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CI workflow conventions for fsdk-containers. Use when writing or editing .github/workflows/*.yml, debugging a failing build job, adding a new CI step, or checking a change against the org-wide CI job budget.
Add a component + stack element (no OCI image) composed from FSDK, e.g. a tool consumed by a future VM/appliance image. Use when the deliverable is `elements/<name>/<name>.bst` + `<name>-stack.bst` only, not a full distroless image.
Exibindo SKILL.md
| name | vm-podman-guest |
| version | 1.0 |
| last_updated | 2026-08-20T00:00:00.000Z |
| id | vm-podman-guest |
| one_line_purpose | Build, boot-test and publish the podman VM guest image. |
| entry_point | docs/skills/vm-podman-guest/SKILL.md |
| category | test-authoring |
| mcp_compliance_level | partial |
| optimization_status | draft |
| status | active |
| dependencies | [] |
| tags | ["vm","testing","podman","qemu"] |
| description | Build the lean donate-clanker raw VM disk from FSDK. |
| metadata | {"type":"runbook"} |
Use for the standalone EFI VM disk consumed by donate-clanker. The historical
podman-vm/* element names remain, but this guest is not a Podman host and is
not an OCI, QCOW2, or nspawn artifact.
vm/minimal/deps.bst → podman-vm/podman-vm-deps.bst →
podman-vm/podman-vm-filesystem.bst →
podman-vm/podman-vm-efi.bst
The base is FSDK's full VM/uutils userspace. The guest adds networking,
certificates, git, and the pinned donate-clanker worker. It deliberately has no
Podman, SSH, cloud-init, or qemu-img.
podman-vm-efi.bst stages the FSDK EFI tree and uses genimage to assemble a
raw GPT disk. Its install root contains only:
donate-clanker-vm-<fsdk-version>-<arch>.raw
donate-clanker-vm-<fsdk-version>-<arch>.raw.sha256
The raw disk is booted directly by QEMU. qemu-img is not a build or runtime
dependency of the guest itself, but CI converts the exported raw disk to
QCOW2 with qemu-img convert (just export-podman-vm-qcow2) as a second,
smaller-footprint release asset; both formats ship with their own
sha256sum --binary manifest.
A GitHub Release asset is hard-capped at 2 GiB, and the raw disk is bigger
than that (an observed aarch64 build produced a 2.3G raw). The uncompressed
disk therefore cannot be an asset: the API rejects it with
HTTP 422 ... size must be less than 2147483648. just compress-podman-vm
compresses both disks with zstd (--keep, so the real disks stay available
for the boot test, the checksum gate, and the attestations), and the
published set per architecture is exactly:
donate-clanker-vm-<fsdk-version>-<arch>.raw.zst <- the download
donate-clanker-vm-<fsdk-version>-<arch>.raw.zst.sha256 <- verifies the download
donate-clanker-vm-<fsdk-version>-<arch>.raw.sha256 <- verifies the disk after
decompression
donate-clanker-vm-<fsdk-version>-<arch>.qcow2.zst
donate-clanker-vm-<fsdk-version>-<arch>.qcow2.zst.sha256
donate-clanker-vm-<fsdk-version>-<arch>.qcow2.sha256
podman-vm-<arch>.spdx.json
The URL is predictable from the version and the architecture:
https://github.com/projectbluefin/fsdk-containers/releases/download/v<fsdk-version>/donate-clanker-vm-<fsdk-version>-<arch>.raw.zst.
This is the shape projectbluefin/donate-clanker already fetches: download
, decompress, then the sidecar. Do not
rename these assets without changing the launcher.
.raw.zstsha256sum -c.raw.sha256The FSDK EFI tree is built separately from this element's root filesystem.
podman-vm-efi.bst therefore rewrites the baked root=UUID= value from the
prepare-image.sh output before genimage -- in the UKI's .cmdline PE
section under FSDK 26.08 (objcopy --update-section, which is also where the
UKI's upstream-added quiet is removed so the serial console keeps emitting
the markers the boot test asserts on), or in each staged loader entry under
FSDK 25.08. The step fails the build when neither layout is found: a silent
no-op here is what shipped an unbootable disk when 26.08 moved the cmdline
into the UKI. Never reuse an EFI tree byte-for-byte without checking it
against the ext4 root UUID.
BST_LOCAL=1 just bst show --deps all podman-vm/podman-vm-efi.bstjust export-podman-vm checks out the raw disk and checksum manifest.just export-podman-vm-qcow2 (requires qemu-img/qemu-utils) additionally
produces the QCOW2 conversion and its own checksum manifest.tests/vm-boot.sh [disk.raw] boots the disk under plain QEMU -- see
"Boot test" below.just compress-podman-vm (requires zstd) produces the .zst release
assets and their checksum manifests, keeping the originals.just sbom podman-vm generates the SPDX SBOM for the VM guest element
(same buildstream-sbom tool as the OCI images; not part of the
elements/targets.json OCI manifest since it isn't an OCI image).96cc69f5779d63b908d5f53957287b7ef6bda7fa.references/boot-test.md — VM Podman Guest — boot test and diagnosticsreferences/bootstrap-and-ci.md — VM Podman Guest — bootstrap contract and CI