71 lines
3.3 KiB
Docker
71 lines
3.3 KiB
Docker
# This container build uses some special features of podman that allow
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# a process executing as part of a container build to generate a new container
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# image "from scratch".
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#
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# This container build uses nested containerization, so you must build with e.g.
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# podman build --security-opt=label=disable --cap-add=all --device /dev/fuse <...>
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#
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# # Why are we doing this?
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#
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# Today this base image build process uses rpm-ostree. There is a lot of things that
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# rpm-ostree does when generating a container image...but important parts include:
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#
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# - auto-updating labels in the container metadata
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# - Generating "chunked" content-addressed reproducible image layers (notice
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# how there are ~60 layers in the generated image)
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#
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# The latter bit in particular is currently impossible to do from Containerfile.
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# A future goal is adding some support for this in a way that can be honored by
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# buildah (xref https://github.com/containers/podman/discussions/12605)
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#
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# # Why does this build process require additional privileges?
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#
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# Because it's generating a base image and uses containerization features itself.
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# In the future some of this can be lifted.
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FROM quay.io/fedora/fedora:rawhide as repos
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# BOOTSTRAPPING: This can be any image that has rpm-ostree and selinux-policy-targeted.
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FROM quay.io/fedora/fedora:41 as builder
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RUN dnf -y install rpm-ostree selinux-policy-targeted
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ARG MANIFEST=fedora-bootc.yaml
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COPY --from=repos /etc/dnf/vars /etc/dnf/vars
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COPY --from=repos /etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-* /etc/pki/rpm-gpg
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# The input git repository has .repo files committed to git rpm-ostree has historically
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# emphasized that. But here, we are fetching the repos from the container base image.
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# So copy the source, and delete the hardcoded ones in git, and use the container base
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# image ones. We can drop the ones commited to git when we hard switch to Containerfile.
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COPY . /src
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WORKDIR /src
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RUN rm -vf /src/*.repo
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COPY --from=repos /etc/yum.repos.d/*.repo /src
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# Construct the base rootfs
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RUN --mount=type=cache,target=/workdir \
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--mount=type=bind,from=repos,src=/,dst=/repos <<EORUN
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set -xeuo pipefail
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mkdir /tmp-ostree
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ostree --repo=/tmp-ostree init --mode=bare-user
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rm /workdir/target-rootfs -rf
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rpm-ostree compose install --unified-core --cachedir=/workdir --repo=/tmp-ostree --source-root=/repos ${MANIFEST} /workdir/target-rootfs
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EORUN
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# Add whatever you want here! e.g.
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# FROM quay.io/examplecorp/someartifact:latest as artifacts
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# COPY --from=artifacts /usr /usr
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# Final steps: postprocess and commit, then generate an OCI archive
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RUN --mount=type=cache,target=/workdir --mount=type=bind,rw=true,src=.,dst=/buildcontext,bind-propagation=shared <<EORUN
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set -xeuo pipefail
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rpm-ostree compose commit --repo=/tmp-ostree --write-commitid-to=/tmp/commit.txt ${MANIFEST} /workdir/target-rootfs/rootfs
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rpm-ostree compose container-encapsulate --repo=/tmp-ostree --image-config fedora-bootc-config.json $(cat /tmp/commit.txt) oci-archive:/buildcontext/out.ociarchive
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EORUN
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# At this point we're done with the builder image and we have our OCI archive.
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FROM oci-archive:./out.ociarchive
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# Need to reference builder here to force ordering. But since we have to run
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# something anyway, we might as well cleanup after ourselves.
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RUN --mount=type=bind,from=builder,src=.,target=/var/tmp \
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--mount=type=bind,rw=true,src=.,dst=/buildcontext,bind-propagation=shared \
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rm /buildcontext/out.ociarchive
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