Dockerfile.minimal

# Minimal LFS Docker build for production use
FROM alpine:latest AS builder

# Install necessary tools for processing
RUN apk add --no-cache tar gzip findutils

# Copy LFS source
COPY lfs12/ /lfs-staging/

# Aggressive cleanup for minimal container
RUN cd /lfs-staging && \
    # Remove kernel and boot files (not needed in container)
    rm -rf boot/* && \
    # Remove device files (will be created by Docker)
    rm -rf dev/* && \
    # Remove mount points content
    rm -rf proc/* sys/* tmp/* && \
    # Remove lost+found
    rm -rf lost+found && \
    # Remove documentation and man pages 
    rm -rf usr/share/man/* usr/share/doc/* usr/share/info/* && \
    # Remove locale files except C.UTF-8 
    find usr/share/locale -mindepth 1 -maxdepth 1 ! -name 'C*' -exec rm -rf {} + && \
    # Remove static libraries 
    find usr/lib lib usr/lib64 lib64 -name "*.a" -delete 2>/dev/null || true && \
    # Remove development headers 
    rm -rf usr/include/* && \
    # Remove pkgconfig files
    find usr/lib -name "pkgconfig" -type d -exec rm -rf {} + 2>/dev/null || true && \
    # Remove libtool files
    find . -name "*.la" -delete && \
    # Remove Python cache and compiled files
    find . -name "__pycache__" -type d -exec rm -rf {} + 2>/dev/null || true && \
    find . -name "*.pyc" -delete 2>/dev/null || true && \
    find . -name "*.pyo" -delete 2>/dev/null || true && \
    # Remove Perl pod files
    find . -name "*.pod" -delete 2>/dev/null || true && \
    # Remove test directories
    find . -name "test" -type d -exec rm -rf {} + 2>/dev/null || true && \
    find . -name "tests" -type d -exec rm -rf {} + 2>/dev/null || true && \
    # Remove debug symbols 
    find usr/bin bin usr/sbin sbin usr/lib lib usr/lib64 lib64 -type f -executable -exec strip --strip-unneeded {} + 2>/dev/null || true && \
    # Remove unused sbin tools for containers
    cd usr/sbin && rm -f *mount* *swap* *fdisk* *mkfs* *fsck* *parted* *cfdisk* *sfdisk* 2>/dev/null || true && \
    cd /lfs-staging/sbin && rm -f *mount* *swap* *fdisk* *mkfs* *fsck* *parted* *cfdisk* *sfdisk* 2>/dev/null || true && \
    cd /lfs-staging && \
    # Remove compiler toolchain - uncomment if you don't need gcc/make in container
    # rm -rf usr/bin/gcc* usr/bin/g++* usr/bin/cpp usr/bin/cc usr/bin/c++ && \
    # rm -rf usr/bin/make usr/bin/ar usr/bin/ranlib usr/bin/ld usr/bin/as && \
    # rm -rf usr/lib/gcc usr/libexec/gcc && \
    # Remove large unnecessary binaries
    cd usr/bin && rm -f gdb valgrind* strace *tex* && \
    # Keep only essential libraries, remove unused ones
    cd /lfs-staging && \
    # Remove unused kernel modules
    rm -rf usr/lib/modules/* 2>/dev/null || true && \
    # Remove timezone data except UTC
    cd usr/share/zoneinfo && find . -type f ! -name "UTC" ! -name "GMT*" -delete 2>/dev/null || true && \
    cd /lfs-staging && \
    # Create essential directories
    mkdir -p proc sys tmp dev run var/tmp var/run

# Final stage - create minimal LFS container
FROM scratch

# Copy only the cleaned LFS system
COPY --from=builder /lfs-staging/ /

# Set minimal environment variables
ENV PATH="/usr/bin:/bin:/usr/sbin:/sbin"
ENV TERM=xterm
ENV HOME=/root
ENV USER=root
ENV SHELL=/bin/bash
ENV LC_ALL=C.UTF-8

# Set working directory
WORKDIR /root

# Minimal health check
HEALTHCHECK --interval=60s --timeout=5s --start-period=10s --retries=2 \
    CMD /bin/test -f /bin/bash || exit 1

# Add minimal labels
LABEL maintainer="LFS Builder" \
      description="Minimal Linux From Scratch 12 Container" \
      version="12.0-minimal" \
      size="minimal" \
      architecture="x86_64"

# Default command
CMD ["/bin/bash"]