#!/bin/bash
# Compiles the kernel and stages all artifacts into /out/staging.
# Runs inside Docker; kernel source is bind-mounted at /src.
set -e

# Clean host-built tool artifacts that may reference wrong include paths
make -C tools/objtool clean 2>/dev/null || true

make olddefconfig
make -j"$(nproc)" bzImage modules

# Stage all artifacts so downstream packagers don't need to run make
echo "=== Staging build artifacts ==="
rm -rf /out/staging
mkdir -p /out/staging/boot

cp arch/x86/boot/bzImage /out/staging/boot/
cp System.map             /out/staging/
cp .config                /out/staging/

make modules_install INSTALL_MOD_PATH=/out/staging INSTALL_MOD_STRIP=1

# Remove dangling symlinks back into the source tree
KVER=$(make -s kernelrelease)
rm -f "/out/staging/lib/modules/$KVER/build" \
      "/out/staging/lib/modules/$KVER/source"

# Stage kernel headers for out-of-tree module builds
echo "=== Staging kernel headers ==="
HDR="/out/staging/headers"
make headers_install INSTALL_HDR_PATH="$HDR/usr"

# Use the kernel's own install-extmod-build script (same as deb-pkg uses)
export srctree=/src SRCARCH=x86
CC="${CROSS_COMPILE}gcc" HOSTCC=gcc MAKE=make /src/scripts/package/install-extmod-build "$HDR/lib/modules/$KVER/build"

echo "=== Build artifacts staged in /out/staging ==="