Re: [Qemu-devel] [PATCH v6 4/8] tests/docker/dockerfiles: new debian-bootstrap.docker

["Alex Bennée" <alex.bennee@linaro.org>]

Fam Zheng <famz@redhat.com> writes:

> From: Alex Bennée <alex.bennee@linaro.org>
>
> 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: 1468335639-24582-5-git-send-email-alex.bennee@linaro.org

Acked-by: Alex Bennée <alex.bennee@linaro.org>

> ---
>  tests/docker/dockerfiles/debian-bootstrap.docker | 21 ++++++
>  tests/docker/dockerfiles/debian-bootstrap.pre    | 87 ++++++++++++++++++++++++
>  2 files changed, 108 insertions(+)
>  create mode 100644 tests/docker/dockerfiles/debian-bootstrap.docker
>  create mode 100755 tests/docker/dockerfiles/debian-bootstrap.pre
>
> diff --git a/tests/docker/dockerfiles/debian-bootstrap.docker b/tests/docker/dockerfiles/debian-bootstrap.docker
> new file mode 100644
> index 0000000..3a9125e
> --- /dev/null
> +++ b/tests/docker/dockerfiles/debian-bootstrap.docker
> @@ -0,0 +1,21 @@
> +# 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
> diff --git a/tests/docker/dockerfiles/debian-bootstrap.pre b/tests/docker/dockerfiles/debian-bootstrap.pre
> new file mode 100755
> index 0000000..55850be
> --- /dev/null
> +++ b/tests/docker/dockerfiles/debian-bootstrap.pre
> @@ -0,0 +1,87 @@
> +#!/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 ${DEBOOTSTRAP}"
> +
> +${FAKEROOT} ${DEBOOTSTRAP} --variant=buildd --foreign --arch=$DEB_ARCH $DEB_TYPE . http://httpredir.debian.org/debian || exit 1
> +exit 0


--
Alex Bennée