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## The below code is from snapcraft/docker/stable.Dockerfile

## The modifications done are part of the documentation for enabling core18 snaps.

## https://snapcraft.io/docs/t/creating-docker-images-for-snapcraft/11739

# /!\ The base image must follow the version of the `coreXX` package

# https://forum.snapcraft.io/t/issues-dockerizing-a-snapcraft-build-process/30294/5

FROM ubuntu:focal

ENV LANG='en_US.UTF-8' \

    LANGUAGE='en_US:en' \

    LC_ALL='en_US.UTF-8' \

    PATH="/snap/bin:$PATH" \

    SNAP='/snap/snapcraft/current' \

    SNAP_NAME='snapcraft' \

    SNAP_ARCH='amd64' \

    TERM='dumb' \

    TZ='Etc/UTC'

RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone

# Grab dependencies. snapd is now required per https://github.com/snapcore/snapcraft/pull/3210

RUN apt-get update && \

    apt-get dist-upgrade --yes && \

    apt-get install --yes \

      curl \

      jq \

      squashfs-tools \

      locales \

      bzip2 \

      curl \

      gcc \

      git \

      python3 \

      locales \

      snapd \

      sudo \

      && \

locale-gen "$LANG"

COPY download_and_install_snap.sh .

RUN bash download_and_install_snap.sh 'core20'

RUN bash download_and_install_snap.sh 'gnome-3-38-2004'

RUN bash download_and_install_snap.sh 'gnome-3-38-2004-sdk'

RUN bash download_and_install_snap.sh 'snapcraft'

# Fix Python3 installation: Make sure we use the interpreter from

# the snapcraft snap:

RUN unlink /snap/snapcraft/current/usr/bin/python3 && \

    ln -s /snap/snapcraft/current/usr/bin/python3.* /snap/snapcraft/current/usr/bin/python3 && \

    echo /snap/snapcraft/current/lib/python3.*/site-packages >> /snap/snapcraft/current/usr/lib/python3/dist-packages/site-packages.pth

# 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

RUN mkdir /scripts/

WORKDIR /scripts/

# Copy everything in the docker/firefox-snap folder but the Dockerfile

# XXX The following pattern is neither a regex nor a glob one. It's

# documented at https://golang.org/pkg/path/filepath/#Match. There's no

# way of explicitly filtering out "Dockerfile". If one day, someone needs

# to add a file starting with "D", then we must revisit the pattern below.

COPY [^D]* /scripts/

# Set a default command useful for debugging

CMD ["/bin/bash", "--login"]