backport-criu; usage: ./build.sh

build.sh

#!/bin/bash
set -eo pipefail

cd "$(dirname "$(readlink -f "$BASH_SOURCE")")"

img='backport-criu'

rm -rf *.orig.tar.* */ Dockerfile.* *.deb
docker build -t "$img" .
docker run -i --rm "$img" sh -c 'tar -c *.orig.tar.* */' | tar -x
for suite in */; do
	suite="${suite%/}"
	from=''
	for base in debian ubuntu; do
		if docker inspect "$base:$suite" &> /dev/null; then
			from="$base:$suite"
			break
		fi
	done
	if [ -z "$from" ]; then
		echo >&2 "ERROR: cannot determine whether $suite is Ubuntu or Debian"
		echo >&2 '  try: docker pull -a debian && docker pull -a ubuntu'
		exit 1
	fi
	dockerfile="Dockerfile.$suite"
	cat > "$dockerfile" <<-EOF
		FROM $from
		RUN apt-get update && apt-get install -y --no-install-recommends build-essential devscripts equivs fakeroot
	EOF
	case "$suite" in
		trusty)
			echo 'RUN apt-get update && apt-get install -y --no-install-recommends wget' >> "$dockerfile"
			dscs=(
				'protobuf-c_1.0.2-1'
			)
			for dsc in "${dscs[@]}"; do
				url="http://httpredir.debian.org/debian/pool/main/${dsc:0:1}/${dsc%_*}/$dsc.dsc"
				cat >> "$dockerfile" <<-EOF
					RUN set -x \
						&& cd /tmp \
						&& dget -du '$url' \
						&& dpkg-source -x '$dsc.dsc' '$dsc' \
						&& cd '$dsc' \
						&& dch --distribution '$suite' --local '~$suite' 'Backport to $suite.' \
						&& mk-build-deps -irt'apt-get --no-install-recommends -yV' debian/control && dpkg-checkbuilddeps \
						&& dpkg-buildpackage -uc -us \
						&& cd .. \
						&& dpkg -i *.deb \
						&& mv *.deb /usr/src/ \
						&& rm -rf '${dsc%_*}_'*
				EOF
			done
			;;
	esac
	cat >> "$dockerfile" <<-EOF
		WORKDIR /usr/src/pkg
		COPY $suite/debian/control /usr/src/pkg/debian/
		RUN mk-build-deps -irt'apt-get --no-install-recommends -yV' debian/control && dpkg-checkbuilddeps
		COPY *.orig.tar.* /usr/src/
		COPY $suite /usr/src/pkg
		RUN chown -R nobody:nogroup /usr/src
		USER nobody:nogroup
		RUN dpkg-buildpackage -uc -us
	EOF
	docker build -t "$img:$suite" -f "$dockerfile" .
	rm -rf "$dockerfile" "$suite/"
	docker run -i --rm "$img:$suite" sh -c 'tar -c ../*.deb' | tar -xv
done

Dockerfile

FROM debian:sid

RUN apt-get update && apt-get install -y --no-install-recommends \
		debian-keyring \
		devscripts \
		dpkg-dev \
		wget \
	&& rm -rf /var/lib/apt/lists/*

ENV DEBFULLNAME Docker
ENV DEBEMAIL support@docker.com

RUN mkdir -p /usr/src && chown -R nobody:nogroup /usr/src
USER nobody:nogroup
WORKDIR /usr/src

ENV CRIU_VERSION 1.6-2
ENV CRIU_DSC http://httpredir.debian.org/debian/pool/main/c/criu/criu_${CRIU_VERSION}.dsc

RUN dget -d "${CRIU_DSC}"

# TODO revisit whether wheezy is worth backporting the universe for :/
ENV BACKPORT_SUITES \
		jessie \
		trusty vivid

RUN set -ex \
	&& for suite in $BACKPORT_SUITES; do \
		dpkg-source -x *.dsc "$suite"; \
		( \
			cd "$suite"; \
			dch --distribution "$suite" --local "~$suite" "Backport to $suite."; \
		) \
	done