#!/usr/bin/env bash

set -euo pipefail

# ==========================================
# EspOS OpenRC RootFS Builder
# Debian 13 Trixie + EspOS unstable
# ==========================================


ARCH="amd64"

DEBIAN_SUITE="trixie"
DEBIAN_MIRROR="http://deb.debian.org/debian"

ESPOS_REPO="https://repo.elordenador.org"
ESPOS_SUITE="espos-unstable"

ROOTFS="$(pwd)/rootfs"
OUTPUT="espos-openrc-rootfs.tar.zst"


KEYRING_PACKAGE="espos-archive-keyring"
KEYRING_PATH="/usr/share/keyrings/espos-archive-keyring.gpg"



BASE_PACKAGES="
bash
coreutils
sudo
ca-certificates
locales
tzdata
curl
wget
openssh-server
openrc
dbus
elogind
init-system-helpers
"


ESPOS_PACKAGES="
base-files
"



cleanup()
{
    echo "[+] Cleaning mounts"

    umount -lf "$ROOTFS/dev/pts" 2>/dev/null || true
    umount -lf "$ROOTFS/dev" 2>/dev/null || true
    umount -lf "$ROOTFS/proc" 2>/dev/null || true
    umount -lf "$ROOTFS/sys" 2>/dev/null || true
}


trap cleanup EXIT



echo "[+] Removing previous rootfs"

rm -rf "$ROOTFS"



echo "[+] Creating Debian ${DEBIAN_SUITE} minbase"


debootstrap \
    --variant=minbase \
    --arch="$ARCH" \
    "$DEBIAN_SUITE" \
    "$ROOTFS" \
    "$DEBIAN_MIRROR"



echo "[+] Copy DNS"

cp /etc/resolv.conf "$ROOTFS/etc/resolv.conf"



echo "[+] Mounting filesystems"


mount --bind /dev "$ROOTFS/dev"
mount --bind /dev/pts "$ROOTFS/dev/pts"

mount -t proc proc "$ROOTFS/proc"
mount -t sysfs sys "$ROOTFS/sys"



echo "[+] Installing Debian CA certificates"


chroot "$ROOTFS" apt update

chroot "$ROOTFS" apt install -y \
    ca-certificates



echo "[+] Adding temporary EspOS repository"


cat > "$ROOTFS/etc/apt/sources.list.d/espos.list" <<EOF
deb [trusted=yes] ${ESPOS_REPO} ${ESPOS_SUITE} main
EOF



echo "[+] Updating trusted repository"


chroot "$ROOTFS" apt update



echo "[+] Installing EspOS keyring from repository"


chroot "$ROOTFS" apt install -y \
    "$KEYRING_PACKAGE"



echo "[+] Switching repository to signed-by"


cat > "$ROOTFS/etc/apt/sources.list.d/espos.list" <<EOF
deb [signed-by=${KEYRING_PATH}] ${ESPOS_REPO} ${ESPOS_SUITE} main
EOF



echo "[+] Updating signed repository"


chroot "$ROOTFS" apt update



echo "[+] Blocking systemd"


cat > "$ROOTFS/etc/apt/preferences.d/no-systemd" <<EOF
Package: systemd systemd-sysv libsystemd0
Pin: release *
Pin-Priority: -1
EOF



echo "[+] Installing OpenRC base"


chroot "$ROOTFS" apt install -y \
    $BASE_PACKAGES



echo "[+] Installing EspOS packages"


chroot "$ROOTFS" apt install -y \
    $ESPOS_PACKAGES



echo "[+] Removing systemd leftovers"


chroot "$ROOTFS" apt purge -y \
    systemd \
    systemd-sysv \
    systemd-timesyncd \
    2>/dev/null || true



echo "[+] Setting OpenRC init"


ln -sf /sbin/openrc-init "$ROOTFS/sbin/init"



echo "[+] Hostname"


echo "espos" > "$ROOTFS/etc/hostname"



echo "[+] Locales"


chroot "$ROOTFS" bash -c "
echo 'en_US.UTF-8 UTF-8' > /etc/locale.gen
locale-gen
"
echo "[+] Installing network support..."
chroot "$ROOTFS" apt install -y network-manager dhcpcd


echo "[+] Enabling OpenRC base services"


chroot "$ROOTFS" rc-update add devfs sysinit || true
chroot "$ROOTFS" rc-update add procfs boot || true
chroot "$ROOTFS" rc-update add sysfs boot || true
chroot "$ROOTFS" rc-update add elogind default || true
chroot "$ROOTFS" rc-update add dbus default || true
chroot "$ROOTFS" rc-update add NetworkManager default || true

echo "[+] Installing Linux"
chroot "$ROOTFS" apt install espos-kernel -y

echo "[+] Installing GNOME"
chroot "$ROOTFS" apt install gnome-shell gnome-session gnome-control-center gnome-terminal nautilus mutter -y

echo "[+] Cleaning"


chroot "$ROOTFS" apt clean

rm -rf "$ROOTFS/var/lib/apt/lists/*"
rm -rf "$ROOTFS/tmp/*"


echo "[+] Cleaning mounts before packaging"

umount -lf "$ROOTFS/dev/pts" || true
umount -lf "$ROOTFS/dev" || true
umount -lf "$ROOTFS/proc" || true
umount -lf "$ROOTFS/sys" || true


echo "[+] Calculando tamaño"

SIZE=$(du -sb "$ROOTFS" | cut -f1)
echo "[+] Eliminando anterior ROOTFS"
rm -rvf $OUTPUT
echo "[+] Creando rootfs comprimido"

tar \
    --numeric-owner \
    -C "$ROOTFS" \
    -cf - . \
| pv -s "$SIZE" \
| zstd -19 -T0 -o "$OUTPUT"



echo
echo "====================================="
echo " EspOS rootfs generated"
echo " $OUTPUT"
echo "====================================="