FROM alpine
LABEL maintainer="vlad@deviant.guru"

ARG APP
ARG LUAJIT_TAG=v2.1
ARG ARCH=x86_64

RUN apk add --no-cache git alpine-sdk ca-certificates bash clang \
    util-linux linux-headers

RUN mkdir -p /src && cd /src && git clone https://github.com/LuaJIT/LuaJIT && cd LuaJIT && \
    git checkout ${LUAJIT_TAG} && \
    make XCFLAGS="-DLUAJIT_DISABLE_FFI -DLUAJIT_ENABLE_LUA52COMPAT" && \
    make install

COPY src /src/lilush/src
COPY buildgen /src/lilush/buildgen

# Optional external-pack build. When PACK_URL is set, clone the pack repo and
# build the binary from its own build descriptor (build/${APP}.lua) instead of
# an in-tree apps/${APP}.lua config. PACK_REF must be an immutable ref (tag or
# commit SHA): changing it busts this layer, whereas a moving branch name would
# silently reuse a stale cached clone.
ARG PACK_URL=""
ARG PACK_REF=""
RUN if [ -n "$PACK_URL" ]; then \
      git clone "$PACK_URL" /src/pack && cd /src/pack && git checkout "$PACK_REF"; \
    fi

RUN cd /src/lilush/buildgen && \
    if [ -d /src/pack ]; then ./generate.lua /src/pack/build/${APP}.lua /src/pack; \
    else ./generate.lua apps/${APP}.lua; fi