Initial commit

CONTRIBUTING.md

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+# tl;dr: NO PULL REQUESTS PLEASE
+## OPEN ISSUES TO DISCUSS CHANGES
+
+Git is not a fan of what we're doing here.  To combat this, we use
+`git checkout --orphan`, which very effectively discards all the history of
+the branch for each tarball.  The benefit is much shorter download times,
+since there's no big binary history.
+
+Please feel free to open issues and discuss these images.  I've
+intentionally left the issue tracker here open for just such discussion!
+However, please do not submit pull requests.  Due to this repo's unique
+nature, pull requests are not only impossible to review, but also break the
+orphaned history and increase repository clone times for everyone (most
+importantly for the [stackbrew](https://github.com/dotcloud/stackbrew)
+maintainers who have to test and deploy these images often).

README.md

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+CONTRIBUTING.md

update.sh

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+#!/bin/bash
+set -e
+
+cd "$(dirname "$BASH_SOURCE")"
+
+versions=( "$@" )
+if [ ${#versions[@]} -eq 0 ]; then
+	versions=( */ )
+fi
+versions=( "${versions[@]%/}" )
+
+for v in "${versions[@]}"; do
+	(
+		cd "$v"
+		thisTar="$v-core-amd64.tar.gz"
+		wget -qN "http://cdimage.ubuntu.com/ubuntu-core/$v/daily/current/"{MD5,SHA{1,256}}SUMS{,.gpg}
+		wget -N "http://cdimage.ubuntu.com/ubuntu-core/$v/daily/current/$thisTar"
+		sha256sum="$(sha256sum "$thisTar" | cut -d' ' -f1)"
+		if ! grep -q "$sha256sum" SHA256SUMS; then
+			echo >&2 "error: '$thisTar' has invalid SHA256"
+			exit 1
+		fi
+		cat > Dockerfile <<EOF
+FROM scratch
+ADD $thisTar /
+EOF
+
+		cat >> Dockerfile <<'EOF'
+
+# a few minor docker-specific tweaks
+RUN echo '#!/bin/sh' > /usr/sbin/policy-rc.d \
+	&& echo 'exit 101' >> /usr/sbin/policy-rc.d \
+	&& chmod +x /usr/sbin/policy-rc.d \
+	&& dpkg-divert --local --rename --add /sbin/initctl \
+	&& ln -sf /bin/true /sbin/initctl \
+	\
+	&& echo 'force-unsafe-io' > /etc/dpkg/dpkg.cfg.d/02apt-speedup \
+	\
+	&& echo 'DPkg::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };' > /etc/apt/apt.conf.d/no-cache \
+	&& echo 'APT::Update::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };' >> /etc/apt/apt.conf.d/no-cache \
+	&& echo 'Dir::Cache::pkgcache ""; Dir::Cache::srcpkgcache "";' >> /etc/apt/apt.conf.d/no-cache \
+	\
+	&& echo 'Acquire::Languages "none";' > /etc/apt/apt.conf.d/no-languages
+
+# enable the universe
+RUN sed -i 's/^#\s*\(deb.*universe\)$/\1/g' /etc/apt/sources.list
+
+# overwrite this with 'CMD []' in a dependent Dockerfile
+CMD ["/bin/bash"]
+EOF
+	)
+done
+
+user="$(docker info | awk '/^Username:/ { print $2 }')"
+[ -z "$user" ] || user="$user/"
+for v in "${versions[@]}"; do
+	( set -x; docker build -t "${user}ubuntu-core:$v" "$v" )
+done