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feat: register runtime providers and introduce the Podman module - #3946
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Summary by CodeRabbit
WalkthroughThe change adds runtime-provider registration and connects selected runtime configuration to Docker endpoint discovery and client setup. It adds a Podman provider module, documentation, compatibility tests, and CI support. Provider-aware tests and changed-module detection are also updated. ChangesRuntime Provider and Podman
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Application
participant RuntimeRegistry
participant DockerProvider
participant DockerClient
participant DockerDaemon
Application->>RuntimeRegistry: select and resolve runtime
RuntimeRegistry-->>DockerProvider: return runtime configuration
DockerProvider->>DockerClient: create client using runtime endpoint
DockerClient->>DockerDaemon: connect and check daemon host
DockerDaemon-->>DockerClient: return daemon response
Suggested reviewers: Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 14.71% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 68 functions across 32 files. (1 skipped:… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Title check The title clearly and concisely summarizes the main changes: runtime-provider registration and the new Podman module. Description check The description directly explains the runtime-provider architecture, Podman module, compatibility behavior, CI changes, testing, and migration details. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 14.71% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 68 functions across 32 files. (1 skipped: 1 unsupported.)
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A rabbit checks the runtime’s name,
Then hops where Docker hosts the game.
Podman’s bridge is set in place,
Tests follow tracks at measured pace.
CI lights lanterns down the trail,
And tidy logs complete the tale.
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Actionable comments posted: 1
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @internal/core/runtime_provider.go:
- Around line 102-113: Update resolve and ExtractDockerHost so cancellation of
the first caller’s context does not permanently cache an initialization failure.
Use context.WithoutCancel for initialization or reset the cached state when the
error matches the caller’s context error, allowing a later caller to retry;
apply the same behavior to dockerHostOnce.
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⛔ Files ignored due to path filters: 1
modules/podman/go.sumis excluded by!**/*.sum
📒 Files selected for processing: 18
.github/dependabot.yml.vscode/.testcontainers-go.code-workspacedocker.godocker_client.godocs/modules/podman.mddocs/system_requirements/using_podman.mdinternal/core/client.gointernal/core/docker_host.gointernal/core/runtime_provider.gointernal/core/runtime_provider_test.gomkdocs.ymlmodules/podman/Makefilemodules/podman/go.modmodules/podman/podman.gomodules/podman/podman_test.goprovider.goruntime_provider.goruntime_provider_test.go
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Actionable comments posted: 1
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Inline comments:
Review comments at @.github/workflows/ci-test-go.yml:
- Line 118: Update the Podman diagnostics step so failures from `namei`, `sudo
podman info`, the Podman listing commands, or `journalctl` do not stop
subsequent diagnostics. Ensure all commands run so service logs are printed even
when setup leaves the socket unavailable.
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.github/scripts/setup-podman.sh.github/workflows/ci-test-go.ymldocker.goimage_test.go
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What does this PR do?
Registers Docker-compatible runtime providers before Docker host, socket, or client discovery. A selected provider initializes once per process and supplies separate client, daemon socket, published-host, and default-network settings. Unknown providers and failed managed endpoints return errors instead of falling back to host Docker.
Adds the optional
github.com/testcontainers/testcontainers-go/modules/podmanmodule. Importing it registers Podman; configuration selects it. ExistingProviderPodmancalls and automatic Podman detection retain a built-in compatibility path during migration.ProviderPodmanis deprecated, with removal deferred to a future breaking release.Adds a core-only native Podman CI job on Ubuntu 24.04 for Go 1.26 and 1.27. Core or Podman module changes select it; it exercises the imported provider, the no-import migration paths, and Ryuk cleanup of orphaned containers, networks, and volumes. It uses temporary test imports without adding the optional module to core’s dependencies, disables test retries, and checks runtime selection after each test binary. Deletions and both sides of renames now participate in module detection, and the required
endjob verifies all expected jobs completed.Native testing also fixes default-network discovery when Podman lists its native network under the Docker
bridgealias. Provider-independent health and integration checks now honor the configured runtime. Tests account for Podman’s inspect formatting and documented API limitations.Why is it important?
Runtime selection must happen before clients and Ryuk can be initialized, including through direct client constructors. An optional Go module can now prepare a runtime without adding its implementation dependencies to the core library. Containers continue to use the existing Docker-compatible implementation.
Related issues
How to test this PR
CGO_ENABLED=1 go test -race -count=1 ./internal/core ./internal/configCGO_ENABLED=1 go test -race -count=1 -run '^(TestProviderType|TestDockerClient|TestNewDockerClient|TestDockerProvider|TestDockerContainer)' .CGO_ENABLED=1 go test -race -count=1 -run '^TestRuntimeProviderClient$' .modules/podman:CGO_ENABLED=1 go test -race ./...modulegen:make generate,go run . refresh, andmake tidyleave no additional changes; the refresh, Dependabot entry, and docs navigation tests pass.Tests cover concurrent initialization, cancellation of individual callers without poisoning shared startup or discovery caches, cached initialization failures, missing registrations, explicit-selection precedence, early host/socket/client discovery, managed endpoint isolation from host TLS settings, and prevention of fallback to host Docker. Native Podman 4.9.3 passed the automatic and explicit no-import compatibility smoke tests and orphan cleanup. Native Podman 5.7 passed the targeted imported-provider networking, published-port, resource-limit, capability, provider-selection, and Ryuk tests. The complete core suite runs in the new GitHub CI job; local arm64 runs cannot execute the existing amd64-only authentication fixtures.
./.github/scripts/test-core-podman.sh.Follow-ups
After this PR merges, a separate PR against
mainwill add an sbx provider using this interface and route Compose's additional clients to managed endpoints. The built-in Podman compatibility path remains until a separately announced breaking release.