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add configure_oci function and use it in ubuntu-oci

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With that, the Dockerfile modifications[0] currently done externally
are done now here. That means that the created rootfs tarball can be
directly used within a Dockerfile to create a container from scratch:

FROM scratch
ADD livecd.ubuntu-oci.rootfs.tar.gz /
CMD ["/bin/bash"]

[0]
https://github.com/tianon/docker-brew-ubuntu-core/blob/master/update.sh

(cherry picked from commit a81972a58b004897bf3e5c14ff371bc2f6b5e4b8)
This commit is contained in:
Thomas Bechtold 2021-04-20 16:56:04 +02:00
parent 3ad6996779
commit 77d998829a
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2 changed files with 60 additions and 0 deletions
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4
live-build/auto/build
View File

@ -441,6 +441,10 @@ serial: $BUILDSTAMP
EOF
fi
if [ "$PROJECT" = "ubuntu-oci" ]; then
configure_oci chroot
fi
configure_network_manager
echo "===== Checking size of /usr/share/doc ====="

56
live-build/functions
View File

@ -906,6 +906,62 @@ EOF
fi
}
configure_oci() {
# configure a chroot to be a OCI/docker container
# theses changes are taken from the current Dockerfile modifications done
# at https://github.com/tianon/docker-brew-ubuntu-core/blob/master/update.sh
local chroot=$1
echo "==== Configuring OCI ===="
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L40-L48
echo '#!/bin/sh' > ${chroot}/usr/sbin/policy-rc.d
echo 'exit 101' >> ${chroot}/usr/sbin/policy-rc.d
Chroot ${chroot} "chmod +x /usr/sbin/policy-rc.d"
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L54-L56
Chroot ${chroot} "dpkg-divert --local --rename --add /sbin/initctl"
cp -a ${chroot}/usr/sbin/policy-rc.d ${chroot}/sbin/initctl
sed -i 's/^exit.*/exit 0/' ${chroot}/sbin/initctl
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L71-L78
echo 'force-unsafe-io' > ${chroot}/etc/dpkg/dpkg.cfg.d/docker-apt-speedup
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L85-L105
echo 'DPkg::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };' > ${chroot}/etc/apt/apt.conf.d/docker-clean
echo 'APT::Update::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };' >> ${chroot}/etc/apt/apt.conf.d/docker-clean
echo 'Dir::Cache::pkgcache ""; Dir::Cache::srcpkgcache "";' >> ${chroot}/etc/apt/apt.conf.d/docker-clean
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L109-L115
echo 'Acquire::Languages "none";' > ${chroot}/etc/apt/apt.conf.d/docker-no-languages
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L118-L130
echo 'Acquire::GzipIndexes "true"; Acquire::CompressionTypes::Order:: "gz";' > ${chroot}/etc/apt/apt.conf.d/docker-gzip-indexes
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L134-L151
echo 'Apt::AutoRemove::SuggestsImportant "false";' > ${chroot}/etc/apt/apt.conf.d/docker-autoremove-suggests
# delete all the apt list files since they're big and get stale quickly
rm -rf ${chroot}/var/lib/apt/lists/*
# verify that the APT lists files do not exist
Chroot chroot "apt-get indextargets" > indextargets.out
[ ! -s indextargets.out ]
rm indextargets.out
# (see https://bugs.launchpad.net/cloud-images/+bug/1699913)
# make systemd-detect-virt return "docker"
# See: https://github.com/systemd/systemd/blob/aa0c34279ee40bce2f9681b496922dedbadfca19/src/basic/virt.c#L434
mkdir -p ${chroot}/run/systemd
echo 'docker' > ${chroot}/run/systemd/container
rm -rf ${chroot}/var/cache/apt/*.bin
echo "==== Configuring OCI done ===="
}
configure_network_manager() {
# If the image pre-installs network-manager, let it manage all devices by
# default. Installing NM on an existing system only manages wifi and wwan via