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fix(retag): block retags that would stop WUDup or its Docker endpoint - #889
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When DOCKER_HOST points at a network endpoint such as a socket proxy, the self-protection preflight now inspects the running containers in each stack's recreate scope and blocks the stack (docker-endpoint-recreate-blocked) if one of them serves that endpoint. Stopping it would cut WUDup off from Docker so it could not finish or roll back. Lookup failures fail closed; unix-socket DOCKER_HOST is unaffected and WUD itself stays updatable.
Retag apply now checks every selected stack before any Compose rewrite, pull, stop, or recreate, and fails closed when the retagged services include WUDup (by image or WUD_WEB_RESTART_CONTAINER identity) or the container serving WUDup's network DOCKER_HOST. It reuses the pending-update preflight helpers and messages. Refs #887
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| Check name | Status | Explanation |
|---|---|---|
| Linked Issues check |  |
Issue #887 requires a fail-closed preflight before any retag Compose rewrite, pull, stop, or recreate. The reviewed code calls validate_retag_recreate_scope for every selected stack before the mutatio… |
| Out of Scope Changes check | |
The changes stay within issue #887. The updater_preflight helper change supports reuse of Docker endpoint inspection. The retag tests, WebUI documentation, and AGENTS ownership update support the guar… |
| Title check | |
Clear and specific, the title matches the main change: blocking retags that could stop WUDup or its Docker endpoint. |
| Description check | |
Complete and well-structured, the description includes the objective, implementation details, scope, checklist, test results, limitations, and deferred work. |
Full details: Linked Issues check
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Explanation
Issue
#887requires a fail-closed preflight before any retag Compose rewrite, pull, stop, or recreate. The reviewed code calls validate_retag_recreate_scope for every selected stack before the mutation loop. The guard checks WUDup image identity, WUD_WEB_RESTART_CONTAINER identity, and the Docker endpoint container. It reuses the pending-update guidance and records blocked scopes as preflight failures with stack and service data. The tests cover blocked scopes, fail-closed inspection, Unix-socket handling, and checking all stacks before mutation.
Full details: Out of Scope Changes check
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Explanation
The changes stay within issue
#887. The updater_preflight helper change supports reuse of Docker endpoint inspection. The retag tests, WebUI documentation, and AGENTS ownership update support the guard and its behavior. No unrelated implementation change is shown.
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Reviewer's GuideRetag apply now performs a shared, fail-closed preflight across every selected stack before mutation, preventing retags that would recreate WUDup itself or the container providing its TCP Docker endpoint while preserving safe handling for Unix-socket or unset Docker hosts. File-Level Changes
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A retag blocked by the recreate-scope guard now reports a preflight-phase failure event naming the blocked stack and services, since nothing was attempted. Adds an end-to-end retag apply test with a unix-socket DOCKER_HOST and a configured WUDup restart container.
Retag apply now checks every selected stack before any Compose rewrite, pull, stop, or recreate, and fails closed when the retagged services include WUDup (by image or WUD_WEB_RESTART_CONTAINER identity) or the container serving WUDup's network DOCKER_HOST. It reuses the pending-update preflight helpers and messages. Refs #887
A retag blocked by the recreate-scope guard now reports a preflight-phase failure event naming the blocked stack and services, since nothing was attempted. Adds an end-to-end retag apply test with a unix-socket DOCKER_HOST and a configured WUDup restart container.
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Address SonarCloud findings on the retag scope guard: split validate_retag_recreate_scope and the retag failure progress event into small helpers to reduce cognitive complexity, and keep each pytest.raises block to a single call. Behavior is unchanged.
…ix/retag-endpoint-guard # Conflicts: # src/wudup/web_retag_apply.py # src/wudup/web_retag_scope.py # tests/test_python_web_retag_apply_scope.py
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Review comments at @src/wudup/web_retag_scope.py:
- Around line 45-46: Update the retag scope logic around `services` and `scoped`
to account for containers that `--remove-orphans` could remove, including
containers serving `DOCKER_HOST` or running WUDup; alternatively, disable orphan
removal for retags. Fail closed before rewriting any stack if a protected
container is at risk.
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📒 Files selected for processing: 7
docs/wiki/webui-container.mdsrc/wudup/AGENTS.mdsrc/wudup/updater_preflight.pysrc/wudup/web_retag_apply.pysrc/wudup/web_retag_scope.pytests/test_python_web_retag_apply_scope.pytests/web_retag_test_helpers.py
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Retag apply passed --remove-orphans whenever the Compose project was not shared, so an orphaned WUDup or socket-proxy container left running after its service was removed from the Compose file could be deleted, cutting WUDup off from Docker. Retag never removes services, so it has no orphans of its own to clean up: drop orphan removal from retag recreate and rollback. The recreate-scope guard's scope is now exactly the retagged services. Refs #887, #891
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# Conflicts: # docs/wiki/webui-container.md # src/wudup/updater_preflight.py
The merge-base changed after approval.
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Summary
Fixes #887. The WebUI retag apply path stops or pauses and recreates the selected Compose services with no self-protection, so a retag of the socket proxy behind
DOCKER_HOST=tcp://socket-proxy:2375cuts WUDup off from Docker. Once that happens, health checks, recovery, and rollback all fail, which is the same failure as the production incident on the pending-update path that #888 guards. This PR adds the same guard to retag apply, built on #888's helpers.src/wudup/web_retag_scope.py:validate_retag_recreate_scopechecks each stack's retagged services (retag recreates with--no-deps, so the scope is exactly those services). It blocks a retag when:is_self_update_target)WUD_WEB_RESTART_CONTAINERcontainerDOCKER_HOSThost (docker_endpoint_host,DockerCli.container_dns_details,container_dns_names)compose ps, or the container inspect cannot be read. A unix-socket or unsetDOCKER_HOSTskips the endpoint check.web_retag_apply._apply_retag_updatesruns the guard for every selected stack before the first Compose rewrite, pull, stop, or recreate. If any stack is blocked, no stack is changed. The failure is recorded on the job and in theweb-retagaudit run. It is reported as a preflight failure event that names the blocked stack and services, because nothing was attempted._SELF_UPDATE_MESSAGE,_DOCKER_ENDPOINT_LOOKUP_MESSAGE,_docker_endpoint_message)._docker_endpoint_servicesnow takes aDockerCliinstead of the runner so both paths can share it.--remove-orphans. Retag never removes services, so it has no orphans of its own, and the flag only acted when orphans existed. It could delete an orphaned WUDup or socket-proxy container that the guard does not see. The guard's scope is now exactly the retagged services. The pending-update path keeps orphan removal; that is tracked in Pending updates: Compose --remove-orphans can remove WUDup or its Docker endpoint proxy #891.docs/wiki/webui-container.md, plus the ownership row insrc/wudup/AGENTS.md.Scope
claude/recursing-taussig-50dde9). Retarget tomainafter fix(updater): block updates that would stop WUDup's Docker endpoint #888 merges; most CI only runs for PRs targetingmain. The endpoint check has the same limits that fix(updater): block updates that would stop WUDup's Docker endpoint #888 documents: it does not detect a published host port, anetwork_modeproxy, or a Docker context.Checklist
README.mdordocs/updated if install, deployment, config, or user-facing behavior changeddocs/examples/template.envordocs/examples/webui.env.exampleupdated if environment variables or example config changed: N/A, no new variablesCHANGELOG.mdedit needed outside release prepTest plan
tests/run-all.sh: N/A, ran the Python subset belowtests/run-all.sh --python(2201 passed, 1 skipped) andruff check .tests/test_python_web_retag_apply_scope.py: blocked when the endpoint proxy is in scope, blocked for WUDup by container identity and by image, unix-socketDOCKER_HOSTskips the endpoint inspect (unit test, plus a full retag apply with a restart container set), inspect failure fails closed, identity lookup failure fails closed, and every stack is checked before any mutation. The three end-to-end guard tests fail when the guard is stubbed out, and also fail without the preflight-phase reporting.tests/test_python_web_retag*.py: the existing retag tests still pass with the guard active.