Render the Dockerfile from a template and some params

Allow updating the Dockerfile from a template and some envs, so that
it's easier to bump the dates in it.

BUILD.md

@@ -515,3 +515,9 @@ poetry run .\install\windows\build-app.bat
 ```
 
 When you're done you will have `dist\Dangerzone.msi`.
+
+## Updating the container image
+
+The Dangezone container image is reproducible. This means that every time we
+build it, the result will be bit-for-bit the same, with some minor exceptions.
+Read more on how you can update it in `docs/developer/reproducibility.md`.

Dockerfile.env

@@ -0,0 +1,9 @@
+# Can be bumped to the latest date in https://hub.docker.com/_/debian/tags?name=bookworm-
+DEBIAN_IMAGE_DATE=20250113
+# Can be bumped to today's date
+DEBIAN_ARCHIVE_DATE=20250120
+# Can be bumped to the latest date in https://github.com/google/gvisor/tags
+GVISOR_ARCHIVE_DATE=20250113
+# Can be bumped to the latest version and checksum from https://github.com/ebandal/H2Orestart/releases
+H2ORESTART_CHECKSUM=7760dc2963332c50d15eee285933ec4b48d6a1de9e0c0f6082946f93090bd132
+H2ORESTART_VERSION=v0.7.0

Dockerfile.in

@@ -0,0 +1,81 @@
+# NOTE: Updating the packages to their latest versions requires bumping the
+# Dockerfile args below. For more info about this file, read
+# docs/developer/reproducibility.md.
+
+ARG DEBIAN_IMAGE_DATE={{DEBIAN_IMAGE_DATE}}
+
+FROM debian:bookworm-${DEBIAN_IMAGE_DATE}-slim
+
+ARG GVISOR_ARCHIVE_DATE={{GVISOR_ARCHIVE_DATE}}
+ARG DEBIAN_ARCHIVE_DATE={{DEBIAN_ARCHIVE_DATE}}
+ARG H2ORESTART_CHECKSUM={{H2ORESTART_CHECKSUM}}
+ARG H2ORESTART_VERSION={{H2ORESTART_VERSION}}
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# The following way of installing packages is taken from
+# https://github.com/reproducible-containers/repro-sources-list.sh/blob/master/Dockerfile.debian-12,
+# and adapted to allow installing gVisor from each own repo as well.
+RUN \
+  --mount=type=cache,target=/var/cache/apt,sharing=locked \
+  --mount=type=cache,target=/var/lib/apt,sharing=locked \
+  --mount=type=bind,source=./container_helpers/repro-sources-list.sh,target=/usr/local/bin/repro-sources-list.sh \
+  --mount=type=bind,source=./container_helpers/gvisor.key,target=/tmp/gvisor.key \
+  : "Hacky way to set a date for the Debian snapshot repos" && \
+  touch -d ${DEBIAN_ARCHIVE_DATE} /etc/apt/sources.list.d/debian.sources && \
+  touch -d ${DEBIAN_ARCHIVE_DATE} /etc/apt/sources.list && \
+  repro-sources-list.sh && \
+  : "Setup APT to install gVisor from its separate APT repo" && \
+  apt-get update && \
+  apt-get upgrade -y && \
+  apt-get install -y --no-install-recommends apt-transport-https ca-certificates gnupg && \
+  gpg -o /usr/share/keyrings/gvisor-archive-keyring.gpg --dearmor /tmp/gvisor.key && \
+  echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/gvisor-archive-keyring.gpg] https://storage.googleapis.com/gvisor/releases ${GVISOR_ARCHIVE_DATE} main" > /etc/apt/sources.list.d/gvisor.list && \
+  : "Install the necessary gVisor and Dangerzone dependencies" && \
+  apt-get update && \
+  apt-get install -y --no-install-recommends \
+      python3 python3-fitz libreoffice-nogui libreoffice-java-common \
+      python3 python3-magic default-jre-headless fonts-noto-cjk fonts-dejavu \
+      runsc unzip wget && \
+  : "Clean up for improving reproducibility (optional)" && \
+  rm -rf /var/cache/fontconfig/ && \
+  rm -rf /etc/ssl/certs/java/cacerts && \
+  rm -rf /var/log/* /var/cache/ldconfig/aux-cache
+
+# Download H2ORestart from GitHub using a pinned version and hash. Note that
+# it's available in Debian repos, but not in Bookworm yet.
+RUN mkdir /libreoffice_ext && cd libreoffice_ext \
+    && H2ORESTART_FILENAME=h2orestart.oxt \
+    && wget https://github.com/ebandal/H2Orestart/releases/download/$H2ORESTART_VERSION/$H2ORESTART_FILENAME \
+    && echo "$H2ORESTART_CHECKSUM  $H2ORESTART_FILENAME" | sha256sum -c \
+    && install -dm777 "/usr/lib/libreoffice/share/extensions/" \
+    && rm /root/.wget-hsts
+
+# Create an unprivileged user both for gVisor and for running Dangerzone.
+RUN addgroup --gid 1000 dangerzone
+RUN adduser --uid 1000 --ingroup dangerzone --shell /bin/true \
+    --disabled-password --home /home/dangerzone dangerzone
+
+# Copy Dangerzone's conversion logic under /opt/dangerzone, and allow Python to
+# import it.
+RUN mkdir -p /opt/dangerzone/dangerzone
+RUN touch /opt/dangerzone/dangerzone/__init__.py
+
+# Copy only the Python code, and not any produced .pyc files.
+COPY conversion/*.py /opt/dangerzone/dangerzone/conversion/
+
+# Let the entrypoint script write the OCI config for the inner container under
+# /config.json.
+RUN touch /config.json
+RUN chown dangerzone:dangerzone /config.json
+
+# Switch to the dangerzone user for the rest of the script.
+USER dangerzone
+
+# Create a directory that will be used by gVisor as the place where it will
+# store the state of its containers.
+RUN mkdir /home/dangerzone/.containers
+
+COPY container_helpers/entrypoint.py /
+
+ENTRYPOINT ["/entrypoint.py"]

Makefile

@@ -47,6 +47,9 @@ test-large: test-large-init  ## Run large test set
 	python -m pytest --tb=no tests/test_large_set.py::TestLargeSet -v $(JUNIT_FLAGS) --junitxml=$(TEST_LARGE_RESULTS)
 	python $(TEST_LARGE_RESULTS)/report.py $(TEST_LARGE_RESULTS)
 
+Dockerfile: Dockerfile.env Dockerfile.in
+	poetry run jinja2 Dockerfile.in Dockerfile.env > Dockerfile
+
 .PHONY: build-clean
 build-clean:
 	doit clean

RELEASE.md

@@ -15,6 +15,7 @@ Here is a list of tasks that should be done before issuing the release:
 - [ ] Update the "Version" field in `install/linux/dangerzone.spec`
 - [ ] Bump the Debian version by adding a new changelog entry in `debian/changelog`
 - [ ] [Bump the minimum Docker Desktop versions](https://github.com/freedomofpress/dangerzone/blob/main/RELEASE.md#bump-the-minimum-docker-desktop-version) in `isolation_provider/container.py`
+- [ ] Bump the dates in the `Dockerfile`
 - [ ] Update screenshot in `README.md`, if necessary
 - [ ] CHANGELOG.md should be updated to include a list of all major changes since the last release
 - [ ] A draft release should be created. Copy the release notes text from the template at [`docs/templates/release-notes`](https://github.com/freedomofpress/dangerzone/tree/main/docs/templates/)