The previous commit's comments said a unit in auto-restart keeps its
start job, so anything ordered after it waits for the whole 24h retry
window. That is wrong under the default RestartMode=normal: each failed
attempt passes through `failed`, which ends that start job. `After=`
dependents proceed after one attempt, `Requires=` dependents fail with
`dependency`, and the retries continue as fresh start jobs. The
2026-09-24 journal shows it with the already-2880 swarm-services-cert:
nginx got "Dependency failed" 1ms after the first failure, and
switch-to-configuration exited before the first restart was scheduled.
The comments in lib/store-retry.nix, glue-matrix-bao-token.nix,
glue-queue-agent-credential.nix, swarm-otel.nix and swarm-grafana.nix
now say that, and so does docs/swarm/credentials.md.
Because dependents start after one attempt, a consumer that loads its
credential at start never sees a value a later attempt lands, or a
rotated one. nix/host-modules/lib/refresh-consumer.nix adds
`secret_differs` and `refresh_consumer`, and the four fetch units whose
consumers take a start-time copy call them after the write, only when
the value changed:
- swarm-bao-matrix-token -> tuwunel.service in hive-matrix
- swarm-bao-otel-oidc -> opentelemetry-collector.service in swarm-otel
- swarm-bao-grafana-oidc -> grafana.service in the grafana container
- swarm-bao-forwarder-oidc -> opentelemetry-collector.service in swarm-bao
A running consumer is try-restarted, a failed one is reset and started,
all with --no-block. Inline in the fetch script rather than a
PathChanged path unit because the fetch script is the only writer and
already knows whether the value changed, and it is the same shape as
this PR's nginx hook and swarm-bao-nats-tls's restart of nats.
module-eval-bao-grants gains one case per consumer.
Refs #4662
Six credential-fetch units retried 4 times at 15s, so an apply during
which the store or gateway was down for more than about a minute left
them in start-limit-hit, and nothing started them again once the store
came back. The swarm-services leaf could also land after nginx had
already given up on it, and the hook that propagates a new leaf only
reloaded a running nginx, so a stopped one stayed down until a second
apply.
- nix/host-modules/lib/store-retry.nix: the 2880 x 30s / 25h window
shape swarm-services-cert already had, as one attrset.
- swarm-services-cert, swarm-bao-otel-oidc, swarm-bao-forwarder-oidc,
swarm-bao-matrix-token, swarm-bao-queue-agent, swarm-bao-grafana-oidc,
hive-agent-bao-identity and hive-agent-forge-token use it.
queue-identity.nix no longer has a fetch unit (ccb5bd3b), and
forge-token.nix is a fetch unit with the same short budget that was
added after the census in #4662.
- The swarm-services-cert propagation hook now reset-fails and starts
(--no-block) a loaded nginx that is not active; an active nginx keeps
the re-import + reload.
- module-eval-bao-grants: one case pinning the shape on every host-side
fetch unit, swarm-services-cert included.
Refs #4662
