113 lines
5.0 KiB
Bash
Executable File
113 lines
5.0 KiB
Bash
Executable File
#!/usr/bin/env bash
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# extract-artifacts.sh <qcow2> <output-dir>
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#
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# Pulls the diskless deliverables out of the Packer-built disk image:
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# vmlinuz -> HTTPS boot server
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# initramfs.img -> HTTPS boot server (the fleet-generic image)
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# rootfs.erofs -> nvmet target: shared READ-ONLY NVMe/TCP namespace
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# (erofs data + dm-verity hash tree appended in-file)
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# verity.json -> root hash + hash offset (feeds the kernel cmdline)
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# cmdline.txt -> ready-made kernel cmdline fragment for this build
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#
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# Requires on the build host: libguestfs-tools, erofs-utils (mkfs.erofs),
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# cryptsetup (veritysetup), jq.
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set -euo pipefail
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QCOW2=${1:?usage: extract-artifacts.sh <qcow2> <output-dir> [disable_dot1x]}
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OUT=${2:?usage: extract-artifacts.sh <qcow2> <output-dir> [disable_dot1x]}
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# TEMPORARY test toggle: when "true", bake rd.dot1x=0 into the cmdline so the
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# UKI boots with 802.1X + MACsec disabled (open-port NVMe-oF boot test).
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DISABLE_DOT1X=${3:-false}
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for bin in virt-copy-out virt-tar-out virt-ls mkfs.erofs veritysetup jq; do
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command -v "$bin" >/dev/null || { echo "ERROR: $bin not found on build host" >&2; exit 1; }
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done
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mkdir -p "$OUT"
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export LIBGUESTFS_BACKEND=direct
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WORK=$(mktemp -d)
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trap 'rm -rf "$WORK"' EXIT
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echo "==> Locating kernel and generic initramfs in $QCOW2"
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KERNEL=$(virt-ls -a "$QCOW2" /boot | grep '^vmlinuz-' | grep -v rescue | sort -V | tail -1)
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[ -n "$KERNEL" ] || { echo "ERROR: no kernel found in image" >&2; exit 1; }
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virt-copy-out -a "$QCOW2" "/boot/$KERNEL" "/boot/initramfs-generic.img" "$OUT/"
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mv "$OUT/$KERNEL" "$OUT/vmlinuz"
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mv "$OUT/initramfs-generic.img" "$OUT/initramfs.img"
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echo "==> Exporting root tree"
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virt-tar-out -a "$QCOW2" / "$WORK/rootfs.tar"
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mkdir "$WORK/root"
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tar -C "$WORK/root" --numeric-owner -xpf "$WORK/rootfs.tar"
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rm -rf "$WORK/root/boot/"* "$WORK/rootfs.tar" # diskless hosts don't need /boot
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echo "==> Building reproducible erofs image"
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# -T0 + fixed UUID => deterministic output => stable dm-verity root hash
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# for identical input trees. lz4hc: good ratio, cheap decompress; saves
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# fabric bandwidth (and MACsec cycles) on every read.
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FIXED_UUID="6c10a7f0-1d2e-4f5a-9b3c-000000000001"
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mkfs.erofs -z lz4hc -T 0 -U "$FIXED_UUID" --all-root \
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"$WORK/rootfs.erofs" "$WORK/root"
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echo "==> Appending dm-verity hash tree (single-file / single-namespace layout)"
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DATA_BYTES=$(stat -c %s "$WORK/rootfs.erofs")
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# Align hash area to 4 KiB after the data
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HASH_OFFSET=$(( (DATA_BYTES + 4095) / 4096 * 4096 ))
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VERITY_OUT=$(veritysetup format "$WORK/rootfs.erofs" "$WORK/rootfs.erofs" \
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--hash-offset="$HASH_OFFSET" \
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--data-block-size=4096 --hash-block-size=4096)
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ROOT_HASH=$(printf '%s\n' "$VERITY_OUT" | awk '/Root hash:/ {print $3}')
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[ -n "$ROOT_HASH" ] || { echo "ERROR: veritysetup produced no root hash" >&2; exit 1; }
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mv "$WORK/rootfs.erofs" "$OUT/rootfs.erofs"
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jq -n --arg hash "$ROOT_HASH" --argjson offset "$HASH_OFFSET" \
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--arg uuid "$FIXED_UUID" \
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'{root_hash: $hash, hash_offset: $offset, erofs_uuid: $uuid,
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data_block_size: 4096, hash_block_size: 4096}' \
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> "$OUT/verity.json"
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# Kernel cmdline fragment for the boot server. Single line: this file is
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# consumed verbatim by ukify in build-oci.sh and baked into the signed UKI.
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# The device node assumes the root namespace is the host's first/only
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# NVMe/TCP namespace; adjust if not. NVMET_TRADDR: set per environment
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# *before* the UKI build, since the cmdline is immutable once signed.
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DOT1X_FRAGMENT=""
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if [ "$DISABLE_DOT1X" = "true" ]; then
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echo "==> WARNING: building TEST cmdline with rd.dot1x=0 (802.1X + MACsec DISABLED)" >&2
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echo " open-port NVMe-oF boot test only — do NOT ship this UKI." >&2
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DOT1X_FRAGMENT="rd.dot1x=0 "
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fi
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printf '%s' \
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"$DOT1X_FRAGMENT" \
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"rd.neednet=1 rootovl " \
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"rd.dot1x.nvindex=0x01800001 rd.dot1x.timeout=60 " \
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"rd.nvmf.discover=tcp,NVMET_TRADDR,4420 " \
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"root=/dev/mapper/root rootfstype=erofs rootflags=ro " \
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"systemd.verity=yes roothash=${ROOT_HASH} " \
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"systemd.verity_root_data=/dev/nvme0n1 " \
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"systemd.verity_root_hash=/dev/nvme0n1 " \
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"systemd.verity_root_options=hash-offset=${HASH_OFFSET}" \
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> "$OUT/cmdline.txt"
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echo "==> Checksums"
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( cd "$OUT" && sha256sum vmlinuz initramfs.img rootfs.erofs | tee SHA256SUMS )
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cat <<EOF
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Artifacts in $OUT:
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vmlinuz, initramfs.img -> publish to the HTTPS boot server (versioned dir,
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flip a symlink for atomic rollout/rollback)
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rootfs.erofs -> expose as a READ-ONLY nvmet namespace; version
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rollout = publish new namespace, repoint hosts
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cmdline.txt -> kernel cmdline for this build. The roothash binds
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the root fs to the boot artifacts: serve via a
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signed UKI or signed GRUB config so Secure Boot
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covers it, or the verity guarantee is advisory.
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Remember: identity is NOT in these artifacts. Hosts authenticate with the
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TPM key at the fleet persistent handle and the cert in the fleet NV index;
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the hostnqn is derived from that cert at boot.
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EOF
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