#!/bin/bash

if [ $(id -u) != 0 ]; then
	echo "$0 script need to run as root!"
	exit 1
fi

LFS=/mnt/lfs

lfs_dirs() {
	mkdir -pv $LFS/{dev,proc,sys,run}
	mknod -m 600 $LFS/dev/console c 5 1
	mknod -m 666 $LFS/dev/null c 1 3

	mkdir -pv $LFS/{bin,boot,etc/{opt,sysconfig},home,lib/firmware,mnt,opt}
	mkdir -pv $LFS/{media/{floppy,cdrom},sbin,srv,var}
	install -dv -m 0750 $LFS/root
	install -dv -m 1777 $LFS/tmp $LFS/var/tmp
	mkdir -pv $LFS/usr/{,local/}{bin,include,lib,sbin,src}
	mkdir -pv $LFS/usr/{,local/}share/{color,dict,doc,info,locale,man}
	mkdir -v  $LFS/usr/{,local/}share/{misc,terminfo,zoneinfo}
	mkdir -v  $LFS/usr/libexec
	mkdir -pv $LFS/usr/{,local/}share/man/man{1..8}

	case $(uname -m) in
	 x86_64) mkdir -v $LFS/lib64 ;;
	esac

	mkdir -v $LFS/var/{log,mail,spool}
	ln -sv /run $LFS/var/run
	ln -sv /run/lock $LFS/var/lock
	mkdir -pv $LFS/var/{opt,cache,lib/{color,misc,locate},local}

	ln -sv /tools/bin/{bash,cat,dd,echo,ln,pwd,rm,stty} $LFS/bin
	ln -sv /tools/bin/{env,install,perl} $LFS/usr/bin
	ln -sv /tools/lib/libgcc_s.so{,.1} $LFS/usr/lib
	ln -sv /tools/lib/libstdc++.{a,so{,.6}} $LFS/usr/lib
	for lib in blkid lzma mount uuid
	do
		ln -sv /tools/lib/lib$lib.so* $LFS/usr/lib
	done
	ln -svf /tools/include/blkid    $LFS/usr/include
	ln -svf /tools/include/libmount $LFS/usr/include
	ln -svf /tools/include/uuid     $LFS/usr/include
	install -vdm755 $LFS/usr/lib/pkgconfig
	for pc in blkid mount uuid
	do
		sed 's@tools@usr@g' /tools/lib/pkgconfig/${pc}.pc \
			> $LFS/usr/lib/pkgconfig/${pc}.pc
	done
	ln -sv bash $LFS/bin/sh

	ln -sv /proc/self/mounts $LFS/etc/mtab

	cat > $LFS/etc/passwd << "EOF"
root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/dev/null:/bin/false
daemon:x:6:6:Daemon User:/dev/null:/bin/false
messagebus:x:18:18:D-Bus Message Daemon User:/var/run/dbus:/bin/false
nobody:x:99:99:Unprivileged User:/dev/null:/bin/false
EOF

	cat > $LFS/etc/group << "EOF"
root:x:0:
bin:x:1:daemon
sys:x:2:
kmem:x:3:
tape:x:4:
tty:x:5:
daemon:x:6:
floppy:x:7:
disk:x:8:
lp:x:9:
dialout:x:10:
audio:x:11:
video:x:12:
utmp:x:13:
usb:x:14:
cdrom:x:15:
adm:x:16:
messagebus:x:18:
systemd-journal:x:23:
input:x:24:
mail:x:34:
nogroup:x:99:
users:x:999:
EOF

	touch $LFS/var/log/{btmp,lastlog,faillog,wtmp}
	chgrp -v utmp $LFS/var/log/lastlog
	chmod -v 664  $LFS/var/log/lastlog
	chmod -v 600  $LFS/var/log/btmp
	
	mkdir -p $LFS/etc/pkg $LFS/var/lib/pkg $LFS/var/lib/pkg/sources $LFS/usr/pkgscripts
	touch $LFS/var/lib/pkg/db
	[ -d toolchain/src ] && cp -Rv toolchain/src/* $LFS/var/lib/pkg/sources
}

mount_pseudo() {
	mount --bind /dev $LFS/dev
	mount -t devpts devpts $LFS/dev/pts -o gid=5,mode=620
	mount -t proc proc $LFS/proc
	mount -t sysfs sysfs $LFS/sys
	mount -t tmpfs tmpfs $LFS/run
	if [ -h $LFS/dev/shm ]; then
	  mkdir -p $LFS/$(readlink $LFS/dev/shm)
	fi
}

umount_pseudo() {
	umount $LFS/dev/pts
	umount $LFS/dev
	umount $LFS/run
	umount $LFS/proc
	umount $LFS/sys
}

runchroot() {
	pushd $LFS &>/dev/null
	mount_pseudo
	cp -L /etc/resolv.conf $LFS/etc/
	chroot "$LFS" /usr/bin/env -i          \
	HOME=/root TERM="$TERM"            \
	PS1='(lfs chroot) \u:\w\$ '        \
	PATH=/bin:/usr/bin:/sbin:/usr/sbin \
	/bin/bash $@
	retval=$?
	umount_pseudo
	popd &>/dev/null
	return $retval
}

runinchroot() {
	pushd $LFS &>/dev/null
	mount_pseudo
	cp -L /etc/resolv.conf $LFS/etc/
	chroot "$LFS" /tools/bin/env -i \
	    HOME=/root                  \
	    TERM="$TERM"                \
	    PS1='(lfs chroot) \u:\w\$ ' \
	    PATH=/bin:/usr/bin:/sbin:/usr/sbin:/tools/bin \
	    bash $@
	retval=$?
	umount_pseudo
	popd &>/dev/null
	return $retval
}

interrupted() {
	die "Abort by user."
}

die() {
	[ "$@" ] && printerror $@
	umount_pseudo
	exit 1
}

printerror() {
	echo -e "ERROR: $@"
}

trap "interrupted" SIGHUP SIGINT SIGQUIT SIGTERM

PKGS="linux-api-headers man-pages glibc zlib file readline m4 bc binutils gmp mpfr mpc shadow gcc bzip2
pkg-config ncurses attr acl libcap sed psmisc iana-etc bison flex grep bash libtool gdbm gperf expat inetutils perl perl-xml-parser
intltool autoconf automake xz kmod gettext libelf libffi openssl python3 ninja meson procps-ng e2fsprogs coreutils check diffutils
gawk findutils groff grub less gzip iproute2 kbd libpipeline make patch sysklogd sysvinit eudev util-linux man-db tar texinfo vim
cpio mkinitramfs linux lfs-bootscripts lfs-files libtasn1 p11-kit make-ca wget"

EXTRA_PKGS="dhcpcd libnl wpa_supplicant"

if [ ! -f $LFS/var/lib/pkg/db ]; then
	lfs_dirs
fi
	
mkdir -p $LFS/usr/pkgscripts/
cp lfs/pkgscripts/* $LFS/usr/pkgscripts/
cp lfs/functions $LFS/var/lib/pkg/
cp lfs/pkg.conf $LFS/etc/pkg/

for i in $PKGS; do
	if [[ $(grep "^$i " $LFS/var/lib/pkg/db) ]]; then
		echo "--- $i skipped ---"
	else
		echo "*** $i ***"
		runinchroot /usr/pkgscripts/$i || die "$i build error!"
	fi
done

for i in $EXTRA_PKGS; do
	if [[ $(grep "^$i " $LFS/var/lib/pkg/db) ]]; then
		echo "--- $i skipped ---"
	else
		echo "*** $i ***"
		runchroot /usr/pkgscripts/$i || die "$i build error!"
	fi
done

exit 0