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tests/docker/dockerfiles: new debian-bootstrap.docker

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Together with the debian-bootstrap.pre script can now build an arbitrary
architecture of Debian using debootstrap. This allows debootstrap to set
up its first stage before the container is built.

To build a container you need a command line like:

  DEB_ARCH=armhf DEB_TYPE=testing \
    ./tests/docker/docker.py build \
    --include-executable=arm-linux-user/qemu-arm debian:armhf \
    ./tests/docker/dockerfiles/debian-bootstrap.docker

Although a number of non-debian systems package the debootstrap script
it is fairly portable in itself. Assuming we have some sort of fakeroot
implementation we can just clone the upstream repository and use the
script from there.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 1468934445-32183-5-git-send-email-famz@redhat.com
Signed-off-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Alex Bennée 2016-07-19 21:20:39 +08:00 committed by Fam Zheng
parent 920776ea5e
commit 95c975013a
2 changed files with 108 additions and 0 deletions
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21
tests/docker/dockerfiles/debian-bootstrap.docker Normal file
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# Create Debian Bootstrap Image
#
# This is intended to be pre-poluated by:
# - a first stage debootstrap (see debian-bootstrap.pre)
# - a native qemu-$arch that binfmt_misc will run
FROM scratch
# Add everything from the context into the container
ADD . /
# Patch all mounts as docker already has stuff set up
RUN sed -i 's/in_target mount/echo not for docker in_target mount/g' /debootstrap/functions
# Run stage 2
RUN /debootstrap/debootstrap --second-stage
# At this point we can install additional packages if we want
# Duplicate deb line as deb-src
RUN cat /etc/apt/sources.list | sed "s/deb/deb-src/" >> /etc/apt/sources.list
RUN apt-get update
RUN apt-get -y build-dep qemu

87
tests/docker/dockerfiles/debian-bootstrap.pre Executable file
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#!/bin/sh
#
# Simple wrapper for debootstrap, run in the docker build context
#
FAKEROOT=`which fakeroot 2> /dev/null`
exit_and_skip()
{
exit 3
}
#
# fakeroot is needed to run the bootstrap stage
#
if [ -z $FAKEROOT ]; then
echo "Please install fakeroot to enable bootstraping"
exit_and_skip
fi
# We check in order for
#
# - DEBOOTSTRAP_DIR pointing at a development checkout
# - PATH for the debootstrap script (installed)
#
# If neither option works then we checkout debootstrap from its
# upstream SCM and run it from there.
#
if [ -z $DEBOOTSTRAP_DIR ]; then
DEBOOTSTRAP=`which debootstrap 2> /dev/null`
if [ -z $DEBOOTSTRAP ]; then
echo "No debootstrap installed, attempting to install from SCM"
DEBOOTSTRAP_SOURCE=https://anonscm.debian.org/git/d-i/debootstrap.git
git clone ${DEBOOTSTRAP_SOURCE} ./debootstrap.git
export DEBOOTSTRAP_DIR=./debootstrap.git
DEBOOTSTRAP=./debootstrap.git/debootstrap
fi
else
DEBOOTSTRAP=${DEBOOTSTRAP_DIR}/debootstrap
if [ ! -f $DEBOOTSTRAP ]; then
echo "Couldn't find script at ${DEBOOTSTRAP}"
exit_and_skip
fi
fi
#
# Finally check to see if any qemu's are installed
#
BINFMT_DIR=/proc/sys/fs/binfmt_misc
if [ ! -e $BINFMT_DIR ]; then
echo "binfmt_misc needs enabling for a QEMU bootstrap to work"
exit_and_skip
else
# DEB_ARCH and QEMU arch names are not totally aligned
case "${DEB_ARCH}" in
amd64)
QEMU=qemu-i386
;;
armel|armhf)
QEMU=qemu-arm
;;
arm64)
QEMU=qemu-aarch64
;;
powerpc)
QEMU=qemu-ppc
;;
ppc64el)
QEMU=qemu-ppc64le
;;
s390)
QEMU=qemu-s390x
;;
*)
QEMU=qemu-${DEB_ARCH}
;;
esac
if [ ! -e "${BINFMT_DIR}/$QEMU" ]; then
echo "No binfmt_misc rule to run $QEMU, can't bootstrap"
exit_and_skip
fi
fi
echo "Building a rootfs using ${FAKEROOT} and ${DEBOOTSTRAP} ${DEB_ARCH}/${DEB_TYPE}"
${FAKEROOT} ${DEBOOTSTRAP} --variant=buildd --foreign --arch=$DEB_ARCH $DEB_TYPE . http://httpredir.debian.org/debian || exit 1
exit 0