################################################################################
##  BUILDER
################################################################################
FROM rust:slim as builder

# para compilación estática sin libc
ENV TARGET x86_64-unknown-linux-musl
RUN rustup target add "$TARGET"

# xeneracion do executable
RUN USER=root mkdir ./itkg
WORKDIR ./itkg
ADD . ./

# caché: xenera unha capa de docker para os sucesivos builds
RUN --mount=type=cache,target=/usr/local/cargo/registry \
 cargo build --release --locked --target "$TARGET" \
 && mv "target/$TARGET/release/itkg" . \
 && strip itkg

# usuario para execucion
RUN groupadd app && useradd -g app app

################################################################################
##  RUNER
################################################################################
FROM scratch
ARG APP=/app

EXPOSE 3007

COPY --from=builder /etc/passwd /etc/passwd
COPY --from=builder /etc/group /etc/group

COPY --from=builder --chown=app:app /itkg/itkg ${APP}/itkg
COPY --from=builder --chown=app:app /itkg/templates/ ${APP}/templates/

USER app
WORKDIR ${APP}

CMD ["./itkg"]