mirror of
https://github.com/containers/bootc.git
synced 2026-02-05 06:45:13 +01:00
6f69534f9b
Main goal is to reduce signing logic duplication between the systemd-boot and UKI generation. However, this quickly snowballed into wanting to actually verify by providing a custom secure boot keys to bcvk that things worked. This depends on https://github.com/bootc-dev/bcvk/pull/170 Now as part of that, I ran into what I think are bugs in pesign; this cuts things back over to using sbsign. I'll file a tracker for that separately. Finally as part of this, just remove the TMT example that builds a sealed image but doesn't actually verify it works - it's already drifted from what we do outside here. Ultimately what we need is to shift some of this into the Fedora examples and we just fetch it here anyways. Assisted-by: Claude Code (Sonnet 4.5) Signed-off-by: Colin Walters <walters@verbum.org>
68 lines
2.0 KiB
Docker
68 lines
2.0 KiB
Docker
# Override via --build-arg=base=<image> to use a different base
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ARG base=localhost/bootc
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FROM $base AS base
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FROM base as kernel
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RUN <<EORUN
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set -xeuo pipefail
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. /usr/lib/os-release
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case $ID in
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centos|rhel)
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dnf config-manager --set-enabled crb
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# Enable EPEL for sbsigntools
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dnf -y install epel-release
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;;
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esac
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dnf -y install systemd-ukify sbsigntools
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EORUN
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# Must be passed
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ARG COMPOSEFS_FSVERITY
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RUN --network=none \
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--mount=type=secret,id=secureboot_key \
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--mount=type=secret,id=secureboot_cert \
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--mount=type=bind,from=base,target=/target \
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<<EOF
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set -xeuo pipefail
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# Should be generated externally
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test -n "${COMPOSEFS_FSVERITY}"
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cmdline="composefs=${COMPOSEFS_FSVERITY} console=ttyS0,115200n8 console=hvc0 enforcing=0 rw"
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# Use sbsign to re-sign the entire UKI with our key
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kver=$(cd /target/usr/lib/modules && echo *)
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ukify build \
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--linux "/target/usr/lib/modules/$kver/vmlinuz" \
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--initrd "/target/usr/lib/modules/$kver/initramfs.img" \
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--uname="${kver}" \
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--cmdline "${cmdline}" \
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--os-release "@/target/usr/lib/os-release" \
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--signtool sbsign \
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--secureboot-private-key "/run/secrets/secureboot_key" \
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--secureboot-certificate "/run/secrets/secureboot_cert" \
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--measure \
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--json pretty \
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--output "/boot/$kver.efi"
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EOF
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FROM base as final
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RUN --network=none --mount=type=bind,from=kernel,target=/run/kernel <<EOF
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set -xeuo pipefail
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kver=$(cd /usr/lib/modules && echo *)
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mkdir -p /boot/EFI/Linux
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# We put the UKI in /boot for now due to composefs verity not being the
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# same due to mtime of /usr/lib/modules being changed
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target=/boot/EFI/Linux/$kver.efi
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cp /run/kernel/boot/$kver.efi $target
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# And remove the defaults
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rm -v /usr/lib/modules/${kver}/{vmlinuz,initramfs.img}
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# Symlink into the /usr/lib/modules location
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ln -sr $target /usr/lib/modules/${kver}/$(basename $kver.efi)
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bootc container lint --fatal-warnings
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EOF
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FROM base as final-final
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COPY --from=final /boot /boot
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# Override the default
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LABEL containers.bootc=sealed
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