# ClaudeOS build environment
#
# Provides everything needed to build and test a bare-metal i386 kernel:
#   - Clang + LLD for cross-compilation to i386-elf
#   - GRUB 2 tools for generating bootable ISO and floppy images
#   - QEMU (i386) for running integration tests
#   - CMake + Ninja for the build system
#   - xorriso and mtools used internally by grub-mkrescue / grub-mkimage

FROM debian:bookworm-slim

ENV DEBIAN_FRONTEND=noninteractive

RUN apt-get update && apt-get install -y --no-install-recommends \
    # Core build tools
    clang \
    lld \
    cmake \
    ninja-build \
    make \
    git \
    # GRUB image generation
    grub-pc-bin \
    grub-common \
    xorriso \
    mtools \
    # QEMU for running the OS
    qemu-system-x86 \
    # Handy utilities
    file \
    ca-certificates \
    && rm -rf /var/lib/apt/lists/*

# Verify the cross-compilation toolchain can produce an i386-elf binary.
RUN echo 'void _start(void){for(;;)__asm__("hlt");}' > /tmp/test.c \
    && clang -target i386-elf -m32 -march=i386 -ffreestanding -fno-stack-protector \
             -nostdlib -fuse-ld=lld -Wl,-e,_start \
             /tmp/test.c -o /tmp/test.elf \
    && file /tmp/test.elf | grep -q "ELF 32-bit.*80386" \
    && echo "Toolchain OK" \
    && rm /tmp/test.c /tmp/test.elf

WORKDIR /workspaces/claude-os