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nix: re-run the host's store fetches on a ten-minute timer

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Seven host oneshots fetch a secret from the swarm secret store into a file
their consumer loads at start: swarm-bao-grafana-oidc, swarm-bao-otel-oidc,
swarm-bao-matrix-oidc, swarm-bao-ci-runner, swarm-bao-forge-oidc,
swarm-bao-hive-otel-oidc and swarm-bao-forwarder-oidc. Each was
RemainAfterExit with no timer, so it ran at boot or deploy and never again:
a secret re-minted in the store reached its consumer only through an
operator restarting the fetch.

lib/store-refresh-timer.nix gives each one a timer (OnUnitInactiveSec 10min,
RandomizedDelaySec 1min, the agent's own store re-read interval), and each
drops RemainAfterExit so a timer start is not a no-op. Each script already
writes the file only when secret_differs, and refresh_consumer/refresh_unit
restart the consumer only when the file is newer than its last start, so a
run reading an unchanged value restarts nothing.

Two docs said these units do not run on a timer; credentials.md's
ci-runner row said the runner token is not re-pulled.

Part of #5017 (slice T).
This commit is contained in:
atlas 2026-10-12 20:21:17 +02:00 • committed by mara
commit 2f05e2db28
12 changed files with 146 additions and 13 deletions
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27
nix/host-modules/lib/store-refresh-timer.nix Normal file
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# Timer for a host oneshot that fetches a credential from the swarm secret
# store: it starts the oneshot again 10 minutes after each run, so a value
# re-minted in the store lands on the host and restarts its consumer with no
# operator step. Ten minutes matches the agent's own store re-read
# (../../agent-modules/bao.nix).
#
# ⚠️ The oneshot must not be `RemainAfterExit`: starting a unit that stays
# `active (exited)` is a no-op, so the timer would fire and fetch nothing.
# A run that reads an unchanged value writes nothing and restarts nothing —
# its `secret_differs` gate and ./refresh-consumer.nix see to that.
#
# Gate the timer exactly as its service is gated: a timer whose unit does
# not exist fails to load.
#
# Pure function — NOT a NixOS module. Call it from a module's `let`:
#
# storeRefreshTimer = import ./lib/store-refresh-timer.nix { };
# systemd.timers.swarm-bao-foo = storeRefreshTimer "re-read foo's secret from the swarm secret store";
{ }:
description: {
inherit description;
wantedBy = [ "timers.target" ];
timerConfig = {
OnUnitInactiveSec = "10min";
RandomizedDelaySec = "1min";
};
}