PR #515 stopped bot-bottle from *creating* a gateway network with a
malformed IPv6 subnet (--ipv6=false), but it can't recover a network that
is *already* poisoned. On a daemon that default-enables IPv6, the fixed-name
`bot-bottle-gateway` network gets an `fdd0::/64` subnet whose `::1/64`
gateway trips docker's own netip.ParseAddr, so `docker network inspect`/`ls`
exit non-zero — poisoning every command that reads networks.
Such a network can survive on a shared runner from a pre-fix or concurrent
launch. `_ensure_network` never healed it: its migrate/recreate branch only
ran when `network inspect` *succeeded*, but a poisoned network makes inspect
*fail*, so the code fell through to `network create`, which no-ops on
"already exists" — leaving the poison in place. The next subnet read then
failed with ConsolidatedLaunchError (test_multitenant_isolation), and a bare
`docker network ls` failed too (test_orphan_cleanup).
Fix, two parts:
- gateway.py: when `network inspect` fails for a reason other than "no such
network", treat the network as poisoned and force-remove + recreate it
IPv4-only. Absent-vs-poisoned is distinguished by the inspect stderr.
- test.yml: add an integration-docker preflight that drops the leftover
gateway network (and its container) before the suite, so direct `network
ls`/`inspect` calls in tests are clean even on a daemon where the in-code
heal can't run because inspect itself is what's broken.
Adds unit coverage for the poisoned-heal and the absent-create split.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
didericis-claude
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