--- /dev/null
+# vim:ft=Dockerfile
+# Same as travis-base.Dockerfile, but without the test suite dependencies since
+# we only build Debian packages on Ubuntu i386, we don’t run the tests.
+FROM i386/ubuntu:wily
+
+RUN echo force-unsafe-io > /etc/dpkg/dpkg.cfg.d/docker-apt-speedup
+# Paper over occasional network flakiness of some mirrors.
+RUN echo 'APT::Acquire::Retries "5";' > /etc/apt/apt.conf.d/80retry
+
+# NOTE: I tried exclusively using gce_debian_mirror.storage.googleapis.com
+# instead of httpredir.debian.org, but the results (Fetched 123 MB in 36s (3357
+# kB/s)) are not any better than httpredir.debian.org (Fetched 123 MB in 34s
+# (3608 kB/s)). Hence, let’s stick with httpredir.debian.org (default) for now.
+
+# Install mk-build-deps (for installing the i3 build dependencies),
+# clang and clang-format-3.5 (for checking formatting and building with clang),
+# lintian (for checking spelling errors),
+RUN linux32 apt-get update && \
+ DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+ dpkg-dev devscripts git equivs \
+ clang clang-format-3.5 \
+ lintian && \
+ rm -rf /var/lib/apt/lists/*
+
+# Install i3 build dependencies.
+COPY debian/control /usr/src/i3-debian-packaging/control
+RUN linux32 apt-get update && \
+ DEBIAN_FRONTEND=noninteractive mk-build-deps --install --remove --tool 'apt-get --no-install-recommends -y' /usr/src/i3-debian-packaging/control && \
+ rm -rf /var/lib/apt/lists/*