docker/Dockerfile_snap

FROM ubuntu:jammy as builder

# Grab dependencies.
RUN apt-get update
RUN apt-get dist-upgrade --yes
RUN apt-get install --yes \
      curl \
      jq \
      squashfs-tools

# Grab the core snap (for backwards compatibility) from the stable channel and
# unpack it in the proper place.
RUN curl -L $(curl -H 'X-Ubuntu-Series: 16' -H "X-Ubuntu-Architecture: amd64" 'https://api.snapcraft.io/api/v1/snaps/details/core' | jq '.download_url' -r) --output core.snap
RUN mkdir -p /snap/core
RUN unsquashfs -d /snap/core/current core.snap

# Grab the core18 snap (which snapcraft uses as a base) from the stable channel
# and unpack it in the proper place.
RUN curl -L $(curl -H 'X-Ubuntu-Series: 16' -H "X-Ubuntu-Architecture: amd64" 'https://api.snapcraft.io/api/v1/snaps/details/core18' | jq '.download_url' -r) --output core18.snap
RUN mkdir -p /snap/core18
RUN unsquashfs -d /snap/core18/current core18.snap

# Grab the core22 snapfrom the stable channel
# and unpack it in the proper place.
RUN curl -L $(curl -H 'X-Ubuntu-Series: 16' -H "X-Ubuntu-Architecture: amd64" 'https://api.snapcraft.io/api/v1/snaps/details/core22' | jq '.download_url' -r) --output core22.snap
RUN mkdir -p /snap/core22
RUN unsquashfs -d /snap/core22/current core22.snap

# Grab the snapcraft snap from the targeted channel and unpack it in the proper
# place.
# RUN curl -L $(curl -H 'X-Ubuntu-Series: 16' 'https://api.snapcraft.io/api/v1/snaps/details/snapcraft?channel=stable' | jq '.download_url' -r) --output snapcraft.snap
# Current snapcraft snap is broken upstream again:
#   https://forum.snapcraft.io/t/snapcraft-docker-images-broken-again/27942
# Temporary workaround: pin to an older, non-broken version for now.
# TODO: restore to the above once issue is fixed upstream.
RUN curl -L https://api.snapcraft.io/api/v1/snaps/download/vMTKRaLjnOJQetI78HjntT37VuoyssFE_6751.snap --output snapcraft.snap
RUN mkdir -p /snap/snapcraft
RUN unsquashfs -d /snap/snapcraft/current snapcraft.snap

# Create a snapcraft runner (TODO: move version detection to the core of
# snapcraft).
RUN mkdir -p /snap/bin
RUN echo "#!/bin/sh" > /snap/bin/snapcraft
RUN snap_version="$(awk '/^version:/{print $2}' /snap/snapcraft/current/meta/snap.yaml)" && echo "export SNAP_VERSION=\"$snap_version\"" >> /snap/bin/snapcraft
RUN echo 'exec "$SNAP/usr/bin/python3" "$SNAP/bin/snapcraft" "$@"' >> /snap/bin/snapcraft
RUN chmod +x /snap/bin/snapcraft

# Multi-stage build, only need the snaps from the builder. Copy them one at a
# time so they can be cached.
FROM ubuntu:jammy
COPY --from=builder /snap/core /snap/core
COPY --from=builder /snap/core18 /snap/core18
COPY --from=builder /snap/core22 /snap/core22
COPY --from=builder /snap/snapcraft /snap/snapcraft
COPY --from=builder /snap/bin/snapcraft /snap/bin/snapcraft

# Generate locale and install dependencies.
RUN apt-get update && apt-get dist-upgrade --yes && apt-get install --yes snapd sudo locales && locale-gen en_US.UTF-8

# Set the proper environment.
ENV LANG="en_US.UTF-8"
ENV LANGUAGE="en_US:en"
ENV LC_ALL="en_US.UTF-8"
ENV PATH="/snap/bin:$PATH"
ENV SNAP="/snap/snapcraft/current"
ENV SNAP_NAME="snapcraft"

ENV SNAP_ARCH="amd64"

ADD scripts/build-package-snap.sh /opt/build-package-snap.sh
CMD ["/opt/build-package-snap.sh"]