set -ex -o pipefail

mkdir -p $out
mkdir -p $out/etc/repart.d $out/dev $out/proc $out/sys $out/tmp $out/root $out/run $out/boot
ln -sf ../usr/bin $out/bin
ln -sf ../usr/bin $out/sbin
ln -sf ../usr/lib $out/lib
ln -sf ../usr/lib $out/lib64
ln -sf ../proc/self/mounts $out/etc/mtab

### install systemd
echo "Installing systemd"
cp -Pr $systemd/* $out/
find $out -type d -exec chmod 755 {} \;
rm -rf $out/usr/include
rm -rf $out/usr/sbin
rm -f $out/usr/lib/systemd/system/sysinit.target.wants/systemd-firstboot.service
# remove vconsole setup
rm -f $out/usr/lib/udev/rules.d/90-vconsole.rules

cat <<EOF > $out/etc/os-release
NAME=PatOS
PRETTY_NAME=PatOS 0.0.1 (pre-alpha)
IMAGE_ID=patos
ID=patos
IMAGE_VERSION=0.0.1
VERSION=0.0.1
VERSION_ID=0.0.1
BUILD_ID=0.0.1
EOF

sed -i 's#After=\(.*\)#After=sysroot.mount \1#' $out/usr/lib/systemd/system/systemd-repart.service
cat <<EOF > $out/etc/repart.d/10-esp.conf
[Partition]
Type=esp
Format=vfat
EOF

cat <<EOF > $out/etc/repart.d/22-root.conf
[Partition]
Type=root
EOF

#FIXME: use btrfs instead on ext2(busybox) but need the btrfs tools in rootfs.
cat <<EOF > $out/etc/repart.d/40-var.conf
[Partition]
Type=var
UUID=4d21b016-b534-45c2-a9fb-5c16e091fd2d
Format=ext2
Label=patos-state
Minimize=off
FactoryReset=yes
SizeMinBytes=1G
SplitName=-
EOF

### install PatOS glibc
cp -P $glibcPatos/lib/*.so* $out/usr/lib/

### install kernel modules
cp -r $kernel/lib/modules $out/usr/lib/
find $out/usr/lib/modules -type d -exec chmod 755 {} \;

### install busybox
cp $busybox/bin/busybox $out/usr/bin/
$out/usr/bin/busybox --list | xargs -I {} ln -sf busybox $out/usr/bin/{}

### install dbus broker
cp -r $dbusBroker/* $out/

### install lib kmod
cp -P $kmodLibs/lib/* $out/usr/lib
cp -P $kmodBin/bin/* $out/usr/bin

### install libbpf
cp -P $libbpf/lib/libbpf* $out/usr/lib

### Find and install all shared libs
find $out -type f -executable -exec ldd {} \; | awk '{print $3}' | grep -v systemd | grep -v glibc | sort -u | xargs cp -t $out/usr/lib
find $out -type f -executable -exec chmod 755 {} \;

# FIXME: ELF patching. Is there a better way?
find $out -type f -executable -exec patchelf --set-rpath /lib:/usr/lib:/usr/lib/systemd {} \;
find $out -type f -executable -exec patchelf --set-interpreter /lib/ld-linux-x86-64.so.2 {} \;
patchelf --remove-rpath $out/usr/lib/ld-linux-x86-64.so.2

# strip binaries
find $out -type f -executable -exec strip {} \;
find $out -type d -exec chmod 755 {} \;