FROM alpine:3.20 AS builder
LABEL maintainer="fithwum"

WORKDIR /builder

# Install tools needed for building rootfs
RUN apk update && apk add --no-cache \
    bash curl wget git jq ca-certificates coreutils \
    tar gzip

# Download alpine-make-rootfs script
RUN wget https://raw.githubusercontent.com/alpinelinux/alpine-make-rootfs/master/alpine-make-rootfs \
    && chmod +x alpine-make-rootfs

# Build the rootfs
RUN ./alpine-make-rootfs \
    --branch v3.20 \
    --mirror http://dl-cdn.alpinelinux.org/alpine \
    --packages "bash curl ca-certificates nano" \
    alpine-rootfs

# Run custom script inside rootfs without chroot (simulate setup)
COPY base-image-script/alpine-base_pt2.sh /builder/alpine-rootfs/
RUN chmod +x /builder/alpine-rootfs/alpine-base_pt2.sh && \
    chroot /builder/alpine-rootfs /alpine-base_pt2.sh || true

# Clean up the part2 script after execution
RUN rm -f /builder/alpine-rootfs/alpine-base_pt2.sh

# Package it
RUN mkdir -p /output && \
    tar -czf /output/alpine-base.tar.gz -C alpine-rootfs .

# Final image to export tarball
FROM scratch AS export-stage
COPY --from=builder /output/alpine-base.tar.gz /output/alpine-base.tar.gz
CMD ["sleep", "infinity"]