scripts, if any
FindTclReqs

# Finally sort and print them.
printf %s "$FOUND_REQS" |LC_COLLATE=C sort -u