# Zero OS Alpine Initramfs Builder Container
FROM alpine:3.22

# Install build dependencies including rustup
RUN apk add --no-cache \
    build-base \
    rustup \
    upx \
    git \
    wget \
    curl \
    tar \
    gzip \
    xz \
    cpio \
    binutils \
    linux-headers \
    musl-dev \
    musl-utils \
    pkgconfig \
    openssl-dev \
    perl \
    bash \
    findutils \
    grep \
    sed \
    coreutils \
    diffutils \
    flex \
    bison \
    bc \
    elfutils-dev \
    ncurses-dev \
    kmod \
    pahole

# Setup rustup with stable and musl target
RUN rustup-init -y && \
    source /root/.cargo/env && \
    rustup install stable && \
    rustup target add x86_64-unknown-linux-musl && \
    echo 'source /root/.cargo/env' >> /etc/profile

# Create non-root user for builds matching host user
RUN adduser -D -s /bin/bash builder

# Set working directory with proper permissions
WORKDIR /workspace
RUN chown builder:builder /workspace

# Set environment variables - rustup handles everything
ENV PATH="/root/.cargo/bin:${PATH}"
ENV RUSTFLAGS="-C target-feature=+crt-static"

CMD ["/bin/bash"]