feat!: remove checkpoint/restore and the Podman backend - #124
Conversation
Checkpoint/restore only ever worked on Podman — docker's restore is
broken upstream on containerd-integrated engines (moby#37344), which is
why the primitive landed in a Podman backend in the first place. With
Docker the only supported backend, the feature has no implementation, so
both it and the backend that carried it go.
Removed from the public API:
runtime.CheckpointRuntime, CheckpointSpec, RestoreSpec, CheckpointRef
runtime.ErrCheckpointUnsupported, CheckpointFailedError,
RestoreFailedError
runtime.Capabilities.Checkpoint
Engine.Checkpoint / Restore / CheckpointProject / RestoreProject
ProjectCheckpointOptions, ProjectRestoreOptions, ProjectCheckpointRef,
ServiceCheckpoint
Also removes the compose orchestrator's self-probed health path. The
selfHealthProber opt-in (PreferSelfProbedHealth) existed solely because
Podman runs a container's HEALTHCHECK eagerly as root and races
privilege-dropping images; runtime/podman was its only implementor, so
with it gone selfProbe was permanently false and the whole branch —
probeHealthy, healthProbeCmd, the native-healthcheck disable in
ensureService, and waitFor's hc parameter — was unreachable. Health
gating now always reads native health status, which is what Docker and
Apple already did.
Design records for the removed subsystems (checkpoint-restore.md,
podman-backend.md, compose-native-health.md) are deleted rather than
left asserting a backend that no longer exists, and .dap/review/
engineering.md no longer describes a podman backend or cites the
health-probing opt-in as the example capability probe.
go.mod is unchanged: the backend used only existing dependencies.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe change removes checkpoint/restore APIs, the Podman runtime backend, and Podman-specific health probing. Compose health gating now uses native container inspection. Documentation and engineering guidance reflect the supported Docker and Apple Container backends. ChangesRuntime surface removal
Native health gating
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🔵 Low · up to The change removes the Podman backend and checkpoint/restore APIs, but a few Podman references remain in documentation and comments. This is a bounded documentation inconsistency with no indicated runtime impact; the PR is mergeable with owner awareness or a small cleanup follow-up. Poem
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 3 files. (2 skipped: 2 unsupported.) ✨ Finishing Touches📝 Generate docstrings
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Inline comments:
In `@runtime/doc.go`:
- Line 7: Complete the Podman documentation removal by updating the runtime
references in structured-errors.md and runtime.go: replace runtime/podman/ and
docker/podman HostConfig terminology with valid backend terminology, or remove
those references where no longer applicable.
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Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
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Configuration used: Organization UI
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📒 Files selected for processing (26)
.dap/review/engineering.mdCHANGELOG.mdattach.gocheckpoint.gocheckpoint_project.gocheckpoint_project_test.gocheckpoint_test.gocompose/orchestrator.gocompose/orchestrator_health_test.godesign/README.mddesign/checkpoint-restore.mddesign/compose-native-health.mddesign/podman-backend.mdruntime/compose_primitives.goruntime/doc.goruntime/errors.goruntime/podman/build.goruntime/podman/checkpoint.goruntime/podman/integration_test.goruntime/podman/libpod.goruntime/podman/podman.goruntime/podman/podman_test.goruntime/runtime.gotest/integration/podman_checkpoint_restore_test.gotest/integration/podman_crossnode_test.gotest/integration/podman_project_checkpoint_test.go
💤 Files with no reviewable changes (21)
- runtime/podman/integration_test.go
- design/checkpoint-restore.md
- runtime/errors.go
- design/podman-backend.md
- checkpoint_project.go
- design/README.md
- test/integration/podman_project_checkpoint_test.go
- runtime/podman/build.go
- compose/orchestrator_health_test.go
- runtime/compose_primitives.go
- checkpoint.go
- runtime/podman/libpod.go
- test/integration/podman_crossnode_test.go
- runtime/runtime.go
- runtime/podman/podman.go
- design/compose-native-health.md
- test/integration/podman_checkpoint_restore_test.go
- runtime/podman/checkpoint.go
- checkpoint_test.go
- runtime/podman/podman_test.go
- checkpoint_project_test.go
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Code Review — head a6f5b1a
Reviewed head a6f5b1a (one commit, 26 files, 3,729 deletions/69 additions) after checking it out and comparing with base 6eabcf4. Covered the removed checkpoint/restore API and Podman backend, all remaining runtime references and backend dispatch, compose orchestrator health-path changes, release/design documentation, and caller/reference searches. The repository directive file itself is modified by the PR; I applied the base version as required and found the edits factual rather than a relaxation of review scope. Static source inspection only; I did not execute the code or tests. The directive-referenced PRD.md was absent at the base SHA, so PRD-specific checks were not possible. Replies typed into inline comment threads will not reach this review; respond in the pull request conversation if clarification is needed.
Commented inline
- [LOW] [D11] The new changelog says Docker is the only supported backend even though Apple remains supported —
CHANGELOG.md:15 - [LOW] [D11] Deleting the health design record leaves the shipped 0.4.0 changelog link dead —
design/compose-native-health.md:1
Verdict
ADVISORY — findings worth reading, none of them blocking.
| @@ -1,166 +0,0 @@ | |||
| # Design — Orchestrator-driven health probing (Podman) | |||
There was a problem hiding this comment.
[LOW] [D11] Deleting the health design record leaves the shipped 0.4.0 changelog link dead
- Witness: Command:
git grep -n -E 'checkpoint-restore\.md|podman-backend\.md|compose-native-health\.md' HEAD -- '*.md'
Raw output:HEAD:CHANGELOG.md:118: \design/compose-native-health.md`. (Podman: fix compose-devcontainer health + multi-service checkpoint/restore #102). The change deletesdesign/compose-native-health.md`, so the historical 0.4.0 entry still presents a repository-relative link to a file that no longer exists. - Consumer: A contributor or user following the historical health-probing entry at
CHANGELOG.md:110-119gets a 404/missing-file result and cannot inspect the rationale for the behavior being removed. - Fix: Keep a short archived record at
design/compose-native-health.md(or redirect it to an existing historical document), or update the historical entry to a stable external/archive location before deleting the file.
Addresses review feedback on the removal: - CHANGELOG said "with Docker the only supported backend" while applecontainer is still selectable (cmd/devcontainer/root.go:36,95) and implemented. Reworded to the accurate reason: neither remaining backend can checkpoint — docker's restore is broken upstream, apple has no CRIU — so with Podman gone the feature has no implementation. - Deleting design/compose-native-health.md left the shipped 0.4.0 entry naming a file that is no longer in the tree. Rather than rewrite a released entry or keep an archived stub for a removed feature, the Unreleased entry now names the three deleted records and points at tag v0.4.3, where they remain readable. - runtime/runtime.go: Details security-options doc said the values are read back from "docker/podman HostConfig"; podman is gone. - design/structured-errors.md: the "when a new runtime backend lands" example pointed at runtime/podman/, a directory this PR deletes, so a reader would go looking for it. Uses runtime/k8s/ instead, matching how runtime/doc.go phrases the same idea. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Both findings taken — fixed in e741187, along with two from CodeRabbit. [D11] CHANGELOG claims Docker is the only supported backend. Correct, and it was my error.
[D11] Deleting the health design record leaves the 0.4.0 entry naming a missing file. Also correct. I took neither of your two suggested fixes, for these reasons:
Instead the
I verified If you consider the dangling reference still open after that, I'd rather leave the finding standing than reintroduce a stub. Two from CodeRabbit, both genuine leftovers of this deletion:
The second is narrower than the position I took in the PR description about illustrative mentions in design records. That argument was about not being obliged to rewrite records wholesale; refreshing a one-word example that now points into a hole is cheaper than defending it. The two remaining "a future backend could be podman" mentions in
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Code Review — head e741187
Re-reviewed synchronized head e741187 after fetching and checking out the PR. The new commit changes documentation only; the prior backend-claim finding was verified fixed and resolved. Rechecked the full two-commit scope (27 files, 3,731 net deletions/additions as reported by git), deleted subsystem references, remaining backend dispatch, runtime API surface, compose health behavior, and base directives. One documentation issue remains open. Static inspection only; no code or tests were executed. The base-referenced PRD.md remains absent, so PRD-specific validation was not possible. Replies in inline comment threads will not reach this review; use the pull request conversation for responses.
Commented inline
- [LOW] [D11] Deleting the health design record leaves the shipped 0.4.0 changelog link dead —
design/compose-native-health.md:1 - [LOW] [D11] The cleanup note incorrectly claims the 0.4.1 changelog entry names the deleted design records —
CHANGELOG.md:41
Verdict
ADVISORY — findings worth reading, none of them blocking.
| @@ -1,166 +0,0 @@ | |||
| # Design — Orchestrator-driven health probing (Podman) | |||
There was a problem hiding this comment.
[LOW] [D11] Deleting the health design record leaves the shipped 0.4.0 changelog link dead
- Witness: Command:
git grep -n -E 'checkpoint-restore\.md|podman-backend\.md|compose-native-health\.md' HEAD -- '*.md'
Raw output:HEAD:CHANGELOG.md:118: \design/compose-native-health.md`. (Podman: fix compose-devcontainer health + multi-service checkpoint/restore #102). The change deletesdesign/compose-native-health.md`, so the historical 0.4.0 entry still presents a repository-relative link to a file that no longer exists. - Consumer: A contributor or user following the historical health-probing entry at
CHANGELOG.md:110-119gets a 404/missing-file result and cannot inspect the rationale for the behavior being removed. - Fix: Keep a short archived record at
design/compose-native-health.md(or redirect it to an existing historical document), or update the historical entry to a stable external/archive location before deleting the file.
The cleanup note claimed the 0.4.0 and 0.4.1 entries both name the deleted design records. Only the 0.4.0 entry does (CHANGELOG.md:126, naming design/compose-native-health.md); the 0.4.1 section contains no such reference. Names the actual entry and file instead. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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[D11 / finding 11] The cleanup note misstates which entry names the deleted records — correct, fixed in 8317463. You're right and I should have checked before writing it.
That is also narrower in the right direction: only one of the three deleted records is referenced from a released entry at all. [D11 / finding 10] The dangling 0.4.0 reference — I'm leaving this one standing. I gave my reasoning in the previous comment and I don't want to trade rounds on a LOW advisory. In short: an archived stub at If you still disagree after that, the finding can stand; it's advisory, I've considered it, and I'd rather it stay open and visible than paper over it with a stub. Nothing further from me on it.
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Code Review — head 8317463
Re-reviewed synchronized head 8317463. The latest commit only corrects the prior changelog wording; that carried finding was verified fixed and resolved. The remaining carried documentation finding is still open because CHANGELOG.md:127 continues to link to deleted design/compose-native-health.md. This branch has exhausted its three review runs; no further automated DAP review runs are available, so a human should review any subsequent changes. Static inspection only; no code or tests were executed.
Commented inline
- [LOW] [D11] Deleting the health design record leaves the shipped 0.4.0 changelog link dead —
design/compose-native-health.md:1
Verdict
ADVISORY — findings worth reading, none of them blocking.
| @@ -1,166 +0,0 @@ | |||
| # Design — Orchestrator-driven health probing (Podman) | |||
There was a problem hiding this comment.
[LOW] [D11] Deleting the health design record leaves the shipped 0.4.0 changelog link dead
- Witness: Command:
git grep -n -E 'checkpoint-restore\.md|podman-backend\.md|compose-native-health\.md' HEAD -- '*.md'
Raw output:HEAD:CHANGELOG.md:118: \design/compose-native-health.md`. (Podman: fix compose-devcontainer health + multi-service checkpoint/restore #102). The change deletesdesign/compose-native-health.md`, so the historical 0.4.0 entry still presents a repository-relative link to a file that no longer exists. - Consumer: A contributor or user following the historical health-probing entry at
CHANGELOG.md:110-119gets a 404/missing-file result and cannot inspect the rationale for the behavior being removed. - Fix: Keep a short archived record at
design/compose-native-health.md(or redirect it to an existing historical document), or update the historical entry to a stable external/archive location before deleting the file.
1 participant
Fourth step in retiring the non-Docker backends, after #121, #122 and #123. 3,729 deletions, 69 insertions. Breaking, hence
feat!.Why these go together
Checkpoint/restore only ever worked on Podman — docker's restore is broken upstream on containerd-integrated engines (moby#37344), which is exactly why the primitive landed in a Podman backend rather than in
runtime/docker.runtime/podmanreached Podman through the docker-compatible socket purely so it could add CRIU checkpoint/restore via libpod; nothing else depended on it. With Docker the only supported backend, the feature has no implementation and the backend has no remaining purpose.Removed public API — breaking
There was never a
devcontainer checkpointCLI command — this was a library-only API, so the CLI surface is unchanged.Third-order removal, flagging explicitly
Removing
runtime/podmanalso killed the compose orchestrator's self-probed health path, and I folded that in rather than leaving it behind.selfHealthProber(PreferSelfProbedHealth() bool) was an opt-in that existed solely because Podman runs a container'sHEALTHCHECKeagerly as root, which races privilege-dropping images.runtime/podman.Runtimewas its only implementor — Docker and Apple deliberately never opted in. With it gone,o.selfProbeis permanentlyfalse, so the entire branch was unreachable:probeHealthy,healthProbeCmd, the native-healthcheckDisableinensureService,waitFor'shcparameter, and thehealthCheckOflookup that fed it.Health gating now always reads the backend's native health status — which is what Docker and Apple already did on every code path. No behavior change for any surviving backend. The
waitForbody is preserved verbatim, just unindented a level now that the branch is gone.compose/orchestrator_health_test.go(139 lines) tested only this path and goes with it;healthCheckOfstays, still used byserviceToRunSpecon the native path.Note
selfHealthProberwas unexported, so this isn't a public API break — but a third-party backend could satisfy it structurally, which is why I'm calling it out rather than burying it.Docs
design/checkpoint-restore.md,design/podman-backend.mdanddesign/compose-native-health.mdare deleted with their subsystems, and the first two rows drop out of thedesign/README.mdtable..dap/review/engineering.mdno longer tells the reviewer there is a podman backend, and its "legitimate way to encode divergence" example moves from the now-deleted health-probing opt-in to aCapabilities()flag.Historical CHANGELOG entries for 0.4.0/0.4.1 are left untouched — they record what shipped in those releases. The removal is recorded under
## [Unreleased].Three illustrative "a future backend could be podman" mentions remain in
design/structured-errors.mdanddesign/compose-native.md. They describe hypothetical backends rather than current code, anddesign/README.md:11-16states records are not kept in sync withmain.Verification
go build ./...,go vet ./...,go vet -tags=integration ./...,go test -race -count=1 ./...(all packages pass),gofmt -lclean,make lint→ 0 issues.go.mod/go.sumunchanged — the backend used only existing dependencies.What's left after this
runtime/applecontainer/(3,660 LOC),applecontainer-bridge/(2,228), the 8test/integration/applecontainer_*tests, the--runtime applecontainerdispatch incmd/devcontainer/root.go, the Swift bridge targets in theMakefile,design/runtime-applecontainer.md, and the Apple capability prose inruntime/compose_primitives.go.Summary by CodeRabbit
Breaking Changes
Bug Fixes