#!/usr/bin/env sh
# build-root.sh — build a full Keru rootfs from scratch using Kama
#
# Given a make.conf (or the profile default), this:
#   1. bootstraps the minimal toolchain (host -> cross/self)
#   2. installs the base package set into $ROOT via Kama
#   3. applies profile choices (init, libc, fs, net)
#
# This is the "fully from scratch" path — no binary base image is seeded.

set -eu
. "$(dirname "$0")/common.sh"

# the target rootfs is the "$ROOT" from make.conf; default it here
ROOT="${ROOT:-/tmp/keru/root}"
MAKE_CONF="${1:-$KERU_ROOT/profile/make.conf}"
[ -f "$MAKE_CONF" ] || die "make.conf not found: $MAKE_CONF"
. "$MAKE_CONF"
ROOT="${ROOT:-/tmp/keru/root}"

KAMA="$KAMA_DIR/kama"
[ -x "$KAMA" ] || die "kama not found at $KAMA (clone the kama repo or set KAMA_DIR)"
[ -d "$PKGS_DIR" ] || die "kama-packages repo not found at $PKGS_DIR (set PKGS_DIR)"

info "building Keru rootfs into $ROOT"
info "profile: init=$INIT libc=$LIBC fs=$TARGET_FS kernel=$KERNEL sudo=$SUDO"

# stage 0 — bootstrap toolchain
info "stage 0: bootstrap toolchain (gcc binutils glibc/musl)"
for p in binutils gcc "$LIBC" toolchain; do
    PKGDIR="$PKGS_DIR" "$KAMA" make "$p" || die "toolchain stage failed on $p"
done

# stage 1 — base system
info "stage 1: base system"
for p in "${BASE_PACKAGES[@]}"; do
    PKGDIR="$PKGS_DIR" "$KAMA" make "$p" || die "base stage failed on $p"
done

# stage 2 — kernel + init + swappables
info "stage 2: kernel + init + sudo + net"
PKGDIR="$PKGS_DIR" "$KAMA" make "$KERNEL" || die "kernel build failed"
PKGDIR="$PKGS_DIR" "$KAMA" make "$INIT"   || die "init build failed ($INIT)"
PKGDIR="$PKGS_DIR" "$KAMA" make "$SUDO"   || die "sudo tool build failed ($SUDO)"
PKGDIR="$PKGS_DIR" "$KAMA" make "$NET"    || die "net tool build failed ($NET)"

# stage 3 — fstab/mkinitramfs for the chosen FS
info "stage 3: finalize $TARGET_FS root"
ROOT="$ROOT" "$KERU_ROOT/scripts/mkfs-root.sh" "$TARGET_FS"

info "rootfs ready: $ROOT"