Initial commit

docker/kernel-builder/Dockerfile

@@ -0,0 +1,23 @@
+FROM ubuntu:24.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential bc bison flex kmod cpio gawk \
+    libdw-dev libelf-dev libssl-dev \
+    python3 rsync dpkg-dev debhelper zstd \
+    perl git xz-utils ccache \
+    && rm -rf /var/lib/apt/lists/*
+
+ENV PATH="/usr/lib/ccache:${PATH}"
+ENV CCACHE_DIR=/ccache
+
+WORKDIR /src
+
+# Kernel source is bind-mounted at /src
+# Build artifacts are staged to /out/staging
+
+COPY docker/kernel-builder/build.sh /build.sh
+RUN chmod +x /build.sh
+
+CMD ["/build.sh"]

docker/kernel-builder/build.sh

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+#!/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"
+
+echo "=== Build artifacts staged in /out/staging ==="