#!/bin/sh
#
# Copyright (c) 2019 David Demelier <markand@malikania.fr>
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#

PKGNAME=busybox
PKGVERSION=1.30.1
PKGREVISION=1
PKGLICENSE="GPLv2"
PKGSUMMARY="swiss army knife for embedded"
PKGWWW="https://busybox.net"
PKGDOWNLOAD="https://busybox.net/downloads/$PKGNAME-$PKGVERSION.tar.bz2"
PKGDEPENDS="linux-headers:build"
PKGOPTIONS="CONFIG IPV6 PAM SELINUX STATIC"
PKGPROTECT="etc/udhcpd.conf"

: ${AR:=llvm-ar}
: ${AS:=llvm-as}
: ${CC:=clang}
: ${CFLAGS:=-O2}
: ${LDFLAGS:=}
: ${NM:=llvm-nm}
: ${OBJCOPY:=llvm-objcopy}
: ${OBJDUMP:=llvm-objdump}
: ${STRIP:=llvm-strip}
: ${CONFIG:=}
: ${IPV6:=yes}
: ${PAM:=no}
: ${SELINUX:=no}
: ${STATIC:=yes}

rm -rf $PKGNAME-$PKGVERSION
tar xvf $PKGNAME-$PKGVERSION.tar.bz2
cd $PKGNAME-$PKGVERSION

#
# Allow user to specify a full config if specified, otherwise change
# package options.
#
if [ -n "$CONFIG" ] && [ -r "$CONFIG" ]; then
	cp $CONFIG .config

	#
	# When specifying a config file, force other selective options
	# to a dummy value to avoid incorrect information in package
	# file.
	#
	IPV6=""
	SELINUX=""
	PAM=""
	STATIC=""
else
	cp ../config .config

	if [ "$SELINUX" = "yes" ]; then
		echo "CONFIG_SELINUX=y" >> .config
		echo "CONFIG_FEATURE_TAR_SELINUX=y" >> .config
		echo "CONFIG_SELINUXENABLED=y" >> .config
	fi

	if [ "$PAM" = "yes" ]; then
		echo "CONFIG_PAM=y" >> .config
	fi

	if [ "$IPV6" != "yes" ]; then
		sed -i -e "/CONFIG_FEATURE_IPV6=y/ s/y/n/" .config
		sed -i -e "/CONFIG_FEATURE_IFUPDOWN_IPV6=y/ s/y/n/" .config
	fi

	if [ "$STATIC" = "yes" ]; then
		echo "CONFIG_STATIC=y" >> .config
	fi
fi

#
# Our start script is located in /etc/rc.init.
# Upstream: rejected a tunable option.
#
sed -i -e 's|/etc/init.d/rcS|/etc/rc.init|' init/init.c

#
# Change the redirection limit which is too small for vpk download.
# Upstream: yes in Git.
#
sed -i -e "/redir_limit = 5/ s/5/16/" networking/wget.c

#
# TODO: this is temporary, to build under clang.
#
# CFLAGS="": fix build under clang by removing all non-standard
# options.
#
# -O0: disable optimizations for the same reasons.
#
# See http://lists.busybox.net/pipermail/busybox/2019-October/087558.html
#
make \
	AR="$AR" \
	AS="$AS" \
	CC="$CC" \
	CFLAGS="-DBB_GLOBAL_CONST=''" \
	HOSTCC="$CC" \
	HOSTCFLAGS="" \
	EXTRA_CFLAGS="$CFLAGS -O0" \
	EXTRA_LDFLAGS="$LDFLAGS" \
	NM="$NM" \
	OBJCOPY="$OBJCOPY" \
	OBJDUMP="$OBJDUMP" \
	STRIP="$STRIP" \
	V=1
install -Dm0755 busybox $DESTDIR/bin/busybox
install -dm0755 $DESTDIR/share/udhcp
install -m0644 examples/udhcp/sample.* $DESTDIR/share/udhcp
install -Dm0644 examples/udhcp/udhcpd.conf $DESTDIR/etc/udhcpd.conf
install -Dm0644 ../busybox.crond $DESTDIR/etc/rc.d/busybox.crond
install -Dm0644 ../busybox.klogd $DESTDIR/etc/rc.d/busybox.klogd
install -Dm0644 ../busybox.mdev $DESTDIR/etc/rc.d/busybox.mdev
install -Dm0644 ../busybox.syslogd $DESTDIR/etc/rc.d/busybox.syslogd

cd ..
rm -rf $PKGNAME-$PKGVERSION