#
# Usage:
#
# docker build --file build.Containerfile --output <outputdir> .
# or
# podman build --file build.Containerfile --output <outputdir> .
#
# For improved reproducibility, the project directory entries can be ordered
# like this:
#
# buildah build --cap-add=sys_admin --device /dev/fuse --file build.Containerfile --output <outputdir> .
#
# In any case, the unsigned APKs are written to the specified output
# directory. Use `apksigner` to sign before installing via `adb install`.
#

FROM debian:bookworm-slim AS build-stage

# install debian packages
ENV DEBIAN_FRONTEND noninteractive
RUN --mount=target=/var/lib/apt/lists,type=cache,sharing=locked \
    --mount=target=/var/cache/apt,type=cache,sharing=locked \
    /bin/rm -f /etc/apt/apt.conf.d/docker-clean && \
    /usr/bin/apt-get update && \
    /usr/bin/apt-get --yes --no-install-recommends install disorderfs openjdk-17-jdk-headless gradle sdkmanager && \
    /bin/ln -fs /usr/share/zoneinfo/CET /etc/localtime && \
    /usr/sbin/dpkg-reconfigure --frontend noninteractive tzdata && \
    /bin/ln -s /proc/self/mounts /etc/mtab && \
    /usr/sbin/adduser --disabled-login --gecos "" builder

# give up privileges
USER builder

# copy project source code
WORKDIR /home/builder
COPY --chown=builder / project/

# accept SDK licenses
ENV ANDROID_HOME /home/builder/android-sdk
RUN --mount=target=/home/builder/android-sdk,type=cache,uid=1000,gid=1000,sharing=locked \
    yes | /usr/bin/sdkmanager --licenses >/dev/null

# build project
RUN --mount=target=/home/builder/android-sdk,type=cache,uid=1000,gid=1000,sharing=locked \
    --mount=target=/home/builder/.gradle,type=cache,uid=1000,gid=1000,sharing=locked \
    if [ -e /dev/fuse ] ; \
      then /bin/mv project project.u && /bin/mkdir project && \
      /usr/bin/disorderfs --sort-dirents=yes --reverse-dirents=no project.u project ; \
    fi && \
    /usr/bin/gradle --project-dir project/ --no-build-cache --no-daemon --no-parallel clean :oeffi:assembleRelease && \
    if [ -e /dev/fuse ] ; \
      then /bin/fusermount -u project | true && /bin/rmdir project && /bin/mv project.u project ; \
    fi

# export build output
FROM scratch AS export-stage
COPY --from=build-stage /home/builder/project/oeffi/build/outputs/apk/release/oeffi-release-unsigned.apk /